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A CMOS Fully Integrated Wideband Tuning System for Satellite Receivers  

Kim, Jae-Wan (Dept. of Electronic Engineering, Korea University)
Ryu, Sang-Ha (Division, Information & Communications Business, Samsung Electronics Co., Ltd.)
Suh, Bum-Soo (Dept. of Electronic Engineering, Korea University)
Kim, Sung-Nam (Electronics and Telecommunications Research Institute)
Kim, Chang-Bong (Information and Communication Engineering, Kongju National University)
Kim, Soo-Won (Dept. of Electronic Engineering, Korea University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.39, no.7, 2002 , pp. 7-15 More about this Journal
Abstract
The digital DBS tuner is designed and implemented in a CMOS process using a direct-conversion architecture that offers a high degree of integration. To generate mathched LO I/Q quadrature signals covering the total input frequency range, a fully integrated ring oscillator is employed. And, to decrease a high level of phase noise of the ring oscillator, a frequency synthesizer is designed using a double loop strucure. This paper proposes and verifies a band selective loop for fast frequency switching time of the double loop frequency synthesizer. The down-conversion mixer with source follower input stages is used for low voltage operation. An experiment implementation of the frequency synthesizer and mixer with integrated a 0.25um CMOS process achieves a switching time of 600us when frequency changes from 950 to 2150MHz. And, the experiment results show a quadrature amplitude mismatch of max. 0.06dB and a quadrature phase mismathc of max. >$3.4^{\circ}$.
Keywords
CMOS; Tuner; Frequency Synthesizer; Double Loop; Band Selective Loop; Frequency Switching Time; Mixer;
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