Dergiler / Turkish Journal of Electrical Engineering and Computer Science / 2014 / Cilt: 22 - Sayı: 5
A reconfigurable baseband circuit applied for WiMAX low-IF receivers
- Sayfa
- 1230–1240
- DOI
- —
Özet
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-m m CMOS technology, occupies 0.9 \times 1.3 mm2, 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%.
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-m m CMOS technology, occupies 0.9 \times 1.3 mm2, 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%.