Title :
A duty cycle control circuit for high speed applications
Author :
Tajalli, Armin ; Mehrmanesh, Saeid ; Atarodi, Mojtaba
Author_Institution :
Dept. of Electr. Eng., Shariff Univ. of Technol., Tehran, Iran
Abstract :
An accurate and programmable CMOS duty-cycle control (DCC) circuit for high-speed applications is discussed. Proposed DCC circuit has a first order transfer function the accuracy of which is just limited by the on-chip device mismatch. Operating at 1GHz frequency, the duty-cycle of the output clock can be tuned between 45 to 60% by changing the charge and discharge currents of a charged-pump circuit (CPC). CPC´s current is controlled through five controlling bits. The circuit is designed in a 0.18μm CMOS technology and draws 160μA from a 1.8V supply with less than 0.3×LSB error.
Keywords :
CMOS analogue integrated circuits; analogue processing circuits; delay lines; high-speed integrated circuits; transfer functions; 0.18 micron; 1 GHz; 1.8 V; 160 muA; CMOS technology; charge currents; charged-pump circuit; discharge currents; duty cycle control circuit; first order transfer function; high speed applications; on-chip device mismatch; output clock; programmable CMOS; Character generation; Circuit optimization; Clocks; Communication system control; Delay; Frequency; Pulse width modulation; Pulse width modulation converters; Tuned circuits; Tuning;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328311
