Amplifiers – With periodic switching input-output
Patent
1977-03-25
1979-02-06
Bahl, Lawrence J.
Amplifiers
With periodic switching input-output
330 51, 330 69, 330303, H03F 102
Patent
active
041386493
ABSTRACT:
A low-level dc amplifier includes a first amplification stage having a pair of direct coupled inputs and a pair of outputs direct coupled to the input side of a second amplifier. A first double-pole, double-throw electronic switch interchanges the two first stage inputs synchronously with a second such switch which interchanges the two first stage outputs. The switches produce at the input of the second amplifier a signal which averages out the first stage's equivalent offset signal. A clock drives the two switches at a preselected clocking frequency. The two clock-driven switches effectively cancel out low frequency (1/f) noise. A filter at the output side of the second amplification stage removes higher frequency noise including clock frequency noise.
REFERENCES:
patent: 2801296 (1957-07-01), Blecher
patent: 3697891 (1972-10-01), Shade
patent: 3892196 (1976-09-01), Poujois
patent: 4048574 (1977-09-01), Barbier et al.
Bahl Lawrence J.
Emerson Electric Co.
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