A Wideband Variable-Gain Amplifier for High Frequency Applications

A Digitally-Controlled Variable-Gain Amplifier for Ultra-Wideband Applications

Introduction Ultra-wideband (UWB) technology is a promising solution for low-complexity, low cost, low power and high-data rate wireless connectivity among devices in a personal area network. The main signal processing operations involved in a typical analog front end of a UWB receiver before demodulation are frequency translation to baseband, signal amplification and filtering to strengthen th...

Design of a wideband variable gain amplifier

A Highly Linear Cmos Amplifier for Variable Gain Amplifier Applications

This paper reports the design of a highly-linear CMOS amplifier for Variable Gain Amplifier (VGA) applications. A better than –60dB 3rd harmonic distortion at differential output level of 1V peak-to-peak is obtained by utilizing a linearization scheme that does not rely on the active devices. The amplifier maintains 3dB bandwidth over 300MHz. A noise figure at 8.6dB is obtained with source impe...

High Linearity Cmos Variable Gain Amplifier for Uwb Applications

A large dynamic-range Variable Gain Amplifier (VGA) suitable for Ultra Wide Band (UWB) applications is presented. The VGA is composed of three programmable variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows our proposed VGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. Thorough analyses of the mi...

Wideband Low Distortion, High Gain Operational Amplifier

The OPA643 provides a level of speed and dynamic range previously unattainable in a monolithic op amp. Using a de-compensated voltage feedback architecture with two internal gain stages, the OPA643 achieves exceptionally low harmonic distortion over a wide frequency range. The "classic" differential input provides all the familiar benefits of precision op amps, such as bias current cancellation...