| 摘要 |
In a chopper stabilized amplifier using FET or other electronic chopper switches, the input chopper switch introduces a frequency dependent error on account of inter-electrode capacitances leading to asymmetrical coupling through the chopper drive waveform. The invention discloses apparatus which modulates the frequency or amplitude of the drive waveform, synchronously demodulates the amplifier output and uses the error signal thus derived to apply corrective feedback at the input to the amplifier. |
