Order this document by MRF1511/D SEMICONDUCTOR TECHNICAL DATA The RF MOSFET Line N–Channel Enhancement–Mode Lateral MOSFET The MRF1511T1 is designed for broadband commercial and industrial applications at frequencies to 175 MHz. The high gain and broadband performance of this device makes it ideal for large–signal, common source amplifier applications in 7.5 volt portable FM equipment. • Specified Performance @ 175 MHz, 7.5 Volts Output Power — 8 Watts Power Gain — 11.5 dB Efficiency — 55% • Capable of Handling 20:1 VSWR, @ 9.5 Vdc, 175 MHz, 2 dB Overdrive • Excellent Thermal Stability • Characterized with Series Equivalent Large–Signal Impedance Parameters • Broadband UHF/VHF Demonstration Amplifier Information Available Upon Request • RF Power Plastic Surface Mount Package • Available in Tape and Reel. T1 Suffix = 1,000 Units per 12 mm, 7 Inch Reel. 175 MHz, 8 W, 7.5 V LATERAL N–CHANNEL BROADBAND RF POWER MOSFET CASE 466–02, STYLE 1 (PLD–1.5) PLASTIC MAXIMUM RATINGS Rating Symbol Value Unit Drain–Source Voltage VDSS 40 Vdc Gate–Source Voltage VGS ±20 Vdc Drain Current — Continuous ID 4 Adc Total Device Dissipation @ TC = 25°C (1) Derate above 25°C PD 62.5 0.5 Watts W/°C Storage Temperature Range Tstg –65 to +150 °C Operating Junction Temperature TJ 150 °C Symbol Max Unit RθJC 2 °C/W THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Case (1) Calculated based on the formula PD = TJ – TC RθJC NOTE – CAUTION – MOS devices are susceptible to damage from electrostatic charge. Reasonable precautions in handling and packaging MOS devices should be observed. REV 1 MOTOROLA RF DEVICE DATA Motorola, Inc. 2002 MRF1511T1 1 ELECTRICAL CHARACTERISTICS (TC = 25°C unless otherwise noted) Characteristic Symbol Min Typ Max Unit Zero Gate Voltage Drain Current (VDS = 35 Vdc, VGS = 0) IDSS — — 1 µAdc Gate–Source Leakage Current (VGS = 10 Vdc, VDS = 0) IGSS — — 1 µAdc Gate Threshold Voltage (VDS = 7.5 Vdc, ID = 170 µA) VGS(th) 1.0 1.6 2.1 Vdc Drain–Source On–Voltage (VGS = 10 Vdc, ID = 1 Adc) VDS(on) — 0.4 — Vdc Input Capacitance (VDS = 7.5 Vdc, VGS = 0, f = 1 MHz) Ciss — 100 — pF Output Capacitance (VDS = 7.5 Vdc, VGS = 0, f = 1 MHz) Coss — 53 — pF Reverse Transfer Capacitance (VDS = 7.5 Vdc, VGS = 0, f = 1 MHz) Crss — 8 — pF Common–Source Amplifier Power Gain (VDD = 7.5 Vdc, Pout = 8 Watts, IDQ = 150 mA, f = 175 MHz) Gps 10 11.5 — dB Drain Efficiency (VDD = 7.5 Vdc, Pout = 8 Watts, IDQ = 150 mA, f = 175 MHz) η 50 55 — % OFF CHARACTERISTICS ON CHARACTERISTICS DYNAMIC CHARACTERISTICS FUNCTIONAL TESTS (In Motorola Test Fixture) MRF1511T1 2 MOTOROLA RF DEVICE DATA 15 Ω, 0805 Chip Resistor 1.0 kΩ, 1/8 W Resistor 1.0 kΩ, 0805 Chip Resistor 33 kΩ, 1/8 W Resistor 0.200″ x 0.080″ Microstrip 0.755″ x 0.080″ Microstrip 0.300″ x 0.080″ Microstrip 0.065″ x 0.080″ Microstrip 0.260″ x 0.223″ Microstrip 0.095″ x 0.080″ Microstrip 0.418″ x 0.080″ Microstrip 1.057″ x 0.080″ Microstrip 0.120″ x 0.080″ Microstrip Glass Teflon, 31 mils, 2 oz. Copper R1 R2 R3 R4 Z1 Z2 Z3 Z4 Z5, Z6 Z7 Z8 Z9 Z10 Board B1, B2 Short Ferrite Bead, Fair Rite Products (2743021446) C1, C5, C18 120 pF, 100 mil Chip Capacitor C2, C10, C12 0 to 20 pF, Trimmer Capacitor C3 33 pF, 100 mil Chip Capacitor C4 68 pF, 100 mil Chip Capacitor C6, C15 10 µF, 50 V Electrolytic Capacitor C7, C16 1,200 pF, 100 mil Chip Capacitor C8, C17 0.1 µF, 100 mil Chip Capacitor C9 150 pF, 100 mil Chip Capacitor C11 43 pF, 100 mil Chip Capacitor C13 24 pF, 100 mil Chip Capacitor C14 300 pF, 100 mil Chip Capacitor L1, L3 12.5 nH, A04T, Coilcraft L2 26 nH, 4 Turn, Coilcraft L4 55.5 nH, 5 Turn, Coilcraft N1, N2 Type N Flange Mount Figure 1. 135 – 175 MHz Broadband Test Circuit TYPICAL CHARACTERISTICS, 135 – 175 MHz + / . #))%))&*( !" #))$%)&$'( + + + / . . . . . . ,-# $% &$'( . Figure 2. Output Power versus Input Power MOTOROLA RF DEVICE DATA . + !"# $% &$'( Figure 3. Input Return Loss versus Output Power MRF1511T1 3 TYPICAL CHARACTERISTICS, 135 – 175 MHz %00#)')%%1)&2( ')&*( !"# $% &$'( Figure 4. Gain versus Output Power / . !"# $% &$'( %00#)')%%1)&2( / . ,- / *4 3# ' % &4'( / . ,- / *4 Figure 6. Output Power versus Biasing Current 3# ' % &4'( %00#)')%%1)&2( 3 / 4' ,- / *4 Figure 7. Drain Efficiency versus Biasing Current !" #))$%)&$'( Figure 5. Drain Efficiency versus Output Power !" #))$%)&$'( / . # 1 '% &( Figure 8. Output Power versus Supply Voltage MRF1511T1 4 3 / 4' ,- / *4 # 1 '% &( Figure 9. Drain Efficiency versus Supply Voltage MOTOROLA RF DEVICE DATA B1, B2 N1, N2 R1 R2 R3 R4 Z1 Z2 Z3 Z4 Z5, Z6 Z7 Z8 Z9 Z10 Board Short Ferrite Bead, Fair Rite Products (2743021446) 330 pF, 100 mil Chip Capacitor 43 pF, 100 mil Chip Capacitor 0 to 20 pF, Trimmer Capacitor 24 pF, 100 mil Chip Capacitor 120 pF, 100 mil Chip Capacitor 10 µF, 50 V Electrolytic Capacitor 1,200 pF, 100 mil Chip Capacitor 0.1 µF, 100 mil Chip Capacitor 380 pF, 100 mil Chip Capacitor 75 pF, 100 mil Chip Capacitor 82 nH, Coilcraft 55.5 nH, 5 Turn, Coilcraft 39 nH, 6 Turn, Coilcraft C1, C12 C2 C3, C10 C4 C5, C16 C6, C13 C7, C14 C8, C15 C9 C11 L1 L2 L3 Type N Flange Mount 15 Ω, 0805 Chip Resistor 51 Ω, 1/2 W Resistor 100 Ω, 0805 Chip Resistor 33 kΩ, 1/8 W Resistor 0.136″ x 0.080″ Microstrip 0.242″ x 0.080″ Microstrip 1.032″ x 0.080″ Microstrip 0.145″ x 0.080″ Microstrip 0.260″ x 0.223″ Microstrip 0.134″ x 0.080″ Microstrip 0.490″ x 0.080″ Microstrip 0.872″ x 0.080″ Microstrip 0.206″ x 0.080″ Microstrip Glass Teflon, 31 mils, 2 oz. Copper Figure 10. 66 – 88 MHz Broadband Test Circuit TYPICAL CHARACTERISTICS, 66 – 88 MHz / . . . . . . ,-# $% &$'( . Figure 11. Output Power versus Input Power MOTOROLA RF DEVICE DATA / . + #))%))&*( !" #))$%)&$'( + + + + + + + + . + !"# $% &$'( Figure 12. Input Return Loss versus Output Power MRF1511T1 5 TYPICAL CHARACTERISTICS, 66 – 88 MHz %00#)')%%1)&2( ')&*( !"# $% &$'( / . Figure 13. Gain versus Output Power !"# $% &$'( %00#)')%%1)&2( !" #))$%)&$'( Figure 14. Drain Efficiency versus Output Power / . ,- / . *4 / . ,- / . *4 3# ' % &4'( Figure 15. Output Power versus Biasing Current 3# ' % &4'( %00#)')%%1)&2( 3 / 4' ,- / . *4 Figure 16. Drain Efficiency versus Biasing Current !" #))$%)&$'( / . # 1 '% &( Figure 17. Output Power versus Supply Voltage MRF1511T1 6 3 / 4' ,- / . *4 # 1 '% &( Figure 18. Drain Efficiency versus Supply Voltage MOTOROLA RF DEVICE DATA 0 / / Ω 0 / 5 0 / ,- 0 / 5 / . # 3 / 4'# !" / $ Zin ,- / . # 3 / 4'# !" / $ f MHz Zin Ω ZOL* Ω f MHz Zin Ω ZOL* Ω 135 20.1 –j0.5 2.53 –j2.61 66 25.3 –j0.31 3.62 –j0.751 155 17.0 +j3.6 3.01 –j2.48 77 25.6 +j3.62 3.59 –j0.129 175 15.2 +j7.9 2.52 –j3.02 88 26.7 +j6.79 3.37 –j0.173 = Complex conjugate of source impedance with parallel 15 Ω resistor and 68 pF capacitor in series with gate. (See Figure 1). Zin ZOL* = Complex conjugate of the load impedance at given output power, voltage, frequency, and ηD > 50 %. = Complex conjugate of source impedance with parallel 15 Ω resistor and 24 pF capacitor in series with gate. (See Figure 10). ZOL* = Complex conjugate of the load impedance at given output power, voltage, frequency, and ηD > 50 %. Note: ZOL* was chosen based on tradeoffs between gain, drain efficiency, and device stability. -6!" 7"89,-: ;"< => !"6!" 7"89,-: ;"< => ;?,8; -*;= ;@" Z in Z * OL Figure 19. Series Equivalent Input and Output Impedance MOTOROLA RF DEVICE DATA MRF1511T1 7 Table 1. Common Source Scattering Parameters (VDD = 7.5 Vdc) IDQ = 150 mA S11 S21 S12 S22 f MHz |S11| ∠φ |S21| ∠φ |S12| ∠φ |S22| ∠φ 30 0.88 –165 18.92 95 0.015 8 0.84 –169 50 0.88 –171 11.47 91 0.016 –5 0.84 –173 100 0.87 –175 5.66 85 0.016 –7 0.84 –176 150 0.87 –176 3.75 82 0.015 –5 0.85 –176 200 0.87 –177 2.78 78 0.014 –6 0.84 –176 250 0.87 –177 2.16 75 0.014 –10 0.85 –176 300 0.88 –177 1.77 72 0.012 –17 0.86 –176 350 0.88 –177 1.49 69 0.013 –11 0.86 –176 400 0.88 –177 1.26 66 0.013 –17 0.87 –175 450 0.88 –177 1.08 64 0.011 –20 0.87 –175 500 0.89 –176 0.96 63 0.012 –20 0.88 –175 IDQ = 800 mA S11 S21 S12 S22 f MHz |S11| ∠φ |S21| ∠φ |S12| ∠φ |S22| ∠φ 30 0.89 –166 18.89 95 0.014 10 0.85 –170 50 0.88 –172 11.44 91 0.015 8 0.84 –174 100 0.87 –175 5.65 86 0.016 –2 0.85 –176 150 0.87 –177 3.74 82 0.014 –8 0.84 –177 200 0.87 –177 2.78 78 0.013 –18 0.85 –177 250 0.88 –177 2.16 75 0.012 –11 0.85 –176 300 0.88 –177 1.77 73 0.015 –15 0.86 –176 350 0.88 –177 1.50 70 0.009 –7 0.87 –176 400 0.88 –177 1.26 67 0.012 –3 0.87 –176 450 0.88 –177 1.09 65 0.012 –18 0.87 –175 500 0.89 –177 0.97 64 0.009 –10 0.88 –175 IDQ = 1.5 A S11 S21 S12 S22 f MHz |S11| ∠φ |S21| ∠φ |S12| ∠φ |S22| ∠φ 30 0.90 –168 17.89 95 0.013 2 0.86 –172 50 0.89 –173 10.76 91 0.013 3 0.86 –175 100 0.88 –176 5.32 86 0.014 –19 0.86 –177 150 0.88 –177 3.53 83 0.013 –6 0.86 –177 200 0.88 –177 2.63 80 0.011 –4 0.86 –177 250 0.88 –178 2.05 77 0.012 –14 0.86 –177 300 0.88 –177 1.69 75 0.013 –2 0.87 –177 350 0.89 –177 1.43 72 0.010 –9 0.87 –176 400 0.89 –177 1.22 70 0.014 –3 0.88 –176 450 0.89 –177 1.06 68 0.011 –8 0.88 –176 500 0.89 –177 0.94 67 0.011 –15 0.88 –176 MRF1511T1 8 MOTOROLA RF DEVICE DATA APPLICATIONS INFORMATION DESIGN CONSIDERATIONS This device is a common–source, RF power, N–Channel enhancement mode, Lateral Metal–Oxide Semiconductor Field–Effect Transistor (MOSFET). Motorola Application Note AN211A, “FETs in Theory and Practice”, is suggested reading for those not familiar with the construction and characteristics of FETs. This surface mount packaged device was designed primarily for VHF and UHF portable power amplifier applications. Manufacturability is improved by utilizing the tape and reel capability for fully automated pick and placement of parts. However, care should be taken in the design process to insure proper heat sinking of the device. The major advantages of Lateral RF power MOSFETs include high gain, simple bias systems, relative immunity from thermal runaway, and the ability to withstand severely mismatched loads without suffering damage. MOSFET CAPACITANCES The physical structure of a MOSFET results in capacitors between all three terminals. The metal oxide gate structure determines the capacitors from gate–to–drain (Cgd), and gate–to–source (Cgs). The PN junction formed during fabrication of the RF MOSFET results in a junction capacitance from drain–to–source (Cds). These capacitances are characterized as input (Ciss), output (Coss) and reverse transfer (Crss) capacitances on data sheets. The relationships between the inter–terminal capacitances and those given on data sheets are shown below. The Ciss can be specified in two ways: 1. Drain shorted to source and positive voltage at the gate. 2. Positive voltage of the drain in respect to source and zero volts at the gate. In the latter case, the numbers are lower. However, neither method represents the actual operating conditions in RF applications. =7,:* 7"; *@ ,@@ / :* :@ @@ / :* *@ =@@ / :* :@ !=8; DRAIN CHARACTERISTICS One critical figure of merit for a FET is its static resistance in the full–on condition. This on–resistance, RDS(on), occurs in the linear region of the output characteristic and is specified at a specific gate–source voltage and drain current. The MOTOROLA RF DEVICE DATA drain–source voltage under these conditions is termed VDS(on). For MOSFETs, VDS(on) has a positive temperature coefficient at high temperatures because it contributes to the power dissipation within the device. BVDSS values for this device are higher than normally required for typical applications. Measurement of BVDSS is not recommended and may result in possible damage to the device. GATE CHARACTERISTICS The gate of the RF MOSFET is a polysilicon material, and is electrically isolated from the source by a layer of oxide. The DC input resistance is very high – on the order of 109 Ω — resulting in a leakage current of a few nanoamperes. Gate control is achieved by applying a positive voltage to the gate greater than the gate–to–source threshold voltage, VGS(th). Gate Voltage Rating — Never exceed the gate voltage rating. Exceeding the rated VGS can result in permanent damage to the oxide layer in the gate region. Gate Termination — The gates of these devices are essentially capacitors. Circuits that leave the gate open–circuited or floating should be avoided. These conditions can result in turn–on of the devices due to voltage build–up on the input capacitor due to leakage currents or pickup. Gate Protection — These devices do not have an internal monolithic zener diode from gate–to–source. If gate protection is required, an external zener diode is recommended. Using a resistor to keep the gate–to–source impedance low also helps dampen transients and serves another important function. Voltage transients on the drain can be coupled to the gate through the parasitic gate–drain capacitance. If the gate–to–source impedance and the rate of voltage change on the drain are both high, then the signal coupled to the gate may be large enough to exceed the gate–threshold voltage and turn the device on. DC BIAS Since this device is an enhancement mode FET, drain current flows only when the gate is at a higher potential than the source. RF power FETs operate optimally with a quiescent drain current (IDQ), whose value is application dependent. This device was characterized at IDQ = 150 mA, which is the suggested value of bias current for typical applications. For special applications such as linear amplification, IDQ may have to be selected to optimize the critical parameters. The gate is a dc open circuit and draws no current. Therefore, the gate bias circuit may generally be just a simple resistive divider network. Some special applications may require a more elaborate bias system. GAIN CONTROL Power output of this device may be controlled to some degree with a low power dc control signal applied to the gate, thus facilitating applications such as manual gain control, ALC/AGC and modulation systems. This characteristic is very dependent on frequency and load line. MRF1511T1 9 MOUNTING The specified maximum thermal resistance of 2°C/W assumes a majority of the 0.065″ x 0.180″ source contact on the back side of the package is in good contact with an appropriate heat sink. As with all RF power devices, the goal of the thermal design should be to minimize the temperature at the back side of the package. Refer to Motorola Application Note AN4005/D, “Thermal Management and Mounting Method for the PLD–1.5 RF Power Surface Mount Package,” and Engineering Bulletin EB209/D, “Mounting Method for RF Power Leadless Surface Mount Transistor” for additional information. AMPLIFIER DESIGN Impedance matching networks similar to those used with bipolar transistors are suitable for this device. For examples see Motorola Application Note AN721, “Impedance Matching Networks Applied to RF Power Transistors.” Large–signal MRF1511T1 10 impedances are provided, and will yield a good first pass approximation. Since RF power MOSFETs are triode devices, they are not unilateral. This coupled with the very high gain of this device yields a device capable of self oscillation. Stability may be achieved by techniques such as drain loading, input shunt resistive loading, or output to input feedback. The RF test fixture implements a parallel resistor and capacitor in series with the gate, and has a load line selected for a higher efficiency, lower gain, and more stable operating region. Two–port stability analysis with this device’s S–parameters provides a useful tool for selection of loading or feedback circuitry to assure stable operation. See Motorola Application Note AN215A, “RF Small–Signal Design Using Two–Port Parameters” for a discussion of two port network theory and stability. MOTOROLA RF DEVICE DATA NOTES MOTOROLA RF DEVICE DATA MRF1511T1 11 PACKAGE DIMENSIONS L R C A F U ZONE X 4 3 ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ ÉÉÉÉ ÉÉÉ ÉÉÉ 10_DRAFT P 2 N K 1 Q S . . . . ZONE V H G D B . . ZONE W . . . . J E 0.89 (0.035) X 45 _ "5 _ 1% A . . . . ' '% % % RESIN BLEED/FLASH ALLOWABLE %A . % ' %' % ' 1. # . . %A . % %%B' '$'% % # $# ' C. CASE 466–02 ISSUE B inches mm SOLDER FOOTPRINT DIM A B C D E F G H J K L N P Q R S U ZONE V ZONE W ZONE X INCHES MIN MAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MILLIMETERS MIN MAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. MOTOROLA and the logo are registered in the US Patent & Trademark Office. All other product or service names are the property of their respective owners. E Motorola, Inc. 2002. How to reach us: USA/EUROPE/Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3–20–1, Minami–Azabu. Minato–ku, Tokyo 106–8573 Japan. 81–3–3440–3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong. 852–26668334 Technical Information Center: 1–800–521–6274 HOME PAGE: http://www.motorola.com/semiconductors/ MRF1511T1 12 ◊ MRF1511/D MOTOROLA RF DEVICE DATA