Patent ID: 7849744
Filing Date: 2010-12-14
Classification: G01C,G01P,H03B

Abstract:
1. A driver device which is connected with a vibrator to form an oscillation loop and causes the vibrator to produce driving vibrations when measuring a physical quantity using an output signal obtained by synchronously detecting a detection signal output from the vibrator, the driver device comprising: a gain control amplifier which causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in the oscillation loop; and a comparator which generates a synchronous detection reference signal based on a signal in the oscillation loop; the driver device setting a gain in a first oscillation loop including the vibrator and the comparator to be larger than unity using an output from the comparator, and then causing the vibrator to produce the driving vibrations by controlling an oscillation amplitude in a second oscillation loop including the vibrator and the gain control amplifier.