Glitchless switched-capacitor biquad low pass filter

Details Glitchless switched-capacitor biquad low pass filter Glitchless switched-capacitor biquad low pass filter

1993-12-02

1995-02-21

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

By integrating

327345, 327554, H03K 500

Patent

active

053919998

ABSTRACT:
A fully differential switched-capacitor biquad low pass filter (40) includes a first stage (54), second stage (56), common-mode circuits (55, 72), and feedback transmission gates (73, 74). The first stage (54) includes a first operational amplifier (47), and the second stage (56) includes a second operational amplifier (69). Glitches, or transients, which are caused by the operational amplifiers (47, 69) operating in slew rate limit mode, are prevented from affecting the differential output signals of the filter (40) when the filter (40) is operating with a continuous time output. This is accomplished by preventing the operational amplifiers (47, 69) from operating in slew rate limit mode, or by adjusting the clock signals such that the output of the filter (40) is not coupled to an operational amplifier (47, 69) that is recovering from operation in slew rate limit mode.

REFERENCES:
patent: 4315227 (1982-02-01), Fleischer
patent: 4438354 (1984-03-01), Haque et al.
patent: 4584532 (1986-04-01), Duehren et al.
patent: 4795987 (1989-01-01), Gay
patent: 4835482 (1989-05-01), Tamakoshi et al.
patent: 4894620 (1990-01-01), Nagaraj
patent: 4924189 (1990-05-01), Senn et al.
patent: 4996529 (1991-02-01), Connell
patent: 5142236 (1992-08-01), Maloberti et al.
patent: 5187445 (1993-02-01), Jackson
A Family of Active Switched Capacitor Biquad Building Blocks (by P. E. Fleischer et al.) vol. 58, No. 10, Dec. 1979.
MOS Switched Capacitor Analog Sampled Data Direct-Form Recursive Filters by Ian Young et al. (IEEE. Journal of Solid State Circuits, vol. SC14, No. 6, Dec. 1979).
Improved Circuits for Realization of Switched Capacitor Filters by Martin (Proceeding of the 1979 International Symposium on Circuits and Sys. Tokyo, Japan 17-19 Jul. 1979).
Stray Sensitive State Space Switched Capacitor Filters (by Masry, IEEE vol. CAS30, No. 7 Jul. 1983).
Switched-Capacitor Circuit Design (by Gregorian et al. IEEE vol. 71, No. 8 Aug. 1983).
A Multiplexers Switched Capacitor Filter Bank (by Bosshart, IEEE vol. SC-15, No. 6 (Nov. 1980).
Continuous-Time MOSFET-C Filters in VLSI. (by Tsividis et al. IEEE vol. SC-21, No. 1, Feb. 1986).
K. Nagaraj et al., "Reduction of Finite-Gain Effect in Switched-Capacitor Filters", Electronics Letters, Jul. 18, 1985, pp. 644-645.
R. Gregorian, "Filtering techniques with switched-capacitor circuits", Microelectronics Journal, vol. 11, No. 2, 1980, pp. 13-21.
R. Gregorian, "Switched-Capacitor Filter Design Using Cascaded Sections", IEEE Transactions on Circuits and Systems, vol. Cas-27, No. 6, Jun. 1980, pp. 515-521.

Affiliated with

Also associated with

Rating

Glitchless switched-capacitor biquad low pass filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Glitchless switched-capacitor biquad low pass filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glitchless switched-capacitor biquad low pass filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1933604