A 2.4GHz 2Mb/s Versatile PLL-Based Transmitter Using Digital Pre-Emphasis and Auto Calibration in 0.18µm CMOS for WPAN

📋 论文概要

本文提出一种全集成2.4GHz 2Mb/s PLL发射机，采用数字预加重和自动校准技术，在0.18µm CMOS工艺上实现，满足IEEE802.15.4和蓝牙1.2标准。通过避免使用量化噪声消除技术，实现了60%的芯片面积和50%的功耗节省。

💡 主要创新点

• 采用数字预加重和自动校准技术，在不使用量化噪声消除的情况下满足发射性能要求。
• 通过ΔΣ分数-N PLL架构实现GFSK和GMSK调制，兼容双标准。
• 相比传统方案，大幅降低芯片面积和功耗，同时符合FCC发射规范。

📄 原文摘要

A fully integrated 2.4GHz 2Mb/s transmitter which is part of a highly integrated WPAN RF transceiver SoC using a 0.18µm RFCMOS 1P6M process is presented. The transmitter uses a ∆Σ fractional-N PLL architecture. It transmits 2Mb/s GFSK and GMSK modulated signals and is compliant with the IEEE802.15.4 and Bluetooth 1.2 standards. The transmitter consumes 18mA at 3dBm output power and occupies 1.1mm2. The transmitter does not use any quantisation noise cancellation techniques leading to 60% die area and 50% power consumption savings compared to [1,2], yet meets the FCC emission regulations in restricted bands with 12dB margin. It uses a novel calibration system that maintains a worst-case RMS phase error of 8.4° for 2Mb/s GMSK in the presence of ±50% variation in the PLL closed-loop bandwidth (CLBW). The calibration system consumes 0.4mA for a period of 66µs, which is significantly less power-consuming than a recently reported scheme [3].

👥 作者与机构

H. Shanan, G. Retz, K. Mulvaney, P. Quinlan

Analog Devices, Cork, Ireland