Affiliation:
1. Beijing University of Posts and Telecommunications
Abstract
In this paper, a wideband variable-gain amplifier (VGA) in CMOS for ultra wideband (UWB) system is designed. The operation frequency of the VGA is 4.2-4.8GHz, and the gain is continuously adjustable between 0 and 30dB. Cascaded Cherry-Hooper with two stages is adopted as the core unit of the VGA, and a temperature compensation circuit is used to reduce the effect of temperature on the performance of the system. The simulation shows that the temperature compensation circuit can compensate the effect of the temperature very well, and the noise figure of the wideband VGA can meet the requirements of the system.
Publisher
Trans Tech Publications, Ltd.
Reference5 articles.
1. Wang, Y., Afshar, B., Cheng, T. Y., Gaudet, V., & Niknejad, A. M, A 2. 5 mW inductorless wideband VGA with dual feedback DC-offset correction in 90nm CMOS technology, Radio Frequency Integrated Circuits Symposium, 2008, pp.91-94.
2. Li, T., Jiang, J., & Ye, B, An offset cancellation CMOS VGA for GPS receiver, Proceedings of the 2009 12th International Symposium on Integrated Circuits, 2009, pp.441-444.
3. D'Amico, S., De Matteis, M., & Baschirotto, A, A 6. 4 mW, 4. 9 nV/√ Hz, 24 dBm IIP3 VGA for a multi-standard (WLAN, UMTS, and Bluetooth) receiver, Analog Integrated Circuits and Signal Processing, 61(1), 1-7.
4. Lee, H. D., Kim, M. G., Kim, C. H., & Hong, S, A Temperature-Independent Transmitter IC for 5. 8-GHz DSRC Applications, IEEE Transactions on Circuits and Systems I: Regular Papers, 55(6), 1733-1741.
5. C. Wu,C. Liu and S. Liu, A 2GHz CMOS variable gain amplifier with 50dB linear-in-magnitude controlled gain range for 1OGbase-LX4etheme, ISSCC Dig. Tech. Papers, 2004, pp.484-541.