Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2005-07-05
2005-07-05
Nguyen, Khanh V. (Department: 2817)
Amplifiers
Sum and difference amplifiers
C330S252000, C330S260000
Reexamination Certificate
active
06914479
ABSTRACT:
There is disclosed an improved differential amplifier (20) having a feedback loop that generates an amplified output signal (Vout) from an input signal (Vin) supplied by a preceding stage. It comprises an input matching circuit (11) connected to said preceding stage, a buffer (22) and an amplification section (12) connected in series in the direct amplification line, a first amplifier (16), a RC network (17′) and a second amplifier (23) connected in series in a parallel loop between the outputs and the inputs of the amplification section that generate the feedback signal. The role of said buffer and second amplifier associated in a dedicated direct and feedback signal combining block (21) is to respectively isolate the input signal and the feedback signal from the summing nodes (A′,B′) at the amplification section inputs. As a result, the summation of the input signal and the feedback signal is improved, the DC component of the output signal is filtered out in order to significantly reduce the DC offset. In addition, the input impedance matching represented by parameter S11is considerably improved.
REFERENCES:
patent: 5838197 (1998-11-01), Tsukuda
patent: 6313704 (2001-11-01), Maruyama et al.
patent: 6466090 (2002-10-01), Giuroiu
622Mb/s CMOS limiting amplifier with 40 dB dynamic range by T. Yoon & B.Jalali, published in Electronics Letters, Sep. 26, 1996, vol. 32, No. 20, pp. 1920-1921.
Gabillard Bertrand
Girard Philippe
Rivier Michel
Voisin Fabrice
Nguyen Khanh V.
Ulrich Lisa J.
LandOfFree
Differential amplifier with DC offset 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 Differential amplifier with DC offset cancellation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Differential amplifier with DC offset cancellation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3371561