the mosfet m 117 has a source connected to the power supply vdd and a drain connected to a source of the mosfet m 118 that is both the mosfets are connected in series a gate of the mosfet m 118 is applied with a constant reference voltage v ref further a drain of the mosfet m 118 and the drain of the mosfet m 116 are connected in series both the mosfet m 119 and the mosfet m 120 are p channel mosfets the mosfet m 119 has a source connected to power supply vdd and a drain connected to a source of the mosfet m 120 that is both the mosfets are connected in series a drain of the mosfet m 120 is connected to one end of the current source i 102 the other end of the current source i 102 is connected to the ground gnd further a gate and the drain of the mosfet m 119 are connected together and a gate and the drain of the mosfet m 120 are connected together in this case a gate of the mosfet m 107 is connected to the gate of the mosfet m 119 further a gate of the mosfet m 108 is connected to the gate of the mosfet m 120 that is the mosfet m 107 the mosfet m 108 the mosfet m 119 and the mosfet m 120 constitute a cascode current mirror cm 103 further a gate of the mosfet m 117 is connected to the gate of the mosfet m 119 both the mosfets constitute a current mirror cm.