Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-12-20
2005-12-20
Shingleton, Michael B. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S252000, C330S253000, C330S261000, C330S288000, C327S563000
Reexamination Certificate
active
06977549
ABSTRACT:
A differential circuit and an amplifier circuit for reducing an amplitude difference deviation, performing a full-range drive, and consuming less power are disclosed. The circuit includes a first pair of p-type transistors and a second pair of n-type transistors. A first current source and a first switch are connected in parallel between the sources of the first pair of transistors, which are tied together, and a power supply VDD. A second current source and a second switch are connected in parallel between the sources of the second pair of transistors, which are tied together, and a power supply VSS. The circuit further includes connection changeover means that performs the changeover of first and second pairs between a differential pair that receives differential input voltages and a current mirror pair that is the load of the differential pair. When one of the two pairs is the differential pair, the other is the current mirror pair. In a differential amplifier circuit, there is provided an added transistor connected in parallel to a transistor, which is one transistor of a differential pair transistors, whose control terminal is a non-inverting input terminal. The added transistor has a control terminal for receiving a control voltage which is set so that, when an input voltage applied to the non-inverting input terminal is in a range in which the transistor whose control terminal is the non-inverting input terminal is turned off, the added transistor is turned on.
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Japanese Office Action dated Mar. 29, 2005, with partial English translation.
McGinn IP Law Group PLLC
NEC Corporation
Shingleton Michael B.
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