Reference no: EM13139059
Looking at feedback and some Opamp problems
1. If the unity gain frequency is 5 MHz and the midband open-loop voltage gain is 200,000, what is the cutoff frequency?
2. An op amp has a voltage gain of 500,000. If the output voltage is 1V, what is the input voltage?
3. Name a few ICs other than op amps.
4. Above the cutoff frequency, what happens to the voltage gain of the 741C?
5. Describe some of the characteristics of the 741C.
Though in some applications the 741 is a good approximation to an ideal op-amp, there are some practical limitations to the device in exacting applications.
* The input bias current is about 80 nA.
* The input offset current is about 10 nA.
* The input impedance is about 2 Mega Ohms.
* The common mode voltage should be within +/-12V for +/-15V supply.
* The output impedance is about 75 Ohms.
* The voltage gain rolls off 6dB per octave starting at 100kHz.
* There is a finite input offset which must be zeroed by a resistor between pins 1 and 5. The input offset is typically 2mV to <6mV.
* The slew rate is 0.5V/microsecond.
* There is some temperature dependence.
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Explain looking at feedback and some opamp problems
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