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3–5 GHz 4-Channel UWB Beamforming Transmitter With 1 Scanning Resolution Through Calibrated V ernier Delay Line in 0.13- mC M O S
一款3-5 GHz 4通道超宽带波束成形发射器，具有1°扫描分辨率和135°扫描范围。
0.13μm CMOS, 7.2mm², 9.6mW@80Mbps, 10pJ/bit, 7.5%效率
超宽带波束成形Vernier延迟线DLL校准FCC规范
▸采用Vernier延迟线实现10 ps精细分辨率
▸DLL校准技术加速校准48倍
▸新型功率谱密度校准电路满足FCC规范
Abstract
A 3–5 GHz 4-channel UWB beamforming transmitter with 1 scanning resolution and 135 scanning range is presented in this paper. The fine resolution is attained through Vernier delay lines capable of fine resolution down to 10 ps. Accurate path delay across channels as well as UWB pulse center frequency are achieved through the proposed DLL calibration technique, which speeds up the calibration by 48 times compared with a counter-based approach. A novel p ower spectral density calibra- tion circuit is included to adjust the UWB pulse shape for meeting the FCC mask. Fabricated in 0.13- m CMOS, the proposed trans- mitter occupies only 7.2 mm . The power consumption is 9.6 mW while transmitting at 80 Mbps, with each transmitter achieving 10 pJ/bit and transmitter ef ficiency of 7.5%. This is about ten times better than those existing UWB beamforming transmitters.