A 380 MHz Direct Digital Synthesizer/Mixer With Hybrid CORDIC Architecture in 0.25 $\mu{\hbox {m}}$ CMOS
A 380 MHz Direct Digital Synthesizer/Mixer With Hybrid CORDIC Architecture in 0.25 $\mu{\hbox {m}}$ CMOS
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DOI：
10.1109/jssc.2006.886527
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发表时间：
2007
影响因子：
5.4
通讯作者：
D. Caro;N. Petra;A. Strollo
中科院分区：
文献类型：
--
作者：
D. Caro;N. Petra;A. Strollo
本文介绍了一个380 MHz，13位，直接数字合成器/混频器集成电路在0.25妈妈CMOS工艺的实施。该电路采用了一种创新的架构，将正交合成器/混频器中所需的π/4旋转操作分为三个旋转。前两个旋转是通过使用完全实现进位保存算法的CORDIC数据路径来实现的。CORDIC旋转的方向是并行计算的，对于第一次旋转，使用一个小的查找表，对于第二次旋转，使用一个常数乘法和加法电路。最后（第三）旋转是基于乘法器的，以减少电路延迟并提高电路性能。CORDIC数据路径是在算法级和晶体管级上用一种新的方法实现的。在算法级，提出了符号扩展预防、溢出预防和一种新的舍入方案的组合使用。在晶体管级的设计风格，联合使用全CMOS和DPL，以改善电路的延迟进行了描述。整体电路性能非常有趣。该合成器/混频器IC采用0.25 μ m CMOS工艺实现，面积为0.22 mm 2，在380 MHz和2.5 V电源电压下功耗为152 mW
The paper describes the implementation of a 380 MHz, 13 bit, direct digital synthesizer/mixer IC in 0.25mum CMOS technology. The circuit employs an innovative architecture which divides the pi/4 rotation operation required in the quadrature synthesizer/mixers, in three rotations. The first two rotations are implemented by using a CORDIC datapath completely realized in carry-save arithmetic. The directions of the CORDIC rotations are computed in parallel by using a little lookup table, for the first rotation, and a multiply by constant and addition circuit for the second rotation. The final (third) rotation is multiplier-based, in order to reduce the circuit latency and increase the circuit performances. The CORDIC datapath is implemented with a novel approach both at the algorithmic level and at the transistor level. At the algorithmic level the combined employ of sign-extension prevention, overflow prevention and a novel rounding scheme are presented. At the transistor level a design style that jointly uses full-CMOS and DPL to improve the circuit latency is described. The overall circuit performances are very interesting. The synthesizer/mixer IC, realized in a 0.25 mum CMOS technology, has an area occupation of 0.22 mm2 and dissipates 152 mW at 380 MHz with a supply voltage of 2.5 V