Reduction of noise in signal from charge transfer devices

Details Reduction of noise in signal from charge transfer devices Reduction of noise in signal from charge transfer devices

1985-03-21

1985-12-03

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 358213, 365183, 365206, 377 60, 377 62, H03K 902

Patent

active

045568510

ABSTRACT:
The noise in the output signal from the floating diffusion output stage of a charge transfer device is reduced. Reset noise can be reduced by resetting the floating diffusion to an in-channel potential, rather than to the reset drain potential. Flicker noise or "1/f" noise in the electrometer stage following the floating diffusion is suppressed by high-pass or band-pass filtering the output signal samples, after which the filtered signal is synchronously detected against a harmonic of the clocking frequency of the charge transfer device to obtain full bandwidth output response. The filtering not only suppresses flicker noise or "1/f" noise, but also suppresses smear that afflicts output signal samples originating from a floating diffusion reset to an in-channel potential.
High frequency peaking of the full bandwidth output response can be obtained with reduced noise, using synchronous detection which does not suppress response to input signal components other than the sidebands of the harmonic of the clocking frequency used as switching carrier frequency. The filtering of the charge transfer device output signal, previous to synchronous detection, is allowed to pass high frequency components from bands outside the harmonic spectrum being synchronously detected. This provides for augmenting the high frequency components of the full bandwidth output response with high frequency components without correlation of their respective attendant noise components.

REFERENCES:
patent: Re30087 (1979-08-01), White et al.
patent: 4309624 (1982-01-01), Hynecek et al.
patent: 4330753 (1982-05-01), Davy
Kosonocky et al., "Basic Concepts of Charge-Coupled Devices", RCA Review, vol. 36, pp. 566-593, Sep. 1975.

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