Technical Report Technical Report, 2009-Aug-14 BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ Technical Report TR102 Device: BGB741L7ESD Application: WiMAX LNA from 2.3GHz to 3.7GHz Revision: Rev. 1.2 Date: 2009-Aug-14 RF and Protection Devices 1 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ Published by Infineon Technologies AG 81726 München, Germany © Infineon Technologies AG 12/18/09. All Rights Reserved. Legal Disclaimer The information given in this document shall in no event be regarded as a guarantee of conditions or characteristics (“Beschaffenheitsgarantie”). With respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, Infineon Technologies hereby disclaims any and all warranties and liabilities of any kind, including without limitation warranties of non-infringement of intellectual property rights of any third party. Information For further information on technology, delivery terms and conditions and prices please contact your nearest Infineon Technologies Office (www.infineon.com). Warnings Due to technical requirements components may contain dangerous substances. For information on the types in question please contact your nearest Infineon Technologies Office. Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered. 2 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 1. Overview Infineon Device: BGB741L7ESD Application: WiMax LNA for 2.3GHz … 3.7GHz 2. Description: BGB741L7ESD is a broadband featured RF transistor with integrated active biasing circuit, feedback circuit and ESD protection. Due to Infineon’s excellent RF transistor technologies, BGB741L7ESD still owns quite low noise figure of about 1.1 dB at 2.3 GHz and 1.25 dB at 3.7 GHz although a feedback circuit. Therefore BGB741L7ESD is very suitable for WiMAX applications which require well-defined broadband characteristics. Figure 2-1: Overview of BGB741L7ESD The Input and output matching are also integrated into the circuit. Therefore no critical matching elements are required in the applications. Through the external resistor RExt, it is easy to tune the current consumption of BGB741L7ESD in the range of 6 mA to 12 mA. In this application example, 3.3 kΩ is used to achieve 11 mA. 3 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 3. Schematics: Figure 3-1: Schematics of the application circuit Table 3-1: Bill of Materials: Symbol Value Unit Size Supplier Cin 47 pF 0402 Various Cout 47 pF 0402 Various Cstab1 100 nF 0402 Various Cstab2 100 nF 0402 Various LB 40 nH 0402 Murata LQW15 series LC 40 nH 0402 Murata LQW15 series Rext 3.3 kΩ 0402 Various J1 0 Ohm 0402 Various 4 Comment not necessary for final PCB design 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 4. Summary of Data Table 4-1: Measurement data at room temperature Parameter Symbol Value Unit Note/Test Condition Frequency Range Freq 2.3 – 2.7 GHz DC Voltage Vcc 3.0 V DC Current Icc 10.8 mA Gain G 18.7 dB Off-Mode Gain Goff -18 dB Noise Figure NF 1.1 dB Input Return Loss S11 12 dB @2.5GHz Output Return Loss S22 12 dB @2.5GHz Input P1dB IP1dB -6.7 dBm @2.5GHz Output P1dB OP1dB +11 dBm @2.5GHz Input IP3 IIP3 +2 dBm @2.5GHz Output IP3 OIP3 +20.7 dBm @2.5GHz Stability k >1 -- Vctrl=0V Unconditionally stable Note: board losses is removed for gain and noise figure. Table 4-2: Measurement data at room temperature Parameter Symbol Value Unit Note/Test Condition Frequency Range Freq 3.4 – 3.7 GHz DC Voltage Vcc 3.0 V DC Current Icc 10.8 mA Gain G 17 dB Off-Mode Gain Goff -18.5 dB Noise Figure NF 1.25 dB Input Return Loss S11 12 dB @3.5GHz Output Return Loss S22 12 dB @3.5GHz Input P1dB IP1dB -6.5 dBm @3.5GHz Output P1dB OP1dB +9.5 dBm @3.5GHz Input IP3 IIP3 +3.5 dBm @3.5GHz Output IP3 OIP3 +20.5 dBm @3.5GHz Stability k >1 -- Vctrl=0V Unconditionally stable Note: board losses is removed for gain and noise figure. 5 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 5. Measured Graphs 5.1 High-Gain Mode Characteristics: Narrowband Gain 20 DB(|S(2,1)|) B1_BGB741_1_4_GHz_PE 19 18 17 16 15 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2 Frequency (GHz) 3.3 3.4 3.5 3.6 3.7 Figure 5-1: Gain curve of BGB741L7 for 2.3GHz to 3.7GHz (line losses not deembeded) Wideband Gain 30 DB(|S(2,1)|) B1_BGB741_1_4_GHz_PE 25 20 15 10 5 0 0 1 2 3 4 5 6 Frequency (GHz) 7 8 9 10 Figure 5-2: Wideband gain curve of BGB741L7 6 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ Noise Figure 1.5 PlotCol(1,2) Noise Figure Noise Figure (dB) 1.4 1.3 1.2 1.1 1 2.3 2.5 2.7 2.9 3.1 Frequency (GHz) 3.3 3.5 3.7 Figure 5-3: Noise figure curve of BGB741L7 for 2.3GHz to 3.7GHz (line loss deembeded) Input and Output Matching 0 DB(|S(1,1)|) B1_BGB741_1_4_GHz_PE DB(|S(2,2)|) B1_BGB741_1_4_GHz_PE -5 -10 -15 -20 2 2.5 3 Frequency (GHz) 3.5 4 Figure 5-4: Input matching (blue line) and output matching (red line) of BGB741L7 over frequencies. 7 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 5.2 Off-Mode Characteristics: Wideband Off_Mode Gain -10 DB(|S(2,1)|) BGB741L7_Off -15 -20 -25 -30 0 1 2 3 4 5 6 Frequency (GHz) 7 8 9 10 Figure 5-5: Wireband S21 curve of BGB741L7 in the off-mode (Vcc=3V, Vctrl=0V) Input and Output Matching in off mode 0 DB(|S(1,1)|) BGB741L7_Off DB(|S(2,2)|) BGB741L7_Off -2 -4 -6 -8 -10 2 2.5 3 Frequency (GHz) 3.5 4 Figure 5-6: Input matching (blue line) and output matching (red line) of BGB741L7 over frequencies in the off mode (Vcc=3V, Vctrl=0V). 8 2009-Aug-14 Technical Report BGB741L7ESD for WiMAX LNA 2.3GHz … 3.7GHz _______________________________________________________________ 6. Evaluation Board and Layout Information J1 Figure 6-1: PCB Overview (PCB ID-No: BGB7-Family, TSLP-7-1) Figure 6-2: Layout Information www.Infineon.com Published by Infineon Technologies AG 9 2009-Aug-14