摘要:
PROBLEM TO BE SOLVED: To provide a power amplifier circuit capable of improving the symmetric property of transfer characteristics and low voltage operation.SOLUTION: A power amplifier circuit includes: a Gm amplifier; first and second transistors forming a mirror circuit; third and fourth transistors forming a mirror circuit; fifth and sixth transistors forming a mirror circuit; seventh and eighth transistors forming a mirror circuit; a ninth transistor whose one end is connected with a first power supply rail, whose other end is connected with a signal output terminal for outputting an amplified signal and whose control terminal is connected with an inverted output terminal; and a tenth transistor whose one end is connected with a signal output terminal, whose other end is connected with a second power supply rail and whose control terminal is connected with a non-inverted output terminal.
摘要:
PROBLEM TO BE SOLVED: To provide a CMOS operational amplifier circuit which can be operated stably, with low noise and with low current consumption. SOLUTION: A cascode bias voltage of a folded cascode circuit in a CMOS operational amplifier circuit is modulated by a current at an input differential stage so that the CMOS operational amplifier circuit can be operated stably with low noise and at low current consumption. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an operational amplifier which has a simple circuit constitution and is less affected by an offset voltage. SOLUTION: A differential amplifying circuit includes a differential pair and a cascade current mirror circuit forming a load circuit for the differential pair. The cascade current mirror circuit has a first transistor pair having control terminals connected in common, and second and third transistor pairs receiving a bias signal at the common-connected control terminals respectively. The second transistor pair is straight-connected between the first transistor pair, and an input terminal and an output terminal of the cascade current mirror circuit, and the third transistor pair are cross-connected between the first transistor pair, and the input terminal and output terminal of the cascade current mirror circuit. The second transistor pair and third transistor pair have their active states and inactive states controlled by switching bias voltage values respectively such that when one transistor pair are active, the other pair are inactive. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
Provided is a CMOS operational amplifier circuit that can operate with low noise, with low current consumption, and with stability. A cascode bias voltage of a folded cascode circuit in the CMOS operational amplifier circuit is modulated by a current at an input differential stage, thereby enabling operation with low noise, with low current consumption, and with stability.
摘要:
PROBLEM TO BE SOLVED: To provide a display device preventing image quality deterioration even when a panel is enlarged and a vertical synchronizing frequency increases.SOLUTION: The differential amplifier of the display device includes: first and second transistors serially connected between a positive power supply and a negative power supply; an output terminal to which the drains of the transistors are connected in common; an output stage circuit having a first phase compensation capacitance provided between a first current mirror circuit and the output terminal and a second phase compensation capacitance provided between a second current mirror and the output terminal; and a bias control circuit which is provided between an adder circuit and the output stage circuit and performs bias control of the first and second transistors. The output circuit provides short-circuiting between the gate and the source of each of the first and second transistors during a switching period, and charges/discharges the first phase compensation capacitance and the second phase compensation capacitance to a predetermined potential. The bias control circuit cuts off a current path between the first and second transistors.