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Design of Microwave Active Devices by Jean-Luc Gautier

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Chapter 1

Amplification in Linear Mode

Chater written by Jean-Luc GAUTIER and Sébastien QUINTANEL.

1.1. Principles of microwave amplification

An amplifier is a device used to convert some of the power supplied by a direct current (DC) signal from a continuous power source into alternating current (AC) power at the frequency of the microwave signal applied on the input. It consists of the following elements:

– active components used for the amplification of the signal, such as bipolar (HBTs, etc.) and field-effect (MESFETs, HEMTs, etc.) transistors;
– passive components used for the polarization and impedance matching networks, such as transmission line segments, resistors, inductors an d capacitors.

Figure 1.1. Principle of amplification

c1-fig-001

It is possible to essentially classify microwave amplifiers according to various criteria, although this list is not exhaustive:

– Output power:
- low power: output power of a few tens of mW, operating in linear mode;
- medium power: output power ranging from a few hundred mW to a few W, essentially operating in nonlinear mode;
- high power: output power greater than a few W, operating in nonlinear mode, taking the phenomena of power dissipation into account.
– Frequency band of operation:
- narrowband: relative bandwidth images a percentage of several ...

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