A Simple On-Chip Automatic Tuning Circuit for Continuous-Time Filter
碩士 === 國立中山大學 === 電機工程學系研究所 === 96 === In this thesis, a simple on-chip automatic frequency tuning circuit is presented. The tuning circuit is improved from voltage-controlled filter (VCF) frequency tuning circuit. We use a single time constant (STC) circuit to substitute the voltage-controlled filt...
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| Format: | Others |
| Language: | en_US |
| Published: |
2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/kfxpaa |
| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 96 === In this thesis, a simple on-chip automatic frequency tuning circuit is presented. The tuning circuit is improved from voltage-controlled filter (VCF) frequency tuning circuit. We use a single time constant (STC) circuit to substitute the voltage-controlled filter.
The STC circuit can produce a controllable delay time clock. The tuning circuit uses the constant delay time to tune the frequency of the filter. The design of a STC circuit is easy. Because the circuit is simple, the tuning circuit has less chip area and less power consumption.
The circuit has been fabricated with 0.35μm CMOS technology. It operates with supply voltages ±1.5 V. The filter operates at a 3-dB frequency of 10MHz. In simulation, the frequency tuning circuit has a 3-dB frequency tuning error of less than 12% and the power consumption less than 9.05mW over a range of supply voltages (±10%), operating temperatures (-20℃ to 70℃) and five models of SPICE model.
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