Hold capacitor time delay and integration with equilibrating mea

Details Hold capacitor time delay and integration with equilibrating mea Hold capacitor time delay and integration with equilibrating mea

1991-03-26

1992-09-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

357 30, H01J 4014

Patent

active

051499541

ABSTRACT:
Method and apparatus for performing a TDI function with a plurality of electrical signals. A first step of the method stores, during individual ones of a first plurality of consecutive time intervals, a sample of a first electrical signal. A second step of the method equilibrates, during individual ones of a second, subsequent plurality of time intervals, one of the stored samples with a stored sample of a second electrical signal. Subsequent to each of the steps of equilibrating, an electrical signal is outputted that has a magnitude expressive of the equilibrated stored samples. The equilibration is achieved by shorting storage capacitors (C.sub.1, C.sub.2, C.sub.3) together to effectively sum coherent signals and incoherent noise. The charge sum is stored on a capacitance that is effectively doubled from either detector channel operating individually. The output signal remains in the same range as would be an individual detector channel output voltage, without TDI, and no reduction in dynamic range is incurred.

REFERENCES:
patent: 4300062 (1981-11-01), Marshall, Jr.
patent: 4870293 (1989-09-01), Elabd
patent: 4922337 (1990-05-01), Hunt et al.
patent: 4970567 (1990-11-01), Ahlgren et al.

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