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AN-0002 - Biasing Circuits and Considerations

Description

Part No.

Features

  • The user does not need to implement all of the functions, but they are shown here for illustrative purposes. The main features of this circuit are:.
  • Constant Operating Current.
  • Reduction of Part -to-Part Variation.
  • Temperature Compensation.
  • Negative Voltage Generator.
  • Power Sequencing (Negative before positive) Positive Supply Q3 R1 R5 R3 Vdd Q1 Q2 DUT Vgg R2 R4 +5V U2 MAX881R C1+ C1 C1C3 NC IN C2 +5V NEG OUT GND /POK OUT ON/OFF.

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Datasheet Details

Part number AN-0002
Manufacturer ANADIGICS
File Size 140.99 KB
Description Biasing Circuits and Considerations
Datasheet download datasheet AN-0002 Datasheet
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Full PDF Text Transcription

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MESFET Amplifier Biasing AN-0002 Biasing Circuits and Considerations for GaAs MESFET Power Amplifiers Summary In order to properly use any amplifier it is necessary to provide the correct operating environment, especially the DC bias. This application note outlines some of the considerations for biasing MESFET amplifiers. Items considered herein are: • Constant current operation, • Temperature compensation of the biasing network, and • Power sequencing of the applied voltages. Overview The I-V curves of Figure 1 represent a typical MESFET device in a common source configuration. For a typical device operating in Class A the desired current is 50% of the maximum current for any particular part.
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