Amplifier circuit
AssigneesSanyo Electric Co., Ltd., Sanyo Semiconductor Co., Ltd.
InventorSatoshi Yokoo
Life of this patent
Estimating the term…
Abstract
In a first operational amplifier, an input signal is input to the negative input terminal, a reference voltage is input to the positive input terminal, a feedback path from the output terminal to the negative input terminal is formed, and the input signal is amplified by a predetermined amplification factor. In a second operational amplifier, an output from the first operational amplifier is input to the positive input terminal, the reference voltage is input to the negative input terminal, and a pair of outputs having opposite polarities to each other and used for performing BTL drive of a load are obtained at the output terminal. Using the above arrangement, a low-frequency signal can be amplified.
Claims5
An amplifier circuit comprising:
- a first operational amplifier in which an input signal is input to a negative input terminal, a reference voltage is input to a positive input terminal, a feedback path from an output terminal to the negative input terminal is formed, and the input signal is amplified by a predetermined amplification factor;
- and
- a second operational amplifier in which an output from the first operational amplifier is input to a positive input terminal, the reference voltage is input to a negative input terminal, and a pair of outputs having opposite polarities to each other are obtained at an output terminal;
- wherein
- a pair of outputs having opposite polarities to each other and configured to perform BTL drive of a load are obtained as outputs of the second operational amplifier,
- wherein a resistor is provided in an input line for inputting the input signal to the first operational amplifier, a feedback resistor is provided in the feedback path, and a resistance ratio of these resistors determines the amplification factor of the first operational amplifier, and
- wherein the input signal is a signal configured to correct for camera shake due to hand movement, and the load is a voice coil motor for carrying out an optical correction.
Dependencies are inferred from the claim text.