A 65nm CMOS DCXO System for Generating 38.4MHz and a Real Time Clock from a Single Crystal in 0.09mm2

被引：25

作者：

Griffith, Danielle ^{[1
]}

Duelger, Fikret ^{[1
]}

Feygin, Gennady ^{[1
]}

Mohieldin, Ahmed Nader ^{[1
]}

Vallur, Prasanth ^{[1
]}

机构：

[1] Texas Instruments Inc, Dallas, TX 75243 USA

来源：

2010 IEEE RADIO FREQUENCY INTEGRATED CIRCUITS RFIC SYMPOSIUM | 2010年

关键词：

CMOS; Crystal oscillators; DCXO; digital control; GSM; phase noise; VCXO;

D O I：

10.1109/RFIC.2010.5477325

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

An integrated digitally-controlled crystal oscillator (DCXO) is presented that generates both 38.4MHz and also a 32.768kHz real time clock (RTC) from a single 38.4MHz crystal. The DCXO can startup independently and transition seamlessly in and out of software control. The tuning range is 280ppm with 2ppb/step and guaranteed monotonicity. The phase noise is -135dBc/Hz at 1kHz offset and -146dBc/Hz at 10kHz offset. The current consumption is 5mA from a 1.4V supply in full power mode and 234 mu A in low power mode, including the LDO and all clock buffers. The DCXO is implemented in standard 65nm digital CMOS with a die area of 0.09mm(2).

引用

页码：321 / 324

页数：4