Patent ID: 9660581
Date: 2017-05-23
CPC Classifications: H03B,H03L

Claim:
1. An oscillation circuit comprising: a circuit for oscillation which is electrically connected to a resonator and oscillates the resonator; a first frequency adjustment circuit that adjusts a frequency of the circuit for oscillation, the first frequency adjustment circuit having an output terminal that outputs a signal of the first frequency adjustment circuit; a second frequency adjustment circuit that adjusts the frequency of the circuit for oscillation; a first terminal that is an external terminal that receives a signal for controlling the oscillation circuit; and a voltage generation circuit that is capable of variably setting a voltage to be output, wherein the oscillation circuit has a first mode in which the second frequency adjustment circuit and the circuit for oscillation are electrically connected to each other, the voltage generation circuit and the circuit for oscillation are not electrically connected to each other, the first terminal and the second frequency adjustment circuit are electrically connected to each other, the first frequency adjustment circuit and the first terminal are not electrically connected to each other, and the frequency of the circuit for oscillation is controlled by output signals of the first frequency adjustment circuit and the second frequency adjustment circuit, and a second mode in which the voltage generation circuit and the circuit for oscillation are electrically connected to each other, the second frequency adjustment circuit and the circuit for oscillation are not electrically connected to each other, the first terminal and the output terminal of the first frequency adjustment circuit are electrically connected to each other, the first terminal and the second frequency adjustment circuit are not electrically connected to each other, and the frequency of the circuit for oscillation is controlled by output signals of the first frequency adjustment circuit and the voltage generation circuit.