Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1997-02-05
1998-11-17
Ton, My-Trang Nu
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 92, 327 96, G11C 2702
Patent
active
058381759
ABSTRACT:
A low distortion track-and-hold circuit in which a simple, four-transistor amplifier makes the circuit characteristics independent of the source impedance, and compensates for unequal voltage drops caused by mismatched diodes. An additional pair of bipolar transistors is used to eliminate errors caused by switching transients coupled through the diodes. In the track mode, the differential output voltage between two sampling capacitors tracks the differential input voltage of the circuit. At the end of the track time, this differential output voltage is equal to the differential input voltage. During the hold period, the sampling capacitors are isolated from the differential input voltage. The voltages controlling the switching diodes reverse symmetrically during the transition from track to hold, resulting in a cancellation of any feedthrough of the switching transients to the sampling capacitor. Beta and temperature compensation circuits are also included in the differential track-and-hold circuit. In a single-ended in and single-ended out configuration, an operational amplifier can be used to provide a unity-gain buffer and the correct voltage offset. The invention may be implemented using bipolar transistors, MOSFET and JFET technologies.
REFERENCES:
patent: 4879478 (1989-11-01), Gershon
patent: 5036219 (1991-07-01), Dingwall et al.
patent: 5243235 (1993-09-01), Wakayama et al.
patent: 5313113 (1994-05-01), Linder
R. Jewett et al., "WP 2.3: A 12b 20MS/s Ripple-through ADC," 1992 IEEE International Solid-State Conference, Digest of Technical Papers (pp. 34-35), 1992.
Hewlett--Packard Company
Nu Ton My-Trang
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