Name
Abstract | ||
|---|---|---|
This paper describes the architecture and implementations of an automatic digital tuning circuit for a complex bandpass filter (BPF) in a low-power and low-cost transceiver for applications such as personal authentication and wireless sensor network systems. The architectural design analysis demonstrates that an active RC filter in a low-IF architecture can be at least 47.7% smaller in area than a conventional g(m)-C filter; in addition, it features a simple implementation of an associated tuning circuit. The principle of simultaneous tuning of both the center frequency and bandwidth through calibration of a capacitor array is illustrated as based on an analysis of filter characteristics, and a scalable automatic digital tuning circuit with simple analog blocks and control logic having only 835 gates is introduced. The developed capacitor tuning technique can achieve a tuning error of less than +/-3.5% and lower a peaking in the passband filter characteristics. An experimental complex BPF using 0.18 mu m CMOS technology can Successfully reduce the tuning error from an initial value of -20% to less than +/-2.5% after tuning. The filter block dimensions are 1.22 mm x 1.01 mm; and in measurement results of the developed complex BPF with the automatic digital tuning circuit, current consumption is 705 mu A and the image rejection ratio is 40.3 dB. Complete evaluation of the BPF indicates that this technique can be applied to low-power, low-cost transceivers. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1587/transele.E92.C.1304 | IEICE TRANSACTIONS ON ELECTRONICS |
Keywords | Field | DocType |
tunable filter, bandpass filter, calibration, radio receiver, frequency control | Digital electronics,Active filter,Band-pass filter,CMOS,Electronic engineering,Automatic frequency control,Bandwidth (signal processing),Low-pass filter,Center frequency,Engineering | Journal |
Volume | Issue | ISSN |
E92C | 10 | 1745-1353 |
Citations | PageRank | References |
1 | 0.43 | 2 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Hideaki Kondo | 1 | 1 | 0.43 |
| Masaru Sawada | 2 | 1 | 0.77 |
| Norio Murakami | 3 | 1 | 0.43 |
| Shoichi Masui | 4 | 63 | 17.88 |