论文信息 - Low-Voltage Process-Compensated VCO with On-Chip Process Monitoring and Body-Biasing Circuit Techniques

Low-Voltage Process-Compensated VCO with On-Chip Process Monitoring and Body-Biasing Circuit Techniques

SUMMARY A voltage-controlled oscillator (VCO) tolerant to process variations at lower supply voltage was proposed. The circuit consists of an on-chip threshold-voltage-monitoring circuit, a current-source circuit, a body- biasing control circuit, and the delay cells of the VCO. Because variations in low-voltage VCO frequency are mainly determined by that of the current in delay cells, a current-compensation technique was adopted by using an on-chip threshold-voltage-monitoring circuit and body-biasing circuit techniques. Monte Carlo SPICE simulations demonstrated that variations in the oscillation frequency by using the proposed techniques were able to be suppressed about 65% at a 1-V supply voltage, compared to frequencies with and without the techniques.

Tetsuya Asai | Tetsuya Hirose | Yoshihito Amemiya | Ken Ueno

[1] Beomsup Kim,et al. A low-noise, 900-MHz VCO in 0.6-/spl mu/m CMOS , 1999 .

[2] Marcel J. M. Pelgrom,et al. Matching properties of MOS transistors , 1989 .

[3] T. Asai,et al. A 46-ppm/°C temperature and process compensated current reference with on-chip threshold voltage monitoring circuit , 2008, 2008 IEEE Asian Solid-State Circuits Conference.

[4] Y. Amemiya,et al. A 0.3μW, 7 ppm/°C CMOS Voltage reference circuit for on-chip process monitoring in analog circuits , 2008, ESSCIRC 2008 - 34th European Solid-State Circuits Conference.

[5] Hidetoshi Onodera. Variability: Modeling and Its Impact on Design , 2006, IEICE Trans. Electron..