US 4,079,238 AGranted

Dual-CCD, real-time, fully-analog correlator

AssigneeWestinghouse Electric Corp.

InventorsDonald Ross Lampe, Marvin Hart White, Hung C. Lin

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Abstract

The proposed general-purpose, fully-analog device is capable of such functions as auto-correlation, cross-correlation, convolution, transversal filters, etc. at high speeds (one megahertz typical sample rates) with no analog-to-digital or digital-to-analog conversions. The device correlates analog samples in one CCD channel against analog samples in a second CCD channel by means of balanced MOSFET's which multiply the associated voltage samples to give current products that are summed for all multipliers. The two CCD channels include unique floating-clock sensor and buffer circuits which sense the CCD charge samples without affecting the efficiency of their propagation along the CCD shift register. The matched MOSFET multipliers and current summing amplifiers are also uniquely combined in a dual-differential configuration so as to minimize the nondestructive sensing and buffering cells and the matched multiplier cells with the longitudinal dimensions of the CCD, permitting the latter to be small for efficient propagation.

Claims8

Dependent claims

An analog correlator comprising:

first and second charge transfer shift register devices each comprising a plurality of successive stages and operable to propagate a charge packet therethrough at a predetermined shift cycle rate,
injector means for injecting a charge packet into each said shift register for propagation therethrough,
means for supplying samples of a signal and of a function to respective said injectors associated with said first and second shift registers for injecting charge packets corresponding thereto for propagation through said respective shift registers,
means for effecting parallel, non-destructive sensing of said charge packets propagating through corresponding stages of said first and second shift registers and for providing corresponding first and second output potential signals representative thereof,
means for multiplying each of the corresponding first and second output potential signals from said sensing means to produce respectively corresponding output product signals indicative of the respective products thereof, and
means for summing the output product signals of said multiplier means for all of said corresponding, respective sensing means of said first and second shift registers.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/625,696Filed 24 Oct 1975
Granted: 14 Mar 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G11C 27/04
Electric analogue stores, e.g. for storing instantaneous values: shift registers
G06G 7/163
For multiplication or division: using a variable impedance controlled by one of the input signals, variable amplification or transfer function
G06G 7/1907
For forming integrals of products, e.g. Fourier integrals, Laplace integrals or correlation integrals; for analysis or synthesis of functions…:…
H03H 2015/026
Transversal filters: matched filters in charge domain