학술논문
A temperature-compensated CMOS LC-VCO enabling the direct modulation architecture in 2.4GHz GFSK transmitter
Document Type
Conference
Author
Source
Proceedings of the IEEE 2004 Custom Integrated Circuits Conference (IEEE Cat. No.04CH37571) Custom integrated circuists Custom Integrated Circuits Conference, 2004. Proceedings of the IEEE 2004. :273-276 2004
Subject
Language
Abstract
The frequency drift of an open-loop PLL is an issue for direct modulation applications such as Bluetooth transceivers. The drift mainly comes from the temperature variation of the VCO during the TX operation. In this paper, we propose the optimum location of the VCO, considering the temperature gradient through full-chip thermal analysis. Moreover, a novel temperature-compensated VCO by employing a new biasing scheme is proposed. The combination of these two techniques enables power reduction of the transmitter by 33% without sacrificing performance.