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The gain and frequency response of an amplifier in a feedback system is made independent of its operating point by using a second amplifier to buffer the reference voltage for the first amplifier.
English (United States)
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Amplifier With Gain and Frequency Response Independent of Operating
The gain and frequency response of an amplifier in a feedback system is
made independent of its operating point by using a second amplifier to buffer the
reference voltage for the first amplifier.
Operational amplifiers are used to establish loop gain and add frequency
compensation in feedback systems, e.g., switching regulators. In a switching
regulator application, the DC operating point of the operational amplifier must be
adjusted to vary the output voltage of the regulator. Conventionally, the
operating point of such an amplifier is varied by adjusting either a feedback
resistor or an input resistor in the reference voltage circuit for the amplifier.
Changing either resistor has the undesirable effect of changing the loop gain and
The circuit shown in the drawing allows the operating point of an operational
amplifier 10 to be adjusted without changing the loop gain or frequency
response. The feedback resistor 12, input resistors 14 and 16 and input
capacitor 18 have fixed values.
The DC operating point of amplifier 10 is adjusted by a circuit including a DC
amplifier 20 having an adjustable feedback resistor 22 and an input resistor 24
connected to ground. A reference voltage is applied to the non-inverting input of
amplifier 20. The output impedance of amplifier 20 is very low and is essentially
constant with the operating point. The impedances of the resistors 14...