Chopper-stabilized amplifiers with a track-and-hold signal demodulator

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 th...

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Bibliographic Details
Published inIEEE transactions on circuits and systems. 1, Fundamental theory and applications Vol. 46; no. 4; pp. 490 - 495
Main Authors Bilotti, A., Monreal, G.
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.04.1999
Institute of Electrical and Electronics Engineers
Subjects
Amplifiers
Applied sciences
Broadband amplifiers
Choppers
Circuit properties
Degradation
Demodulation
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Low pass filters
Low-noise amplifiers
Noise cancellation
Signal to noise ratio
White noise
Waveform
Multiplication
Operational amplifier
Stabilization
White noise
Power spectral density
Demodulator
Performance analysis
Averaging function
Adder
Chopper
Signal to noise ratio
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Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1057-7122
1558-1268
DOI:10.1109/81.754850