Amplifier circuit and input circuit
AssigneeMitsumi Electric Co., Ltd.
InventorsAkihiro Terada, Nagayoshi Dobashi
Life of this patent
Estimating the term…
Abstract
A disclosed amplifier circuit is capable of changing a gain to amplify an input signal according to a control signal. The amplifier circuit comprises a differential amplifier circuit adapted to receive and amplify the input signal to output the amplified input signal as an output signal, a first resistance and one or more second resistances connected to the differential amplifier circuit and adapted to set the gain, and one or more gain control circuits adapted to change the gain by controlling one or more electrical couplings of the one or more second resistances according to the control signal.
Claims6
An amplifier circuit capable of changing a gain to amplify an input signal according to a control signal, comprising:
- a differential amplifier circuit adapted to receive and amplify the input signal to output the amplified input signal as an output signal;
- a first resistance and one or more second resistances connected to the differential amplifier circuit and adapted to set the gain;
- and
- one or more gain control circuits adapted to change the gain by controlling one or more electrical couplings of the one or more second resistances according to the control signal.
An input circuit capable of amplifying and outputting an input signal at a gain suitable for a device connected thereto according to a control signal, comprising:
- a differential amplifier circuit adapted to receive and amplify the input signal to output the amplified input signal as an output signal;
- a first resistance and one or more second resistances connected to the differential amplifier circuit and adapted to set the gain;
- and
- one or more gain control circuits adapted to change the gain by controlling one or more electrical couplings of the one or more second resistances according to the control signal.
Dependencies are inferred from the claim text.