Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-07-21
1996-04-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 74, 327 96, G11C 2702
Patent
active
055107362
ABSTRACT:
The subject of the invention is a differential sampler circuit including a voltage/current converter (1) having two differential inputs (E1a, E1b) and two outputs (S1a, S1b). According to the invention, each of these outputs is linked via an input multiplexer module (2a) to two interposed track-and-hold modules (5a, 6a), in such a way that at any instant one of the track-and-hold modules (5a, 6a) operates in track mode whereas the other (6a, 5a) operates in hold mode. These two modules (5a, 6a) are linked to the output (S4a) of the sampler circuit via an output multiplexer module (7a). This structure makes it possible to double the sampling frequency without increasing the intrinsic speed of the circuit. Each track-and-hold module (5a, 6a) includes an input load (10a, 11a) linked in parallel with a capacitor (C18a, C19a), an output emitter-follower transistor (T20a, T21a), and a switching cell (5-6a). Thus, the high-frequency performance of the circuit is improved.
REFERENCES:
patent: 4982119 (1991-01-01), Tateishi
patent: 5017924 (1991-05-01), Guiberteau et al.
patent: 5039880 (1991-08-01), Astegher et al.
patent: 5130572 (1992-07-01), Stitt et al.
patent: 5298801 (1994-03-01), Vorenkamp et al.
patent: 5349305 (1994-09-01), Hsiao et al.
Vorenkamp et al., "Fully Bipolar, 120-Msamples/s 10-b Track-and-Hold Circuit", IEEE Journal of Solid-State Circuits, vol. 27, No. 7, Jul. 1992, pp. 988-992.
Callahan Timothy P.
Gathman Laurie E.
Nu Ton My-Trang
U.S. Philips Corporation
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