FET MULTIVIBRATOR CIRCUIT

PURPOSE:To attain high speed and low power consumption by adopting the constitution such that two FETs constituting a source coupled switch and a source follower are operated in the saturating state so as to use FETs. CONSTITUTION:Each source of FETs Q11, Q12 constituting the source coupling switch is connected to a source supply voltage Vss via FETs Q13, Q14 being constant current loads. Moreover, the sources of the FETs Q11, Q12 are connected across a capacitor C1. Drains of the FETs Q11, Q12 are connected to a source supply power VDD via load resistors R11, R12 and a level shift diode D11 and the diodes D12, D13 limit the voltage drop by the resistors R11, R12. Furthermore, the sources of the FETs Q15, Q16 being the components of the source follower are connected to the power supply Vss via the level shift diodes D14, D15 and constant current load FETs Q17, Q18. Thus, the FETs Q11, Q12, Q15 are operated in the saturating region.