H - Electricity – 03 – H
Patent
H - Electricity
03
H
354/95, 328/0.4
H03H 7/00 (2006.01) H03H 15/02 (2006.01) H04L 27/10 (2006.01) H04L 27/144 (2006.01)
Patent
CA 1111509
ABSTRACT OF THE DISCLOSURE 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 con- junction 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 capa- citors having values selected such that a sine wave having mini- mal 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.
306446
Kirby Eades Gale Baker
Texas Instruments Incorporated
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