A 4–32-GHz Chipset for a Highly Integrated Heterodyne Two-Port Vector Network Analyzer

Nehring, J.; Dietz, Marco; Aufinger, Klaus; Fischer, Georg; Weigel, Robert; Kissinger, Dietmar

doi:10.1109/tmtt.2016.2520483

Cited by 26 publications

(9 citation statements)

References 21 publications

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“…Further experiments will help find out as to which frequency range is more sensitive to the concentration of the corresponding component. 20 The reflection (S 11 ) and transmission (S 21 ) coefficients of the sensor can be measured separately with a vector network analyzer (Figure 1c), which potentially could be replaced by a miniaturized circuit 32,33 for portability. As discussed above, the sensing performance of the microstrip sensor is directly related to its structure (eq 1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Contactless and Simultaneous Measurement of Water and Acid Contaminations in Oil Using a Flexible Microstrip Sensor

Xue

Tang

et al. 2019

ACS Sens.

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The assessment of the petroleum product quality often involves multiple indicators, among which water content and acid value are two major parameters. The complexity of an oil sample and the narrow space in pipeline transport make it difficult to monitor the oil quality in real-time. Considering the practical requirements, a new type of flexible microstrip sensor is proposed in this work. The shape and line width of the microstrip sensor are studied and optimized by theory and experiments. The proposed square spiral-based microstrip sensor has good water content detection resolution at high frequencies with less acid interference, and it can determine the acid value in the low-frequency band. The sensor surface is further passivated, protecting it from direct contact with the oil sample to enhance the electrochemical robustness, and still achieves good detection linearity and high sensitivity. After encapsulation on a flexible substrate, the proposed microstrip sensor realized the non-contact determination of the water content and acid value of oil at the same time, which is only a few millimeters in size and can conform to various tubing wall shapes. Due to the fact that the manufacture of the sensor is CMOS-compatible, we expect it to be readily applied to many other miniaturized chemical-sensing applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Contactless and Simultaneous Measurement of Water and Acid Contaminations in Oil Using a Flexible Microstrip Sensor

Xue

Tang

et al. 2019

ACS Sens.

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“…which is due to the typical characteristic of a varactor [21]. It can be observed, e.g., in [10] and [11] as well as in Section III. This is beneficial, as ( 5) and ( 4) are multiplied in (2).…”

Section: Conceptmentioning

confidence: 60%

“…where it depends on the parameters G 1 and G 2 of the realized PLL, whether the minimum tuning voltage V t,min or the maximum tuning voltage V t,max has to applied to (11). The proportional part in ( 6) can be used to minimize the influence of the inversely proportional part by optimizing the parameters of the CN V c,0 and V c .…”

Section: Conceptmentioning

confidence: 99%

“…The realization of a wideband voltage-controlled oscillator (VCO) is one major issue. Since wideband VCOs exhibit a high variation of the VCO gain over the output frequency [10], [11], which is increasing with the tuning range, the loop gain of the PLL also varies in a wide range over the output frequency. Thus, the loop filter design can only be optimized for a small range of the output frequency, which is typically close to the center frequency.…”

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confidence: 99%

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An Ultra-Wideband Fast Frequency Ramp Synthesizer at 60 GHz With Low Noise Using a New Loop Gain Compensation Technique

Delden

Pohl

Musch

2018

IEEE Trans. Microwave Theory Techn.

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Phase-locked loops (PLLs) for ultra-wideband, low noise, and linear frequency ramp synthesis exhibit a wide variation of the loop gain, if no compensation method is applied. This impairs the performance of the PLL and the corresponding microwave measurement systems. To overcome the disadvantages of existing compensation techniques, we present a new compensation method based on a phase-frequency detector gain modulation. This offers low hardware complexity and avoids additional noise. Furthermore, we present an ultra-wideband, low noise monolithic microwave-integrated circuit for 60-GHz PLLs. Based on this, a 60-GHz frequency synthesizer with a modulation bandwidth of 22 GHz and a jitter of less than 79 fs at the center frequency are realized. The new compensation technique reduces the variation of the loop gain from 14.2:1 to 1.67:1 and is compared with an existing compensation technique utilizing a voltage-dependent damping network, which reduces the variation of the loop gain to 1.78:1. Due to the reduction of the variation of the loop gain, the maximum ramp slope increases from 22 GHz/2.9 ms up to 22 GHz/0.35 ms. In addition, the time jitter of the output signal of the PLL decreases by up to 18%. Furthermore, the PLL performance is constant in the temperature range from 0 • C to 70 • C.

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“…While the EM simulation directly provides R b,1/2 , L b,1/2 , and K 1/2 , we calculated the other component values using equations (3)- (7). The resulting values of the components of the equivalent circuit are depicted in Fig.…”

Section: Yig Modelingmentioning

confidence: 99%

A Low-Noise Transmission-Type Yttrium Iron Garnet Tuned Oscillator Based on a SiGe MMIC and Bond-Coupling Operating up to 48 GHz

Delden

Pohl

Aufinger

et al. 2019

IEEE Trans. Microwave Theory Techn.

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Wideband and low-noise tunable oscillators at microwave frequencies are crucial within microwave frequency synthesizers and key to high-end measurement systems based on electromagnetic sensing in the microwave range as well as in the terahertz (THz) and sub-THz range. This paper presents a novel, wideband, and low-noise differential yttrium iron garnet (YIG) tuned oscillator. It is based on a SiGe monolithic microwave integrated circuit and a transmission-type YIG resonator. The integrated circuit contains a fully differential amplifier as a part of the oscillator core. The resonator was realized by two orthogonal, crossed pad-to-pad bonds and an YIG sphere, which is positioned between those bonds and the integrated circuit. To design and optimize the oscillator, an equivalent circuit modeling the resonator was developed. Concerning the tuning range and the phase noise, the results of the circuit simulations are in good agreement with the measurements. Two oscillators with different lengths of the inductive load transmission line were realized. First, the oscillator with a short transmission line offers very high-oscillation frequencies with a tuning range from 32.0 to 48.2 GHz. It exhibits an excellent phase noise of less than −119 dBc/Hz at an offset frequency of 100 kHz for oscillation frequencies up to 42 GHz. Second, the oscillator with a longer transmission line length offers a tuning range from 19.1 to 41.4 GHz. This configuration exhibits an excellent phase noise of less than −120 dBc/Hz at an offset frequency of 100 kHz for oscillation frequencies up to 38 GHz. Index Terms-Low noise source devices, microwave and millimeter wave oscillators, SiGe HBT circuits, ultra-wideband sources devices, yttrium iron garnet (YIG). I. INTRODUCTION M ICROWAVE frequency synthesizers are key to high-end measurement systems based on electromagnetic (EM)

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A 4–32-GHz Chipset for a Highly Integrated Heterodyne Two-Port Vector Network Analyzer

Cited by 26 publications

References 21 publications

Contactless and Simultaneous Measurement of Water and Acid Contaminations in Oil Using a Flexible Microstrip Sensor

Contactless and Simultaneous Measurement of Water and Acid Contaminations in Oil Using a Flexible Microstrip Sensor

An Ultra-Wideband Fast Frequency Ramp Synthesizer at 60 GHz With Low Noise Using a New Loop Gain Compensation Technique

A Low-Noise Transmission-Type Yttrium Iron Garnet Tuned Oscillator Based on a SiGe MMIC and Bond-Coupling Operating up to 48 GHz

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