Programmable analog transversal filter

Details Programmable analog transversal filter Programmable analog transversal filter

1975-12-08

1977-07-05

Ruggiero, Joseph F.

Registers

Transfer mechanism

Traveling pawl

307221D, 328167, 333 70T, 340173R, G11C 1140, H03K 5159

Patent

active

040341992

ABSTRACT:
A programmable analog transversal filter is disclosed for processing analog signals and comprising a charge-coupled device (CCD) for receiving a series of discrete analog signals to be delayed by increasing periods and applied to the outputs of the CCD, and a plurality of MNOS memory devices coupled to the taps of the CCD and programmed so that the output of a CCD tap is multiplied by a particular factor. In turn, the outputs of the MNOS memory devices are summed to provide an output signal ##EQU1## where W.sub.k is the weighting factor associated the k.sup.th MNOS memory device. The weighting factors are set into the system by varying the threshold voltage of the corresponding MNOS device. Positive and negative weighting factors are implemented by using first and second MNOS memory elements for each tap of the CCD, whereby depending upon the program incorporated into the system, one of the first and second MNOS memory devices is programmed to give either a positive weighting factor and the other MNOS memory device a negative weighting factor. Further, a reiterative method of setting the weights into the MNOS memory device is used to compare the system output indicative of the weighting factor as set into the MNOS memory devices, with the desired weighting factor as stored in a suitable storage memory such as a ROM, whereby a correction signal is developed to adjust the threshold voltage V.sub.Th of the MNOS memory device in accordance with the stored weighting factor. In one illustrative embodiment, the weighting factors are set in accordance with sinusoidal signals, whereby the system performs a filtering function to provide an output upon receipt of an input signal of desired frequency. In addition, the MNOS devices are reprogrammable, thus permitting a single such system to be used in many different applications. In this regard, this system is particularly adapted for complex signal processing including filtering, generating desired functions, synthetic aperture radar signal processing and target identification processing.

REFERENCES:
patent: 3518547 (1970-06-01), Filipowsky
patent: 3641512 (1972-02-01), Bentchkowsky
patent: 3763480 (1973-10-01), Weimer
patent: 3809923 (1974-05-01), Esser
patent: 3824564 (1974-02-01), Wegener

Affiliated with

Also associated with

Rating

Programmable analog transversal filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Programmable analog transversal filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Programmable analog transversal filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-579390