connected to the drain side of the pmos transistor 11 the respective sources of the pair of pmos transistors 11 12 are connected to a pmos transistor 13 connected in common and acting as a switch the transistor 13 has its source connected to a source voltage vcc a pmos transistor 14 as a constant current source is connected to a drain of the pmos transistor 11 the pmos transistor 14 has its drain connected to ground gnd and input signals are supplied to the gate via input 17 the pmos transistor 12 has its drain connected to a capacitor 16 for storing the electrical charges and a nmos transistor n channel mosfet 15 for controlling the charging and discharging of the capacitor 16 the nmos transistor 15 has its gate connected in common with the gate of the pmos transistor 14 to the input 17 the nmos transistor 15 has its source connected to a ground voltage gnd the electrode of the capacitor 16 connected to the drain of the pmos transistor 12 is connected to the output 18 the other electrode of the capacitor 16 is connected to a ground voltage gnd in the first embodiment the pmos transistor 13 may be dispensed with the capacitor 16 may also be a.