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We present a radio-frequency (RF) sensor and its measurement results of three volatile organic compounds (VOCs) at multiple frequency points from ~ 2 to ~ 11 GHz, which is a convenient range in our examination. The sensor is based on a simple RF interferometer and uses two coplanar waveguides (CPWs), A and B of 5 and 25 mm length, respectively, as VOC sensing electrodes. Approximately 70-nm-thick...
A transmitter with an output frequency range from 341 to 386 GHz is presented. Power output varies from 0.1 to -15.8 dBm along its operating range, while it remains above -2.9 dBm from 341 to 353 GHz. The high-frequency signal is generated using a wideband push-push voltage-controlled oscillator (VCO) with coarse and fine frequency tuning control, a 3-stage power amplifier, and a frequency doubler...
This paper presents a 1–10 GHz low-noise down-convert mixer RFIC suitable for wideband receivers. A switched transconductor mixing core is adopted to reduce noise at high frequencies. By adding a series inductor to the RF transconductor, a flat 4–5 dB noise figure (NF) and a high gain of 26.5 dB can be achieved over a broad bandwidth out to 10 GHz. A CMOS output amplifier is also integrated on-chip,...
A divide-by-2 dynamic frequency divider with a frequency operating range from 47 up to 217GHz, i.e. a bandwidth of 170GHz, in a 130nm SiGe BiCMOS process with cut-off frequency fT =3D250 GHz is presented. To the best of authors’ knowledge, this is the highest operating frequency and bandwidth reported so far in silicon. The divider is based on the regenerative frequency division principle followed...
A W-band double-balanced down-conversion mixer for automotive radars using standard 90 nm CMOS technology is reported. The mixer comprises a double-balanced Gilbert cell with inductive source-degeneration RF transconductance stage for RF-port input matching bandwidth and conversion gain (CG) enhancement, a Marchand balun for converting the single RF input signal to differential signal, a Marchand...
The binary inductive voltage dividers (BIVD) have been designed as the 2∶1 ratio reference at frequencies up to 1MHz. In this paper, the BIVDs are described in detail together with the calibration of their ratio errors by a substitution method. The measurement results of the BIVDs have also been given at frequencies from 1 kHz to 1MHz.
A phase comparator has been developed to compare the phase angle of ac shunts at frequency up to 200 kHz at National Institute of Metrology (NIM) in China. The comparator can supply two currents in which one of the current is two times of the other. With this comparator, the phase angle of two ac shunts can be compared both in nominal current.
A single chip transmitter for automotive FMCW radar application is implemented in 0.18 um SiGe BiCMOS technology. The frequency synthesizer driving a 77 GHz VCO is based on a fractional-N PLL embedding a programmable divider operating at 10 GHz. A 28 bit sigma delta modulator associated to a digital controller enables a versatile generation of FMCW modulation with a resolution of 3 Hz and a linearity...
With the rapid development of the high power microwave source, the power levels have steadily increased. The breakdown of the feed output window is often found in the reflector antennas system. It seriously affects the service life and radiation efficiency of the feed. The paper analyzes the relationship between the max electric intensity in near-field and the field distribution on the aperture. Based...
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