Electronic Circuits 2 (Control) ELEX 3320

SMALL SIGNAL MODELS FOR THE BIPOLAR JUNCTION TRANSISTOR

• Draw and understand small signal equivalent circuits for bipolar junction transistors.
• Describe qualitatively the operation of a bipolar transistor.
• Draw the AC small signal equivalent circuit for a common emitter amplifier and hence calculate input and output resistances and voltage gain. Draw the hybrid pi equivalent circuits of a bipolar transistor.
• Convert between hybrid pi equivalent circuits.

DIFFERENTIAL AMPLIFIERS

• Design, build and test differential amplifiers.
• Explain qualitatively the operation of a differential amplifier.
• Given the circuit parameters, calculate differential gain, common mode gain and common mode rejection ratio using the hybrid -p p equivalent circuit.
• Show by calculation the improvement in CMRR that results from using a current mirror for the tail current supply.

OPERATIONAL AMPLIFIERS - DEVICE CHARACTERISTICS

• Design, build and test inverting and non-inverting op-amp configurations.
• Recognize op-amp linear amplifier circuits as feedback amplifiers and apply the feedback equation.
• Explain and define: virtual ground, input offset voltage, input offset current, input bias current, slow rate, bandwidth, rise time, gain-bandwidth product, open loop gain, closed loop gain, common mode rejection ratio, common mode range.
• Read an apply spec sheet data.
• Draw schematics and calculate input resistance, output resistance and gain for the inverting and non-inverting configurations.
• Calculate bandwidth, rise time, power bandwidth, input resistance and output resistance for a given circuit.

OPERATIONAL AMPLIFIERS - CIRCUITS AND APPLICATIONS

• Design, build and test various circuits such as comparators and classical absolute value circuits using op-amps.
• Design, build and test instrumentation amplifiers.
• Design, build and test differentiators and integrators.
• Analyze differentiator and integrator circuits using s-plane techniques.
• Define and explain: low-pass, high-pass, and band-pass filters.
• Define order of a filter.
• Design, build and test VCVS high-pass, low-pass, and band-pass filters.
• Make frequency response graphs for a given filter function using the Bode plot approximation.
• Design, build and test comparators, absolute value circuits and simple function generator circuits.

PHASE LOCKED LOOPS

• Design, build and test phase locked loop systems.
• Draw block diagram of phase locked loop.
• Recognize the phase locked loop as a feedback system.
• Define and explain Phase Detector Constant and Oscillator Constant.
• Explain feedback action loop.
• Perform steady state analysis of loop.
• Perform a transient analysis of the loop with no filter.
• Perform a frequency response analysis of the loop with no filter.
• Explain the need for a first order loop filter.
• Write the second order loop transfer function.
• Design a suitable first order loop filter given the required response.
• Design and test phase locked loop systems such as those used in FSK demodulators.

FEEDBACK AMPLIFIERS

• Design, build and test feedback amplifiers.
• Draw basic feedback amplifier circuits.
• Distinguish between voltage and current feedback.
• Distinguish between series and shunt feedback.
• Calculate the gain of a given feedback amplifier.
• Calculate the input and output impedances of a given feedback amplifier.
• Calculate the bandwidth of a given feedback amplifier.

USE OF S-PLANE

• Construct s-plane models of electrical and mechanical systems and derive system performance information for the models.
• Develop transfer functions for elementary circuits and machines.
• Apply s-plane analysis techniques to circuit problems.
• Derive the steady-state sine wave response.
• Plot frequency and step response of elementary circuits given the transfer function.

POSITION CONTROL SERVO SYSTEMS

• Design, build and test position control servo systems.
• Understand, set up and use the transfer function of a permanent magnet dc motor with an intertial load.
• Make a block diagram of a simple position control servo system.
• Put the appropriate transfer functions in each block.
• Derive the s-plane system transfer function.
• Predict the system response to various input functions.
• Recognize the order of a feedback system.
• For a second order system, explain the significance of and use appropriately:
• - natural frequency
• - damping ratio
• - damped frequency
• - overshoot
• - risetime
• - under, over, and critical damping
• - effect of pole placement on system stability.
• Use rate feedback to accomplish reduction in overshoot.
• Design and test a second order position control system.

Effective as of Winter 2005