Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Reexamination Certificate
2001-03-27
2004-11-02
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
C327S540000, C330S253000
Reexamination Certificate
active
06812781
ABSTRACT:
Japanese patent application No.2000-98918, filed on Mar. 31, 2000, is hereby incorporated by reference in its entirety.
1. Technical Field
The present invention relates to a differential amplifier having two sets of differential amplifying circuits, a semiconductor device, a power supply circuit, and electronic equipment using the same.
2. Background
A known differential amplifier is shown in
FIG. 7
, which device has two, first and second differential amplifier circuits
200
,
210
. The first and second differential amplifier circuits
200
,
210
are designed to receive first and second input voltages V
IN1
, V
IN2
with an offset therebetween as set at a resistive voltage divider circuit
220
. A P-type MOS transistor
202
is provided at the rear stage of the first differential amplifier circuit
200
, which transistor is driven by a first signal S
1
coming from the first differential amplifier circuit
200
. Similarly an N-type MOS transistor
212
is provided at the rear stage of the second differential amplifier circuit
210
, which transistor is driven by a second signal S
2
from the second differential amplifier circuit
210
. These PMOS transistor
202
and NMOS transistor
212
are operable to pull together thus defining an output voltage V
OUT
.
In this way, in the above mentioned differential amplifier, a specified output voltage V
OUT
is generated and issued by providing the offset to input voltages.
SUMMARY
A differential amplifier as one embodiment comprises:
a first differential amplifier circuit having a first differential pair and operating based on a common input voltage; and
a second differential amplifier circuit having a second differential pair and operating based on the common input voltage,
wherein at least one of the first differential pair and the second differential pair is formed from a pair of transistors having a driving ability difference therebetween.
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Peter Andrews, “Class AB Unity-Gain Buffer Amplifier for CMOS Technology,” MOTOROLA Technical Developments, Jan. 2000, pp. 176-179.
New U.S. Patent Application (Attorney Docket No. 108096), filed Mar. 27, 2001, Tsuchiya.
Cunningham Terry D.
Seiko Epson Corporation
Tra Quan
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