A CMOS Variable Gain Front-end for a WCDMA Receiver
- Resource Type
- Conference
- Authors
- Alam, Shaikh K.; DeGroat, Joanne
- Source
- 2007 IEEE International Symposium on Circuits and Systems (ISCAS) Circuits and Systems (ISCAS), 2007 IEEE International Symposium on. :1457-1460 May, 2007
- Subject
- Components, Circuits, Devices and Systems
Communication, Networking and Broadcast Technologies
Engineered Materials, Dielectrics and Plasmas
Gain
Multiaccess communication
Noise measurement
CMOS technology
Radio frequency
Noise figure
Voltage
Impedance matching
Radiofrequency integrated circuits
Transceivers
Analog RF-CMOS
direct conversion
front-end
LNA
mixer
receiver
WCDMA
- Language
- ISSN
- 0271-4302
2158-1525
This paper describes a variable gain WCDMA front-end receiver based on a direct conversion architecture in 0.18-μm CMOS. The front-end comprises a low noise variable gain amplifier (LNA) and a mixer. The LNA provides a 50-Ω input impedance and utilizes a tuned load to provide high selectivity. The front-end achieves a voltage conversion gain of 29.3 dB in the high gain mode of the LNA within 1-dB compression point dBm ( iCP 1dB ) of -21 dBm. The front-end acquires an NF of 4.4 dB with an input return loss, S 11 , of -12.4 dB. The front-end achieves an in-band IIP3 of -6.16 dBm. The integrated LNA and mixer consumes approximately 9.2 mA of current from a 1.8-V power supply.