Intrinsic 1 Device Noise Reduction and Its Effect on Phase Noise in CMOS Ring Oscillators
نویسندگان
چکیده
This paper gives experimental proof of an intriguing physical effect: periodic on–off switching of MOS transistors in a CMOS ring oscillator reduces their intrinsic 1=f noise and hence the oscillator’s close-in phase noise. More specifically, it is shown that the 1=f phase noise is dependent on the gate-source voltage of the MOS transistors in the off state. Measurement results, corrected for waveform-dependent upconversion and effective bias, show an 8-dB-lower 1=f phase noise than expected. It will be shown that this can be attributed to the intrinsic 1=f noise reduction effect due to periodic on–off switching.
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