Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-02-11
1993-05-04
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, 330257, H03F 345
Patent
active
052085520
ABSTRACT:
A transconductance amplifier comprises two complementary differential amplifiers at the input (T1a,T2a; T1b,T2b), the quiescent currents of which are fixed by two current sources (Ia, Ib), respectively. The transconductance amplifier has a first operating range where the two differential amplifiers are active and second and third operating ranges where only one differential amplifier is active. Means (T3a,T4a,Iaa; T3b,T4b,Ibb) are provided for deriving a predetermined fraction of the currents provided by the current sources to the differential amplifiers, the means being respectively in one of the second or third ranges and the predetermined fraction being such that the transconductance of the active transistors in one of the second or third ranges is equal to twice the transconductance of the transistors in the first range.
REFERENCES:
patent: 3497824 (1970-02-01), Goordman
patent: 4555673 (1985-11-01), Huijsing et al.
patent: 4574250 (1986-03-01), Senderowicz
patent: 4851786 (1989-07-01), Vinn et al.
patent: 4887048 (1989-12-01), Krenik
Mullins James B.
SGS-Thomson Microelectronics S.A.
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