Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Flicker noise conversion in CMOS LC oscillators: capacitance modulation dominance and core device sizing
KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Elektroniksystem. KTH, Skolan för informations- och kommunikationsteknik (ICT), Centra, VinnExcellence Center for Intelligence in Paper and Packaging, iPACK.
Visa övriga samt affilieringar
2011 (Engelska)Ingår i: Analog Integrated Circuits and Signal Processing, ISSN 0925-1030, E-ISSN 1573-1979, Vol. 68, nr 2, s. 145-154Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Flicker noise upconversion mechanisms in oscillators have been acquired in the literature, however their relative weights are still under investigation. It is desirable to find the dominant one, since a certain noise suppression method reduces one mechanism but may increase another. In this work, we propose a systematic simulation method to distinguish their relative impacts. The outcome indicates parasitic capacitance is the dominant factor for both tail 1/f noise and switch pair 1/f noise upconversions, implying to use small dimension core devices. Design guidelines on sizing devices are presented and two suppression techniques are compared. Two voltage-controlled oscillators (VCOs) with these suppression techniques are fabricated in a 0.18 mu m CMOS process, allowing us to compare their performance. The two VCOs can be Focused-Ion-Beam (FIB) trimmed to change the width of switch pair FETs. The fair comparison of measurement results among them verify the dominant role of parasitic capacitance in 1/f noise upconversion. The measurement results also confirm the design guidelines and demonstrate the difference of two suppression methods.

Ort, förlag, år, upplaga, sidor
2011. Vol. 68, nr 2, s. 145-154
Nyckelord [en]
Oscillator, VCO, Device sizing, Flicker noise, 1/f noise, Phase noise
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-37144DOI: 10.1007/s10470-011-9650-5ISI: 000292649900002Scopus ID: 2-s2.0-80052441633OAI: oai:DiVA.org:kth-37144DiVA, id: diva2:432376
Forskningsfinansiär
ICT - The Next GenerationTillgänglig från: 2011-08-03 Skapad: 2011-08-02 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Ingår i avhandling
1. Low Noise Oscillator in ADPLL toward Direct-to-RF All-digital Polar Transmitter
Öppna denna publikation i ny flik eller fönster >>Low Noise Oscillator in ADPLL toward Direct-to-RF All-digital Polar Transmitter
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In recent years all-digital or digitally-intensive RF transmitters (TX) have attracted great attention in both literature and industry. The motivation is to implement RF circuits in a manner suiting advanced nanometer CMOS processes. To achieve that, information is encoded in the time-domain rather than voltage amplitude. This enables RF design to also benefit from CMOS process scaling. In this thesis an improved architecture of a digitally-intensive transmitter is proposed and validated experimentally. The techniques to lower oscillator phase noise and all-digital phase-locked loop (ADPLL) quantization noise are discussed and proved by both simulation and measurements.

The impact of device sizing on 1/f^2 phase noise is analyzed and validated by measurements. Seven oscillators in 180-nm CMOS with the same LC-tank, operation frequency and power consumption but different core device width are compared. The conclusion clarify the different suggestions on device sizing in the literature. It is illustrated that tail noise contribution is strongly positive dependent to core device sizing, while the contribution of core devices themselves is weakly dependent. Measurements demonstrate that there is a 14-dB phase noise increase when sizing core devices from 40 um to 280 um in the case of noisy tail current. If tail current is clean, the increase is only 4 dB.  For 1/f^3 phase noise, the investigation reveals that the capacitance modulation is the dominant factor accounting for the 1/f or flick noise up-conversion, which is proved by measurements of 180-nm CMOS designs.   A class-C oscillator with ensured start-up and constant amplitude is presented. It achieves a 3.9-dB phase noise reduction in theory and 5-dB reduction in measurements, compared to a conventional LC-tank oscillator operating at the same frequency and power. With the help of a digital bias voltage and bias current control loop, a 191 Figure-of-Merit (FoM) is achieved, showing the ability for low power and noise application.   The previous oscillator optimization techniques have been applied in designing a digital controlled oscillator (DCO) for an ADPLL. A fine tuning varactor is proposed to reduce quantization noise, achieving a frequency step of only several hundreds Hz. In order to measure this small frequency step when the DCO is free-running, a method based on the narrow-band frequency modulation (FM) theory is proposed. The ADPLL wide-band FM is fulfilled by using a digital two-point modulation so that the modulation bandwidth is not limited by the ADPLL loop dynamic.

Finally an all-digital polar TX is proposed based on an improved architecture. The ADPLL is used for FM while a one-bit low-pass Sigma Delta modulator using the phase modulated ADPLL output as the clock accomplishes amplitude modulation. A simple AND gate is adopted to increase the fundamental power as mixers. A class-D power amplifier stages diliver 6.8-dBm power to antenna through a on-chip band-pass pre-filter. The filter also acts as single-ended to differential-end conversion and matching network.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. xi, 97
Serie
Trita-ICT-ECS AVH, ISSN 1653-6363 ; 13:03
Nyckelord
all-digital, digitally-intensive, frequency modualtion, phase modulation, amplitude modulation, polar, transmitter, oscillator, digital controled oscillator, DCO, VCO, voltage controled oscillator, class-C oscillator, class-D PA, ADPLL, phase noise, RF, CMOS.
Nationell ämneskategori
Elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-118818 (URN)978-91-7501-643-6 (ISBN)
Disputation
2013-03-13, Sal D, KTH-Forum, Isafjordsgatan 39, Kista, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2013-02-28 Skapad: 2013-02-28 Senast uppdaterad: 2013-02-28Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Sök vidare i DiVA

Av författaren/redaktören
Chen, JianJonsson, FredrikZheng, Li-Rong
Av organisationen
ElektroniksystemVinnExcellence Center for Intelligence in Paper and Packaging, iPACK
I samma tidskrift
Analog Integrated Circuits and Signal Processing
Teknik och teknologier

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 569 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf