Amplifier
AssigneeTexas Instruments Incorporated
InventorTsuyoshi Chimura
Life of this patent
Estimating the term…
Abstract
The object of this invention is to realize high-speed rise and/or fall characteristics for amplifier without increasing transistor size or current consumption. A first rise sensing circuit 42 and a second a sensing circuit 44 are connected to main circuit 40. The first sensing circuit 42 has a PMOS transistor which functions as a rise sensing transistor, a pair of NMOS transistors 48 and 50, which form a current-mirror circuit, and a PMOS transistor 52, which drives the PMOS transistor 46 used for speed up in main circuit 40. The second sensing circuit 44 has a PMOS transistor 54, which functions as a fall sensing transistor, a pair of NMOS transistors 56 and 58, which form a current-mirror circuit, and a PMOS transistor 60 used for driving the PMOS transistor used for speed up in main circuit 40.
Claims8
An amplifier having a differential input part for differentially inputting a pair of input signals,
- an output part which amplifies and outputs the output signal of the aforementioned differential input part,
- a constant-current source circuit which is arranged in the aforementioned differential input part or the output part,
- a first transistor which is turned on when the voltage difference between either of the aforementioned input signals and the output signal of the aforementioned output part exceeds a prescribed value, and
- a second transistor which is turned on when the aforementioned first transistor is turned on and which adds the current that results from the on-state to the constant current generated by the aforementioned constant-current source circuit.
An amplifier having a differential input part for differentially inputting a pair of input signals,
- an output part which amplifies and outputs the output signal of the aforementioned differential input part,
- a charging circuit which is arranged in the aforementioned differential input part or the output part,
- a first transistor which is turned on when the voltage difference between either of the aforementioned input signals and the output signal of the aforementioned output part exceeds a prescribed value, and
- a second transistor which is turned on when the aforementioned first transistor is turned on and which adds the current that results from the on-state to the charging current generated by the aforementioned charging circuit.
An amplifier having a differential input part for differentially inputting a pair of input signals,
- an output part which amplifies and outputs the output signal of the aforementioned differential input part,
- a discharging current arranged in the aforementioned differential input part or output part,
- a first transistor which is turned on when the voltage difference between either of the aforementioned input signals and the output signal of the aforementioned output part exceeds a prescribed value, and
- a second transistor which is turned on when the aforementioned first transistor is turned on and which adds the current that results from the on-state to the discharging current generated by the aforementioned discharging circuit.
Dependencies are inferred from the claim text.