摘要
采用中芯国际(SMIC)公司的0.18μm 1.8 V CMOS工艺设计实现了一款应用于高斯频移键控(GFSK)开环频率调制系统中的数模转换器(DAC)电路。为实现GFSK调制系数可编程,并有效降低DAC电路的功耗和芯片面积,该DAC的低7位数据位通过R-2R梯形结构的二进制加权电阻网络完成高速数模转换功能;同时高3位数据位通过逻辑译码电路调整R-2R梯形电路的偏置电压,实现DAC输出电压幅度的可编程,从而完成了GFSK调制系数的编程控制。芯片测试结果显示,在1.8 V电源电压供电下,当数据转换频率为16 MHz时,DAC能有效完成数模转换功能,消耗电流约为0.55 mA,并且DAC芯片版图面积小于0.02 mm2。
A low-power digital to analog converter （DAC） was fabricated in the SMIC 0. 18 μm, 1.8 V CMOS process, and the DAC was applied in the Gaussian frequency-shift keying （GFSK） open- loop modulator system. In order to achieve a GFSK programmable modulation factor and effectively reduce the chip area and the power dissipation of the digital to analog conversion circuit, the low 7 bits of the DAC were designed to realize high speed data conversion through an R-2R ladder structure of binary weighted resistor network. At the same time, high 3 bits were designed for the programmable function of the DAC output amplitude voltage. The function was completed by adjusting the bias voltage of the R-2R ladder circuit through a logic decoding circuit. Through these methods, the GFSK modulation factor was programmable controlled. Measurement results show that the DAC effectively complete the data conversion function with 1.8 V supply voltage and 16 MHz data conversion frequency. The current consumption of DAC is 0. 55 mA, and the chip area of DAC is less than 0.02 mm2.
出处
《半导体技术》
CAS
CSCD
北大核心
2013年第12期899-904,共6页
Semiconductor Technology
基金
国家科技重大专项03专项基金资助项目(2012ZX03004006)
