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SKY65120

Skyworks Solutions
Part Number SKY65120
Manufacturer Skyworks Solutions
Description WCDMA PA Bias Method
Published Mar 14, 2014
Detailed Description application note SKY65120: WCDMA PA Bias Method For Lower Junction Temperature Introduction This application note descr...
Datasheet PDF File SKY65120 PDF File

SKY65120
SKY65120

Overview
application note SKY65120: WCDMA PA Bias Method For Lower Junction Temperature Introduction This application note describes how SKY65120 may be used with reduced bias control to obtain better thermal performance.
It is especially useful for customers who may not have a suitable heat sink available directly below the PA module.
To achieve high gain (>23 dB), the SKY65120 consists of two stages of amplification.
The base current of each amplification stage is controlled by an on-die active bias circuit.
Each active bias circuit has its own reference voltage supply, Vref1 and Vref2.
The bias voltage (Vc_Bias) is shared by the two active bias circuits.
This application note describes the active bias circuit used by SKY65120.
The note explains the use of external supply voltages (Vc_Bias and Vref) and setting limits available to the customer.
Test results of key parameters are also given over temperature.
VREF1 (5 V) RREF1 VC_BIAS (5 V) VREF2 (5 V) RREF2 Active Bias Circuit Circuit Descri...


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