Current switch driving circuit and digital to analog converter

A current switch driving circuit, comprising:

• a first NMOS transistor in which a source terminal is connected to a ground terminal, a gate terminal receives an input signal, and a drain terminal outputs a driving signal;
• a PMOS transistor in which a drain terminal is connected to the drain terminal of the first NMOS transistor, and a gate terminal receives the input signal;
• a second NMOS in which a source terminal is connected to a source terminal of the PMOS transistor, a gate terminal is connected to a bias voltage terminal, and a drain terminal is connected to a power supply terminal;
• and
• a controller allowing the second NMOS transistor to be maintained constantly in an ON state.

A digital-to-analog converter, comprising:

• a conversion part for converting a digital signal to an analog signal;
• a current source for generating a current of a predetermined magnitude;
• a current switch for determining an output direction of the current generated from the current source;
• and
• a current switch driving circuit for generating a digital driving signal for driving the current switch,
• wherein the digital driving signal of a high level is a power supply voltage, and the digital driving signal of a low level is lower than the power supply voltage and is a positive voltage.