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5 - Circuit analysis techniques for high-frequency integrated circuits

Published online by Cambridge University Press:  05 March 2013

Sorin Voinigescu
Sorin Voinigescu
Affiliation:
University of Toronto
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Summary

Analog versus high-frequency circuit design

Analog ICs are characterized by the common use of:

  • differential stages with active loads,

  • DC-coupled broadband amplifiers (i.e. no DC-blocking capacitors are present between stages),

  • strong impedance mismatch between stages,

  • input and output impedance matching based on negative feedback or resistors.

At the same time, analog designers work with:

  • currents,

  • voltages,

  • transistors,

  • capacitors, and

  • resistors,

while employing small signal AC, noise, and transient large signal simulations to analyze the performance of their circuits. In contrast, traditional microwave circuit design deals with:

  • single-ended stages with a small number of transistors,

  • AC-coupled, tuned narrowband or broadband gain stages,

  • reactive components such as inductors, transformers, capacitors, and transmission lines, and

  • lossless impedance matching to maximize power gain and minimize noise figure.

Type
Chapter
Information
High-Frequency Integrated Circuits , pp. 318 - 373
Publisher: Cambridge University Press
Print publication year: 2013

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References

Pozar, D. M., Microwave and RF Wireless Systems, John Wiley & Sons, 2001, Chapter 5.
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