Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1999-03-08
2000-03-14
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including differential amplifier
333 14, H03F 345, H03G 700
Patent
active
060378387
ABSTRACT:
An amplifier with programmable gain and input linearity at high frequency allows an increase in the gain without effecting input linearity and without significantly increasing current consumption. The amplifier includes an input stage which receives a voltage signal for performing a current conversion thereof with compression. An output stage is connected to the input stage and decompresses the signal provided by the input stage for producing gain amplification thereof. The amplifier further includes at least one current amplifier stage interposed between the input stage and the output stage. The at least one current amplifier includes at least one bipolar transistor series-connected to a load diode and to a current source. A reduction in the transconductance of the load diode is provided in the at least one amplifier stage to determine a programmable gain factor for the amplifier.
REFERENCES:
patent: 3895322 (1975-07-01), Stewart et al.
patent: 3972010 (1976-07-01), Dolby
patent: 5589791 (1996-12-01), Gilbert
patent: 5631968 (1997-05-01), Frey et al.
Patent Abstracts of Japan, vol. 095, No. 008, Sep. 29, 1995, and JP 07 135432 A (Sharp Corp), May 23, 1995.
Marchese Stefano
Pisati Valerio
Portaluri Salvatore
Savo Alessandro
Galanthay Theodore E.
Nguyen Patricia T.
Pascal Robert
STMicroelectronics S.r.l.
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