A HIGH PRECISION CLOSE-LOOP PROGRAMMABLE CMOS DELAY GENERATOR FOR UWB AND TIME DOMAIN RF APPLICATIONS

作者：Xu Rui^*; Nguyen Cam

来源：Microwave and Optical Technology Letters, 2011, 53(2): 390-392.

DOI：10.1002/mop.25732

• phase locked loops
• delay lines
• CMOS integrated circuits
• CMOS RFIC
• UWB systems

This article presents a novel programmable high precision delay generator with adjustable digital control for ultra-wideband and time-domain RF applications. Ring oscillator based phase locked loop (PLL) is embedded to achieve desired propagation delay in the delay cell against process, temperature, and power supply variations. A replica inverter delay line parallel to the PLL offers a separate delay path for input clock. Sub-nanosecond delay step with high accuracy can be obtained by shaping the input clock slope and keeping a careful matching between the replica delay line and the delay cell in PLL. The prototype of the delay generator is implemented on a 0.18-mu m CMOS process. The measurement results show relative delay error of 0.8%. The circuit consumes 9.5 mA from a 1.8-V power supply.

• 出版日期2011-2