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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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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

current source current mirror active loads
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
differential amplifier

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)

multistage amplifier
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
frequency response of amplifiers

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
negative feedback systems
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

output stages
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

filters tuned amplifiers
Filters & Tuned Amplifiers

Transfer function calculations

Band-edge frequencies and Band-width calculations


Barkhausen condition

R,C Oscillators (WeinBridge, Phase shift)

L,C Oscillators (Colpittsand Crystal)

Analysis using loop-gain concept

Analysis using Nodal Admittance Matrix Equation