To provide a detection device, a gyro sensor, and an electronic apparatus each of which can efficiently eliminate an unnecessary signal.
The detection device includes a drive circuit and a detection circuit. The detection circuit includes: an amplification circuit, which amplifies an output signal sent from a transducer; a synchronous detection circuit, which performs synchronous detection of the amplified signal in accordance with a reference signal; and a filter section, having a discrete-time filter, which filters the signal subjected to the synchronous detection. The drive circuit or the detection circuit includes a sampling point adjustment circuit which adjusts the phase of a clock for use in sampling of the discrete-time filter and adjusts a sampling point in the discrete-time filter. The sampling point sets a sampling point at a zero-cross point of an unnecessary signal that appears in a frequency band of 2fd due to the synchronous detection performed by the synchronous detection circuit.
Takekoshi Noboru
Enami Tomokazu
Yasushi Kuroda