Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-06-15
1996-10-22
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
055680917
ABSTRACT:
A differential amplifier with common-mode rejection for low supply voltages has a first and a second differential pair without transistors in the tails of the differential pairs and with proportional common-mode currents flowing through the first and the second differential pair. The differential amplifier includes a current mirror which feeds the common-mode current of the second differential pair (3, 4) back to the output terminals of the first differential pair for the rejection of common-mode currents at the output terminals. The voltage at the output terminals of the current mirror has a d.c. level which can be established by means of a first reference voltage source independently of the common-mode voltage at the input terminals of the differential amplifier.
REFERENCES:
patent: 4267517 (1981-05-01), Iida et al.
patent: 5032797 (1991-07-01), Mijuskovic
patent: 5361040 (1994-11-01), Barrett
IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988; pp. 750-758, "A 4-MHz CMOS Continous-Time Filter with On-Clip Automatic Tuning", by Krummenacher et al.
Ramalho Joao N. V. L.
Voorman Johannes O.
Franzblau Bernard
Mottola Steven
U.S. Philips Corporation
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