# Operational Amplifier Circuits by Brian C.J. Moore and John Donaghy (Auth.)

By Brian C.J. Moore and John Donaghy (Auth.)

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Additional info for Operational Amplifier Circuits

Example text

So full power bandwidth for the 741C will be about , 0-5 x 106 T I FPB = 5-684 kHz . Example 7 Calculate the full power bandwidth (FPB) of an operational amplifier operating from ±15 V supply rails, if it saturates within 2 volts of these rails and has a maximum slew rate of 0-8 ν/μβ. 11 Slew rate limiting of square wave input In essence, slew rate limiting is the result of a limit in the ability of the internal circuitry of an operational amplifier to drive capacitive loads, either internal or external.

The fall in gain at high frequencies is due to internal active device capacity tending to short the signal to ground, whilst the phase lag is due to the input, output and interstage coupling capacitors. 5. 13. If \in in a step function of amplitude E, the output voltage, v 0 , will be: v 0 = AE(1 - e - / C R ) . 15 Problems for readers Example 10 An operational amplifier, with open loop cut-off frequency equal to 10 Hz, is used in a non-inverting circuit with closed loop voltage gain of 12. With a square wave input signal, the output rise time is measured as 7 jxs.

Example 7 Calculate the full power bandwidth (FPB) of an operational amplifier operating from ±15 V supply rails, if it saturates within 2 volts of these rails and has a maximum slew rate of 0-8 ν/μβ. 11 Slew rate limiting of square wave input In essence, slew rate limiting is the result of a limit in the ability of the internal circuitry of an operational amplifier to drive capacitive loads, either internal or external. The capacitance that limits the slewing ability is generally the compensation capacitance, although in some instances, it is the load capacitance.