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A complete low power 24 GHz transceiver chain intended for wireless sensor networks is presented. Including standard button cell batteries, the node size is only 1cm3. A specially designed PCB antenna is implemented, which is fed through the substrate from the backside. The RF components are flip chip mounted directly to the feedline to reduce losses. Data transmission at 2400 bps has been demonstrated,...
This paper reviews realization concepts and achievements of wireless sensor nodes and focuses on new developments in the 24 GHz frequency range. The higher frequency offers the advantage of ultra miniaturization and therefore opens new application fields. On the other hand power consumption of the RF-front-end becomes still more challenging than at lower frequencies. It is shown that by applying very...
In this paper, the paper presents a low-power mixer with integrated local oscillator intended for use in a 24 GHz receiver front-end. The chip is realized using HBT GaAs technology. The voltage-controlled oscillator (VCO) provides a tuning range of 18% at a mean frequency of 21 GHz, with a low DC consumption of 21 mW. DC consumption of the mixer part is about 17 mW from a 3 V supply, with a mean gain...
A low power 24 GHz signal generator consisting of a 12 GHz VCO and a frequency doubler in GaAs HBT technology is presented. Overall power consumption is 43 mW at 0 dBm output power, tuning range is 800 MHz for 3 V tuning voltage. The doubler by itself provides 3 dB gain at 13 mW power consumption. Its design is based on harmonic termination of an HBT producing the desired harmonic frequency
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