A CMOS Fully Integrated Wideband Tuning System for Satellite Receivers

위성 수신기용 광대역 튜너 시스템의 CMOS 단일칩화에 관한 연구

  • 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)
  • Published : 2002.07.01

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

References

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