SKY77529 201206B SY77529 EN20-D656-007 615R54-021 5406R16-049 5404R70-025 - Datasheet Archive

 

SKY77529 Rx-Tx Front-End Module ­ Implementation Applicability: SKY77529 Tx Front-End Module for Dual-Band GSM / GPRS / EDGE

 

APPLICATION NOTE SKY77529 SKY77529 Rx-Tx Front-End Module ­ Implementation Applicability: SKY77529 SKY77529 Tx Front-End Module for Dual-Band GSM / GPRS / EDGE Introduction The SKY77529 SKY77529 Front End Module (FEM) supports dual-mode, quad-band power amplification and antenna path switching for GMSK / EDGE applications in systems using a specific direct-launch EDGE architecture. The antenna switch provides 4 linear ports for WCDMA pass-through. Integrated power detection is supported through RF linear power detection. Signal path switching is supported with an integrated SP8T switch. ESD protection and DC blocking of the switch are also integrated. Device control is accomplished with a Serial Peripheral Interface (SPI) bus function. All information for configuring mode, band, and enable are controlled through a bidirectional three wire serial bus control interface. Figure 1. SKY77529 SKY77529 Functional Block Diagram Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 1 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION SKY77529 SKY77529 Power Amplifier Control Overview The power amplifier supports a constant gain, linear operation for EDGE mode and a saturated operation for GMSK mode. Figure 2 depicts the bias control architecture for the SKY77529 SKY77529. Figure 2. Bias Control Architecture ­ SKY77529 SKY77529 During the linear EDGE operation, amplifier quiescent current is maintained constant, independent of temperature, to maintain constant intercept performance. The RF input drive level of the amplifier controls output power; the VRAMP signal provides analog control of the bias points. Output power is detected and translated to DC voltage via a linear detector circuit and buffer amplifier. DC output of the RF detector is linearly related to output power. During saturated GMSK operation, the RF input drive is held constant while saturation characteristics of the amplifier are used to control output power. Stage 1 and stage 2 amplifiers are forced into saturated mode by reducing the collector voltage to limit the large signal gain of the driver stages, reducing the input level to the final stage amplifier. Coincident reduction of quiescent current in the amplifier reduces the small signal gain and current drain. Closed loop power control is provided external to the controller. In the Application Diagram (Figure 3), the transceiver forms a closed loop with the SKY77529 SKY77529. During EDGE mode, the transceiver monitors the linear detector output voltage and modifies the RF input during the burst ramp. VRAMP is used to set the bias point of the amplifier stages. During GMSK mode, the detector is monitored while VRAMP is used to set output power. VDET is also used internally to set the bias points of the amplifier stages. The Application Diagram (Figure 3) indicates the recommended passive components external to the FEM. These include components for power supply filtering, control signal filtering, input matching, and ESD protection. The values for the VCC bypass capacitors are dependant on the noise level on the phone board. Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 2 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 3. SKY77529 SKY77529 Application Diagram VRAMP Filter It is advisable to use a first order RC network on the VRAMP line to filter noise introduced by the baseband DAC. The filter should be so designed to avoid slowing down the power mask timing requirements. Note: Recommended RC network values: 1 k resistor with a 33 pF capacitor. VRAMP Profile for GMSK Operation All ramping properties are determined by and limited by the specific baseband device and control software. Antenna Port ESD Network An LC network external to the Antenna is required to meet the IEC 61000-4-2 standard. Rx Port DC Block The DC offset of up to 400 mV on the Rx ports can be blocked with the 33 pF series elements. Logic and Input Settings Table 1. Recommended VRAMP Bias EDGE Mode (8PSK, High Band, Low Band) POUT (dBm) 27.8 27.0 26.0 25.0 24.0 23.0 22.0 21.0 20.0 Threshold 1 0 D3 Current Sensor Current inflection point PA temperature > Threshold 2 0 D2 Tx Enable Switch on/off PA Engine and detector Reserved (default 0) 0 D1 PA Mode selection 8PSK / GMSK Reserved (default 0) 0 D0 PA Mode selection Low band / High band Reserved (default 0) 0 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 6 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Table 5. PA Temperature (Rear Register) Table 6. Current Sensor Flag (Read Register) D4 D3 PA Temperature Sensor D11 D10 D9 Current Sensor Feedback 0 0 T < T1 °C 0 0 0 Sensor not active 0 1 T > T1 °C 0 0 1 Sensor active 1 0 Not used 0 1 0 Not used 1 1 T > T2 °C 0 1 1 Not used 0 0 Not used 1 0 0 Not used 0 1 Not used 1 0 1 Not used 1 0 Not used 1 1 0 Not used 1 1 Not used 1 1 1 Not used Table 7. SPI Write Programming Truth Table D0 Band Select D10 D9 Sensor Configuration 0 Low band 0 0 Current sensor FB Off 1 High band 0 1 Current sensor FB Off D1 Mode Select 1 0 Current sensor FB On 0 GMSK 1 1 Current sensor FB On 1 8PSK D2 Tx Enable D15 FE Boost Converter 0 PA Off 0 Off 1 PA On 1 On Current Sensor D5 D4 D3 Mode = GMSDK Mode = 8PSK D14 D13 D12 D11 FE Status 0 0 0 1.6 A 0.6 A 0 0 0 0 Off 0 0 1 1.7 A 0.7 A 0 0 0 1 Tx_M GMSK ANT 0 1 0 1.8 A 0.8 A 0 0 1 0 Tx_L GMSK ANT 0 1 1 1.9 A 0.9 A 0 0 1 1 Reserved 1 0 0 2.0 A 1.0 A 0 1 0 0 Rx_L1 1 0 1 2.1 A 1.1 A 0 1 0 1 RxTx_M2 1 1 0 2.2 A 1.2 A 0 1 1 0 Rx_M3 1 1 1 2.3 A 1.3 A 0 1 1 1 Reserved D8 D7 D6 Not Assigned to Specific Function 1 0 0 0 Rx/Tx_L2 0 0 0 Default 1 0 0 1 Rx/Tx_M1 0 0 1 1 0 1 0 Rx/Tx_H 0 1 0 1 0 1 1 Reserved 0 1 1 1 1 0 0 Reserved 1 1 0 1 1 1 1 Reserved 1 1 1 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 7 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Figure 7. Timing Diagram ­ Up Ramping GMSK Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 8 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 8. Timing Diagram ­ Up Ramping 8PSK Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 9 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Figure 9. Timing Diagram ­ Transition 8PSK NB to GMSK NB Figure 10. Timing Diagram ­ Transition GMSK AB to 8PSK NB Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 10 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Linear Detector Power detection is supported through an integrated linear detector. The module level interface between the power amplifier outputs and detector inputs is accomplished with two directional couplers integrated onto the MCM laminate. Figure 11 is a block diagram of the SKY77529 SKY77529 detector/coupler; Figure 12 is a block diagram of the linear detector. The coupler outputs are routed to the controller IC. Separate bond wires connect the HB and LB signals to their respective detector inputs. The controller's logic decoder enables the appropriate detector during the TX burst (i.e. HB or LB). A single VDET output voltage, representing the magnitude of the output power in a linear V/V relationship, is provided at the VDET port of the SKY77529 SKY77529. Figure 11. Linear Detector/Coupler Interface Block Diagram Figure 12. Linear Detector Block Diagram Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 11 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION SKY77529 SKY77529 Test Fixture The SKY77529 SKY77529 test fixture assembly is shown in Figure 13 and the schematic of the test fixture is shown in Figure 14. Artwork of the four layers of the test fixture assembly is shown in Figure 15 through Figure 18. The active signal is ultimately determined by the SPI telegram applied from either the system or the Skyworks evaluation kit using the SPI interface board and software. Refer to Skyworks Application Note, SY77529 SY77529 SPI Test and Control, Document Number 201161. Figure 13. SKY77529 SKY77529 Test Fixture Assembly Diagram Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 12 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 14. SKY77529 SKY77529 Test Fixture Assembly Schematic Diagram Table 8. Bill of Material for SKY77529 SKY77529 Test Fixture Designators Part Number Description EN20-D656-007 EN20-D656-007 SKY77529 SKY77529 TRANSMIT MODULE TEST FIXTURE J1 22-23-2061 MOLEX CONNECTOR J2 90131-0127 MOLEX CONNECTOR P1­P9 615R54-021 615R54-021 CONNECTOR, SMA C10 5406R16-049 5406R16-049 CAPACITOR, 0402, 100 pF C11 5404R70-025 5404R70-025 CAPACITOR, 0402, 10000 pF C12, C13 5404R91-005 5404R91-005 CAPACITOR, 1206, CERAMIC, 10 F C16 1210Y6R3107ZNE 1210Y6R3107ZNE CAPACITOR, 1206, 100 F C18 5404R70-034 5404R70-034 CAPACITOR, 0402, CERAMIC, 1 uF R5 WSL0805R1000FEA WSL0805R1000FEA RESISTOR, 0805, 0.1 OHMS R6 5424R27-090 5424R27-090 RESISTOR, 0402, 51 kOHMS R8 WSL2512R0100FEA WSL2512R0100FEA RESISTOR, 2512, 0.01 OHMS Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 13 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION 201206_005 Figure 15. Test Fixture Board Layer 1 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 14 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE 201206_006 Figure 16. Test Fixture Board Layer 2 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 15 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION 201206_007 Figure 17. Test Fixture Board Layer 3 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 16 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE 2001206_008 Figure 18. Test Fixture Board Layer 4 Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 17 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Input / Output Pad Description Figure 19. SKY77529 SKY77529 Pad Names and Configuration (Top View) Table 9. SKY77529 SKY77529 Pad Names and Signal Descriptions Pad1 Name Description Pad1 Name Description 1 Antenna port 17 VCMOS Supply for CMOS controller and HBT driver stages 3 Rx_L1 Rx port GSM850/900 GSM850/900 19 VSPI Supply for SPI block 5 RxTx_L2 Rx port GSM850/900 GSM850/900; Rx / Tx port WCDMA; LB port V / VIII 20 CLK SPI signal 7 RxTx_H Rx / Tx port WCDMA; HB port Band I 21 DRW SPI signal 9 RxTx_M1 Rx port GSM1800/1900 GSM1800/1900; Rx / Tx port WCDMA; MB port II / III 22 SS SPI signal 11 RxTx_M2 Rx port GSM1800/1900 GSM1800/1900; Rx / Tx port WCDMA bands V, VIII 23 DET Output Detector Voltage 12 Rx_M3 Rx port GSM1800/1900 GSM1800/1900 25 Tx_LB Tx input GSM/EDGE low band 14 Tx_HB Tx Input GSM / EDGE HB 26 VQ3 Supply for HBT output stages 16 1 ANTENNA VRAMP Input voltage ramp signal. VRAMP controls output power in GMSK mode. In 8PSK, this signal is used to improve efficiency for lower output power by changing the bias currents of amplifier stages. GROUND PAD GRID Ground Pad Grid is device underside Pads 2, 4, 6, 8, 10, 15, 18, 24 are GROUND pads. Pad 13 is No Connect (internal) Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 18 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 20. VDET vs. POUT ­ 915 MHz Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 19 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Figure 21. VDET vs. POUT ­ 1910 MHz Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 20 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 22. POUT vs. VAPC ­ 915 MHz Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 21 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Figure 23. POUT vs. VAPC ­ 1910 MHz Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 22 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 24. Rx Port Insertion Loss Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 23 APPLICATION NOTE SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION Figure 25. EDGE Bias Switch On Time Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 24 October 22, 2010 · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · 201206B 201206B SKY77529 SKY77529 FRONT­END MODULE ­ EVALUATION INFORMATION APPLICATION NOTE Figure 26. EDGE Bias Switch Off Time Skyworks Solutions, Inc. · Phone [781] 376-3000 · Fax [781] 376-3100 · sales@skyworksinc.com · www.skyworksinc.com 201206B 201206B · Skyworks Proprietary Information · Products and Product Information are Subject to Change Without Notice. · October 22, 2010 25 Revision History Revision Date Description A February 10, 2010 Initial Release B October 22, 2010 Revise: Figures 1, 3, 4, 14, 19; Table 9; section "Layout Guidelines for Battery Bypassing" (p4) Add: Sections "Antenna Port ESD Network" and "Rx Port DC Block" (p4) References Skyworks Application Note: PCB Design and SMT Assembly/Rework, Document Number 101752 Skyworks Application Note: SKY77529 SKY77529 SPI Test and Control, Document Number 201161 Skyworks Data Sheet SKY77529 SKY77529 Rx-Tx Front-End Module for Dual-Band GSM / GPRS / EDGE, Document Number 201008 Copyright © 2010, Skyworks Solutions, Inc. All Rights Reserved. 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