Commutating capacitive envelope detector

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

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328167, 333 20, H03H 710, H03H 714

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042245826

ABSTRACT:
The peak output of a commutating capacitor triplet device (201) which contains three capacitors (10, 11, 12) connected in pairs across an input signal to provide six samples of each signal cycle, is obtained to provide envelope detection. To reduce output ripple by increasing the number of samplings of each cycle without increasing the number of capacitors, a portion of the output is obtained at the junction (13) of the capacitors, the amplitudes of the output and portion thereof are weighted with respect to each other by resistors (204, 205) and combined. In one embodiment, the positive and negative parts of the combined signal are applied to a full wave rectifier (207, 208, 214). In another embodiment, the positive and negative parts of the portion are inversely combined (306, 307, 308) prior to the portion being combined with the output of the triplet device.

REFERENCES:
patent: 1626634 (1927-05-01), Slepian
patent: 3403345 (1968-09-01), Frank et al.
patent: 3729695 (1973-04-01), Condon
patent: 3758884 (1973-09-01), Bahler et al.
patent: 3795877 (1974-03-01), Poole

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