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Analog System Design in Microelectronic Circuits

Explore analog electronic systems including FM stereo receivers, amplification, and two-port models for amplifiers in microelectronic circuit design. Understand g-parameters and example problems.

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Analog System Design in Microelectronic Circuits

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  1. Chapter 10Analog Systems Microelectronic Circuit Design Richard C. Jaeger Travis N. Blalock Microelectronic Circuit Design, 3E McGraw-Hill

  2. Example of Analog Electronic System: FM Stereo Receiver • Linear functions: Radio and audio frequency amplification, frequency selection (tuning), impedance matching (75- input, tailoring audio frequency response, local oscillator • Nonlinear functions: DC power supply(rectification), frequency conversion (mixing), detection/demodulation Microelectronic Circuit Design, 3E McGraw-Hill

  3. Amplification: Introduction A complex periodic signal can be represented as the sum of many individual sine waves. We consider only one component with amplitude Vs = 1 mV and frequency ws with 0 phase (signal is used as reference): Amplifier output is sinusoidal with same frequency but different amplitude VO and phase : Microelectronic Circuit Design, 3E McGraw-Hill

  4. Amplification: Introduction (cont.) Amplifier output power is: Here, PO = 100 W and RL = 8 W Output power also requires output current which is: Input current is given by phase is zero because circuit is purely resistive. Microelectronic Circuit Design, 3E McGraw-Hill

  5. Amplification: Gain • Voltage Gain: Magnitude and phase of voltage gain are given by and For our example, • Current Gain: Magnitude of current gain is given by Microelectronic Circuit Design, 3E McGraw-Hill

  6. Amplification: Gain (cont.) • Power Gain: For our example, On decibel scale, i.e. in dB Microelectronic Circuit Design, 3E McGraw-Hill

  7. Two-port Models for Amplifiers • Simplifies amplifier-behavior modeling in complex systems. • Two-port models are linear network models, valid only under small-signal conditions. • Represented by g-, h-, y- and z-parameters. • (v1, i1) and (v2, i2) represent signal components of voltages and currents at the network ports. Microelectronic Circuit Design, 3E McGraw-Hill

  8. Microelectronic Circuit Design, 3E McGraw-Hill

  9. Microelectronic Circuit Design, 3E McGraw-Hill

  10. Example: BJT Microelectronic Circuit Design, 3E McGraw-Hill

  11. g-parameters Using open-circuit (i = 0) and short-circuit (v = 0) termination conditions Open-circuit input conductance Reverse short-circuit current gain Forward open-circuit voltage gain Short-circuit output resistance Microelectronic Circuit Design, 3E McGraw-Hill

  12. g-parameters:Example Problem: Find g-parameters. Approach: Apply specified boundary conditions for each g-parameter, use circuit analysis. For g11 and g21: apply voltage v1 to input port and open circuit output port. For g12 and g22: apply current i2 to output port and short circuit input port. Microelectronic Circuit Design, 3E McGraw-Hill

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