Automatic tuning for high frequency continuous-time bandpass filters /
A novel automatic tuning scheme for continuous-time bandpass filters is presented. It is based on gain comparison at three different frequencies. The tuning scheme incorporates a PLL-based frequency synthesizer which generates the required references, a peak detector, two switched-capacitor integrat...
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
2002.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=765069881&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | A novel automatic tuning scheme for continuous-time bandpass filters is presented. It is based on gain comparison at three different frequencies. The tuning scheme incorporates a PLL-based frequency synthesizer which generates the required references, a peak detector, two switched-capacitor integrators which conduct gain comparison and generate frequency and quality factor tuning voltages, and a state machine to generate synchronous clocks for all the building blocks in the tuning circuitry. Q-factor is digitally set through the frequency divider of the frequency synthesizer. The tuning scheme does not rely on the assumption that Q is equal to the filter's passband gain. The tuning scheme is robust and can also be applied to filters in which the Q-factor is not a known function of the passband gain. The tuning scheme has a significant advantage over previously published tuning schemes for high-frequency, high-Q filters. It has a small silicon area overhead, small power consumption, and very good frequency and Q-tuning accuracy. Theoretical analysis and experimental results are provided. A second-order transconductance-C biquadratic filter is designed to demonstrate the proposed tuning circuitry. The test chip is fabricated in AMI 0.5[]m CMOS process. The measured results show the frequency error is 0.25%, Q error is 3% for a 200 MHz filter with a desired Q of 28.6. Other results such as the filter's dynamic range, noise performance and intermodulation are also presented. In addition, a design of a 2 GHz active LC filter tuning circuitry and its simulation results are provided. |
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| Item Description: | Vita. "Major Subject: Electrical Engineering". |
| Physical Description: | xi, 139 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 132-138). |