Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Reexamination Certificate
2006-04-25
2006-04-25
Tran, Khai (Department: 2637)
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
C375S318000, C375S319000, C375S324000, C375S293000, C455S296000, C327S058000, C327S069000
Reexamination Certificate
active
07035349
ABSTRACT:
A signal compensation circuit compensates for direct-current offset of an input signal by amplifying the input signal with an amplifier having a variable direct-current offset. A low-speed negative feedback loop charges and discharges a capacitor in an integrating circuit according to the direct-current component of the amplified signal. A high-speed negative feedback loop charges and discharges the same capacitor at a faster rate when the amplified signal goes outside an allowable amplitude range. The capacitor potential is used to control the direct-current offset of the amplifier. The allowable amplitude range is adjusted according to the amplitude of the amplified signal. High-speed compensation can thus be combined with a tolerance for runs of identical code levels in the input signal.
REFERENCES:
patent: 4272845 (1981-06-01), Fiumani
patent: 4535294 (1985-08-01), Ericksen et al.
patent: 4571547 (1986-02-01), Day
patent: 5369470 (1994-11-01), Hansen
patent: 5412692 (1995-05-01), Uchida
patent: 6104238 (2000-08-01), Mattisson et al.
patent: 6668162 (2003-12-01), Murtojarvi
Horikawa Akira
Matsumoto Shuichi
Yoshida Akira
Chang Edith
Oki Electric Industry Co, Ltd.
Sartori Michael A.
Tran Khai
LandOfFree
Signal compensation circuit and demodulating circuit with... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal compensation circuit and demodulating circuit with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal compensation circuit and demodulating circuit with... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3570846