Electronic Circuit Analysis

Chapter 12

High Frequency Transistor Circuitsl

Learning Objectives

To get familiarity of high-frequency behaviour of transistor

• Concepts of Transistor behaviour at high frequencies.
• Hybrid-π circuits of Transistor for various configurations.
• Analysis of f_α, f_β, f_T, Bandwidth and Amplifier frequency response.
• High frequency equivalent circuits and analysis of FET and MOSFET.

12.1 TRANSISTOR AT HIGH FREQUENCY INPUT SIGNALS

For high frequency signal operation, junction capacitances of Transistors and terminal capacitances play dominant role. Separate high frequency equivalent circuits using hybrid-π model are developed for suitable analysis. This model can be used at low-frequency and high-frequency operations.

1. When input signals are of ...