Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-01-07
1995-05-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 94, G11C 2702
Patent
active
054184088
ABSTRACT:
A sample-and-hold amplifier in which the held signal is represented as a voltage across a capacitor, but all other signals are represented as currents. At a summing node, the input current and a feedback current are summed to produce a difference current. In the tracking mode, this difference current flows through a closed hold switch onto the input of an integrator. The integrator accumulates the difference current onto the hold capacitor, where it becomes the hold voltage. This hold voltage is converted into a feedback current by a first transconductance amplifier, to provide the negative feedback to the summing node. The hold voltage, which need not equal the input signal, is also applied to the input of a second transconductance amplifier, which provides an output current. The ratio of the two transconductance gains determines the gain accuracy and linearity of the current output. When the hold switch is opened, there is no longer a current path into the hold capacitor, and the output current remains where it was at the moment the switch was opened.
REFERENCES:
patent: 3671782 (1972-06-01), Wittlinger et al.
patent: 4142117 (1979-02-01), Chang
patent: 4302689 (1981-11-01), Brodie
patent: 4370572 (1983-01-01), Cosand et al.
patent: 4672239 (1987-06-01), Thommen
patent: 4691125 (1987-08-01), Rybicki
patent: 4700143 (1987-10-01), Anthony et al.
patent: 4701715 (1987-10-01), Amazawa et al.
patent: 4785250 (1988-11-01), Lawton
patent: 4833345 (1989-05-01), Miller
patent: 4893088 (1990-01-01), Myers et al.
patent: 4959649 (1990-09-01), Akano
Franco, "Use transductance amplifiers to make . . . relationships," Electronic Design 19, Sep. 13, 1976 pp. 98-101.
"Fast-Settling and Hold Circuit", IBM Technical Disclosure Bulletin, vol. 23, No. 12, May '81.
IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, Mehrdan Nayebi and Bruce A. Wooley: "A 10-bit Video BiCMOS Track-and-hold Amplifier", see p. 1508, col. 1-col. 2; FIGS. 1c, 2.
Electronic Design, vol. 36, No. 21, Sep. 1988, Frankgoodenough: "Sampling Amplifiers: The Choice Grows", see p. 65, col. 3-p. 70, col. 3; FIG. 2c.
Electronic Design, vol. 38, No. 2, Jan. 1990, John Sylvan: "Build Precise S/H Amps for Fast 12-Bit ADCS", see p. 58, col. 1; p. 59, col. 3, column 2; FIGS. 1,2.
IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989, Masayuki Ishikawa and Tsuneo Tsukahara: "An 8-bit 50-MHz CMOS Subranging A/D Converter with Pipelined Wide-Band S/H", see p. 1487, col. 2-p. 1488, col. 2; FIG. 6.
IEEE Journal of Solid-State Circuits, vol. 24, No. 5, Oct. 1989, Germano Nicollini: "A Fully Differential Sample-and-Hold Circuit for High-Speed Applications":, see p. 1461-p. 1464.
Mangelsdorf Christopher W.
Mercer Douglas A.
Real Peter
Robertson David H.
Analog Devices Inc.
Callahan Timothy P.
Tran Toan
LandOfFree
Current mode sample-and-hold amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current mode sample-and-hold amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current mode sample-and-hold amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2141883