抖动
计算机科学
相位噪声
电子工程
带宽(计算)
本振子
时钟频率
无线
频率调制
正交调幅
电气工程
误码率
电信
工程类
CMOS芯片
频道(广播)
标识
DOI:10.1109/cicc53496.2022.9772842
摘要
Whether employed as local oscillators in wireless communications or radar systems, or as clock generators in data converters, high-performance frequency synthesizers are essential elements of any advanced electronic systems. In wireless applications, highly spectral-efficient modulations, such as quadrature amplitude modulation with large number of symbols (256 or above), enables higher bit rate at same bandwidth occupation, at the price of tighter constraints on the error-vector magnitude. This demands for an ultra-low jitter local oscillator (LO). For instance, the 5G new radio for cellular communications at frequencies around 28GHz calls for an integrated phase noise well below -36dBc, translating into an absolute rms jitter well below 90fs, over all the operating conditions. Similar performance is also required to the clock of high-speed analog-to-digital converters not to deteriorate their signal-to-noise ratio (SNR). An SNR of 62dB (i.e., 10 equivalent bits) at 1GHz bandwidth requires a clock jitter well below 130fs.
科研通智能强力驱动
Strongly Powered by AbleSci AI