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A low-power fully-integrated transceiver for K-band wireless communication was developed using 0.18 μm SiGe BiCMOS technology. Transformers are used to stack circuit blocks directly and to connect signals in multiple paths, and a balun is used to combine differential signals efficiently. These passive-interstage circuit schemes make it possible to reduce power dissipation without degradation in performance...
A low-power transmitter mixer and a receiver mixer operating in the K-band frequency region have been developed. Both mixers can be operated at a low supply voltage of 1.5 V because of a pseudo-stacked configuration using an on-chip transformer. For the transmitter mixer, an emitter degeneration resistor in parallel with a capacitor is introduced to obtain both high linearity and high-gain. Moreover,...
A 20-GHz 1-V VCO with dual-transformer configuration and a self-stabilized pseudo-static frequency divider were developed using 0.18-mum SiGe BiCMOS technology. For the VCO, a combination of two types of transformers, which exhibit high-input impedance and capacitive-input impedance, contributes to the output of two sets of differential signals for mixers and the divider, maintaining both a wide frequency-tuning...
We have developed a novel piezoelectric accelerometer with digital output for ultra-low power wireless sensor nodes. The accelerometer is composed of an array of piezoelectric parallel-plate capacitor structures that are joined together in series and connected to a CMOS switch array. This composition makes it possible to realize a digital output accelerometer in which the number of on-state CMOS switches...
Design techniques for a low-power mixer operating in the quasi-millimeter-wave frequency region were developed. A pseudo-stacked configuration and a pre-biasing technique, to reduce supply voltage and dynamic current consumption, respectively, were introduced. Furthermore, a gain-boosting technique, which actively utilizes a parasitic resonant caused by a transformer and parasitic capacitor, improves...
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