A Simple On-Chip Automatic Tuning Circuit for Continuous-Time Filter
Chia-Hsiung KAO, Ping-Yu TSAI, I-Fan CHANG
DOI: 10.4236/ijcns.2010.31009   PDF    HTML     6,861 Downloads   12,711 Views   Citations


A simple on-chip automatic frequency tuning circuit is proposed. The tuning circuit is modified from voltage-controlled filter (VCF) frequency tuning circuit. We utilize an operational transconductance amplifier and a capacitor to from a single-time constant (STC) circuit which can produce a controllable delay time clock to tune the frequency of the filter. It can efficiently reduce the deviations in the 3 dB bandwidth from the variations of PVT (Process, Voltage and Temperature). The design of the STC circuit is simpler than VCF and it has less chip area. The chip has been implanted using TCMC 0.35 μm CMOS technology and the power consumption is less than 9.05 mW.

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C. KAO, P. TSAI and I. CHANG, "A Simple On-Chip Automatic Tuning Circuit for Continuous-Time Filter," International Journal of Communications, Network and System Sciences, Vol. 3 No. 1, 2010, pp. 66-71. doi: 10.4236/ijcns.2010.31009.

Conflicts of Interest

The authors declare no conflicts of interest.


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