期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
卷 66, 期 12, 页码 1962-1966出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2019.2896483
关键词
Class-C oscillator; flicker noise up-conversion; impulse sensitivity function (ISF); periodic transfer function (PXF) analysis; periodic AC (PAC) analysis; spectreRF
资金
- Science Foundation Ireland [14/RP/I2921]
This brief aims to intuitively explain and numerically verify the observed phenomenon of flicker noise reduction in oscillators of reduced conduction angle (i.e., in class-C), which has been presented in literature but never properly explained. The flicker phase noise in a voltage-biased oscillator capable of operating in class-B and class-C is compared and numerically verified using a commercial simulation model of TSMC 28-nm CMOS. We illustrate how narrowing the conduction angle can suppress the $1/{f}$ noise up-conversion by decreasing $1/{f}$ noise exposure to the asymmetric rising and falling edges of oscillation waveform. The effects of implicit common-mode tank in the class-C operation is also discussed. We further clarify ambiguities among several simulation methods of impulse sensitivity function (ISF) based on periodic small-signal analysis [periodic AC or periodic transfer function (PXF)], which is a key tool in understanding the flicker noise up-conversion. A clearer ISF simulation method based on positive sidebands of PXF is proposed.
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