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Low-Frequency Nonlinear Performance

Low-Frequency Nonlinear Performance

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So far, the author has not been overly concerned with low-frequency effects. Unfortunately, there are several issues that operate at DC or low frequencies that cause problems at higher frequencies. The changing of gm with some circuit parameter (gm modulation) and the thermal effects as a function of signal level and power are two such examples. Fortunately, a variety of circuits and techniques have been developed to either correct or greatly alleviate these problems. This chapter is devoted to these concepts. The authors begin this chapter using the basic hybrid-π model to derive low-frequency gain equations. While some of this repeats information from the previous chapters, a more coherent flow should make the concepts a little easier to follow.

Chapter Contents:

  • 4.1 Overview
  • 4.2 Basic Models
  • 4.3 gm Modulation
  • 4.4 Nonlinearity in Difference Amplifiers
  • 4.5 A Low-Distortion Difference Amplifier
  • 4.6 Feed-Forward Correction in FET Amplifiers
  • 4.7 Linearity Correction for ft Doublers
  • 4.8 Summary of Linearity-Correction Circuits
  • 4.9 Thermals
  • 4.10 Frequency-Dependent Dielectric Constants
  • 4.11 Problems with Attenuators
  • 4.12 Chapter Summary
  • References

Inspec keywords: nonlinear network analysis; integrated circuit modelling

Other keywords: low-frequency gain equations; low-frequency nonlinear performance; modulation; basic hybrid-π model; thermal effects; circuit parameter

Subjects: Digital circuit design, modelling and testing; Nonlinear network analysis and design; Semiconductor integrated circuit design, layout, modelling and testing

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