Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1997-01-24
1999-10-05
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327264, 327307, 327489, 330263, 330268, H03F 326
Patent
active
059630655
ABSTRACT:
A low offset amplifier has an output stage constituted by an npn transistor and a pnp transistor in a push-pull arrangement, and a driver stage. The latter includes a current-mirror circuit having, in its input branch, a pnp transistor in series with a first constant-current generator and, in its output branch, an npn transistor, and two complementary bipolar transistors with collectors connected together to the output terminal and the bases are connected together to the input terminal of the amplifier. The emitter of the pnp transistor of the driver stage is connected to the positive terminal of the supply by a second constant-current generator and to the base of the npn transistor of the output stage, and the emitter of the npn transistor of the driver stage is connected to the negative terminal of the supply by the npn transistor of the output branch of the current-mirror circuit and to the base of the pnp transistor of the output stage. The amplifier has a very low or zero offset (Vos=Vout-Vin).
REFERENCES:
patent: 4893091 (1990-01-01), Lillis et al.
patent: 5057790 (1991-10-01), Landi
patent: 5546048 (1996-08-01), Sano et al.
Patent Abstracts of Japan, vol. 001, No. 088 (E-036), Aug. 16, 1977 & JP-A-52 023246 (Sony Corp.).
Alini Roberto
Bruccoleri Melchiorre
Cosentino Gaetano
Pisati Valerio
Callahan Timothy P.
Consorzio per la Ricerca sulla Microelettronica nel Mezzogiorno
Englund Terry L.
SGS--Thomson Microelectronics S.r.l.
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