Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-05-03
2009-12-01
Nguyen, Linh V (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S118000, C341S120000, C341S155000
Reexamination Certificate
active
07626525
ABSTRACT:
A cascaded delta-sigma modulator includes a first stage delta-sigma modulator (10A) having first adder (2) followed by first (3) and second (6) integrators, a second adder (4), and a quantizer (7) the output of which is fed back to the first adder by an A/D (9). A gain circuit (5) is also connected between the first integrator and the second adder. The quantizer output is coupled by interstage circuitry to a second stage converter (100B) having a transfer function represented by the expression OUT(z)=z−nIN(z)+G(z)E2(z). An error cancellation circuit (12) includes inputs coupled to the output of the quantizer and an output of the second stage converter so as to provide a flat transfer function of the cascaded first stage delta-sigma modulator and second stage converter and the error cancellation circuit, despite non-flatness in a transfer function of the first stage delta-sigma modulator.
REFERENCES:
patent: 5061928 (1991-10-01), Karema et al.
patent: 5103229 (1992-04-01), Ribner
patent: 5283578 (1994-02-01), Ribner et al.
patent: 5446460 (1995-08-01), Cabler
patent: 5648779 (1997-07-01), Cabler
patent: 5760722 (1998-06-01), Harris et al.
patent: 5949361 (1999-09-01), Fischer et al.
patent: 6323794 (2001-11-01), Okuda et al.
patent: 6400295 (2002-06-01), Van Herzeele
patent: 6496128 (2002-12-01), Wiesbauer et al.
patent: 6507302 (2003-01-01), Sakimura
patent: 6538588 (2003-03-01), Bazarjani
patent: 6734814 (2004-05-01), Okuda et al.
patent: 6762703 (2004-07-01), Tabatabaei
patent: 6920182 (2005-07-01), Bolton, Jr.
Wang Binan
Zhou Binling
Brady III Wade J.
Nguyen Linh V
Patti John J.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
LandOfFree
Feed-forward circuitry and corresponding error cancellation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feed-forward circuitry and corresponding error cancellation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feed-forward circuitry and corresponding error cancellation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4110580