Design and Implementation of Automatic Gain Control for Wireless Receivers
Date Issued
2011
Date
2011
Author(s)
Ho, Tzu-Yi
Abstract
With the rapid development and popularization of wireless technology, nowadays people show ever-increasing demand for mass data transmission. Among all wireless local area network (WLAN) technology has attracted most attention due to the capability of real-time multimedia sharing anywhere anytime. Therefore, it is desirable to provide an excellent service quality for various environments.
In this thesis, in order to build up a more a reliable and robust wireless link, two architectures of automatic gain control (AGC) loop at both RF front-end and baseband are proposed for extending the dynamic range of the receiver. In Chapter 3, a power detector with offset cancellation is introduced for determining the gain mode of variable-gain low-noise amplifier. The gain selection mechanism prevents RF front-end circuits from operating in saturation. In Chapter 4, based on the proposed programmable gain amplifier gain (PGA) cell, a wide-bandwidth PGA with AGC function is constructed. The wideband operation meets the requirement of expanding channel bandwidth in new/ongoing WLAN standards.
Subjects
Auto gain control (AGC)
low noise amplifier (LNA)
power detector
programmable gain amplifier (PGA)
WLAN
Type
thesis
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