| 摘要 |
A bias generating circuit for reducing an external DC power supply voltage to a predetermined, lower, stable DC voltage used as a power source for internal logic circuits in a semiconductor IC chip includes an oscillator for converting the external DC voltage into a pulse signal, a smoothing circuit for converting a pulse signal into the lower DC voltage, and a control circuit interposed between the oscillator and the smoothing circuit for varying the pulse duration of the pulse signal from the oscillator to a changed pulse signal, and for regulating the lower DC voltage to a predetermined amplitude in response to the voltage variation in the lower DC voltage. The control circuit comprises a CMOS inverter, a CMOS buffer circuit for varying the pulse duration of the output signal of the CMOS inverter, and a voltage compensating circuit for controlling the transconductance of the CMOS inverter in response to the variation of the lower DC voltage.
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