Title :
A programmable 8-bit, 10MHz BW, 6.8mW, 200MSample/sec, 70dB SNDR VCO-based ADC using SC feedback for VCO linearization
Author :
El-Halwagy, Waleed ; Dessouky, Mohamed ; El-Ghitani, Hassan
Author_Institution :
Dept. of Electron. & Commun. Eng. (ECE), Ain Shams Univ. (ASU), Cairo, Egypt
Abstract :
A low power linearized 8-bit VCO-based ADC is presented. The proposed ADC employs a differential VCO coupling technique to enhance the VCO time resolution and a linearization switched capacitor feedback loop for improving the SNDR and VCO linearity. The loop added the programmability property to the ADC performance. The 200MSample/sec ADC was implemented in 130nm CMOS process showing an SNR/SNDR ranging from 91.4/88.3dB to 54.3/41.2dB for an input bandwidth of 500kHz-100MHz while consuming a total of 6.78mW from a 1.2V supply. The process insensitive linearization loop improves the VCO linearity from 2% to 0.17%.
Keywords :
CMOS integrated circuits; analogue-digital conversion; linearisation techniques; low-power electronics; programmable circuits; switched capacitor networks; voltage-controlled oscillators; ADC performance; CMOS process; SC feedback; VCO linearity; VCO linearization; bandwidth 10 MHz; bandwidth 50 kHz to 100 MHz; differential VCO coupling technique; linearization switched capacitor feedback loop; low power linearized VCO-based ADC; power 6.78 mW; process insensitive linearization loop; programmability property; programmable VCO-based ADC; size 130 nm; time resolution; voltage 1.2 V; word length 8 bit; Adders; Bandwidth; Couplings; Delays; Signal to noise ratio; Tuning; Voltage-controlled oscillators; VCO-based ADC; Voltage-controlled oscillator(VCO); analog-to-digital converter(ADC); calibration; coupled VCO; linearization; switched capacitor feedback; time-based ADC;
Conference_Titel :
Electronics, Circuits, and Systems (ICECS), 2013 IEEE 20th International Conference on
Conference_Location :
Abu Dhabi
DOI :
10.1109/ICECS.2013.6815378
