A reconfigurable baseband circuit applied for WiMAX low-IF receivers

Authors

XIN CHENG
GUANGJUN XIE

DOI

10.3906/elk-1211-142

Abstract

This paper presents a reconfigurable baseband circuit for WiMAX low-IF receivers, including a complex filter and 2 automatic gain controllers (AGCs) for I and Q channels. Only by changing the capacitor values can the center and cutoff frequencies of the complex filter be adjusted simultaneously to realize the reconfigurability. Meanwhile, a novel one-step method to obtain fast gain settling of AGCs is proposed. The chip is fabricated in 0.13-\mu m CMOS technology, occupies 0.9 \times 1.3 mm^2, and consumes 14.8 mW of power with a 1.2-V power supply. The measurement results show a reconfigurable bandwidth of 2 K to 3.5/5/10 MHz, a gain range of 10 to 58 dB, and a total harmonic distortion of 0.43 % to 1.66%.

Keywords

WiMAX, reconfigurable, baseband circuit, complex filter, automatic gain controller

First Page

1230

Last Page

1240

Recommended Citation

CHENG, XIN and XIE, GUANGJUN (2014) "A reconfigurable baseband circuit applied for WiMAX low-IF receivers," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 22: No. 5, Article 10. https://doi.org/10.3906/elk-1211-142
Available at: https://journals.tubitak.gov.tr/elektrik/vol22/iss5/10