Differential source-pull on the WCDMA receiver

Author

Guan, Claire ; Liu, Chris

Author_Institution

Broadcom, Irvine, CA, USA

fYear

2011

fDate

5-7 June 2011

Firstpage

1

Lastpage

4

Abstract

A practical approach to source-pull differential input LNA is presented using a single-ended RF tuner adapted by a balun. The adaptation only considers balun´s differential mode S-parameters for the reference plane extension. Error analysis on neglecting common mode S-parameters provides guidelines to choose proper balun for better adaptation accuracy: a) higher common-mode rejection ratio, b) less reflection on the unbalanced port and c) less insertion loss. The approach is applied to the NF optimization on a cellular WCDMA receiver. The resultant source pull estimation correlates well with the final optimal matching network. The minimum NF is achieved at 2.3dB.

Keywords

S-parameters; baluns; cellular radio; code division multiple access; optimisation; radio receivers; tuning; LNA; NF optimization; balun differential mode S-parameter; cellular WCDMA receiver; common-mode rejection ratio; differential source-pull; gain 2.3 dB; optimal matching network; reference plane extension; single-ended RF tuner; Impedance matching; Noise measurement; Optimized production technology; Reflection; Scattering parameters; Tuners; differential mode S- parameters; differential source pull; impedance matching; minimum NF; optimal gamma;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium (RFIC), 2011 IEEE

Conference_Location

Baltimore, MD

ISSN

1529-2517

Print_ISBN

978-1-4244-8293-1

Electronic_ISBN

1529-2517

Type

conf

DOI

10.1109/RFIC.2011.5940701

Filename

5940701