WCDMA Direct Conversion Receiver Front End

A dual-band RF front-end for WCDMA and GPS applications

An RF front-end for dual-band dual-mode operation is presented. The front-end consumes 22.5 mW from a 1.8-V supply and is designed to be used in a direct-conversion WCDMA and GSM receiver. The front-end has been fabricated in a 0.35m BiCMOS process and, in both modes, can use the same devices in the signal path except the LNA input transistors. The front-end has a 27-dB gain control range, whic...

WCDMA Direct Conversion Front End in 0.13um digital CMOS

This project presents a direct-conversion 3G front end in 0.13um digital CMOS for use with the 2.1 GHz WCDMA frequency band. These receivers, widely used in 3G mobile telephony, require low power consumption and cost effective integration with other systems while maintaining high linearity and sensitivity. This project includes the design of a differential LNA, a double-balanced mixer and an on...

A Digital-Front-End Enhanced Multi-Mode/Multi-Standard Wireless Receiver

This paper presents a multi-mode receiver concept for different transmission standards like UMTS and IS95. Due to the use of a Digital-Front-End (DFE) the requirements for the analog part of the well known direct conversion receiver (DCR) architecture decrease because channelization and fine frequency tuning are shifted from the analog into the digital domain. The adaptation of the channelizati...

CMOS LNA and Mixer Components for 2GHz applications in 0.18-μm CMOS

This paper describes a low noise variable gain amplifier (LNA) and a mixer for a WCDMA frontend receiver based on a direct architecture in 0.18-μm CMOS. The LNA provides a 50Ω input impedance and utilizes a tuned load to provide high selectivity. The LNA achieves a maximum small signal gain of 16.8 dB and a minimum gain of 4.6 dB with good input return loss. In the high gain and the low gain mo...

Direct Conversion RF Front-End Implementation for Ultra- Wideband (UWB) and GSM/WCDMA Dual-Band Applications in Silicon-Based Technologies