Push‐push voltage controlled dielectric resonator oscillator using a LTCC technology

A new push-push phase-locked dielectric resonator oscillator (PLDRO) with dual-band (C/Ku) output capability is presented. An out-of-phase Wilkinson power combiner is used to provide the fundamental ( f 0 ) output. The phase-locking is implemented at f 0 as an alternative to direct locking the push-push output frequency (2f 0 ) using prescalers. The push-push PLDRO has shown a fundamental suppression of 35.12 dBc and a second-harmonic suppression of 34.77 dBc at the 2f 0 output and the f 0 output, respectively. Experimental results also indicate a maximum spur level of 277.4 dBc, and phase noise values of 2109.6 and 2143 dBc/Hz at 10 kHz and 1 MHz offsets, respectively, from a 12.6 GHz carrier.Introduction: For low phase noise applications, such as satellite communication and radar, it is desirable to phase lock the free running push-push dielectric resonator oscillator (DRO) [1-3] to a high stable crystal oscillator for further improving the phase noise. The phaselocking can be implemented at f 0 , or at 2f 0 . In [3], a push-push PLDRO is designed by locking the 2f 0 . However, the use of a high frequency prescaler increases the cost and power consumption of the system. Lee et al.[4] designed a 60 GHz planar-type push-push VCO with an integrated frequency divider working near 30 GHz. As a result, a 60 GHz frequency synthesiser can be realised by locking relative lower frequencies. Besides the phase noise considerations, next generation wireless systems, such as multimode transreceivers and cognitive radios, require the push-push DRO to have dual-band output capability.Thus, the f 0 signal should also be coupled out at the condition that the fundamental suppression and phase noise of the 2f 0 output are not deteriorated. Moreover, the output power of the f 0 signal should be sufficient for local oscillator applications.This Letter introduces a new push-push PLDRO. Compared with conventional designs, it provides not only the 2f 0 signal but also the f 0 signal by using an out-of-phase Wilkinson power combiner. Furthermore, as the phase-locking is implemented at the fundamental frequency, the increased phase detector gain helps reduce the risk of locking failures and phase noise. The concept proposed here can also be applied to millimetre-wave PLDRO designs where phase-locking becomes more difficult.

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“…2, the fundamental suppression is 35.12 dBc. The fundamental suppression is better than that in [1][2][3]. Fig.…”

mentioning

confidence: 67%

“…Introduction: For low phase noise applications, such as satellite communication and radar, it is desirable to phase lock the free running push-push dielectric resonator oscillator (DRO) [1][2][3] to a high stable crystal oscillator for further improving the phase noise. The phaselocking can be implemented at f 0 , or at 2f 0 .…”

mentioning

confidence: 99%

Fundamental wave phase-locked dual-band push-push DRO using out-of-phase Wilkinson power combiner

Cao

Tang

2010

Electron. Lett.

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“…A typical all-optical sampling oscilloscope consists of a resonator or a delay line and a sampler [2]. The purpose of including the resonator (delay line) into the oscilloscope is to replicate incoming data pulses to allow sampling and detection at lower frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…If this mode is coupled to a pair of parallel microstrip lines, the RF currents in the lines will be forced to flow at opposite direction, resulting in a 180 phase difference between them. This characteristic is very attractive in designing of push-push oscillators [1][2][3][4], where the suboscillators work under out-of-phase condition.…”

Section: Introductionmentioning

confidence: 99%

X‐band low phase noise in‐phase and out‐of‐phase injection‐locked push–push DRO

Cao

Tang

2010

Micro & Optical Tech Letters

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An X-band push-push dielectric resonator (DR) oscillator with injection locking capability has been developed. Two injection locking methods, i.e., the in-phase method and the out-of-phase method, are studied. It is found that the out-of-phase method has wider locking range and much less effects on fundamental suppression than that of the in-phase method. The oscillator generates an output power of 9.5 dBm at 12.4 GHz and has a fundamental suppression of 32.5 dBc. Despite using a high quality (Q) factor DR, wide locking range has been obtained. SiGe HBTs with good flicker noise performance were chosen for low phase noise design. The phase noise values of the free running oscillator are À104.4 dBc/Hz, À120.2 dBc/Hz, and À142.6 dBc/Hz at 10 kHz, 100 kHz, and 1 MHz offsets from the carrier frequency, respectively. The phase noise performance is superior or comparable to the reported designs.

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“…Dielectric resonator oscillators have traditionally been the choice of low-phase-noise oscillators [1,2]. However, the size of dielectric resonator is too small to fabricate precisely at millimeter-wave frequencies because the dielectric resonator has a high-dielectric constant.…”

Section: Introductionmentioning

confidence: 99%

A 94 GHz low‐cost frequency source using a 47 GHz micromachined air‐cavity oscillator and a doubler

Kim

Kwon

Seo

2009

Micro & Optical Tech Letters

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A 94 GHz low‐cost frequency source has been developed using a 47 GHz micromachined air‐cavity oscillator and a 47‐to‐94 GHz doubler on the thin‐film substrate with the flip‐chip interconnection. The 47 GHz micromachined air‐cavity oscillator is a parallel‐feedback configuration using the micromachined air‐cavity as a parallel‐feedback element. As active devices of the oscillator and the doubler, GaAs pseudomorphic high‐electron mobility transistors were flip‐chip mounted on the thin‐film substrate with integrated passives. The developed 94‐GHz frequency source has an output power of about 3 dBm and a low‐phase‐noise of −96 dBc/Hz at 1 MHz offset with an oscillation frequency at 94.25 GHz. This work allows a low‐cost millimeter‐wave frequency source. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 239–241, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24884

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Push‐push voltage controlled dielectric resonator oscillator using a LTCC technology

Abstract: plane cross-polarization of the antenna is quite high especially at Ϸ 60°(theoretical) and Ϸ 40°(measured), it is about Ϫ16 dB at 1.8 GHz, while the E-plane cross-polarization is very low. This is mainly due to the infinite ground plane assumption used in the calculation. CONCLUSIONS

Cited by 8 publications

References 8 publications

Fundamental wave phase-locked dual-band push-push DRO using out-of-phase Wilkinson power combiner

Fundamental wave phase-locked dual-band push-push DRO using out-of-phase Wilkinson power combiner

X‐band low phase noise in‐phase and out‐of‐phase injection‐locked push–push DRO

A 94 GHz low‐cost frequency source using a 47 GHz micromachined air‐cavity oscillator and a doubler

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