RF2381 4 PCS/CELLULAR TDMA/CDMA/W-CDMA LINEAR VARIABLE GAIN AMPLIFIER Typical Applications • CDMA PCS/Cellular Handsets • W-CDMA Handsets • TDMA PCS/Cellular Handsets Product Description The RF2381 is a linear variable gain amplifier suitable for use in TDMA and CDMA systems in the cellular or PCS band and for W-CDMA systems. The features of this device include linear gain control, high gain, and high linearity. The IC is manufactured on an advanced Gallium Arsenide Heterojunction Bipolar Transistor (GaAs HBT) process and is featured in an industry-standard miniature 6-lead plastic SOT package. 1.80 1.40 TEXT * 1.90 GENERAL PURPOSE AMPLIFIERS 4 .10 MAX. .50 .35 3.10 2.70 3.00 2.60 1.30 1.00 .25 .10 9° 1° .90 .70 *When Pin 1 is in upper left, text reads downward (as shown). .37 MIN. All dimensions in mm. Optimum Technology Matching® Applied Si BJT Si Bi-CMOS ü GaAs HBT GaAs MESFET SiGe HBT Si CMOS Package Style: SOT23-6 Features • 50dB Linear Gain Control Range • 22dB Maximum Gain • Single 2.7V to 3.3V Supply • 35mA Supply Current RF OUT 1 6 VCC • High Linearity GND 2 GC 3 ATT ATT 5 GND 4 RF IN Ordering Information RF2381 RF2381 PCBA Functional Block Diagram Rev A1 010511 PCS/Cellular TDMA/CDMA/W-CDMA Linear Variable Gain Amplifier Fully Assembled Evaluation Board RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 4-43 RF2381 Absolute Maximum Ratings Parameter Supply Voltage DC Current Operating Ambient Temperature Storage Temperature Parameter GENERAL PURPOSE AMPLIFIERS 4 Rating Unit 0 to +5.0 100 -30 to +85 -40 to +150 VDC mA °C °C Specification Min. Typ. Max. Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Unit VCC =2.8V, VGC =2.0V, T=25°C Overall Usable Frequency Range Linear Gain Control Range Gain Control Slope Input VSWR Output VSWR Output IP3 Noise Figure 800 to 2100 MHz dB dB/V 50 +23 70 1.5:1 1.5:1 +26 9 2.5:1 2.5:1 Over entire gain control range Over entire gain control range dBm dB TDMA Operating Frequency Maximum Small Signal Gain Maximum Average Output Power Maximum Average Input Power 18 Adjacent Channel Power 1880 20 +8 -9 -8 MHz dB dBm dBm -33 -32 dBc -61 -52 dBc 1880 20 +6 22 MHz dB dBm 22 CDMA Operating Frequency Maximum Small Signal Gain Maximum Average Output Power 18 Maximum Average Input Power -13 dBm Adjacent Channel Power -53 dBc W-CDMA Operating Frequency Small Signal Gain Maximum Linear Output Power Adjacent Channel Power 4-44 Condition 17.5 1920 to 1980 19.5 +5 -46 MHz dB dBm dBc -43 dBc -43 dBc 22 Maximum gain VCC =2.8V, VGC =2.0V, T=25°C TDMA modulation; ACP<-32dBc TDMA modulation; for any VGC that gives POUT <+8dBm, ACP <-32dBc, ALT<-52dBc TDMA modulation; POUT <+8dBm and PIN <-11dBm, at all VGC. TDMA modulation; POUT <+8dBm and PIN <-11dBm, at all VGC. VCC =2.8V, VGC =2.0V, T=25°C CDMA modulation; VCC =3.0V, maximum gain setting, ACP<-52dBc. CDMA modulation; for any VGC that gives POUT <+6dBm, ACP <-52dBc CDMA modulation; VCC =3.0V. POUT <+6dBm and PIN <-13dBm, at all VGC. VCC =2.8V, VGC =2.0V, T=25°C W-CDMA ACP<-46dBc W-CDMA modulation; POUT <+5dBm and PIN <-12dBm W-CDMA modulation; Over entire gain control range, PIN <-17dBm W-CDMA modulation; VGC =1.0V, PIN <-14dBm Rev A1 010511 RF2381 Parameter Specification Min. Typ. Max. Unit Power Supply Supply Voltage 2.8 2.7 to 3.3 0 to 2.2 35 50 21 Gain Control Voltage (VGC) Supply Current VGC Current -2.0 +2.4 V V V mA mA mA mA Condition T=25°C Specifications Operating range VCC =2.8V, VGC =2.2V VCC =3.3V, VGC =2.2V VCC =2.8V, VGC =0.4V VGC =0.4V to 2.2V GENERAL PURPOSE AMPLIFIERS 4 Rev A1 010511 4-45 RF2381 Function RF OUT 2 GND 3 GC 4 5 RF IN GND 6 VCC GENERAL PURPOSE AMPLIFIERS 4 Pin 1 Description Interface Schematic RF output pin. This pin is DC-coupled and requires VCC through a bias inductor sized accordingly to provide a high pass transformation with a series capacitor. Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. Analog gain control pin. This pin controls the gain of the IC. Minimum gain occurs at VGC <0.4V and maximum gain is achieved with VGC =2.0V. 50dB of linear gain control with little variation of input P1dB is available. RF input pin. This pin is DC-coupled. Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. Power supply. This pin should be connected to a regulated supply and requires a series inductor and bypass capacitor. Voltage is supplied through this pin to the first stage collector; this voltage also controls the bias. Gain may be tuned by adjusting the value of the feed inductor. Application Schematic 1850MHz to 1910MHz 33 nF 100 pF RF IN 4 5 ATT ATT 2 1 pF 2.7 nH VCC 6 33 nF GC 3 RF OUT 1 33 pF 2.7 nH* Note orientation of package in this schematic. VCC *For W-CDMA, use 2.2 nH 4-46 Rev A1 010511 RF2381 Evaluation Board Schematic P1 1 GC 2 GND P1-3 3 VCC P1-4 4 P1-1 5 4 L2 2.7 nH VCC 5 C2 33 pF 2381401- 4 GC 3 ATT ATT 6 C3 33 nF Rev A1 010511 C4 33 nF C1 100 pF 2 C8 1 pF 50 Ω µstrip 1 Note orientation of package in this schematic. GENERAL PURPOSE AMPLIFIERS J1 RF IN 50 Ω µstrip GND J2 RF OUT L3 2.7 nH VCC C5 33 pF C6 33 nF C7 1 µF 4-47 RF2381 Evaluation Board Layout Board Size 2.0” x 2.0” Board Thickness 0.028”, Board Material FR-4, Multi-Layer GENERAL PURPOSE AMPLIFIERS 4 4-48 Rev A1 010511 RF2381 TDMA ACP versus POUT over Temperature, TDMA AltCP versus POUT over Temperature, PIN=-9 dBm, f=1880 MHz, VCC=2.8 V -25 PIN=-9 dBm, f=1880 MHz, VCC=2.8 V -40 +25°C +25°C -30°C -30°C -27 Note: Below POUT=-35 dBm, test equipment noise floor inhibits accurate AltCP measurement -50 AltCP (dBc) -29 ACP (dBc) +85°C -45 +85°C -31 -55 -33 -60 -35 -65 -37 GENERAL PURPOSE AMPLIFIERS 4 -70 -50 45.00 -40 -30 -20 -10 0 10 20 -50 -40 -30 -20 -10 0 10 20 POUT (dBm) POUT (dBm) Supply Current versus Gain-Control Voltage over Temperature, PIN=-9 dBm, F=1880 MHz, VCC=2.8 V Gain versus Gain-Control Voltage over Temperature, PIN=-9 dBm, F-1880 MHz, VCC=2.8 V 30.00 +25°C Icc,mA, +25°C Icc,mA, -30°C 40.00 -30°C 20.00 +85°C Icc,mA, +85°C 35.00 10.00 30.00 Gain (dB) ICC (mA) 0.00 25.00 20.00 -10.00 -20.00 15.00 -30.00 10.00 -40.00 5.00 0.00 -50.00 0.00 0.50 1.00 1.50 2.00 2.50 0.00 0.50 1.00 VGC (V) W-CDMA ACPR versus VGC at Various Output Powers -35 1.50 2.00 2.50 VGC (V) NF versus VGC (RF Freq. 1950MHz, VCC=2.8V, VGC=2.0 to 0.2V) 60.0 Pout=+2dBm Pout=+3dBm Note: Below VGC=~1.1V, test equipment noise floor inhibits accurate ACP measurement -40 Pout=+4dBm NF [dB] 50.0 Pout=+6dBm Pout=+8dBm NF (dB) ACPR (dBc) 40.0 -45 30.0 -50 20.0 -55 10.0 -60 0.0 0.8 1 1.2 1.4 VGC (V) Rev A1 010511 1.6 1.8 2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 VGC (V) 4-49 RF2381 Output Power versus Input Power (RF Freq. 1950MHz, VCC=2.8V, VGC=2.0V) 18.0 Pout [dBm] 16.0 12.0 10.0 4 8.0 GENERAL PURPOSE AMPLIFIERS Output Power (dBm) 14.0 6.0 4.0 -14.0 -12.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 2.0 4.0 6.0 Input Power (dBm) 4-50 Rev A1 010511