Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1999-07-22
2000-11-21
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330255, H03F 345
Patent
active
061508837
ABSTRACT:
A differential amplifier includes a rail-to-rail input stage including differentially coupled first (13) and second (14) P-channel input transistors, and differentially coupled third (17) and fourth (18) N-channel input transistors. The drains of the first and second input transistors are coupled to a first folded cascode circuit which includes first (25) and second (26) P-channel cascode transistors. The drains of the third and fourth input transistors are coupled to a second folded cascode circuit which includes third (36) and fourth (37) N-channel cascode transistors. An output stage includes a P-channel pull-up transistor and an N-channel pull-down transistor and a class AB bias circuit coupled between the gates thereof. The gates of the first (25) and third (36) cascode transistors are coupled to first and second reference voltages, respectively. A first gain boost circuit (58) amplifies signals on the drains of first and second input transistors to produce a bias signal on the gate of the second cascode transistor (26) coupled to the gate of the pull-up transistor. A second gain boost circuit (57) amplifies signals on the drains of third and fourth input transistors to produce a bias signal on the gate of the fourth cascode transistor (37) coupled to the gate of the pull-down transistor.
REFERENCES:
patent: 5337008 (1994-08-01), Badyal
patent: 5515003 (1996-05-01), Kimura
patent: 6043708 (2000-03-01), Barr
patent: 6052025 (2000-04-01), Chang et al.
Burr-Brown Corporation
Mottola Steven J.
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