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Voltage Detector Filter Optimization SKY65137 WLAN Power Amplifier
Skyworks SKY65137 Power Amplifier (PA) provides ideal features Wireless Local Area Network (WLAN) applications. device provides output voltage signal, V_DET (pin 14), voltage detector output filter. This signal used control input level signal source that driving RF_IN port (pin 18). most applications, this achieved baseband controller circuit. When modulated signal used input SKY65137, modulated signal coupled V_DET signal, itself. Depending baseband controller used application, this signal have filtered. This illustrated Figure This Application Note describes optimize V_DET output filter SKY65137. Refer device Data Sheet (document number 200851) additional electrical mechanical details.
Notch Filter
Circuit Description frequency notch filter recommended remove coupled signal from V_DET. Depending baseband controller requirements, coupled signal completely filtered, with trade-off rise time V_DET signal. schematic SKY65137 Evaluation Board shown Figure V_DET signal external components detector output filter, both shown with nominal values. However, recommended notch filter would have three external components completely filter coupled modulated signal. These three components illustrated Figure
Signal Source
Input
SKY65137
Output
V_DET Signal
Oscilloscope
Filter
S1562
Figure SKY65137/Voltage Detector Block Diagram
PA_EN
VC_BIAS
3300
Collector Voltage (Stage
RF_IN
Supply2
VCC1
Enable
VCC1
Detector Output
PA_EN
V_DET
V_DET VCC2 VCC3
SKY65137
VC_BIAS VCC2
3300
Bias Voltage
3300
Collector Voltage (Stage
Supply
VDET_CNTL
RF_OUT
VREF3
VCC3
3300
Collector Voltage (Stage
Note: Some component labels different than corresponding component symbol shown here. Component values, however, accurate date this Data Sheet.
S1243
Figure SKY65137 Evaluation Board Schematic
Skyworks Solutions, Inc. Phone [781] 376-3000 [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
201105A Skyworks Proprietary Confidential information Products Product Information Subject Change Without Notice July 2009
APPLICATION NOTE OPTIMIZING SKY65137 VOLTAGE DETECTOR FILTER
V_DET
S1563
Figure Recommended Notch Filter Topology
Figure V_DET Signal With Filter
Figure Filtered V_DET Signal
IEEE 802.11a standard requires V_DET signal switch off. This switching rise fall time, which baseband impose timing requirements. Figure plots result V_DET voltage measurements over time without filters. When this signal filtered with
recommended notch filter, resulting V_DET voltage measurements over time shown Figure filtered signal, however, rise time which acceptable baseband. Table provides list resistor values against rise time trade-off voltage ripple.
Skyworks Solutions, Inc. Phone [781] 376-3000 [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
July 2009 Skyworks Proprietary Confidential information Products Product Information Subject Change Without Notice 201105A
APPLICATION NOTE OPTIMIZING SKY65137 VOLTAGE DETECTOR FILTER
Conclusion
nominal filter implemented reference design appropriate most applications. However application more restrictions noise present voltage detector
signal, notch filter scheme implemented with much flexibility.
Table Notch Filter Series Resistor Values, Corresponding Rise Time Voltage Ripple
V_DET Series Resistor Value Match Rise Time <0.140 0.146 1.45 3.00 9.30 18.0 Voltage Ripple (mV) >200
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Skyworks Solutions, Inc. Phone [781] 376-3000 [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com
201105A Skyworks Proprietary Confidential information Products Product Information Subject Change Without Notice July 2009
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