Amplifier circuit
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsKen-ichi Uto, Kuniaki Motoshima
Life of this patent
Estimating the term…
Abstract
The amplifier circuit includes differential amplifier circuits (3 to 4); a peak detector circuit (7) for detecting a peak value of an output voltage of a differential amplifier circuit 4 of the last stage; an offset compensation voltage generator circuit (8) for generating an offset compensation voltage for offset compensation on the basis of a detection result of the peak detector circuit (7); and an offset output limiter circuit (9) for limiting the offset compensation voltage generated by the offset compensation voltage generator circuit (8) into a predetermined range and feeding back the limited offset compensation voltage to a differential amplifier circuit (3) of the first stage.
Claims7
An amplifier circuit comprising:
- a differential amplifier unit which includes one or more differential amplifier circuits;
- a detector unit which detects a peak value of an output voltage of the differential amplifier unit;
- a generator unit which generates an offset compensation voltage for offset compensation based on a detection result of the detector unit;
- and
- a limiter unit which limits the offset compensation voltage generated by the generator unit into a predetermined range and feeds back the limited offset compensation voltage to the differential amplifier unit, wherein the detector unit detects the peak value and an intermediate value of the output voltage of the differential amplifier unit, generates a first reference voltage by adding a predetermined external voltage to a voltage of the intermediate value, and outputs the peak value and the first reference voltage to the generator unit,
- the generator unit generates the offset compensation voltage based on the peak value and the first reference voltage to the generator unit voltage fed from the generator unit.
A method of amplifying a signal through an amplifier circuit comprising:
- applying said signal to a differential amplifier unit which includes one or more differential amplifier circuits;
- detecting a peak value of an output voltage of the differential amplifier unit using a detector unit;
- generating an offset compensation voltage for offset compensation based on a detection result of the detector unit using a generator unit;
- and
- limiting the offset compensation voltage generated by the generator unit into a predetermined range using a limiter unit, and feeding back the limited offset compensation voltage to the differential amplifier unit, wherein:
- the detector unit detects the peak value and an intermediate value of the output voltage of the differential amplifier unit, generates a first reference voltage by adding a predetermined external voltage to a voltage of the intermediate value, and outputs the peak value and the first reference voltage to the generator unit, and
- the generator unit generates the offset compensation voltage based on the peak value and the first reference voltage to the generator unit voltage fed from the generator unit.
An amplifier circuit comprising:
- a differential amplifier unit which includes one or more differential amplifier circuits;
- a detector unit for detecting a peak value of an output voltage of the differential amplifier unit;
- a generator unit for generating an offset compensation voltage for offset compensation based on a detection result of the detector unit;
- and
- a limiter unit for limiting the offset compensation voltage generated by the generator unit into a predetermined range and feeds back the limited offset compensation voltage to the differential amplifier unit, wherein:
- the detector unit detects the peak value and an intermediate value of the output voltage of the differential amplifier unit, generates a first reference voltage by adding a predetermined external voltage to a voltage of the intermediate value, and outputs the peak value and the first reference voltage to the generator unit, and
- the generator unit generates the offset compensation voltage based on the peak value and the first reference voltage to the generator unit voltage fed from the generator unit.
Dependencies are inferred from the claim text.