Digital variable capacitance circuit, resonant circuit, amplification circuit, and transmitter

A digital variable capacitance element, comprising

• a plurality of capacity cells that are connected in parallel between two output terminals, wherein one of the capacity cells comprises:
• a first capacitor having one end connected to one of the two output terminals;
• an impedance element that is connected in series with the first capacitor between the two output terminals;
• a transistor that is connected in parallel with the impedance element and is controlled in accordance with a digital control signal;
• a bias voltage supply terminal that is supplied with a bias voltage;
• a transmission gate connecting the bias voltage supply terminal to another end of the first capacitor and to a drain terminal of the transistor;
• a control input terminal connected to a gate terminal of the transistor and to the transmission gate;
• and
• a NOT circuit located between the transmission gate and the gate terminal of the transistor,
• wherein the transmission gate is connected to an output of the NOT circuit, and the control terminal is connected to an input of the NOT circuit.