Track and hold circuit with operating point sensitive...

Details Track and hold circuit with operating point sensitive... Track and hold circuit with operating point sensitive...

2007-05-15

2007-05-15

Tra, Quan (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

C327S095000

Reexamination Certificate

active

11094945

ABSTRACT:
A track and hold (or sample and hold) offset compensated amplifier circuit that performs offset compensation in response to a comparison of sign (or sign and value) of the current forced to the output terminal of operational amplifier in order to keep it at the potential of holding capacitor during the holding phase. Based on this comparison, the comparison circuit increases or decreases the voltage differential applied between the positive and negative input terminals of the operational amplifier depending on whether the comparison circuit detects that the current forced to the output terminal of the operational amplifier is positive or negative. During the holding phase, negative feedback is disconnected, and the positive and negative input terminals of the operational amplifier are connected.

REFERENCES:
patent: 3516002 (1970-06-01), Hillis
patent: 4142117 (1979-02-01), Chang
patent: 4445093 (1984-04-01), Kohler
patent: 4570080 (1986-02-01), Swanson
patent: 4691125 (1987-09-01), Rybicki
patent: 4962325 (1990-10-01), Miller et al.
patent: 5081372 (1992-01-01), Pelgrom
patent: 5506526 (1996-04-01), Seesink
patent: 6608504 (2003-08-01), Fujimoto
“A 10-bit Video BiCMOS Track-and-Hold Amplifier” Mehrdad Nayebi and Bruce A. Wooley IEEE Journal of Solid-State Circuits, vol. 24, No. 6, Dec. 1989.
“An Accurate CMOS Sample-and-Hold Circuit” U. Gattl, F. Maloberti, and G. Palmisano IEEE Journal of Solid State Circuits, vol. 27, No. 1, Jan. 1992.

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