High dynamic range low noise transconductance amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330260, H03F 345

Patent

active

059630922

ABSTRACT:
A differential transconductance amplifier includes two first NPN transistors, whose bases receive a differential input voltage, and whose collectors are coupled to a first supply voltage through two respective first current sources; two second NPN transistors respectively coupling the emitters of the first transistors to a second supply voltage, and whose bases are coupled to the collectors of the respective first transistors through level shifters; and a resistive means coupled between the emitters of the first transistors. Each level shifter includes a third PNP transistor coupled between the collector of the respective first transistor and the base of the respective second transistor, and whose control terminal receives a constant bias voltage independent of the differential input voltage.

REFERENCES:
patent: 4442400 (1984-04-01), Nagano
patent: 4460872 (1984-07-01), Mattisson
patent: 5170133 (1992-12-01), Pernici
patent: 5465070 (1995-11-01), Koyama et al.
patent: 5489876 (1996-02-01), Pernici
French Search Report from 9614898, filed Nov. 29, 1996.

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