Loop gain adjusting circuit
AssigneeON Semiconductor Trading, Ltd.
InventorHideki Hirayama
Life of this patent
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Abstract
In an adder circuit, a sine wave is added to a compensation signal which is generated based on a position detection signal of a member to be driven and for compensating a position of a lens which is the member to be driven. An absolute value integrating circuit integrates absolute values of signals before and after the adder circuit adds the sine wave. The two obtained integrated values are compared by a comparator circuit, and a gain adjusting circuit adjusts a gain of an amplifier which amplifies the compensation signal so that the two integrated values are equal to each other.
Claims6
A loop gain control circuit for servo control in which a position of a member to be driven is detected and the member to be driven is driven by an actuator such that the member to be driven is positioned at a target position, the loop gain adjusting circuit comprising:
- a sine wave adding unit that adds a sine wave to a compensation signal,
- wherein the compensation signal compensates the position of the member to be driven and is generated based on a position detection signal of the member to be driven, and
- wherein the sine wave adding unit obtains a signal which drives the actuator with the sine wave;
- an absolute value integrating circuit that integrates an absolute value of each signal before and after the sine wave adding unit adds the sine wave;
- and
- a gain adjusting circuit that compares two integrated values obtained by the absolute value integrating circuit, and adjusts a gain of an amplifier,
- wherein the amplifier amplifies the compensation signal such that the two integrated values are equal to each other.
Dependencies are inferred from the claim text.