Slide 25 CommonBase CB Configuration The input Vi

Slide 25 Common-Base (CB) Configuration The input (Vi) is applied to the emitter and the output (Vo) is from the collector. The Common-Base is characterized as having low input impedance and high output impedance with a current gain less than 1 and a very high voltage gain.

Slide 26 You will need to determine and re. re Model

Slide 27 Impedance Calculations Input Impedance: [Formula 8. 54] Output Impedance: [Formula 8. 55]

Slide 28 Gain Calculations Voltage Gain (Av): [Formula 8. 56] Current Gain (Ai): [Formula 8. 57]

Slide 29 Phase Relationship A CB amplifier configuration has no phase shift between input and output.

Slide 30 CE Collector Feedback Configuration This is a variation of the CE Fixed-Bias configuration.

Slide 31 You will need to determine and re. re Model

Slide 32 Impedance Calculations Input Impedance: [Formula 8. 58] Output Impedance: [Formula 8. 59]

Slide 33 Gain Calculations Voltage Gain (Av): [Formula 8. 60] Current Gain (Ai): [Formula 8. 61] [Formula 8. 62]

Slide 34 Phase Relationship This is a CE amplifier configuration; therefore there is a 180 -degree phase shift between input and output.

Slide 35 Approximate Hybrid Equivalent Circuit The h-parameters can be derived from the re model: hie = re hfe = hoe = 1/ro hib = re hfb = - The h-parameters are also found in the specification sheet for the transistor.

Slide 36 CE Fixed-Bias Configuration

Slide 37 Hybrid Equivalent Circuit Impedances: [Formula 8. 83] [Formula 8. 84] Gain: [Formula 8. 85] [Formula 8. 86]