products:

Function:
A Gain Stage increases signal level for further processing. Often, it is used to raise the output level of one component to a sufficient level to drive the following component adequately.

Typically, a gain stage is created by conjugately matching the active component, i.e. both input and output are matched for minimum reflection. A common technique to conjugately match over a wide frequency range is to use a combination series and shunt resistive feedback. The trade-off in this approach is to reduce efficiency and gain and increase noise figure, in order to improve bandwidth and match, increase stability, and generally make the amplifier easier to use.

Schematic symbol:

Key Specifications Gain (G, S21) Range: 6 - 35 dB Match VSWR: 1.5:1 to 3:1 typ. Return Loss: -8 to -15 typ. Bandwidth Range: kHz to GHz (commonly <100 MHz)

 

Discrete Devices:

Bipolar Transistors as Gain Stages

   Gain comparison for Bipolar Transistors

GaAs FETs as Gain Stages

   Gain comparison for GaAs FETs

Integrated Circuits:

ICs for RF/uW Gain Stage Amplifiers

   Gain comparison - RF/uW ICs

ICs for millimeter wave Receivers, Direct Tansmitters, or Upconverting Transmitters

   Gain comparison - mmw ICs