Detection device, gyrosensor, and electronic instrument
First Claim
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1. A detection device comprising:
- a driver circuit which drives a vibrator to vibrate; and
a detection circuit which receives an output signal from the vibrator and detects a desired signal, the detection circuit including;
an amplifier circuit which amplifies the output signal from the vibrator;
a sensitivity adjustment circuit which performs sensitivity adjustment by variably controlling a gain; and
a synchronous detection circuit which performs synchronous detection based on a reference signal;
the sensitivity adjustment circuit being provided in a preceding stage of the synchronous detection circuit;
an offset adjustment circuit which performs adjustment for removing an initial offset voltage of an output signal of the detection device; and
a filter section which filters a signal after synchronous detection;
wherein the filter section includes;
a discrete-time filter; and
a continuous-time filter provided in a preceding stage of the discrete-time filter; and
wherein the continuous-time filter has frequency characteristics of removing an offset change in an unnecessary signal due to a change in environment.
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Abstract
A detection device includes a driver circuit and a detection circuit. The detection circuit includes an amplifier circuit which amplifies an output signal from a vibrator, a sensitivity adjustment circuit which performs sensitivity adjustment by variably controlling a gain, and a synchronous detection circuit which performs synchronous detection based on a reference signal. The sensitivity adjustment circuit is provided in the preceding stage of the synchronous detection circuit. The sensitivity adjustment circuit operates as a programmable-gain amplifier and a high-pass filter.
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Citations
8 Claims
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1. A detection device comprising:
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a driver circuit which drives a vibrator to vibrate; and a detection circuit which receives an output signal from the vibrator and detects a desired signal, the detection circuit including; an amplifier circuit which amplifies the output signal from the vibrator; a sensitivity adjustment circuit which performs sensitivity adjustment by variably controlling a gain; and a synchronous detection circuit which performs synchronous detection based on a reference signal; the sensitivity adjustment circuit being provided in a preceding stage of the synchronous detection circuit; an offset adjustment circuit which performs adjustment for removing an initial offset voltage of an output signal of the detection device; and a filter section which filters a signal after synchronous detection; wherein the filter section includes; a discrete-time filter; and a continuous-time filter provided in a preceding stage of the discrete-time filter; and wherein the continuous-time filter has frequency characteristics of removing an offset change in an unnecessary signal due to a change in environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification