A current-controlled oscillator coarse-steering acquisition-aid for high frequency SOI CMOS PLL circuits

A self-adjusting frequency control circuit for a high-speed phase-locked loop (PLL) system is designed for implementation in a 0.25 /spl mu/m SOI CMOS technology. This coarse-steering circuit uses a current sensor to indirectly detect the running frequency of the VCO/ICO and combine the result gener...

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Bibliographic Details
Main Authors: Yi-Chang, Greeneich, E.W.
Format: Conference Proceeding
Language:English
Subjects:
Circuits
Flip-flops
Frequency control
Frequency conversion
Phase frequency detector
Phase locked loops
Registers
Signal generators
Voltage
Voltage-controlled oscillators
Online Access:Request full text
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Description
Summary:A self-adjusting frequency control circuit for a high-speed phase-locked loop (PLL) system is designed for implementation in a 0.25 /spl mu/m SOI CMOS technology. This coarse-steering circuit uses a current sensor to indirectly detect the running frequency of the VCO/ICO and combine the result generated from a simple frequency comparator to determine an active frequency control range for the PLL. The entire circuit has been simulated with a wide frequency range of 850 MHz and a power supply voltage of 1.8 volts on HSPICE.
DOI:10.1109/ISCAS.1999.780814