Voltage comparator and electronic device
AssigneeSeiko Epson Corporation
InventorsAkira ABE, Yukinari SHIBATA
Life of this patent
Estimating the term…
Abstract
A differential amplifier circuit, a differentiation circuit and an output amplifier circuit are provided. The differential amplifier circuit differentially amplifies differentially inputted signals and provides an output. The differentiation circuit differentiates the output of the differential amplifier circuit, and adds the differentiated output to a bias voltage of a constant current transistor of the output amplifier circuit. A voltage comparator capable of higher speed operation without increasing its current consumption is provided.
Claims13
A voltage comparator comprising:
- a differential amplifier circuit that is configured to differentially amplify differentially inputted signals and provides an output;
- an output amplifier circuit that is configured to amplify the output of the differential amplifier circuit and provides an output;
- and
- a differentiation circuit that is configured to differentiate the output of the differential amplifier circuit,
- a differentiated output of the differentiation circuit being added to a bias voltage of a constant current transistor of the output amplifier circuit.
A voltage comparator comprising:
- a differential amplifier circuit that differentially amplifies differentially inputted signals and provides an output;
- a bias circuit that generates a bias voltage from a constant electric current;
- a differentiation circuit to which the output of the differential amplifier circuit and the bias voltage are applied;
- and
- an output amplifier circuit to which the output of the differential amplifier circuit and an output of the differentiation circuit are applied.
A voltage comparator comprising:
- a differential amplifier circuit that differentially amplifies a first input signal and a second input signal and provides an output;
- a voltage change detection circuit that detects a change amount in the output of the differential amplifier circuit;
- and
- an output amplifier circuit that amplifies the output of the differential amplifier circuit and outputs an amplified signal, wherein
- the voltage change detection circuit is configured to add a voltage based on the charge amount to a voltage of the amplified signal when the output of the differential amplifier circuit increases, and
- the voltage change detection circuit is configure to subtract a voltage based on the charge amount from a voltage of the amplified signal when the output of the differential amplifier circuit decreases.
Dependencies are inferred from the claim text.