Question

Problem 1) [15 marks] The gain of the dual-op-axap instrumentation amplifier shown in Fig. 1 can be adjusted by the variable resistor Ro. The op-amps are ideal. atu Fig. 1 a)Show that v.-2(1 RG )(v2-v.). b Specify suitable components to have a variable gain from 10 to 100 V/V. Problem 2) [15 marks] a) Design an op-amp limiter circuit for amplitude control with the transfer characteristic of Fig. 2(a). Use +-15V DC sources to power the circuit. Assume Vo-0.7 V for diodes. Clearly specify the values of all components. b) Modify the limiter in part (a) to obtain a comparato Problem 3) [10 marks] Consider the op-amp square-wave generator shown. The op-amp voltages are +/-10V a) Sketch voltages ,v.. and v at steady states for two periods. b) Design the circuit to have a period of oscillation of 5 msec. r with transfer characteristic of Fig. 2(b). R2 豈

Answer 1

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