대한전기학회:학술대회논문집 (Proceedings of the KIEE Conference)
- 대한전기학회 1999년도 하계학술대회 논문집 G
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- Pages.3184-3186
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- 1999
4분법을 이용한 전압 클램프 VCO의 설계에 관한 연구
A Study on the Design of Voltage Clamp VCO Using Quadrature Phase
- Seo, I.W. (Department of electrical engineering Korea Univ.) ;
- Choi, W.B. (Department of electrical engineering Korea Univ.) ;
- Joung, S.M. (Department of electrical engineering Korea Univ.) ;
- Sung, M.Y. (Department of electrical engineering Korea Univ.)
- 발행 : 1999.07.19
초록
In this paper, a new structure of fully differential delay cell VCO using quadrature phase for low phase noise and high speed operation is suggested. It is realized by inserting voltage clamp circuit into input pairs of delay cells that include three-control current source having high output impedance. In this reason. this newly designed delay cell for VCO has the low power supply sensitivity so that the phase noise can be reduced. The whole characteristics of VCO were simulated by using HSPICE and SABER. Simulation results show that the phase noise of new VCO is quite small compared with conventional fully differential delay cell VCO and ring oscillator type VCO. It is also very beneficial to low power supply design because of wide tuning range.
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