33. Common Source Amplifier (Part B)
The chapter discusses the small signal equivalent circuit of the Common Source Amplifier, highlighting its key parameters like voltage gain, output resistance, and input resistance. It explores the mapping of the amplifier into both voltage and transconductance configurations, and addresses the effects of parasitic capacitances at high frequencies. Additionally, it provides a numerical example analyzing the gain and output swing of a common source amplifier circuit.
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What we have learnt
- The small signal equivalent circuit of the Common Source Amplifier involves setting DC bias to zero and analyzing parameters like voltage gain and output resistance.
- The amplifier can be represented as either a voltage amplifier or a transconductance amplifier, depending on the application.
- In high-frequency scenarios, parasitic capacitances must be considered, and the Miller effect plays a significant role in input port capacitance.
Key Concepts
- -- Voltage Gain
- The ratio of the output voltage to the input voltage, represented mathematically as A = -gm * RD.
- -- Transconductance
- A measure of the control of the output current by the input voltage in a transistor, defined as gm = dID/dVGS.
- -- Miller Effect
- A phenomenon in which capacitance at the output of an amplifier appears to be increased at the input when considering feedback.
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