公开(公告)号：DE69624460D1

公开(公告)日：2002-11-28

申请号：DE69624460

申请日：1996-01-26

Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

Inventor： ALINI ROBERTO ,  BRUCCOLERI MELCHIORRE ,  COSENTINO GAETANO ,  PISATI VALERIO

IPC: H03F3/30 ,  H03F3/34 ,  H03F1/00

Abstract: The amplifier described has an output stage constituted by an npn transistor (Q1) and a pnp transistor (Q2) in a push-pull arrangement, and a driver stage. The latter comprises a current-mirror circuit having, in its input branch, a pnp transistor (Q3) in series with a first constant-current generator (G1) and, in its output branch, an npn transistor (Q4), and two complementary transistors (Q5 and Q6) of which the collectors are connected together to the output terminal (OUT) and the bases are connected together to the input terminal (IN) of the amplifier. The emitter of the pnp transistor (Q5) of the driver stage is connected to the positive terminal (vdd) of the supply by means of a second constant-current generator (G2) and to the base of the npn transistor (Q1) of the output stage, and the emitter of the npn transistor (Q6) of the driver stage is connected to the negative terminal (gnd) of the supply by means of the npn transistor (Q4) of the output branch of the current-mirror circuit and to the base of the pnp transistor (Q2) of the output stage. The amplifier has a very low or zero offset (Vos = Vout-Vin).

公开(公告)号：DE69426776D1

公开(公告)日：2001-04-05

申请号：DE69426776

申请日：1994-12-27

Applicant: ST MICROELECTRONICS SRL ,  CONS RIC MICROELETTRONICA

Inventor： BRUCCOLERI MELCHIORRE ,  COSENTINO GAETANO ,  DEMICHELI MARCO ,  PORTALURI SALVATORE

IPC: G06G7/16 ,  G06G7/163

Abstract: The error on the output signal produced by an analog multiplier comprising at least a differential output stage formed by a pair of emitter-coupled bipolar transistors (Q3, Q4), each driven by a predistortion stage (Q1, Q2) having a reciprocal of a hyperbolic tangent transfer function, attributable to the base currents of the bipolar transistors used, is compensated by generating replicas of the base current of the bipolar transistors (Q3, Q4) of said differential stage and forcing said replica currents on the output node of the respective predistortion stage (Q1, Q2). Various embodiments of different dissipative behaviours are described.

公开(公告)号：ITMI982076A1

公开(公告)日：2000-03-27

申请号：ITMI982076

申请日：1998-09-25

Applicant: ST MICROELECTRONICS SRL

Inventor： PALMISANO GIUSEPPE ,  FILORAMO PIETRO ,  COSENTINO GAETANO

IPC: G05F3/26

Abstract: A current mirror circuit is provided with recovery having high output impedance. The current mirror includes a differential stage having a pair of transistors, and a voltage feedback loop which is stabilized and closed on a first one of the transistors of the differential stage. A second one of the transistors of the differential stage is connected, by its base terminal, to the collector terminal of an output transistor and, by its collector terminal, to the supply voltage. Moreover, the circuit includes a positive feedback loop which has the second transistor of the differential stage and the output transistor. A low-impedance circuit branch is connected to the base terminal of the second transistor of the differential stage and to the collector terminal of the output transistor.