Results 1  10
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105
Bluetooth  A New LowPower Radio Interface Providing ShortRange Connectivity
 Proceedings of the IEEE
, 2000
"... this paper, we review the Bluetooth technology, a new universal radio interface enabling electronic devices to connect and communicate wirelessly via shortrange connections. Motivations for the air interface design and radio requirement decisions are discussed. Frequency hopping, interference resis ..."
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this paper, we review the Bluetooth technology, a new universal radio interface enabling electronic devices to connect and communicate wirelessly via shortrange connections. Motivations for the air interface design and radio requirement decisions are discussed. Frequency hopping, interference resistance, and the concepts of ad hoc connectivity and scatternets are explained in detail. Furthermore, Bluetooth characteristics enabling lowcost singlechip implementations and supporting low power consumption are discussed
A 12bit 75MS/s pipelined ADC using openloop residue amplification
 IEEE J. SolidState Circuits
, 2003
"... Abstract—Precision amplifiers dominate the power dissipation in most highspeed pipelined analogtodigital converters (ADCs). We propose a digital background calibration technique as an enabling element to replace precision amplifiers by simple powerefficient openloop stages. In the multibit first ..."
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Cited by 37 (0 self)
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Abstract—Precision amplifiers dominate the power dissipation in most highspeed pipelined analogtodigital converters (ADCs). We propose a digital background calibration technique as an enabling element to replace precision amplifiers by simple powerefficient openloop stages. In the multibit first stage of a 12bit 75MSamples/s proofofconcept prototype, we achieve more than 60 % residue amplifier power savings over a conventional implementation. The ADC has been fabricated in a 0.35 m doublepoly quadruplemetal CMOS technology and achieves typical differential and integral nonlinearity within 0.5 LSB and 0.9 LSB, respectively. At Nyquist input frequencies, the measured signaltonoise ratio is 67 dB and the total harmonic distortion is 74 dB. The IC consumes 290 mW at 3 V and occupies 7.9 mmP. Index Terms—Analogtodigital conversion, adaptive systems, calibration, CMOS analog integrated circuits, linearization techniques, parameter estimation. I.
Distortion in elementary transistor circuits
 IEEE Trans Circuits Syst II: Analog and Digital Signal Processing
, 1999
"... Abstract—In this paper the distortion components are defined for elementary transistor stages such as a singletransistor amplifier and a differential pair using bipolar transistors or MOST’s. Moreover, the influence of feedback is examined. Numerical examples are given for sake of illustration. Ind ..."
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Abstract—In this paper the distortion components are defined for elementary transistor stages such as a singletransistor amplifier and a differential pair using bipolar transistors or MOST’s. Moreover, the influence of feedback is examined. Numerical examples are given for sake of illustration. Index Terms—Amplifiers, distortion, feedback, intercept point. I.
A 1.3V 5mW fully integrated tunable bandpass filter at 2.1 GHz in 0.35m CMOS
 IEEE J. SolidState Circuits
, 2003
"... ment LC bandpass biquad programmable in, , and peak gain is implemented in 0.35 m standard CMOS technology. The filter uses a resonator built with spiral inductors and inversionmode pMOS capacitors that provide frequency tuning. The tuning is through an adjustable negativeconductance generator, w ..."
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Cited by 15 (3 self)
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ment LC bandpass biquad programmable in, , and peak gain is implemented in 0.35 m standard CMOS technology. The filter uses a resonator built with spiral inductors and inversionmode pMOS capacitors that provide frequency tuning. The tuning is through an adjustable negativeconductance generator, whereas the peak gain is tuned through an input stage. Noise and nonlinearity analyses presented demonstrate the design tradeoffs involved. Measured frequency tuning range around 2.1 GHz is 13%. Spiral inductors with of 2 at 2.1 GHz limit the spuriousfree dynamic range (SFDR) at 31–34 dB within the frequency tuning range. Measurements show that the peak gain can be tuned within a range of around two octaves. The filter sinks 4 mA from a 1.3V supply providing a of 40 at 2.19 GHz with a 1dB compression point dynamic range of 35 dB. The circuit operates with supply voltages ranging from 1.2 to 3 V. The silicon area is 0.1 mm2. Index Terms—LC bandpass filter, radiofrequency (RF) CMOS, tunable filter. I.
Highfrequency distortion analysis of analog integrated circuits,”
 IEEE Trans. Circuits and Systems  11,
, 1999
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Characterization of IIP2 and DCOffsets in Transconductance Mixers
 IEEE Trans. Circuits Syst. II
, 2001
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A Fitting Approach to Generate Symbolic Expressions for Linear and Nonlinear Analog Circuit Performance Characteristics
 In Proceedings Design Automation and Test in Europe Conference
, 2002
"... This paper presents a novel method to automatically generate symbolic expressions for both linear and nonlinear circuit characteristics using a templatebased fitting of numerical, simulated data. The aim of the method is to generate convex, interpretable expressions. The posynomiality of the genera ..."
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Cited by 5 (1 self)
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This paper presents a novel method to automatically generate symbolic expressions for both linear and nonlinear circuit characteristics using a templatebased fitting of numerical, simulated data. The aim of the method is to generate convex, interpretable expressions. The posynomiality of the generated expressions enables the use of efficient geometric programming techniques when using these expressions for circuit sizing and optimization. Attention is paid to estimating the relative `goodnessoffit' of the generated expressions. Experimental results illustrate the capabilities of the approach.
Identification of Wireless Users via Power Amplifier
 Imperfections,” Asilomar Conference on Signals, Systems, and Computers
, 2010
"... Variations in the RF chain of radio transmitters can be used as a signature to uniquely associate wireless devices with a given transmission. Previous approaches, which have varied from transient analysis to machine learning, do not provide verifiable accuracy. Here, we detail a first step toward a ..."
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Cited by 4 (2 self)
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Variations in the RF chain of radio transmitters can be used as a signature to uniquely associate wireless devices with a given transmission. Previous approaches, which have varied from transient analysis to machine learning, do not provide verifiable accuracy. Here, we detail a first step toward a modelbased approach. In particular we exploit differences in nonlinearities of input/output (I/O) characteristics of power amplifiers modeled with Volterra series and develop algorithms for deciding the origin of a given message of interest based on these differences. We consider a generalized likelihood ratio test (GLRT) and a classical likelihood ratio test. For both tests, decision rules are derived and their performance is analyzed. Finally, to establish the viability of the proposed approach, the practical variations among power amplifiers are investigated through simulations and measurements. Results show that the methods can be very effective, when exploiting imperfections of commercially used RF power amplifiers (PAs). Index Terms — Radiometric identification, Volterra series,
Constructing Symbolic Models for the Input/Output Behavior of Periodically TimeVarying Systems Using Harmonic Transfer Matrices
, 2002
"... A new technique is presented for generating symbolic expressions for the harmonic transfer functions of linear periodically timevarying (LPTV) systems, like mixers and PLL's. The algorithm, which we call Symbolic HTM, is based on the organisation of the harmonic transfer functions into a harmo ..."
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A new technique is presented for generating symbolic expressions for the harmonic transfer functions of linear periodically timevarying (LPTV) systems, like mixers and PLL's. The algorithm, which we call Symbolic HTM, is based on the organisation of the harmonic transfer functions into a harmonic transfer matrix. This representation allows to manipulate LPTV systems in a way that is similar to linear timeinvariant (LTI) systems, making it possible to generate symbolic expressions which relate the overall harmonic transfer functions to the characteristics of the building blocks. These expressions can be used as design equations or as parametrized models for use in simulations. The algorithm is illustrated for a downconversion mixer.