Low noise charge coupled device transversal filter

Details Low noise charge coupled device transversal filter Low noise charge coupled device transversal filter

1978-11-15

1980-11-04

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 333166, 357 24, H03H 728, G11C 1928, H03K 5156, H01L 2978

Patent

active

042322790

ABSTRACT:
A charge coupled device (CCD) transversal filter (TVF) having an improved electrode configuration and connecting arrangement which minimizes the noise that is added to the signal to provide a relatively high amplitude output signal and a relatively high output signal-to-noise ratio. The CCD transversal filter operates with the weighting coefficients determined by the one sided width of the electrodes and with one end of the split electrodes coupled to the output and the other ends of the split electrodes coupled to a reference voltage source. When some of the weighting coefficients of the desired impulse response are negative the output ends of the weighting electrodes are selectively connected to either the inverting or noninverting common connections of a differential amplifier in turn providing the transversal filter output signals. For a single polarity impulse response, all of the electrodes are coupled to an output arrangement without requiring an inversion. In the one sided transversal filter of the invention the net output signal in terms of charge is the same as for a conventional two-sided transversal filter but the electrode area contributing noise is substantially less than in the conventional two-sided arrangement. As the noise charge generated within a bucket is transferred down the channel, it becomes coherent from side to side and the charge added to the signal and sensed on the following electrodes is not reduced in the system of the invention. Because the total electrode capacitance is a function of total electrode area the system provides a significant increase in voltage swing at the output and has a further advantage that the effect of the input noise of the output differential amplifier is also significantly reduced because of the relatively large signal.

REFERENCES:
patent: 3474260 (1969-10-01), Frohbach
patent: 3819958 (1974-06-01), Gosney
patent: 3877056 (1975-04-01), Bailey
patent: 3999152 (1976-12-01), Sato et al.
Sangster-"The Bucket Brigade Delay Line, A Shift Register For Analogue Signals" in Philips Technical Review vol. 37, 1970, No. 4., pp. 97-110.
Buss et al.,-"Transversal Filtering Using Charge Transfer Devices" in IEEE Journal of Solid`-State Circuits, vol. SC-8, No. 2, Apr. 1973; pp. 138-146.
MacLennan-"Signal Processing", Wireless World, Feb. 1975; pp. 61-65.
Ibraham et al.,-"CCD's For Transversal Filter Applications," IEEE IEDM, Washington, D.C. Dec. 1974; pp. 240-243.
Collins et al.,-"Analog Matched Filters Using Charge Coupled Devices," IEEE Nerem 72 Record, Boston, Mass. Oct. 30-Nov. 3, 1972; pp. 155-157.

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