V–I converter-based voltage-controlled oscillator with improved linear gain characteristic

A voltage–current (V–I) converter-based voltage-controlled oscillator (VCO) is adapted to generate multiple-phase clocks for clock and data recovery for a display driver IC. The proposed V–I converter changed the second-order current equation of the VCO to a first-order current equation of the VCO,...

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Veröffentlicht in:Electronics letters 2015-07, Vol.51 (15), p.1211-1212
Hauptverfasser: Ko, Jaehong, An, Chang-Ho, Kim, Chulwoo, Kim, Soo-Won
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Sprache:eng
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Zusammenfassung:A voltage–current (V–I) converter-based voltage-controlled oscillator (VCO) is adapted to generate multiple-phase clocks for clock and data recovery for a display driver IC. The proposed V–I converter changed the second-order current equation of the VCO to a first-order current equation of the VCO, to achieve a wide operating frequency range, a linear gain (KVCO) within a wide control voltage, low power, and a small area without any extra circuits, such as a low-to-full amplifier. Owing to the V–I converter, KVCO is changed from 8.43 to 2.05 MHz/mV with a wider Vctrl range, and its tuning range is changed from 114 to 452 MHz with a linear gain characteristic. The proposed VCO is implemented in a 1P6M 1.8 V technology and is suitable for the phase-locked loop used in flat-panel display interfaces that operate from 0.3 to 2 Gbit/s.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2015.1628