Title :
High-speed and high-linearity ring oscillator based pulse width modulator
Author :
Taewook Kim ; Jun Liu ; Maghari, Nima
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL, USA
Abstract :
In this paper, a new pulse width modulation (PWM) converter is proposed. This structure converts the analog input signal to a PWM waveform using only inverters/charge-pumps in combination with passive elements. Thus, the proposed PWM converter does not need any operational amplifier. The added feedback path current can be used to adjust the required duty-cycle of the PWM conversion based on the dynamic range of the input signal. The behavior of the proposed PWM converter is formulated and simulated in a 0.13μm CMOS technology. From the simulation results, the proposed PWM converter achieves 74dB linearity and draws only 1.0mA at 500MHz from 1.0V supply in a 0.13μm process.
Keywords :
PWM power convertors; charge pump circuits; comparators (circuits); feedback oscillators; PWM converter; current 1.0 mA; feedback path current; frequency 500 MHz; high-linearity ring oscillator; high-speed ring oscillator; passive elements; pulse width modulator; size 0.13 mum; voltage 1.0 V; Charge pumps; Clocks; Inverters; Linearity; Pulse width modulation; Pulse width modulation converters; Pulse width modulation (PWM); analog to digital converter (ADC); charge-pump; comparator; inverter;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7169131
