JSSC 2009第12期Data Converters0.18 μm CMOSDACPLL

A 1 MHz Bandwidth 6 GHz 018 22m CMOS Type-I 16Fractional-N Synthesizer for WiMAX

一款6 GHz Type-I分数分频PLL，采用噪声消除DAC和离散时间采样保持环路滤波器，带宽1 MHz。

6 GHz, 1 MHz带宽, 0.01 ppm精度, 60 MHz频率步进, 11 μs锁定时间, 102 dBc/Hz@300 kHz, 130 dBc/Hz@3 MHz

分数分频合成器锁相环量化噪声Sigma-Delta调制器宽带

▸噪声消除电荷泵DAC电路：采用创新的噪声消除技术，通过DAC电路有效降低量化噪声超过25 dB，显著提升系统信噪比，属于电路级创新。

▸固有线性PFD（相位频率检测器）：设计了一种具有固有线性特性的PFD，避免了传统PFD的非线性问题，提高了相位检测的精度和稳定性，属于方法创新。

▸离散时间采样保持环路滤波器：引入离散时间采样保持技术，优化了环路滤波器的性能，使其在1 MHz带宽下仍能保持低噪声和高稳定性，属于系统级创新。

▸高集成度与低功耗设计：在0.18微米CMOS工艺下实现6 GHz频率合成器，仅消耗26 mA电流，展示了高性能与低功耗的完美结合，属于工艺与设计协同创新。

Abstract

E, Waleed Khalil , Member , IEEE, and Bertan Bakkaloglu , Senior Member , IEEE Abstract—A 6 GHz Type-I fractional- PLL with noise-can- celling DAC and discrete-time sample and hold loop-ﬁlter is presented. The 1 MHz bandwidth PLL utilizes an inherently linear PFD and noise-cancelling charge-pump DAC circuit to reduce quantization noise by more than 25 dB. The worst case near-integer in-band spur is measured at 61 dBc and the inte- grated RMS phase error is 42 dBc. The measured in-band phase no