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Topics & Important Concepts ELEC 312 (W11-12)

Topics & Important Concepts ELEC 312 (W11-12). Review of Diode, BJT and MOSFET (ELEC 311 materials). 1. Semiconductor devices 2. I-V equations 3. DC analysis, DC design 4. AC equivalent circuits 5. AC analysis 6. Voltage gain, Input & Output resistances 7. Single stage amplifiers.

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Topics & Important Concepts ELEC 312 (W11-12)

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  1. Topics & Important ConceptsELEC 312 (W11-12)

  2. Review of Diode, BJT and MOSFET (ELEC 311 materials) 1. Semiconductor devices2. I-V equations3. DC analysis, DC design4. AC equivalent circuits5. AC analysis6. Voltage gain, Input & Output resistances7. Single stage amplifiers

  3. Current Source, Current Mirror & Active Loads • Current source using BJT and MOSFET • Design of current source and mirror • Non-idealities • Improved current mirrors • Active loads • Use of active loads in basic amplifiers

  4. Differential Amplifier Large signal operation AC operation with discrete load (fully diff.,balanceddiff.,single in diff. Out, Common mode rejection) AC operation with active load (diff. In single out)

  5. Multistage Amplifier • Operational Amplifier examples • Diff. Amp, CE, CB, CC (CS,CG,CD for MOS) stages • Overall gain calculations – take note of the loading at the inter-stage coupling • Input, output resistance calculations

  6. Concepts of 3dB frequencies, dominant poles • Expressing the gain as • Calculations for high-frequency gain (OCTC, Full Transfer function, use of Miller’s effect principle) • Frequency response of (~relates to transition frequency) • Gain- bandwidth calculations • Compound amplifier stages for improved high frequency (wide-band) response Frequency Responseof Amplifiers

  7. Negative Feedback Systems Basic concept and advantages Four types of feedback connection Two-port circuit and equation models (only three parameters are important) Calculations with ‘loaded’ amplifier (pay attention to proper unit of the loaded gain) Stability in negative feedback Gain margin, phase margin, frequency compensation

  8. Output Stages Requirements of an output stage Different dc Biasing class A and B stages- efficiency, power dissipation Class ab biasing – calculations Different class abconfigurations Heat dissipation considerations

  9. Filters & Tuned Amplifiers Transfer function calculations Band-edge frequencies and Band-width calculations

  10. Oscillators Barkhausen condition R,C Oscillators (WeinBridge, Phase shift) L,C Oscillators (Colpittsand Crystal) Analysis using loop-gain concept Analysis using Nodal Admittance Matrix Equation

  11. Review, Take self test, Practice fast pace writing Good luck

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