A Study of a MOS VCO Circuit by Using a Current–Controlled Differential Delay Cell

Yasuhiro SUGIMOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E77-A   No.11   pp.1929-1931
Publication Date: 1994/11/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section of Letters Selected from the 1994 IEICE Spring Conference)
MOS analog circuit,  PLL,  VCO,  current control,  differential delay cell,  

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A MOS VCO which has improved linearity of oscillation frequency versus control voltage and has no 1/2 divider is studied. The improved VCO characteristic has been obtained by the use of only two additional transistors, one of which has a role of a load and another of which has a role of a control current source in a differential type delay cell.