Oscillation drive device, physical quantity measurement device and electronic apparatus

An oscillation drive device that forms an oscillation loop with a vibrator for exciting a driving vibration in the vibrator, the oscillation drive device comprising:

• a comparator that excites a driving vibration on the vibrator based on a signal in the oscillation loop with a given voltage as a reference;
• a synchronous wave detection comparator that generates a reference signal for synchronous detection based on a signal in the oscillation loop;
• an oscillation detector that detects oscillation in the oscillation loop;
• a signal generation circuit that generates a switching control signal based on an oscillation result given by the oscillation detector;
• a first switch circuit inserted between the vibrator in the oscillation loop and an output of the comparator;
• and
• a second switch circuit inserted between an output of the synchronous wave detection comparator and the vibrator,
• wherein, during an oscillation startup stage in which oscillation in the oscillation loop is not detected by the oscillation detector, the first switch circuit electrically shuts off the output of the comparator from the vibrator based on the switching control signal, and the second switch alternately switches based on the switching control signal between a period in which an output of the synchronous wave detection comparator and the vibrator are electrically connected and a period in which a predetermined set voltage is supplied to the vibrator.