Application Note UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules Rev 3 Relevant products • AWT6278 • AWT6279 • AWT6282 General Description The ANADIGICS 4 mm x 4 mm hetero-junction bipolar transistor (HBT) power amplifier modules designed UMTS High Band, and operates from a single lithiumion (Li-ion) battery. The amplifier input and output are matched to provide optimum performance in a 50 Ω system; only minimal external components are required for proper RF bypassing. Table 1: Module Pin Description piN NAMe descRiptioN Notes 1 VBATT Battery Voltage +3.2 to +4.2 V 2 RFIN RF Input Use 50 transmission line 3 VMODE1 Mode Control Voltage 1 4 VMODE2 Mode Control Voltage 5 VENABLE PA Enable Voltage +2.15 to +3.1 V for Low Bias Mode 0 to +0.5 V for High Bias Mode +2.15 to +3.1 V for PA "on" 0 to +0.5 V for PA "shut down" RF Output Use 50 transmission line VCC Supply Voltage +3.2 to +4.2 V GND Ground 8 RFOUT 10 6, 7, 9 VBATT VCC C5 2.2 µF C1 0.01µF 1 2 RF IN VMODE2 VMODE1 VENABLE C2 0.01µF VBATT VCC RFIN GND 10 C3 0.01µF 9 3 VMODE2 RFOUT 8 4 VMODE1 GND 7 5 VENABLE GND 6 GND at slug 10K Optional pull-down Figure 1: Application Schematic 02/2010 C4 2.2µF ceramic RF OUT UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules EVALUATION BOARD The evaluation board, shown in Figure 2, was designed on ROGERS (R04033) material with 8 mils thickness. C10 C4 C7 C6 C1 C11 C2 Figure 2: Evaluation Board Layout Notes: 1. Copper trace width is 20.6 mils. 2. Relative dielectric constant is 3.38 at 1 GHz. 3. Dielectric thickness is 8.0 mils. Table 2: Evaluation Board Parts List descRiptioN vAlue siZe MANuFActuReR MANuFActuReR's p/N (Qty.) C1, C2, C3 0.01 F 0603 Panasonic ECJ-2YB1E103K (3) 2.2 F 0805 Panasonic ECJ-2YB0J225K (2) PC Board - - - 4x4PCSEVB (1) Sma Conn. - - Johnson Comp. 142-0701-851 (2) Conn. Hdr. - - AMP 4-103321-0 Alum. Block - - - Edgemountbase1 (1) C4, C5 (1) Notes: (1) Capacitors C4 and C5 must be ceramic type and 2.2 F value only. 2. If any DC signal is present at the input of this amplifier – the blocking capacitor should be used, placed in series to RF input trace. It is recommended to use a ceramic (0603 10 pF) capacitor. 3. Output Power at antenna port of the phone board should not exceed the power level specified on the data sheet (PA Max. output power - Front-end loss). All VSWR value at PA output port toward the antenna port should be lower than 8:1 under 28.5 dBm POUT condition, and lower than 5:1 in the absolute maximum RF output power (+31 dBm) condition. 2 Application Note - Rev 3 01/2010 UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules signal Generator dual dc power supply spectrum Analyzer in Test Setup Notes: 1. Figure 3 shows minimum equipment required for proper power amplifier operation. 2. Depending upon the power sensor, 10 to 20 dB attenuator is sufficient to prevent overloading of the power meter or the spectrum analyzer. Test Equipment The following test equipment is recommended for testing of WCDMA IMT/PCS evaluation boards. • One RF WCDMA(1) signal generator capable of delivering at least +5 dBm of output power at the operating frequency band (Agilent E4432B). • One RF power meter capable of measuring up to +30 dBm at the operating frequency band (Agilent E4419B). • One RF power sensor capable of measuring RF power in the range from -50 dBm to +30 dBm at the operating frequency band (Agilent E9301H). • One RF spectrum analyzer capable of measuring ACP in operating frequency band and covering up to the 3-rd harmonic of the highest frequency in band (Rohde & Schwarz FSP). • One DC power supply capable of delivering 1.5 A at +4 V and 500 mA at +3 V(Agilent 6624A) • One SMA 10 dB attenuator capable of handling 2 watts. Notes: (1) WCDMA: 3GPP 32-03-00, uplink, DPCCH + DPDCH and HSDPA Test Setup 1. Set DC power supply to +3.4 V (for VBATT and VCC), to +2.85 V (for VEN), and to 0 V (for VMODE1,2). 2. Set power meter measured frequency to 1950 MHz for IMT band (1750 MHz for 1700 band) and its calibration factor to correspond to the set frequency. 3. Set power meter offset value equal to the total loss of the attenuator, directional coupler, and connecting cables. 4. Set spectrum analyzer center frequency to 1950 MHz for IMT band (1750 MHz for 1700 band) and enable WCDMA(3GPP) measuring personality. 5. Select and enable WCDMA digital signal on the signal generator. 6. Set signal generator frequency to 1950 MHz for IMT band (1750 MHz for 1700 band) and output power to -10 dBm. 7. Ensure DC power supply is disabled and RF output of a signal generator is OFF. 8. Connect evaluation board to the test setup as shown. 9. Turn on DC power supply and measure the idle current. 10. Switch RF output of a signal generator to ON. 11. Increase amplitude of a signal generator to the desired output power level (according to the Application Note - Rev 3 01/2010 3 UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules corresponding data sheet). 12. Measure and record ACP, Gain (as a difference between Input and Output power levels) and total current consumption. Test sequence (Recommended PA turn-on and turn-off sequences): The PA must be enabled before RF input is applied. Refer to figure below for recommended timing of the PA enable voltage and RF input drive turn-on/off sequence. Turn-on sequence: 1. Refer to Figure 3 for recommended system level power up/down sequence. Do not turn on DC power supply before connecting DUT to RF input and output cables (make sure that RF output of a signal generator is OFF before connecting RF cables to DUT). 2. Turn on VCC first and then turn on VREF and VMODE. 3. Turn RF output of a signal generator ON and make measurements. Turn-off sequence: 1. Turn RF output of a signal generator OFF. Do not disconnect DUT from RF input and output cables before turning off DC power supply. 2. Turn off VREF and VMODE, and then VCC. 3. Disconnect DUT from the test setup. Layout Considerations A sufficient number of holes (QTY 12 - 0.2 mm diameter plated through hole) should be placed under the module in order to channel the heat properly. In addition, contact should be made between the PA slug located under the amplifier and the board. For hand assembly of the board, place sufficient bonding paste so that contact is made between the PA and ground. For large volume assembly, please refer to the solder profile recommendations application note. For RFIN and RFOUT, provide 50 transmission lines. Application Information To ensure proper performance, refer to all related Application Notes on the ANADIGICS web site: http://www.anadigics.com Shutdown Mode PA shutdown should follow recommended sequence, (Figure 3). This will avoid a possible “Hot Switch” condition. Bias Modes The power amplifier may be placed in either a Low Bias mode or a High Bias mode by applying the appropriate logic level (see Operating Ranges table) to the VMODE voltages. The Bias Control table lists the recommended modes of operation for various applications. Three operating modes are recommended to optimize current consumption. High Bias/High Power operating mode is for POUT levels > 16 dBm. At ~16dBm - 7 dBm, the PA should be “Mode Switched” to Medium Power Mode. For POUT levels < ~8 dBm, the PA can be switched to Low Power Mode for even lower quiescent current consumption. Output Power/VSWR Mandatory Output Power at antenna port of the phone board should not exceed the power level specified on the data sheet (PA Max. output power - Front-end loss). All VSWR value at PA output port toward the antenna port should be lower than 8:1 under 28.5 dBm POUT condition, and lower than 5:1 in the absolute maximum RF output power (+31 dBm) condition. RFIN (RF Input) Venable (PA Enable Voltage) 15 uS 15 uS VMODE1 HPM 5 uS Figure 3: Recommended Turn-On/Off Sequence 4 LPM/MPM Application Note - Rev 3 01/2010 UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules Table 5: Bias Control ApplicAtioN pout levels BiAs Mode veNABle vMode1 vMode2 vcc vBAtt WCDMA - low power (Low Bias Mode) < +8 dBm Low +2.4 V +2.4 V +2.4 V 3.2 - 4.2 V > 3.2 V WCDMA - med power (Medium Bias Mode) 7 POUT < +16 dBm Low +2.4 V +2.4 V 0V 3.2 - 4.2 V > 3.2 V WCDMA - high power (High Bias Mode) > +16 dBm High +2.4 V 0V 0V 3.2 - 4.2 V > 3.2 V Optional lower VCC in low power mode < +7 dBm Low +2.4 V +2.4 V 2.4 V 1.5 V > 3.2 V - Shutdown 0V 0V 0V 3.2 - 4.2 V > 3.2 V Shutdown Application Note - Rev 3 01/2010 5 UMTS 1700/IMT/PCS 4 mm x 4 mm Power Amplifier Modules ANADIGICS 141 Mount Bethel Road Warren, New Jersey 07059, U.S.A. Tel: +1 (908) 668-5000 Fax: +1 (908) 668-5132 URL: http://www.anadigics.com IMPORTANT NOTICE ANADIGICS, Inc. reserves the right to make changes to its products or to discontinue any product at any time without notice. The product specifications contained in Advanced Product Information sheets and Preliminary Data Sheets are subject to change prior to a product’s formal introduction. Information in Data Sheets have been carefully checked and are assumed to be reliable; however, ANADIGICS assumes no responsibilities for inaccuracies. ANADIGICS strongly urges customers to verify that the information they are using is current before placing orders. warning ANADIGICS products are not intended for use in life support appliances, devices or systems. Use of an ANADIGICS product in any such application without written consent is prohibited. 6 Application Note - Rev 3 02/2010