Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1994-12-02
1996-12-31
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341164, 341118, H03M 138
Patent
active
055898327
ABSTRACT:
A successive approximation circuit and method are disclosed for digitally approximating a moving signal using an analog-digital converter (ADC) and a comparator for generating a comparison signal from the moving signal. An estimate register and a bit and conversion control circuit are provided, with the bit and conversion control circuit including a bit control circuit and a conversion control circuit, where the bit control circuit adjusts a current plurality of output bits to compensate for an error due to a slew rate to generate the digitally approximated moving signal. An adder is included for adding the control value to the current plurality of output bits to generate the next plurality of output bits. Alternatively, an adjustment selection circuit and a logic chain circuit are included. A successive approximation circuit and method are also disclosed for reducing noise in the approximation including a bit tap circuit having a tap converter, which responds to the plurality of output bits and an adjustment circuit for adjusting the bit taps to have reduced noise in the output estimate. The bit tap circuit converts the adjustment signal to an extra least significant bit (LSB) tap of the final plurality of bit taps. Alternatively, the bit tap circuit converts the adjustment signal to a first bit tap corresponding to a most significant bit (MSB) of the plurality of output bits. In another embodiment, the bit tap circuit includes a plurality of AND gates and a plurality of OR gates.
REFERENCES:
patent: 4176344 (1979-11-01), Saari et al.
patent: 4313204 (1982-01-01), DeFreitas
patent: 4544914 (1985-10-01), Chan et al.
patent: 4593270 (1986-06-01), White
patent: 4620179 (1986-10-01), Cooper et al.
patent: 4647903 (1987-03-01), Ryu
patent: 4688018 (1987-08-01), Vaughn
patent: 4707682 (1987-11-01), Brokaw et al.
patent: 4761636 (1988-08-01), Brokaw et al.
patent: 4777470 (1988-10-01), Naylor et al.
patent: 4852130 (1989-07-01), Draxelmayr
patent: 4897658 (1990-01-01), Fujii et al.
patent: 4907002 (1990-03-01), Kawada
patent: 4908624 (1990-03-01), Goto et al.
patent: 4940981 (1990-07-01), Naylor et al.
patent: 4983969 (1991-01-01), Iwamoto et al.
patent: 4985702 (1991-01-01), Penney
patent: 4989004 (1991-01-01), Kanayama
patent: 5092330 (1992-03-01), Duggan
patent: 5107504 (1992-04-01), Nakamura et al.
patent: 5206650 (1993-04-01), Parle et al.
patent: 5235333 (1993-08-01), Naylor et al.
patent: 5258759 (1993-11-01), Cauwenberghs et al.
patent: 5282152 (1994-01-01), Caviasca et al.
patent: 5287108 (1994-02-01), Mayes et al.
patent: 5303177 (1994-04-01), Andre et al.
patent: 5325319 (1994-06-01), Andre et al.
Grundvig Jeffrey P.
Vallancourt David G.
Gaffin Jeffrey A.
Kost Jason L. W.
Lucent Technologies - Inc.
LandOfFree
Low noise non-sampled successive approximation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low noise non-sampled successive approximation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise non-sampled successive approximation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1144779