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

fYear

2015

fDate

24-27 May 2015

Firstpage

2253

Lastpage

2256

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems (ISCAS), 2015 IEEE International Symposium on

Conference_Location

Lisbon

Type

conf

DOI

10.1109/ISCAS.2015.7169131

Filename

7169131