DIGITAL CONTROL TYPE OSCILLATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a digital control type oscillation circuit, capable of wide setting of the change width of the capacity value of a capacitive element. SOLUTION: A vibration element 21, a basic capacitive element group 22 provided with serially connected first basic capasitive element 25 and second basic capacitive element 26 and an additional capacitive element group 23 provided with serially connected first additional capacitive element 27 and second additional capacitive element 28 are connected in parallel. The connection of the basic capasitive element group 22 and the additional capacitive element group 23 is interrupted by a first switch 29 and a second switch 30.