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

J Ryynanen, K Kivekas, J Jussila… - IEEE Journal of Solid …, 2001 - ieeexplore.ieee.org
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 0.35-/spl mu/m 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, which is divided between the LNA and
quadrature mixers. The measured double-sideband noise figure and voltage gain are 2.3 …

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

MY Wang, RRB Sheen, OTC Chen… - 2002 IEEE International …, 2002 - ieeexplore.ieee.org
In this work, a dual-band radio frequency (RF) front-end, which can be operated for
wideband code division multiple access (WCDMA) and Global Positioning System (GPS), is
developed. This RF front-end includes two differential low noise amplifiers, double-balanced
mixers of I and Q channels and a multiphase voltage-controlled oscillator (VCO). The front-
end architecture without external components is implemented by the low intermediate
frequency (IF) technique which is very suitably for circuit integration. As compared to the …
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