Noise and crosstalk reduction in analog to digital encoders

Details Noise and crosstalk reduction in analog to digital encoders Noise and crosstalk reduction in analog to digital encoders

H - Electricity

03

M

354/71

H03M 1/38 (2006.01) H03M 1/00 (2006.01) H04B 14/04 (2006.01)

Patent

CA 1195004

ABSTRACT NOISE AND CROSSTALK REDUCTION IN ANALOG TO DIGITAL ENCODERS A reduction in idle channel noise and crosstalk in a mid-riser-biased successive approximation encoder is achieved through the use of two polarity decisions. Encoder (401) assigns a sampled analog input signal to the closest one of a multitude of discrete signal levels or code steps. A comparator (109) provides this assignment by successive comparisons of the sampled signal with a series of reference signals (110). Each comparison produces a binary digit. The first comparison, or polarity decision, is not transmitted and instead coupled to feedback circuitry (401) to reduce any d.c. component in the analog input signal to substantially zero. A second polarity decision is then made using a non-zero offset reference signal (402) corresponding to an intermediate position on a code step, typically the midpoint. The non-zero offset reference signal is applied along with subsequent reference signals to the comparator to determine the closest code step. The binary digit from the second polarity decision, along with the binary digits representing the code step, are coupled to the encoder output. Accordingly, the encoder is now biased at the intermediate position to substantially reduce the likelihood of idle channel noise and crosstalk enhancement.

386387

Affiliated with

Also associated with

Rating

Noise and crosstalk reduction in analog to digital encoders does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Noise and crosstalk reduction in analog to digital encoders, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Noise and crosstalk reduction in analog to digital encoders will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1336341