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The Difference Amplifier

The Difference Amplifier

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This chapter develops the concept of difference amplifiers as applied to high-frequency design. The author has used the models developed in the last chapter to analyze these circuits. The author found that by setting the time constant of the parallel combination of ReCe to the transistor Tt, the input impedance at the base would look like a pure capacitor that could be series-, shunt-, or T-coilpeaked. The authors developed the concept of a level-shift PNP transistor that allowed a complete gain block to be created. The gain block is designed so that it has zero DC volts at both the input and output along with the same impedance levels (usually 50-100 Ω). This allows gain blocks to be directly cascaded.

Chapter Contents:

  • 3.1 Difference Amplifier Basics
  • 3.2 High-Frequency Gain of the Difference Amplifier
  • 3.3 Series Peaking
  • 3.4 Adding a PNP Level-Shifter
  • 3.5 Full Differential Amplifier Driven Differentially
  • 3.6 A Single-Ended Difference Amplifier
  • 3.7 The ft Doubler
  • 3.8 Noise Figure
  • 3.9 A Capacitive Load
  • 3.10 FET Differential Amplifier
  • 3.11 Chapter Summary
  • References

Inspec keywords: differential amplifiers; HF amplifiers; transistors; capacitors

Other keywords: shunt-coilpeaked; difference amplifier; circuits analysis; T-coilpeaked; parallel combination; capacitor; resistance 50 ohm to 100 ohm; high-frequency design; series-coilpeaked; complete gain block; input impedance; level-shift PNP transistor

Subjects: Amplifiers; Capacitors; Semiconductor devices

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