Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-02-17
1994-12-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330261, H03F 345
Patent
active
053714741
ABSTRACT:
A differential amplifier contains a pair of differential portions (10 and 12) that together provide representative signal amplification across the full amplifier power-supply voltage range. Each differential portion normally contains a pair of like-polarity differentially coupled FETs (Q1 and Q2, Q3 and Q4) that divide a tail current (I.sub.N, I.sub.P) into a pair of main currents (I.sub.1 and I.sub.2, I.sub.3 and I.sub.4). The two FET pairs are complementary. A square-root circuit (24) controls the tail currents in such a way that the sum of their square roots is largely constant. Consequently, the amplifier transconductance is largely constant.
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J. H. Huijsing & D. Linebarger, IEEE Journal of Solid-State Circuits, vol. SC-20, No. 6, Dec. 6, 1985, "Low-Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges".
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J. H. Botma et al, "A low-voltage CMOS Op Amp with a rail-to-rail constant-gm input stage and a class AB rail-to-rail output stage", IEEE 1993, International Symposium On circuits And Systems, pp. 1314-1317.
Hogervorst Ron
Huijsing Johan H.
Tero John P.
Wassenaar Roelof F.
Wiegerink Remco J.
Gathman Laurie E.
Mullins James B.
Philips Electronics North America Corporation
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