ELECTRONIC CIRCUIT DESIGN 3

1. Discrete Electronic Circuits

Aims
To introduce the principles of circuit design using discrete transistors.
Objectives Understanding how transistors produce amplification. Why biasing is necessary. The distinction between large-signal and small-signal performance. Analysis and exploration of a range of typical circuit configurations. The factors affecting the frequency response of circuits.
How a conventional operational amplifier is structured. Open and closed loop analysis of circuits including oscillators. The behaviour of MOS switching circuits.

Knowledge

The hybrid-pi model of field effect transistors. How to calculate circuit performance. Simple single-transistor amplifier stages. The properties of Class A, B and AB amplifiers. The differential amplifier. Active voltage and current biasing circuits. Design of oscillators. Application of MOSFET as a simple switch and as a logic gate.

Skills
Ability to analyse and design transistor amplifier circuits, including their input and output resistances, frequency response and dynamic behaviour. Analysis of DC coupled multi-stage transistor circuits. Analysis and design of MOS and CMOS logic gates.

Syllabus
MOSET amplifiers: large and small signal models. Simple biasing arrangements. Performance of common-source and source-follower circuits: voltage and current gain, frequency response, Miller effect.
Analysis and design of DC coupled circuits. Advanced bias circuits - current mirror and cascoding. The differential amplifier and its contribution to the op-amp. Complete op-amp
circuit. Common mode rejection ratio and effect of improved design. Sources of non linearity in amplifiers and impact on design. Oscillator theory and design.
Power amplifiers: Class A, B, and AB amplifiers and their application in op-amp, rf and audio systems.
MOSFETs: I-V characteristics. Hybrid-pi model. MOSFET switching circuits

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