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SKY65120 - WCDMA PA Bias Method

Datasheet Summary

Description

The active circuit is designed to maintain a constant supply current to the base of its respective transistor as supply voltage and temperature is changed.

Each active bias circuit consists of three HBT transistors and three resistors, connected as shown in Figure 2 below.

Features

  • ully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and.

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Datasheet preview – SKY65120

Datasheet Details

Part number SKY65120
Manufacturer Skyworks Solutions
File Size 1.20 MB
Description WCDMA PA Bias Method
Datasheet download datasheet SKY65120 Datasheet
Additional preview pages of the SKY65120 datasheet.

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Full PDF Text Transcription

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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.
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