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US 8,127,608 B2Granted
Detection device, gyrosensor, and electronic instrument
AssigneeSeiko Epson Corporation
InventorNoriyuki Murashima
Life of this patent
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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.
Claims8
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.
14 more elements
Dependencies are inferred from the claim text.