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The high order mode oscillation and parasitic RF output have serious influence on the normal operation and the purity of the output spectrum of MBKs. A new method to suppress the high order modes will be introduced in this paper. By putting selective absorbing material on coupling slot of the double-gap coupling cavity, all the high order modes with π mode field structure can be suppressed effectively...
This paper presents the effects of a deep n-well junction on RF circuit performance based on a 0.35um SiGe technology. With a combination of measurement and field solver results, it shows that the deep n-well yields about 20 dB of isolation and eliminates the inter-block noise coupled through the substrate in certain degree. The isolation varies with different junction voltage and at different frequency...
This paper presents a CMOS receiver front-end for ultra-wideband (UWB) wireless applications within the 3.1-10.6 GHz band. Fabricated in a 0.13 um CMOS technology, the packaged and ESD-protected receiver integrates a broadband low-noise amplifier (LNA), a quadrature downconversion mixer, and local oscillator (LO) amplifiers. The LNA employs a noise-canceling technique to decouple input match from...
This paper presents a custom IC that provides an efficient interface between an ultra-low power RF rectifying antenna (rectenna) source and a microbattery, with the goal of maximum power harvesting. The energy harvester IC uses current-starved circuitry, a non-overlapping gate-drive, and a sub-threshold current source to achieve a nominal supply current in the 200 nA range for VDD = 2.5 V. Experimental...
A novel RF sensing circuit for a cognitive radio to sense spectral environment is proposed using injection locking and frequency demodulation techniques. The research starts with deriving a generalized locking equation for oscillators as a theoretical basis, and then develops the sensing principle and circuit architecture to a practical and useful level. To accurately evaluate the sensing performance,...
Low-cost testing of integrated RF substrates is necessary to reduce their production cost. In this paper a new low-cost test approach is proposed for testing an integrated RF substrate with embedded RF passive filters. As compared to a conventional test method the proposed test method reduces the test-setup cost by around 40%. The proposed method enables testing of embedded RF filters by one-port...
This paper presents a novel RF receiver front-end using only one shared tail current for low power application. The 5 GHz receiver front-end RFIC includes a voltage controlled oscillator (VCO), a double balanced mixer and a low noise amplifier (LNA) in a cascoded topology. The receiver RFIC was implemented in a 0.5 m SiGe BiCMOS technology. The VCO oscillation frequency is around 5 GHz, targeting...
The emergence of digital mobile broadband communication systems for voice, data, multimedia and positioning is coupled to the continuous progress of silicon CMOS-technology. Single chip integration with digital part while maintaining excellent RF performance, high integration density, low power consumption and low cost under mass production aspects are the current system design challenges. This paper...
RF transceivers have recently migrated to low-cost digital deep-submicron CMOS processes, where their integration with baseband processors and memory serve to form low cost SoC solutions for various radio standards. Such process environment, optimized for digital logic and SRAM memory, is extremely restrictive for conventional analog and RF designs. This tutorial presents recently developed techniques...
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