Oscillator, electronic apparatus, vehicle, and manufacturing method of oscillator

A manufacturing method of an oscillator, the method comprising:

• assembling an oscillator, the oscillator including an external terminal, a resonator, and an oscillation circuit that oscillates the resonator, in which the oscillation circuit includes an amplification circuit and a current source which supplies a current to the amplification circuit, in which the current is configured, after the oscillator has been turned on, to be set according to a first control signal which is input from the external terminal and a drive level of the resonator is changed according to the current;
• and
• inputting the first control signal to the external terminal and inspecting a drive level dependency of the resonator based on a change of a signal output from the oscillator, wherein the current source includes a constant current source and a current mirror circuit and is controlled by current select data to generate various current values, wherein:
• the current mirror circuit includes a first transistor that is connected to the constant current source,
• the current source includes two or more transistors that are each connected to a switch to be selectively turned on or off based on the current select data, and
• according to the first control signal input from the external terminal, the switch for each of the two or more transistors in the current source sequentially enters into an ON state, and after reaching a maximum value of the current supplied to the amplification circuit, the switch sequentially enters into an OFF state.