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A digital wave filter operating on bandpass sigma-delta (SD) modulated signals is presented in this paper. The filter is obtained by a z-domain transformation of a baseband SD domain filter which is a binary-quantized discrete model of an analog distributed parameter filter (ADPF). Thus, the design properties of various ADPFs can be utilized for constructing the presented type of digital filters....
One of the most important developments in the wireless industry within the last decade was the digitization of RF circuitry. This was in response to the incredible advancements of the mainstream CMOS technology in both processing speed and circuit density, as well as the relentless push to reduce total solution costs through integration of RF, analog and digital circuitry. Since the digital baseband...
Deep sub-micron CMOS technologies have enabled the development of highly digital radios for wireless communications at low Gigahertz frequencies [1], [2]. Meanwhile, nanometer scale CMOS allows to push the RF frequencies to the millimeter wave frequency range. Particularly 60GHz radio has emerged as the candidate for high-data-rate (10 Gb/sec), short-distance (1 to 10m) wireless communication systems...
In this paper, the use of the SB-ZePoC Coding-Scheme for a high precision AC Power-Standard (TET-Watt) is proposed. The use of SB-ZePoC allows a novel approach to binary switched precision-sources, as the switching-rate is low compared to sigma-delta modulation. The structure of the system allows to reference the output amplitude directly to a DC-voltage-reference or switching a binary source directly...
In this paper, the N-phase current driven passive mixer clocked by 1/N duty-cycle clocks is analyzed. The analysis shows that the N-phase passive mixer holds the property of impedance transformation, where it can frequency-translate baseband lowpass impedances into RF frequency to synthesize high-Q bandpass filters. This property can be used to replace the off-chip SAW filter in wireless receivers...
This paper presents analytical expressions for the sensitivity of a low power envelope detector driven by a weak RF signal in the presence of a blocking signal. The envelope detector has been proposed for low power Wake-Up radios in applications such as RFID and wireless sensor systems. The theoretical results are verified with simulations of a modern short channel MOS transistor in a commonly used...
This paper describes how a novel distortion contribution analysis can be used efficiently for improving the linearity of a nonlinear circuit. The distortion analysis technique called Volterra-on-Harmonic-Balance calculates a distortion contributions in each tone and node for each nonlinear elements of the nonlinear devices in the circuit. As the analysis provides large amount of data, also the flow...
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