A 1kV/V 60dB
β 100mV/V 1/10 -20dB
Aβ: Loop gain 40dB
G: Closed loop gain 20dB ≒ 1/β
Input signal 1kHz 100mV
Output signal 1.0V
Noise in loop is 5kHz 2Vpp
5kHz noise is redused (40dB=Aβ) 20mVpp
1V/V opeamps are idial substractor.
Blue: Input signal
Green: Output voltage
Yellow: Error output voltage
