A Triple-Tuned Ultra-Wideband VCO

Tsuru, Masaomi; Kawakami, Kenji; Tajima, Kazuo; Miyamoto, Koji; Nakane, M.; Itoh, Kenji; Miyazaki, Moriyasu; Isota, Yoji

doi:10.1109/tmtt.2007.913377

Cited by 13 publications

(3 citation statements)

References 58 publications

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“…Hence, LC VCO is a better choice for FM-UWB applications. Furthermore, several LC VCOs operating at the UWB frequencies have been reported [23][24][25][26][27][28][29][30][31] and are widely used in FM-UWB transmitters for RF carrier generation [12][13][14][15], [32][33][34]. Table 1 provides a comparison among the most recent published VCOs operating at the UWB frequencies.…”

Section: Rf Carrier Generationmentioning

confidence: 99%

A Survey on FM-UWB Transceivers

Ali¹,

Shawkey²,

Zekry³

2013

IJCA

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This paper surveys the research on frequency modulated ultrawideband (FM-UWB) transceivers. FM-UWB system uses low modulation index digital FSK followed by high modulation index analog FM to generate a constant envelope UWB signal with a flat power spectral density and steep spectral roll-off. FM-UWB can be seen as an analog implementation of a spread spectrum system with spreading gain equal to the modulation index. FM-UWB system is suitable for low data rate and short-range applications. The advantages of FM-UWB system such as low power consumption, very low radiated power (−41.3 dBm/MHz), good coexistence with other existing wireless technologies, and robustness to interference and multipath making it suitable for Wireless Body Area Network (WBAN) in medical applications. General TermsUltra-wideband (UWB), UWB transceivers.

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Section: Rf Carrier Generationmentioning

confidence: 99%

A Survey on FM-UWB Transceivers

Ali¹,

Shawkey²,

Zekry³

2013

IJCA

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“…Besides, the requirement for multi-standard operation and cost-efficiency makes wideband monolithic microwave integrated circuit (MMIC) voltage-controlled oscillator (VCO) design a hot topic. Although wideband VCO design in hybrid technology has a long history, the design strategy mainly focuses on tuning multiple reactive components [1,2]. To inherit the same strategy on MMIC with acceptable performance, two limitations are challenging: (i) low capacitance ratio (C max / C min ) of on-chip varactors degrades tuning and (ii) low quality factors of components degrade the phase noise.…”

Section: Introductionmentioning

confidence: 99%

Integrated wideband and low phase‐noise signal source using two voltage‐controlled oscillators and a mixer

Lai

Bao

Kuylenstierna

et al. 2013

IET Microwaves, Antennas & Propagation

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This study presents a method to design a wideband signal source based on two voltage‐controlled oscillators (VCOs) with different centre frequencies and a mixer. The principle is to combine three frequency bands to form one wide frequency range. The three bands consist of second harmonic bands from two VCOs and a mixer band that is generated by mixing the two fundamental signals of VCOs to bridge the frequency gap. Apart from the wide tuning range, an additional benefit of a mixer‐based signal source is that the phase‐noise increases ∼3 dB/octave, which is less than the theoretical limit (6 dB/octave) for a fundamental frequency VCO followed by a frequency multiplier or extraction of second harmonic signal from a VCO. A prototype of the proposed signal source implemented in indium gallium phosphide hetero junction bipolar transistor monolithic microwave integrated circuit technology demonstrates both wide frequency tuning range and a very low phase noise. It exhibits a tuning bandwidth extending from 11.8 to 16.7 GHz and the signal's phase noise varies between −91 and −103 dBc/Hz at 100 kHz offset frequency.

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“…In order to cover the wider bandwidth than that of the double tuned VCO, we have already proposed the triple tuned VCO and achieved the oscillation bandwidth of 100% in CKu band [15]. Although the tuned circuit at the collector is different, U. L. Rohde reported on the other triple tuned VCO that achieved the oscillation bandwidth of 100% in S-C band [16].…”

Section: Introductionmentioning

confidence: 99%

A Triple Tuned Ultra-Wideband VCO in X-K Band

Tsuru

Kawakami

Tajima

et al. 2008

2008 38th European Microwave Conference

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We have already proposed a triple tuned Voltage Controlled Oscillator (VCO) for achieving an ultra-wideband characteristic. The fabricated VCO in C-Ku band has achieved the oscillation bandwidth of 5.6GHz-16.8GHz.In this paper, for achieving the wide oscillation bandwidth in the higher frequency band, we proposes a VCO that consists of a MMIC working as an active circuit and external hyper-abrupt junction varacter diodes connect to the MMIC with Au wires. The fabricated VCO in X-K band achieves the oscillation bandwidth of 9.9GHz-21.9GHz and the phase noise of -109.4dBc/Hz +/-2.4dB at 1MHz offset from the carrier. In addition, it is shown that the fabricated VCO achieves the widest oscillation bandwidth and the lowest phase noise in X-K band compared with other reported wideband VCOs.

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A Triple-Tuned Ultra-Wideband VCO

Cited by 13 publications

References 58 publications

A Survey on FM-UWB Transceivers

A Survey on FM-UWB Transceivers

Integrated wideband and low phase‐noise signal source using two voltage‐controlled oscillators and a mixer

A Triple Tuned Ultra-Wideband VCO in X-K Band

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