Noise in High‐Frequency Circuits and Oscillators

Schiek, B.; Rolfes, Ilona; Siweris, Heinz‐Jürgen

doi:10.1002/0470038942

Cited by 40 publications

(16 citation statements)

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“…On the assumption that the intrinsic noise signals are completely uncorrelated the resulting noise voltage Y n of the addition of two output noise voltages V n,A and V n,B can be calculated by [7] …”

Section: Sensor and Setupmentioning

confidence: 99%

Tuning fork for noise suppression in magnetoelectric sensors

Salzer

Jahns

Piorra

et al. 2016

Sensors and Actuators A: Physical

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Section: Sensor and Setupmentioning

confidence: 99%

Tuning fork for noise suppression in magnetoelectric sensors

Salzer

Jahns

Piorra

et al. 2016

Sensors and Actuators A: Physical

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“…From this equation, it is noticeable that amplitude noise occurs when regarding the output signal of the frequency divider outside a PLL [27], [28]. Due to noise-shaping characteristics, this effect is only visible in a region close to the carrier since the phase noise dominates the rest of the spectrum.…”

Section: A Basic Conceptmentioning

confidence: 99%

Synthesis Concepts of Signals With High Spectral Purity for the Use in Impulse Radar Systems

Storch

Musch

2015

IEEE Trans. Instrum. Meas.

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This paper focuses on the synthesis of ultralow-noise signals for the use in a timebase of impulse radar systems. These systems are used in manifold applications and their accuracy is strongly dependent on the spectral purity of the timebase. Current systems use either phase-locked loops (PLLs) or direct digital synthesizers (DDSs). These PLLs comprise an excessive amount of components and recent DDSs still have a low spuriousfree dynamic range (SFDR). Therefore, this paper presents two new approaches for the direct synthesis. They are based on frequency dividers with both short division factor sequences and noise-shaping techniques. Ideas for spur avoidance and noise reduction are described to improve the noise behavior in terms of SFDR and phase noise. The presented approaches have been realized in hardware and measurement results are depicted. For the system using frequency dividers with short division factor sequences, the best results are a SFDR better than 117 dB at a signal frequency of 10.7 MHz. The phase noise level is below −140 dBc/Hz at offset frequencies greater than 1 kHz. Regarding the frequency dividers with noise-shaping techniques, no discrete spurious are visible. The phase noise level at offset frequencies greater than 7 kHz is below −150 dBc/Hz. These results are comparable with state-of-the-art PLL concepts and thus confirm the approaches.Index Terms-All-digital frequency synthesis, direct frequency synthesis, frequency divider, ground penetrating radar, impulse radar (GPR), phase noise, spurious-free dynamic range (SFDR), time-domain reflectometry (TDR), timebase.

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“…Now the QPSK emulator-modulated data are up converted to suitable X-band frequencies as per user selection [12]. The X-band up-converter receives input from Emulator and up converts to 8000-8400 MHz frequency range in synthesized mode for multi-mission operations.…”

Section: Up-/down-convertermentioning

confidence: 99%