Circuit for A/D conversion of a video RF or IF signal

Details Circuit for A/D conversion of a video RF or IF signal Circuit for A/D conversion of a video RF or IF signal

1997-01-04

1998-09-22

Gaffin, Jeffrey A.

Coded data generation or conversion

Converter compensation

341120, 341155, 341156, H03M 106

Patent

active

058120777

ABSTRACT:
There is disclosed an A/D conversion circuit comprising a first A/D converter for receiving an input signal of the A/D conversion circuit and providing a digital output signal, the first A/D converter having a restricted resolution, wherein the input signal passes through delay means to a first input of a subtraction stage. A first D/A converter operating on the output signal of the first A/D converter generates an analog output signal and feeds the analog output signal via an adding stage to a second and subtracting input of the subtraction stage, wherein the input signal of the first D/A converter passes through a correction algorithm unit to a second D/A converter. The output signal of the second D/A converter is fed to a second input of the adding stage, wherein the correction algorithm unit provides empirically determined data for D/A conversion correction. A low pass filter coupled to the output of the subtraction stage provides a low pass filtered and amplified output signal. A sample-and-hold circuit then passes the low pass filtered and amplified output signal of the subtraction stage to the input of a second A/D converter, wherein the first A/D converter and the first D/A converter are controlled by a clock having a frequency which is substantially greater than the frequency of another clock which controls the sample-and-hold circuit and the second A/D converter. A summing stage sums the output signals of the first and second A/D converters to form an output signal of the A/D conversion circuit.

REFERENCES:
patent: 4008468 (1977-02-01), Imhoff et al.
patent: 4502078 (1985-02-01), Steckler et al.
patent: 4875048 (1989-10-01), Shimizu et al.
patent: 4890107 (1989-12-01), Pearce
patent: 4903023 (1990-02-01), Evans et al.
patent: 5105194 (1992-04-01), Mizunoue et al.
patent: 5353027 (1994-10-01), Vorenkamp et al.
Electronic Design, 24 Oct. 1991, Hasbrouck Heights, NJ USA pp. 47-59, XPooo265950 Goodenough, F. "12 Bit IC ADCs Sample Signals At Up To 20 MHz" COpy search report.

Affiliated with

Also associated with

Rating

Circuit for A/D conversion of a video RF or IF signal does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for A/D conversion of a video RF or IF signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for A/D conversion of a video RF or IF signal will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1626363