63. Multi-Transistor Amplifiers: Cascode Amplifier (Contd.) – Numerical Examples (Part A)
The chapter focuses on Multi-Transistor Amplifiers, particularly the Cascode Amplifier, with an emphasis on numerical examples using both BJT and MOSFET technologies. Key aspects covered include the analysis of operating points, small signal parameters, voltage gain, and input capacitance. A detailed comparison of the cascode amplifier with common emitter amplifiers highlights the advantages of using cascode configurations.
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Sections
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What we have learnt
- The operation principles of cascode amplifiers and their configurations using BJTs and MOSFETs.
- The methods for calculating operating points and small signal parameters of transistors within amplifier circuits.
- The impact of input capacitance on bandwidth and overall gains in different amplifier configurations.
Key Concepts
- -- Cascode Amplifier
- A multi-transistor amplifier configuration that improves bandwidth and gain by stacking two amplifiers.
- -- Operating Point
- The DC conditions of an amplifier circuit, including voltage and current levels that ensure transistors operate in their desired regions.
- -- Small Signal Parameters
- Parameters such as transconductance (g_m) and output resistance (r_o) that define the behavior of transistors under small signal conditions.
- -- Voltage Gain
- The ratio of output voltage to input voltage in an amplifier, indicative of amplification capability.
- -- Input Capacitance
- Capacitance looking into the input of an amplifier, impacting frequency response and bandwidth.
Additional Learning Materials
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