Test 1 - 2010.pdf

# An op amp circuit with two input signals v 1 v 2 is

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An op-amp circuit with two input signals V 1 & V 2 is required to give an output voltage ) V 15 V 10 ( V 2 1 o + - = . Design this circuit to use a maximum resistance of 270 k ° and to include “bias current compensation”. Show all relevant calculations and draw the circuit diagram. The op-amp used has unity gain frequency = 1,3 MHz, slew-rate limit = 0,5 V/ ² s, input offset voltage = ±6 mV (max), input bias current = 500 nA (max), and input offset current = 200 nA (max). The dc supply voltages are –9V; 0 V; +9V. (3) 2.2 Determine the maximum dc output voltage expected from this circuit with all inputs grounded. How would this value change if the bias current compensation was omitted? (2) 2.3 Determine the transfer function for input signal V 1 as a function of frequency ( ) 1 o 1 V V TF = and sketch the Bode magnitude frequency response for this input showing relevant numerical details. (4) 2.4 While attempting to measure the frequency response of channel 2, a student connects a sine-wave signal of 0,5 Vrms at 5 kHz to input V 2 and grounds input V 1 . Sketch the expected output waveform and explain any relevant effects that may be observed. (3) 3. A sensor measuring boiler pressure produces a full-scale output signal of 25 mV which is amplified by a three op-amp instrumentation amplifier (IA) to give a full-scale output of 5 V required for input to an A-to-D converter. Determine the gain-setting resistance R G of the IA if all the other resistors are 10 k ° and draw the circuit diagram. The CMRR specification for the IA is 100 dB. If a common mode noise voltage of up to 2 V could develop at the IA input, determine the output error produced as a percentage of full-scale output. (6)

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