A 0.3mm2 90-to-770MHz Fractional-N Synthesizer for a Digital TV Tuner

📋 论文概要

本文提出了一款面积仅0.3mm²、频率范围90至770MHz的低杂散分数分频合成器，用于日本数字电视调谐器，解决了多频段覆盖和1/7MHz高频率分辨率的需求。

💡 主要创新点

• 采用分数分频技术实现低杂散输出，满足数字电视调谐器对频谱纯度的严格要求。
• 在0.3mm²的小面积内实现了90至770MHz的宽频率覆盖，适用于ISDB-Tsb、ISDB-Tmm和ISDB-T等多个频段。
• 通过优化电路设计，在保持低功耗的同时实现了1/7MHz的频率分辨率，以支持每个段的接收。

🏷 关键词

📄 原文摘要

Fujitsu Laboratories, Yokohama, Japan Fujitsu Laboratories, Kawasaki, Japan 2 This paper describes a 0.3mm2 and a 90M-to-770MHz range low spurious fractional-N synthesizer, with which mobile receivers for Japanese terrestrial digital broadcasting are equipped. The synthesizer for DTV tuner needs to cover 90Mto-108MHz which is scheduled for ISDB-Tsb, and 170M-to-222MHz which is scheduled for ISDB-Tmm etc, and 470M-to-770MHz for ISDB-T. And the synthesizer needs a frequency resolution of 1/7MHz to receive each segment. In addition, it is demanded that the synthesizer minimize the macro area to reduce costs while maintaining other performance (phase noise, power consumption, tracking time, etc.) from a previous work [1]. It’s known that a fractional-N PLL is effective to realize both a frequency resolution and small area because it can use a reference clock with higher frequency, which enables a higher loop bandwidth (BW) to be obtained, and the capacitance

👥 作者与机构

Masafumi Kondou1, Atsushi Matsuda2, Hiroshi Yamazaki1, Osamu Kobayashi2