Semiconductor device, display panel, and electronic device

A semiconductor device comprising:

• an error amplifier;
• a voltage controlled oscillator;
• a counter;
• a first circuit;
• and
• a terminal,
• wherein the terminal is electrically connected to a non-inverting input terminal of the error amplifier,
• wherein an inverting input terminal of the error amplifier is supplied with first voltage,
• wherein an output terminal of the error amplifier is electrically connected to an input terminal of the voltage controlled oscillator,
• wherein an output terminal of the voltage controlled oscillator is electrically connected to the counter,
• wherein the first circuit is electrically connected to the output terminal of the voltage controlled oscillator and the terminal,
• wherein the first circuit is configured to supply current through the terminal in accordance with a frequency of a signal output from the voltage controlled oscillator,
• wherein the counter is configured to count the number of pulses of the signal and outputting the number of the pulses,
• wherein the first circuit comprises a second circuit, a first switch, a second switch, and a capacitor,
• wherein the first switch is configured to control electrical continuity between the terminal and a first terminal of the capacitor,
• wherein the second switch is configured to control electrical continuity between the first terminal of the capacitor and a second terminal of the capacitor,
• wherein the second circuit is configured to control on and off states of the first switch and the second switch,
• wherein the second switch is off when the first switch is on, and
• wherein the first switch is off when the second switch is on.