Hybrid equivalent model 5.5 The hybrid equivalent model Approximate model CE and CB 5.6 Hybrid π model High frequencies => Chapter 9 5.25 Complete hybrid equivalent model, including RS and RL Equations to determine: Ai, Av, Zi and Zo

5.5 The hybrid equivalent model For the hybrid equivalent model the parameters are defined at an operating point that may or may not reflect the actual operating conditions of the amplifier

5.5 The hybrid equivalent model (cont’d) Short-circuit input-impedance parameter Open-circuit reverse transfer voltage ratio parameter Short-circuit forward transfer current ratio parameter Open-circuit output-admittance parameter

5.5 The hybrid equivalent model (cont’d)

5.5 The hybrid equivalent model (cont’d): CE and CB

5.5 The hybrid equivalent model versus re model

5.5 The hybrid equivalent model versus re model (cont’d)

5.6 Hybrid π model

5.25 Complete hybrid equivalent model

5.25 Complete hybrid equivalent model: Ai

5.25 Complete hybrid equivalent model: Av

5.25 Complete hybrid equivalent model: Zi

5.25 Complete hybrid equivalent model: Zo