Oscillation circuit, semiconductor integrated circuit device, vibrating device, electronic apparatus, and moving object

An oscillation circuit which is connected to an amplification circuit and oscillates a resonator element to output an oscillation signal, comprising:

• a first variable capacitance part which includes a first variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a first reference voltage, and is connected to an input side of the amplification circuit;
• and
• a second variable capacitance part which includes a second variable capacitance element whose capacitance is controlled on the basis of a potential difference between the first control voltage and a second reference voltage, and is connected to an output side of the amplification circuit,
• wherein, a composite capacitance in the first variable capacitance part excluding the first variable capacitance element is a first composite capacitance, and a composite capacitance in the second variable capacitance part excluding the second variable capacitance element is a second composite capacitance,
• if the second composite capacitance is greater than the first composite capacitance, when comparing with capacitance based on a reference potential difference, a capacitance of the second variable capacitance element is set to be greater than a capacitance of the first variable capacitance element, and
• if the first composite capacitance is greater than the second composite capacitance, when comparing with capacitance based on the reference potential difference, the capacitance of the first variable capacitance element is greater than the capacitance of the second variable capacitance element.