Detection circuit, physical quantity detection apparatus, angular velocity detection apparatus, integrated circuit device, and electronic instrument

摘要

A detection circuit includes a synchronous detection circuit (synchronous detection section) that synchronously detects a signal that includes a detection signal of a vibrator (an output signal of an amplifier), a switched capacitor filter (SCF) circuit that filters a signal that has been synchronously detected by the synchronous detection circuit (an output signal of a programmable gain amplifier), and an output buffer that buffers and outputs a signal that has been filtered by the SCF circuit, the gain of the SCF circuit being larger than 1.

主权项

1. A detection circuit comprising:
a synchronous detection section that synchronously detects an alternating-current signal that corresponds to a detection target physical quantity; a switched capacitor filter that filters a signal that has been synchronously detected by the synchronous detection section; and an output buffer that buffers and outputs a signal that has been filtered by the switched capacitor filter, a gain K1 of the switched capacitor filter being larger than 1, and the gain K1 of the switched capacitor filter being larger than a gain K2 of the output buffer.