Semiconductor device including current mirror circuit

A semiconductor device comprising:

• a plurality of current mirror circuits having reference input terminals and output terminals respectively, each of the reference input terminals being provided with a current having a different current value;
• a current output terminal connected to each of the output terminals of the current mirror circuits;
• and
• a control circuit to output a control signal to control output currents of the current mirror circuits,
• each of the current mirror circuits including:
• a first insulated gate type transistor having a first gate terminal, a first drain terminal connected to one of the reference input terminals and a first source terminal connected to a power supply;
• and
• a plurality of second insulated gate type transistors, each having a second gate terminal, a second drain terminal connected to one of the output terminals and a second source terminal connected to the power supply, each of the second insulated gate type transistors being controlled by the control signal to set to one of ON and OFF states,
• wherein the number of ON or OFF states of the second insulated gate type transistors increases or decreases monotonously to change the value of the output current, and
• each of the current mirror circuits further comprises switching elements, the switching elements being provided between the first drain terminal of the first insulated gate type transistors and the second gate terminals of the second insulated gate type transistors respectively, and the switching elements further being driven by the control signal to set each of the second insulated gate type transistors to one of on and off states.

A semiconductor device comprising:

• a plurality of current mirror circuits having reference input terminals and output terminals respectively, each of the reference input terminals being provided with a current having a different current value;
• a current output terminal connected to each of the output terminals of the current mirror circuits;
• and
• a control circuit to output a control signal to control output currents of the current mirror circuits,
• each of the current mirror circuits including:
• a first insulated gate type transistor having a first gate terminal, a first drain terminal connected to one of the reference input terminals and a first source terminal connected to a power supply;
• and
• a plurality of second insulated gate type transistors, each having a second gate terminal, a second drain terminal connected to one of the output terminals and a second source terminal connected to the power supply, each of the second insulated gate type transistors being controlled by the control signal to set to one of ON and OFF states,
• wherein the number of ON or OFF states of the second insulated gate type transistors increases or decreases monotonously to change the value of the output current, and
• the first drain terminals of the first insulated gate type transistors and the second gate terminals of the second insulated gate type transistors are connected each other selectively and directly in at least one of the current mirror circuits.