Charge coupled device filters and modems incorporating such filt

Details Charge coupled device filters and modems incorporating such filt Charge coupled device filters and modems incorporating such filt

1977-06-30

1982-06-22

Chin, Tommy P.

Pulse or digital communications

Repeaters

Testing

375 80, 375 82, 455266, 333 18, 333193, H04L 2710

Patent

active

043366139

ABSTRACT:
A Modem utilizing process technology compatible CCD and IGFET circuits and sub-systems incorporated on a single I.C. chip. CCD transversal filters are employed as bandpass filters, being tuned for different modes of operation by adjustment of the clock frequency. The bandpass filters are operated in conjunction with a charge amplifier to remove d.c. offset from the analog output of the filters. The demodulator section of the Modem also incorporates low-pass filter employing switched resistors. The modulator section includes waveform generators based on a digital-to-analog converter including switched capacitors having values selected such that a sine wave having minimal distortion is generated when switched in proper sequence. Provision is made for digital inputs to control the frequency and amplitude of the sine wave output. The Modem can be operated under control of a microprocessor.

REFERENCES:
patent: 3832637 (1974-08-01), Alexander et al.
patent: 3879664 (1975-04-01), Monsen
patent: 3902165 (1975-08-01), Artom
patent: 3909527 (1975-09-01), Ohta et al.
patent: 3942034 (1976-03-01), Buss
patent: 3943448 (1976-03-01), Motley et al.
patent: 3978407 (1976-08-01), Forney, Jr.
patent: 3999152 (1976-12-01), Sato et al.
patent: 4132950 (1979-01-01), Cochran et al.

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