Fully integrated, ramp generator with relatively long time const

Details Fully integrated, ramp generator with relatively long time const Fully integrated, ramp generator with relatively long time const

1995-03-29

1996-12-17

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Generating sawtooth or triangular output

327132, 327134, 327136, 327140, H03K 406

Patent

active

055857523

ABSTRACT:
A circuit for dividing a reference current is composed of a number n of transistors connected in cascade, in a Darlington configuration, between current generator and a fractionary current output node and by N+k (where k is an integer different from zero) directly biased diodes in series, connected between the generator and the fractionary current output node. The circuit does not employ current mirrors, so all transistors may have the minimum size, which also minimizes the effects of leakage currents. Additionally, compensation elements may be used for compensating the leakage currents from the base regions of the transistors. The circuit is useful as a capacitance multiplier, or as a slow ramp generator in a large number of design situations. Independence from intrinsic parameters of the transistors used and/or from temperature of operation may be provided by employing a specifically designed reference current generator. Several embodiments are described.

REFERENCES:
patent: 3911296 (1975-10-01), Davis
patent: 5126689 (1992-06-01), Nakamura
patent: 5276358 (1994-01-01), Carvajal
"Inexpensive triggered-sweep generator updates recurring-sweep scopes" Woodward Electronic Design 23 Nov. 8, 1976 p. 72.
"Programmable Function Generator" Bigbie et al. IBM Tech Disc. Bul. vol. 20, No. 7 Dec. 1977 pp. 2531-2533.
Hart, "Sawtooth-voltage-waveform generator for extended-duration sweeps." Electronics Letters, vol. 11, No. 3, Feb. 1975, pp. 64-65.
Patent Abstracts of Japan, vol. 9, No. 257 (P-396) 15 Oct. 1985, and JP-A-60 107 185 (Sony KK) 12 Jun. 1985.
Blaesner, "Schaltnetzteile: schneller und sicherer," Elektronik, vol. 38, No. 4, Feb. 1989, Munchen de, pp. 57-64.

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