Science Publishing Group
The Variable Gain Amplifier (VGA) is an indispensable building block to maximize the dynamic range of modern wireless communication systems. A large dynamic-range Programmable Variable Gain Amplifier (PVGA) suitable for Ultra-Wide Band (UWB) applications is presented. The PVGA is composed of three programmable variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows the authors' proposed PVGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. Thorough analyses of the mid-band gain and noise are presented; and design tradeoffs are carefully handled.