New SAW Oscillators for Land Mobile Telephone Radio Unit

Urabe, S.; Saito, Shigeki; Kanmuri, N.

doi:10.1109/mwsym.1983.1130897

Cited by 8 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since surface acoustic wave (SAW) resonators are advantageous in reducing the size and weight of devices, they are widely used for high-frequency filters [1,2] and voltage-controlled oscillators (VCO) [3][4][5] in mobile communications terminals. High-frequency VCOs are required to have an expanded variable range of oscillation frequency and reduced sideband phase noise.…”

Section: Introductionmentioning

confidence: 99%

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Isobe

Hikita

Asai

2005

Electron Comm Jpn Pt II

View full text Add to dashboard Cite

SUMMARYA Love-wave SAW propagating on a thick Al grating on a LiNbO 3 piezoelectric substrate exhibits a resonant characteristic with an extremely small capacitance ratio γ (= 3.0) while it elastically couples with Rayleigh waves in a complex manner. In the application to a resonator, the Rayleigh wave becomes spurious and must be suppressed sufficiently. With a view to development of a broadband SAW resonator for a VCO, the propagation/reflection characteristics of this Love-wave/Rayleigh-wave configuration are analyzed. The following results are found by simulation and experiments. (1) Both the Love wave and Rayleigh wave have extremely wide reflection bandwidths. (2) Two types of spurious Rayleigh wave appear in the resonant characteristics. (3) The stopband of the Rayleigh wave is superior in reflection characteristic to the Love wave. It is also demonstrated experimentally that a broadband SAW-VCO can be realized if the VCO oscillation frequency is chosen within the Rayleigh wave stopband after the Al film thickness is optimized.

show abstract

Section: Introductionmentioning

confidence: 99%

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Isobe

Hikita

Asai

2005

Electron Comm Jpn Pt II

View full text Add to dashboard Cite

show abstract

“…Therefore, SAW filters for cellular phones, SAW diplexers [13], and timing extraction high-Q filters for optical communication [4] have already been developed. However, it is generally difficult to take a wide tuning range of the oscillation frequency [6,7]. However, it is generally difficult to take a wide tuning range of the oscillation frequency [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the voltage-controlled oscillator (VCO) using a SAW resonator [5] is advantageous for miniaturization with an excellent C/N. However, it is generally difficult to take a wide tuning range of the oscillation frequency [6,7].…”

Section: Introductionmentioning

confidence: 99%

Fabrication method for grating‐mode‐type SAW resonator used in voltage‐controlled oscillator: optimum shape for electrode fingers and investigation of accurate process techniques

Asai¹,

Hikita²,

Isobe³

et al. 2001

Electron. Comm. Jpn. Pt. II

View full text Add to dashboard Cite

SUMMARYAn optimum electrode finger shape is obtained for the grating-mode-type SAW resonator on a 15° YXLiNbO 3 with a large relative bandwidth used for a high-C/N broadband VCO. Spurious responses by Rayleigh wave need to be suppressed completely in the SAW resonator. Its impedance characteristics are extremely sensitive to the variations of electrode finger linewidth and film thickness. The specifications for the film thickness and linewidth of the electrode finger are derived by simulation and experiment. It is demonstrated that the electrode finger film thickness of h/O 0 = 0.1325 and the relative electrode finger linewidth ratio of L / L S 0.575 are standard and their deviations need to be controlled accurately in fabrication. Assuming applications to industrial wireless terminals at 170 and 420 MHz, process accuracy enhancement is discussed so that the electrode finger specifications are satisfied. In the present SAW resonator with a thick electrode finger, an antireflection film is introduced in the photoresist process. Al-Cu alloy is used for the electrode fingers to produce an excellent impedance characteristic. The VCO using the present SAW resonator satisfies the specifications of the above wireless terminals. © 2001 Scripta Technica, Electron Comm Jpn Pt 2, 84(9): 1120, 2001

show abstract

“…Laser cooling extends this property to the optical region as demonstrated in [5], where an The very long-lived D levels of Ball (49 s for D~j~ [ 6] and 34.5 s for D,j~ [7]) provide 6~Sjj~-5~D~j~I-rtransition at 1.76 [16]) and precise spectroscopic data are required to build dynamic models for understanding these phenomena. Finally, knowledge of [20], with laser cooling on two to three ions at a temperature lower than I K [21], and on a single ion at 130 mK [22]. In spite of the fact that ultimate qualities for the optical transitions will be reached only in the presence of a few ions (or only one) with a highly-stabilised laser, we started by confining a Ca+ ion cloud.…”

mentioning

confidence: 99%

Investigations of a r.f. stored Ca⁺ ion cloud and observation of the S-D forbidden transitions

Knoop¹,

Vedel²,

Vedel³

1994

J. Phys. II France

View full text Add to dashboard Cite

show abstract

New SAW Oscillators for Land Mobile Telephone Radio Unit

Cited by 8 publications

References 3 publications

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Fabrication method for grating‐mode‐type SAW resonator used in voltage‐controlled oscillator: optimum shape for electrode fingers and investigation of accurate process techniques

Investigations of a r.f. stored Ca⁺ ion cloud and observation of the S-D forbidden transitions

Contact Info

Product

Resources

About

New SAW Oscillators for Land Mobile Telephone Radio Unit

Cited by 8 publications

References 3 publications

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Love‐wave‐type/Rayleigh‐wave‐type SAW resonators with thick Al‐grating structure

Fabrication method for grating‐mode‐type SAW resonator used in voltage‐controlled oscillator: optimum shape for electrode fingers and investigation of accurate process techniques

Investigations of a r.f. stored Ca+ ion cloud and observation of the S-D forbidden transitions

Contact Info

Product

Resources

About

Investigations of a r.f. stored Ca⁺ ion cloud and observation of the S-D forbidden transitions