Abstract
The paper describes a CMOS multivibrator using a differential pair with positive feedback via a current mirror and a diode-connected NMOS transistor; the output voltage is taken at this transistor. The timing capacitor is charged by a current source and discharged by the differential pair tail current. During capacitor charging the tail current is steered into the current mirror. The mirror output current is applied to a diode-connected transistor and creates the HIGH level of the output voltage. During discharging the diode connected transistor obtains a small current (from another current source) which determines the LOW level of the output voltage. The capacitive loading and frequency limit are investigated. The design procedure is given. The body effect does not affect the circuit performance. This allows to reduce the multivibrator area.
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