Title :
Chopper-stabilized amplifiers with a track-and-hold signal demodulator
Author :
Bilotti, Alberto ; Monreal, Gerardo
Author_Institution :
Electron. Bilotti, Olivos, Argentina
fDate :
4/1/1999 12:00:00 AM
Abstract :
The conventional signal demodulator of a chopper amplifier can be substituted by track-and-hold (T/H) and averaging functions. This arrangement provides offset cancellation without requiring low-pass filters and can ignore the residual offset generated by input spikes. A noise analysis shows that this T/H demodulator degrades the white noise signal-to-noise ratio (SNR), although degradation can be minimized by using maximum duty cycle and minimum amplifier bandwidth
Keywords :
DC amplifiers; choppers (circuits); demodulators; sample and hold circuits; white noise; amplifier bandwidth; averaging functions; chopper-stabilized amplifiers; input spikes; maximum duty cycle; noise analysis; offset cancellation; track-and-hold signal demodulator; white noise signal-to-noise ratio; Broadband amplifiers; Choppers; Degradation; Demodulation; Frequency; Low pass filters; Low-noise amplifiers; Noise cancellation; Signal to noise ratio; White noise;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
