Implementation of Low Phase Noise Wide-Band VCO with Digital Switching Capacitors

Hsu, Meng‐Ting; Chiu, Chien-Ta; Che, Shiao-Hui

doi:10.5772/8433

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…Based on the above frequency related considerations, the main VCO requires a fractional bandwidth of 47% to cover 2.3-3.7 GHz. Generally, complementary cross-coupled VCOs exhibit a better balance between low phase noise and wide operating bandwidth than nMOS and pMOS cross-coupled VCOs [28]. Therefore, the main VCO is designed with the complementary cross-coupled architecture.…”

Section: B Circuit Designmentioning

confidence: 99%

Enhancement of Frequency Synthesizer Operating Range Using a Novel Frequency-Offset Technique for LTE-A and CR Applications

Peng

Lee

Chen

et al. 2013

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper presents a novel frequency-offset technique to enhance operating range of frequency synthesizers for long-term evolution-advanced and cognitive-radio applications. Conventional wideband frequency synthesizers typically have complex architectures, such as multiple phase-locked loops (PLLs), multiple voltage-controlled oscillators, and multiple mixers, to increase operating range. These complex architectures have high cost and power consumption. In this study, the proposed technique substantially increases the operating range of the frequency synthesizer by using only a single PLL to simultaneously lock two mixing oscillators. The presented frequency synthesizer is implemented using 0.18-m CMOS technology. Performance tests demonstrate that the frequency synthesizer achieves a very wide operating frequency range from 50 MHz to 4.8 GHz with a phase noise lower than 100 dBc/Hz at a frequency offset of 100 kHz. The period of stability for a switching frequency of 40 MHz is shorter than 40 s. Index Terms-Cognitive radio (CR), long-term evolution-advanced (LTE-A), phase-locked loop (PLL), wideband frequency synthesizer, wideband voltage-controlled oscillator (VCO).

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Section: B Circuit Designmentioning

confidence: 99%

Enhancement of Frequency Synthesizer Operating Range Using a Novel Frequency-Offset Technique for LTE-A and CR Applications

Peng

Lee

Chen

et al. 2013

IEEE Trans. Microwave Theory Techn.

View full text Add to dashboard Cite

show abstract

“…De-embedding procedures are becoming increasingly complex and tend to require several dummy patterns (Kolding, 2000b;Vandamme et al, 2001;Wei et al, 2007). The high cost associated with the large area required for dummy patterns is a drawback of advanced de-embedding methods.…”

Section: Thru-only De-embedding For 2-portsmentioning

confidence: 99%

Advanced Microwave Circuits and Systems

Zhurbenko

2010

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Implementation of Low Phase Noise Wide-Band VCO with Digital Switching Capacitors

Cited by 2 publications

References 4 publications

Enhancement of Frequency Synthesizer Operating Range Using a Novel Frequency-Offset Technique for LTE-A and CR Applications

Enhancement of Frequency Synthesizer Operating Range Using a Novel Frequency-Offset Technique for LTE-A and CR Applications

Advanced Microwave Circuits and Systems

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