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A novel slow-wave structure for microstrip lines is proposed. Unlike conventional slow-wave structures such as photonic bandgap (PBG) and ladder microstrip lines, which only deal with the substrate, ground plane or the signal line of a microstrip separately, the periodic patterns of this new slow-wave structure are etched in both the conductive metal strip and the ground plane of the proposed microstrip...
Direct conversion architectures have the advantage of no image frequencies, fewer components and lower cost. However local oscillator (LO) leakage reduces receive sensitivity, causes LO pulling, and is a challenging problem for direct conversion transceiver design. A mixer using the 2nd-order harmonic of LO is thus desired to address this issue. The sub-harmonic mixer, proposed in this paper, is based...
The fast growing wireless communication systems have brought on a constant demand for low cost, low power and highly-integrated portable devices. In response to the evolution, the research and development of RF integrated circuits using low cost CMOS processes has been increased dramatically. A phase-locked loop (PLL) is a negative feedback control system which generates a signal with fixed phase...
In this paper, a low power receiver utilizing a resonant transformer circuit at 20 GHz to decrease the antenna/system sizes to meet the smart dust system (SDS) millimeter size space requirement was designed. The resonator transformer generates relatively large voltages and facilitates diode-based demodulation. The receiver was designed for low power SDS applications at 20 GHz. The chip has been taped...
Accurate prediction of circuit aging and its variability is essential to reliable design and analysis. Such a capability further helps reduce the load in statistical reliability test. Based on the physical understanding of circuit aging effects, we develop a predictive short term and long term model to characterize NBTI-induced threshold voltage degradation (??Vth) at transistor level. Due to process...
In this paper challenges of integrating millimetre-wave bandpass filters on CMOS are discussed. A new compact 57-66 GHz 4th-order cross-coupled SIR-MH bandpass filter was designed and fabricated on 0.13 mum bulk CMOS. Both simulation and measurement results are presented. The measurement results show 8.5 GHz bandwidth from 58-66.5 GHz, 5.9 dB insertion loss, and better than 10 dB return loss over...
A multi standard direct conversion receiver for digital video broadcast application is presented. This receiver supports MediaFLOtrade, DVB-H and ISDB-T standards. Broadband multi-standard operation is achieved with a reconfigurable LNA, broadband mixer, programmable bandwidth baseband filter, wide tuning range LC VCO with a fully integrated fractional-N synthesizer. A high linearity signal path enables...
The paper shows how to take advantage of device temperature operating characteristics to obtain a temperature sensor, and use it to help generate a low-power temperature-insensitive oscillator. The oscillator serves as a carrier frequency generation circuit in an on-off-keying (OOK) transceiver system. We have described a low power temperature insensitive oscillator for radio frequency wireless communication...
In this paper we present a 1.2V 2mW low power OOK fully integrated receiver implemented using 0.13mum CMOS technology. Low power radio frequency transceiver circuits are critical blocks in wireless sensor network (WSN) applications. The receiver operates at 2.2 GHz in this test module, and applies OOK modulation. Low power radio frequency transceiver circuits are critical blocks in wireless sensor...
With communication systems designed for operation in the millimeter wave frequencies it is now possible to have most of the transceiver implemented on a single CMOS die. An important system component that is required to ensure regulatory compliance is the RF bandpass filter. Unfortunately to date RF bandpass filters have been difficult to integrate on CMOS because of filter size and undesirable performance...
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