Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-08-04
1996-07-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 96, 327374, 327579, G11C 2702
Patent
active
055326293
ABSTRACT:
A track and hold circuit including an input terminal V.sub.IN, a first node, a second node and a capacitor C.sub.H. A diode D connects between the first node and the input terminal V.sub.H. Circuitry coupled to the first node makes the diode conductive during track mode of operation, indicated by a clock CK being at a first state, and non-conductive during hold mode of operation, indicated by a clock CK being at a second state. A transistor Q3 is coupled between said first node and said second node. The capacitor C.sub.H is connected to said second node. The transistor Q3 is operative to charge the capacitor C.sub.H during track mode and to isolate the capacitor C.sub.H from the input terminal V.sub.IN during hold mode. Additional circuitry coupled to said transistor Q3 senses the clock shifting from said first to said second state to rapidly discharge the inherent base/emitter capacitor of the transistor Q3 to thereby cause rapid turn off of the transistor Q3.
REFERENCES:
patent: 3643169 (1972-02-01), Klein
patent: 4890009 (1989-12-01), Miyazaki et al.
patent: 5315168 (1994-05-01), Norton, Jr.
patent: 5343084 (1994-08-01), Gens
patent: 5391936 (1995-02-01), Soh
patent: 5410195 (1995-04-01), Ichihara
Callahan Timothy P.
Crane John D.
Donaldson Richard L.
Kesterson James C.
Texas Instruments Incorporated
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