Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2006-07-25
2006-07-25
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C327S096000, C327S362000, C330S009000
Reexamination Certificate
active
07081789
ABSTRACT:
A compensated switched capacitor circuit comprises a switched capacitor circuit and a compensation circuit. The compensation circuit generates a reference current that varies under closed loop control to maintain a targeted slew rate for charging a reference capacitor that is determined by the input clock frequency. The switched capacitor circuit's output amplifier is configured such that its output current varies in proportion to the reference current. Thus, by configuring the reference capacitor to track the effective capacitance of the switched capacitor circuit, the settling time of the switched capacitor circuit may be made relatively insensitive to the value of and changes in the effective capacitance over a range of clock frequencies. The compensation circuit may include a clock reconditioning circuit to ensure that the switched capacitor circuit is clocked at a desired duty cycle.
REFERENCES:
patent: 5166630 (1992-11-01), Lee
patent: 5691720 (1997-11-01), Wang et al.
patent: 5909193 (1999-06-01), Phillips et al.
patent: 6073259 (2000-06-01), Sartschev et al.
patent: 6191637 (2001-02-01), Lewicki et al.
patent: 6337601 (2002-01-01), Klemmer
patent: 6417728 (2002-07-01), Baschirotto et al.
patent: 6891439 (2005-05-01), Jaehne et al.
Khoury, “On the Design of Constant Settling Time AGC Circuits,” IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, Mar. 1998, pp. 283-294, vol. 45, No. 3.
Klisnick et al., “Dynamic Frequency Compensation Technique for Switched-Capacitor Amplifiers,” Electronics Letters, Jun. 25, 1998, pp. 1273-1274, vol. 34, No. 13.
Coats & Bennett P.L.L.C.
Le Dinh T.
Telefonaktiebolaget LM Erisson (publ)
LandOfFree
Switched capacitor circuit compensation apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switched capacitor circuit compensation apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switched capacitor circuit compensation apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3573365