Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-04-06
2008-07-29
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S267000
Reexamination Certificate
active
07405622
ABSTRACT:
A differential amplifier includes an input stage circuit including a first differential pair and a second differential pair which are complementary to each other; a first current mirror circuit connected with the first differential pair and configured to function as an active load; a second current mirror circuit connected with the second differential pair and configured to function as an active load; an output stage circuit having a pair of output transistors connected in series between a higher power supply and a lower power supply; an operation point setting circuit configured to set an operation point of the output transistors; and a floating constant current source connected between an input terminal of the first current mirror circuit and an input terminal of the second current mirror circuit, and configured to supply a constant current. The first current mirror circuit and the second current mirror circuit supply superimpose an output of the input stage circuit on a current corresponding to the constant current by the floating constant current source to supply to the operation point setting circuit.
REFERENCES:
patent: 5311145 (1994-05-01), Huijsing et al.
patent: 61-35004 (1986-02-01), None
Ichimura Motoyasu
Nishimura Kouichi
Shimatani Atsushi
McGinn IP Law Group PLLC
Mottola Steven J
NEC Electronics Corporation
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