US 9,813,037 B2
Detection device, sensor, electronic apparatus, and moving object
Katsuhiko Maki, Chino (JP); and Masahiro Kanai, Suwa (JP)
Assigned to Seiko Epson Corporation, (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Nov. 6, 2014, as Appl. No. 14/534,527.
Claims priority of application No. 2013-231342 (JP), filed on Nov. 7, 2013.
Prior Publication US 2015/0122035 A1, May 7, 2015
This patent is subject to a terminal disclaimer.
Int. Cl. G01C 19/56 (2012.01); G01C 19/5776 (2012.01); G01C 19/5614 (2012.01); H03G 3/30 (2006.01); G01C 19/5649 (2012.01); H03F 3/45 (2006.01)
CPC H03G 3/3005 (2013.01) [G01C 19/5614 (2013.01); G01C 19/5649 (2013.01); G01C 19/5776 (2013.01); H03F 3/45183 (2013.01); H03F 2200/261 (2013.01); H03F 2203/45212 (2013.01); H03F 2203/45476 (2013.01); H03F 2203/45508 (2013.01); H03F 2203/45512 (2013.01); H03F 2203/45528 (2013.01); H03F 2203/45534 (2013.01); H03F 2203/45536 (2013.01); H03F 2203/45674 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A detection device comprising:
a driving circuit which receives a feedback signal from a vibrator, and drives the vibrator; and
a detection circuit which receives a detection signal from the vibrator, and detects a desired signal,
wherein the driving circuit includes
a current-voltage conversion circuit which receives the feedback signal, performs a current-voltage conversion, and outputs an input voltage signal after performing the current-voltage conversion,
a drive signal output circuit which amplifies the input voltage signal, and outputs a drive signal of a sine wave, and
a gain control circuit which controls a gain of amplification in the drive signal output circuit, and
when a resistance for a current-voltage conversion of the current-voltage conversion circuit is set to RI, the gain of the amplification of the drive signal in the drive signal output circuit is set to K, and an equivalent series resistance in a fundamental wave mode of the vibrator is set to R, the gain control circuit performs a gain control such that K·RI=R is satisfied,
wherein the drive signal output circuit includes:
an Operational Transconductance Amplifier (OTA) circuit in which a transconductance is set by a control voltage from the gain control circuit, and the input voltage signal is converted into a current signal; and
a second current-voltage conversion circuit which performs the current-voltage conversion with respect to the current signal from the OTA circuit, and outputs the drive signal.