| VTU NOTES | |
|---|---|
|
Subject code |
21EC34 |
|
Semester |
3rd |
BJT Biasing: Biasing in BJT amplifier circuits: The Classical Discrete circuit bias (Voltage-divider bias), Biasing using a collector to base feedback resistor. Small signal operation and Models: Collector current and transconductance, Base current and input resistance, Emitter current and input resistance, voltage gain, Separating the signal and the DC quantities, The hybrid Π model, The T model. MOSFETs: Biasing in MOS amplifier circuits: Fixing VGS, Fixing VG, Drain to Gate feedback resistor. Small signal operation and modeling: The DC bias point, signal current in drain, voltage gain, small signal equivalent circuit models, transconductance, The T equivalent circuit model.
MOSFET Amplifier configuration: Basic configurations, characterizing amplifiers, CS amplifier with and without source resistance RS, Source follower. MOSFET internal capacitances and High frequency model: The gate capacitive effect, Junction capacitances, High frequency model. Frequency response of the CS amplifier: The three frequency bands, high frequency response, Low frequency response. Oscillators: FET based Phase shift oscillator, LC and Crystal Oscillators (no derivation)
Feedback Amplifier: General feedback structure, Properties of negative feedback, The Four Basic Feedback Topologies, The series-shunt, series-series, shunt-shunt and shunt-series amplifiers (Qualitative Analysis). Output Stages and Power Amplifiers: Introduction, Classification of output stages, Class A output stage, Class B output stage: Transfer Characteristics, Power Dissipation, Power Conversion efficiency, Class AB output stage, Class C tuned Amplifier.
Op-Amp Circuits: Op-amp DC and AC Amplifiers, DAC – Weighted resistor and R-2R ladder, ADC- Successive approximation type, Small Signal half wave rectifier, Absolute value output circuit, Active Filters, First and second order low-pass and high-pass Butterworth filters, Band-pass filters, Band reject filters. 555 Timer and its applications: Monostable and Astable Multivibrators.
Overview of Power Electronic Systems: Power Electronic Systems, Power Electronic Converters and Applications. Thyristors: Static Anode-Cathode characteristics and Gate characteristics of SCR, Turn-ON methods, Turn-off Mechanism, Turn-OFF Methods: Natural and Forced Commutation – Class A without design consideration. Gate Trigger Circuit: Resistance Firing Circuit, Resistance capacitance firing circuit, Unijunction Transistor: Basic operation and UJT Firing Circuit.