Design and Implementation of Cartesian Loop Chip for the Narrow-Band Walky-Talky 


Vol. 27,  No. 9, pp. 871-878, Sep.  2002


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  Abstract

The cartesian loop chip which is one of key devices in narrow-band Walky-Talky transmitter using RZ-SSB modulation method was designed and implemented with 0.35㎛ CMOS technology. The reduced size and low cost of transmitter were available by the use of direct-conversion and cartesian loop chip, which improved the power efficiency and linearity of transmitter. In addition, low power operation was possible through CMOS technology.
The performance test results of transmitter showed -23dBc improvement of lMD and -30dBc below suppression of SSB characteristic in the operation of cartesian loop chip (closed-loop). At that time, the transmitting power was about 37dBm (5W). The main parameters to improve the transmitting characteristic and to compensate the distortion in feed back loop such as DC-offset, loop gain and phase value are interfaced with notebook PC to be controlled with S/W.

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  Cite this article

[IEEE Style]

Y. Chong, J. Choi, S. Oh, "Design and Implementation of Cartesian Loop Chip for the Narrow-Band Walky-Talky," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 9, pp. 871-878, 2002. DOI: .

[ACM Style]

Young-Jun Chong, Jae-Ick Choi, and Seung-Hyeub Oh. 2002. Design and Implementation of Cartesian Loop Chip for the Narrow-Band Walky-Talky. The Journal of Korean Institute of Communications and Information Sciences, 27, 9, (2002), 871-878. DOI: .

[KICS Style]

Young-Jun Chong, Jae-Ick Choi, Seung-Hyeub Oh, "Design and Implementation of Cartesian Loop Chip for the Narrow-Band Walky-Talky," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 9, pp. 871-878, 9. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880