Comparative Analysis Of Three Versions Of A Capacitor-Less LDO Structure That Supplies A Rail-To-Rail VCO
Journal Title: Acta Technica Napocensis- Electronica-Telecomunicatii (Electronics and Telecommunications) - Year 2013, Vol 54, Issue 3
Abstract
This paper presents three circuit implementations of a low-dropout voltage regulator (LDO) structure that supplies a rail-to-rail voltage controlled oscillator (VCO) operating at 2.5GHz. The LDOs comprise only a small decoupling capacitor that can be integrated but they are still able to deal with the large and fast variations of the supply current required by the VCO. For a fair and direct comparison, all three LDO versions use the same pass transistor and are designed to maintain the output voltage ripple at the same level. Two symmetrical OTAs – one optimized for low-power consumption and the other for higher-bandwidth and lower noise – and one folded-cascode OTA optimized for low noise were employed successively to implement the error amplifier within the LDO. The comparison focuses on the effect the LDOs have on the phase noise of the VCO they supply. It was found that the VCO phase noise can be improved by reducing the level of high-frequency noise on the VCO supply line, caused by the LDOs.
Authors and Affiliations
Cristian RADUCAN, István KOVÁCS, Paul MARTARI, Marius NEAG
Keywords
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