67. Multi-Transistor Amplifiers : Amplifier With Active Load (Part B)
The chapter discusses the operation and analysis of multi-transistor amplifiers with active load, focusing on common source and common emitter configurations. It highlights the implications of using active loads on voltage gain and output resistance compared to passive loads. In-depth examples illustrate how these configurations enhance circuit performance and maintain operational stability.
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What we have learnt
- Active loads in amplifiers can enhance voltage gain significantly compared to passive loads.
- Properly balanced currents in transistors are essential for stable operation and gain in multi-transistor amplifiers.
- The slope of load line characteristics affects the overall gain and output resistance in amplifier circuits.
Key Concepts
- -- Voltage Gain
- The ratio of output voltage to input voltage, fundamental in determining amplifier performance.
- -- Transistor Current Matching
- The condition where the currents of two transistors in a circuit are equal, necessary for optimal amplifier operation.
- -- Active Load
- A load that employs an active device (like a transistor) to enhance amplifier characteristics, such as gain and bandwidth.
- -- Output Resistance
- The resistance seen by the load connected to the output, impacting the voltage swing and bandwidth of the amplifier.
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