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Systematic design of supply regulated LC-tank voltage-controlled oscillators
- Source :
- IEEE Transactions on Circuits and Systems-I-Regular Papers. August, 2008, Vol. 55 Issue 7, p1834, 11 p.
- Publication Year :
- 2008
-
Abstract
- Systematic design of low-dropout-regulator (LDO) regulated low-phase-noise LC-tank voltage controlled oscillators (VCOs) is presented. Low-frequency sensitivity profile of power supply induced phase noise of a typical cross-coupled LC-tank VCO is investigated. The relationship between frequency pushing and power supply-induced phase noise is derived. Systematic codesign of VCO sensitivity to low-frequency supply noise with respect to an LDO output noise and power supply rejection profile is introduced. To demonstrate the design approach experimentally, two 2.4-GHz LC-tank VCOs with pMOS and nMOS switching devices powered by PFET LDOs are designed and fabricated on an 0.18-ftm, 7-layer metal CMOS process. By using an integrated LDO, it is shown that the VCO phase-noise sensitivity to low frequency improves by 55 dB at 100-kHz offset. Index Terms--DC-DC power conversion, voltage regulators, phase noise, power supply rejection (PSR), voltage-controlled oscillators (VCOs).
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 55
- Issue :
- 7
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Circuits and Systems-I-Regular Papers
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.184131528