A current mode 2.4 GHz direct conversion receiver

A novel direct-conversion RF architecture is proposed that has a current mode interface between the low noise amplifier (LNA) and the down-conversion mixer, as well as the mixer and the base-band filter. The proposed architecture eliminates the voltage swing at the output of all the radiofrequency b...

Full description

Saved in:
Bibliographic Details
Main Authors: Chandra, G., Kamath, A., Easwaran, P.
Format: Conference Proceeding
Language:English
Subjects:
Baseband
Filtering
Filters
Linearity
Low-noise amplifiers
Noise robustness
Radio frequency
Radiofrequency amplifiers
Voltage
Wireless LAN
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A novel direct-conversion RF architecture is proposed that has a current mode interface between the low noise amplifier (LNA) and the down-conversion mixer, as well as the mixer and the base-band filter. The proposed architecture eliminates the voltage swing at the output of all the radiofrequency blocks. The voltage swing is seen only in the baseband after second order filtering, thus resulting in significant linearity improvements and robustness to adjacent channel interference. The current mode interface between filter and mixer also eliminates a redundant voltage-current conversion, giving significant noise advantages. A prototype wireless local area network (WLAN) receiver was designed and simulated in 0.13 /spl mu/m technology, giving a third-order input-referred intercept point of 5 dBm and a noise figure of 2.7 dB for the receive chain. The circuit (including base-band) consumes 8 mA from a 1.2 V supply.
ISSN:0271-4302
2158-1525
DOI:10.1109/ISCAS.2005.1465766