46. Common Collector and Common Drain Amplifiers (Contd.): Analysis (Part B)
The chapter discusses the analysis of common collector and common drain amplifiers, focusing on their voltage gain, input resistance, output resistance, and input capacitance. It highlights the significant effects of connected resistors and provides insights into circuit behavior using small signal equivalent models. The chapter also compares the analysis for BJT and MOS transistors, emphasizing how various parameters influence circuit performance.
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What we have learnt
- Common collector and common drain amplifiers exhibit unique behaviors influenced by connected resistances.
- Voltage gain approaches unity in both circuits, regardless of connected external resistances.
- Input capacitance and input resistance are crucial parameters that reflect the performance of amplifiers.
Key Concepts
- -- Common Collector Amplifier
- A type of amplifier configuration where the collector is connected to a constant voltage source, providing high input impedance and low output impedance.
- -- Common Drain Amplifier
- Similar to the common collector, it's a MOSFET configuration known for high input impedance and low output impedance, used primarily as a voltage buffer.
- -- Voltage Gain
- The ratio of output voltage to input voltage, often approximated to be equal to one in common emitter and common drain circuits.
- -- Input Resistance
- The resistance faced by the input signal, which influences how much of the signal is affected by the amplifier's characteristics.
- -- Output Resistance
- The resistance seen from the output of the amplifier, affecting how it drives loads connected to it.
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