Amplifier arrangement

Details Amplifier arrangement Amplifier arrangement

1991-03-12

1992-05-12

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330259, 307494, H03F 345

Patent

active

051131463

ABSTRACT:
An amplifier arrangement includes a transistor differential pair (N1, N2) having an input terminal (3) and an output terminal (4). The transistor differential pair is coupled to a current mirror (P1, P2). A first level shifting circuit (6) and a second level shifting circuit (7) stabilize the d.c. voltage levels on the mutually coupled main electrodes of the differential pair (N1, N2) and the current mirror (P1, P2) respectively. Consequently, the influence of the Early-effect on the differential pair is suppressed and an improved linear signal transmission is obtained from the input terminal (3) to the output terminal (4). The level shifting circuit (6) also provides a base current compensation in order to produce a high input impedance and the second level shifting circuit (7) provides a base current compensation for equal adjusting currents through the differential pair to reduce any offset voltage.

REFERENCES:
patent: Re29700 (1978-07-01), van de Plassche
patent: 4223276 (1980-09-01), Nagano
patent: 4258331 (1981-03-01), Nakayama
patent: 4338527 (1982-07-01), Nagano

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