Title :
Current-controlled oscillator with practical implementation in phase-locked loop
Author :
El-atta, M. A Abou ; El-ela, M. A Abou ; El Said, M.K.
Author_Institution :
Electron. & Commun. Dept., Ain Shams Univ., Cairo, Egypt
Abstract :
A current-controlled oscillator implemented in CMOS technology is presented. The oscillator utilizes a Schmitt-trigger, pass transistors, current mirrors and grounded capacitor with ±3 V power supplies. Simulation was carried out using Pspice 7.1, with SCNA parameters obtained through MOSIS. Simulation results show that, the frequency range of the oscillator is controlled by a DC current over a broad range of values. This ICO is suitable in the design of current-mode phase locked loop. Practical implementation of current-mode PLL based on the AD844 (current feedback operational amplifier from Analog Devices) is also given.
Keywords :
CMOS integrated circuits; SPICE; circuit simulation; current mirrors; electric current control; oscillators; phase locked loops; trigger circuits; AD844 current feedback operational amplifier; Analog Devices; CMOS technology; DC; MOSIS; Pspice 7.1; SCNA parameters; Schmitt-trigger; current mirrors; current-controlled oscillator; current-mode PLL; current-mode phase locked loop; frequency range; grounded capacitor; pass transistors; power supplies; simulation results; CMOS technology; Capacitors; Circuit simulation; Feedback circuits; Frequency; Mirrors; Operational amplifiers; Oscillators; Phase locked loops; Voltage control;
Conference_Titel :
Radio Science Conference, 2002. (NRSC 2002). Proceedings of the Nineteenth National
Print_ISBN :
977-5031-72-9
DOI :
10.1109/NRSC.2002.1022659
