Patent ID: 8127608

Claim:
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.