FET Mixers

FET Mixers

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This chapter has dealt with the subject of single and dual gate FETs used in frequency conversion applications. It has been shown (Loriou et al, 1976) that both types of MESFET suffer from 1/f noise contributions for IFs much below a few hundred megahertz. The general device requirements for FETs to be used in mixer and other conversion circuits are very similar to those requirements for low noise amplifiers. Recently, considerable theoretical work has been achieved to explain observed FET mixer noise figure performances with the frequency of the IF and the signal LO and IF loads. Recent studies into the signal, LO, IF, image and sum frequency terminations have given an insight into the optimum conditions for conversion gain especially with single gate FET mixers. Since the matching of the second gate of a dual gate FET can be difficult over relatively broad bandwidths, as it is in the amplifier case discussed in Chapter 2, the use of dual-gate FETs in mixers, although producing simple injection of LO and signal frequencies, has led to other FET based circuits being realized particularly at the lower frequencies (Van Tuyl, 1980; Suffolk et al, 1980; Ablassmeier, et al, 1980). Dual-gate FETs are now receiving considerable attention as efficient up-converters and multipliers as well as in self-oscillating mixer circuits (Stahlmann et al, 1979).

Chapter Contents:

  • 6.1 Introduction
  • 6.2 The GaAs FET as a Mixing Element
  • 6.3 Experimental Results on Gate Mixers
  • 6.4 Noise Figure
  • 6.5 Signal Handling of FET Mixers
  • 6.6 Further Mixer Configurations Using Single Gate FETs
  • 6.7 The Dual Gate Mixer
  • 6.8 Image Rejection Mixers
  • 6.9 Frequency Up-Conversion Using Dual-gate FETs
  • 6.10 Frequency Multiplication
  • 6.11 Conclusions
  • 6.12 Bibliography

Inspec keywords: 1/f noise; field effect transistors; mixers (circuits)

Other keywords: noise figure performance; conversion circuit; low noise amplifier; up-converter; image; LO signal; conversion gain; 1/f noise; multiplier; FET based circuit; frequency conversion application; self-oscillating mixer circuit; dual gate FET mixer; signal frequency; IF load; MESFET; sum frequency termination; single gate FET mixer

Subjects: Other topics in statistics; Modulators, demodulators, discriminators and mixers; Insulated gate field effect transistors

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