Optimal Design of Broadband and Large Dynamic Range IF AGC Circuit

Abstract:

The bandwidth and the dynamic range is the critical performance parameter of IF AGC (Intermediate Frequency Automatic Gain Control) in wireless receiver. In order to design broadband and large dynamic range IF AGC circuit, the main functions and performance of the VGA (Variable Gain Amplifier) AD8367 and the logarithmic amplifier AD8318 are analyzed. A kind of a broadband large dynamic range IF AGC module is designed by using these two chips. Detail circuit is provided; key technology of AGC module is analyzed and the actual testing results are offered. Compared to the traditional AGC circuit, the module is simple; it has small size and obvious advantages in broadband and large dynamic range.

• Periodical: Advanced Materials Research (Volume 722)
• Pages: 194-197
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.722.194
• Online since: July 2013
• Authors: Ming Fei Wang, Peng Cao, Hui Yong Sun, Ming Jin Xu
• Keywords: Automatic Gain Control, Broadband, Large Dynamic Range, Logarithm Gain Control

References

[1] CAO Peng, FEI Yuan-chun. Design of a Large Dynamic Range and Broad Band Digital IF AGC System [J]. Transactions of Beijing Institute of Technology, 2003, 23(5):613-616.

[2] Zhang Li-min. Application of AGC Technology in Short-wave Digital Receiver [J]. Ship Electronic Engineering, 2008, 170(8):71-76.

[3] LIU Xiao-ming, LIU Xiao-wei, ZHONG Yuan-hong, etc. Research on Automatic Gain Control Loop for Broad Band IF Receive [J]. Modern Radar, 2007, 29(7):89-92.

[4] Analog Device Inc. AD8367 data sheet [EB/OL].2005, [2009-09-15], http://www.analog. com/en/amplifiers-and-comparators/variable-gain-amplifiers/ad8367/products/product.html.

[5] Analog Device Inc. AD8318 data sheet [EB/OL].2007, [2009-08-30], http://www.analog. com/en/rfif-components/log-ampsdetectors/ad8318/products/product.html.