Papers by Markus Helfenstein
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IEEE Circuits and Devices Magazine, 2000
CIRCUIT ANALYSIS By J. David Irwin and C.H. Wu. Prentice Hall, 1999,976 pages. (ISBN 013792714-2)... more CIRCUIT ANALYSIS By J. David Irwin and C.H. Wu. Prentice Hall, 1999,976 pages. (ISBN 013792714-2) Basic Engineering Circuit Analysis by J. David Irwin and C.H. Wu is an introductory textbook to electrical engineering circuit analysis suitable for students in many engineering disciplines, including electrical engineering, computer engineering, and computer science. It provides a solid foundation of basic electrical concepts and circuits. A broad range of topics are covered in well-organized, self-contained parts starting from all the basic concepts in electrical engineering and circuit analysis to more sophisticated, specialized topics. The materials covered include components, Ohm’s law, Kirchhoffs laws, series and parallel c i r cu i t s , nodal a n d loop analysis, Thevenin’s and Norton’s equivalent circuits, resistive and reactive circuits, trans i en t analysis, ac c i r cu i t analysis, poly-phase circuits, mutual inductance, Laplace transform, and Fourier analysis. Several worked examples and applications are included throughout the book, which clarify the theory and strengthen the basic concepts. The integration of relevant up-to-date practical applications emphasizes the usefulness of the material and completes the picture in the student’s minds. The textbook is presented in an excellent and clear way that helps the student and the instructor through the abundance ofworked examples, drill problems and extension exercises, chapter summaries, problem-solving strategies, and practice problems with nice hints. My only remark about this excellent book is to extend the treatment of operational amplifiers and to give introduction to nonlinear electronic circuits. Also, I’d prefer if the book included a simulation tool and more illustrated examples, which are already handled by the author, but in a short way. Finally, the book is very useful and a remarkable contribution to the field of electrical engineering.
2007 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, 2007
I. INTRODUCTION Nowadays the technological trends in electronics are driven by the need for a con... more I. INTRODUCTION Nowadays the technological trends in electronics are driven by the need for a constant in the performance of the actual high-speed high density package. Consequently, the increase in the operational frequencies, together with the line ...
2010 International Conference on Microelectronics, 2010
This paper presents the differences in terms of performance between 65nm and 55nm silicon for aud... more This paper presents the differences in terms of performance between 65nm and 55nm silicon for audio CODECs for mobile application. Based on representative parameters, the differences of these two technologies in terms of performance are discussed.
IEEE Transactions on Circuits and Systems I: Regular Papers, 2012
IEEE Journal of Solid-State Circuits, 2010
In the above titled paper (ibid., vol. 41, no. 6, pp. 1364-1379, Jun. 06), equations (6) and (7) ... more In the above titled paper (ibid., vol. 41, no. 6, pp. 1364-1379, Jun. 06), equations (6) and (7) appeared incorrectly. They are presented correctly here.
IEEE Circuits and Devices Magazine, 2000
is an introductory textbook to electrical engineering circuit analysis suitable for students in m... more is an introductory textbook to electrical engineering circuit analysis suitable for students in many engineering disciplines, including electrical engineering, computer engineering, and computer science. It provides a solid foundation of basic electrical concepts and circuits. A broad range of topics are covered in
IEEE Journal of Solid-State Circuits, 2006
A complete mixed-signal front-end CMOS chip is presented, supporting GSM/EDGE as well as enhanced... more A complete mixed-signal front-end CMOS chip is presented, supporting GSM/EDGE as well as enhanced audio applications. The chosen solution for the transmit section is based on Laurent's approximation of the nonlinear GMSK modulator. This enables burst shaping in the I/Q domain thereby solving the problem of power ramping. Also, up to GPRS class 12 is supported. The receive section on the other hand consists of a low power dual mode continuous-time 61 ADC for I and Q, supporting ZIF and LIF modes of operation and achieving typically 12.5 bit of resolution under production conditions. An on-chip PLL, which supplies all blocks with various clock frequencies, additionally supports clock jitter suppression. The audio section comprises a codec supporting standard formats such as IIS and PCM. It features mono/stereo signaling from various sources in 16 bit quality as well as high-drive buffers for 4 single-ended loads (capacitively coupled). The whole chip is powered from a 1.5/2.65 V supply voltage and consumes 22 mW in paging mode.
International Journal of Technology, Policy and Management, 2010
This paper elaborates a set of specific key R&D indicators (KR&DI) for companies conducting R&D i... more This paper elaborates a set of specific key R&D indicators (KR&DI) for companies conducting R&D in China. Its data foundation consists of two empirical surveys on NXP semiconductors Business Baseband's R&D programme in China, on internal NXP documents and information, on interviews with non-NXP expatriates, and on a thorough literature analysis, comparing other studies on the subject with the NXP surveys. The resulting KR&DI span the specific R&D dimensions of (1) soft aspects such as political, economical, cultural, risk and technology aspects, (2) strategy aspects including Communication, (3) R&D activities including knowledge transfer, location choice, entry motives and know-how protection, (4) IP rights and ethics and (5) HR and managerial aspects. Due to their form as cards, closely modelled on the European Foundation for Quality management (EFQM) toolbox format, the indicators can easily be adapted and deployed by other companies involved in Chinese R&D.
IEEE Transactions on Circuits and Systems I: Regular Papers, 2010
Abstract-A new clockfeedthrough compensation scheme for switched-current systems is proposed. The... more Abstract-A new clockfeedthrough compensation scheme for switched-current systems is proposed. The circuit cancels both the signal dependent and the constant clockfeedthrough term. It is shown that this concept can be used to derive various sample-and-hold circuits, depending on the desired clock frequency, accuracy, and power dissipation. I.
An efficient digital GMSK/8PSK I/Q signal modulator for GSM/EDGE is presented. The solution is ba... more An efficient digital GMSK/8PSK I/Q signal modulator for GSM/EDGE is presented. The solution is based on Laurent's approximation of the non-linear GMSK modulator by a bank of linear, pre-encoded modulators, thus enabling burst shaping in the I/Q domain and therefore solving the problem of power ramping. The solution is compatible to all major transmitter architectures offering an I/Q interface.
The sum-product algorithm (belief/probability propagation) can be naturally mapped into analog tr... more The sum-product algorithm (belief/probability propagation) can be naturally mapped into analog transistor circuits. These circuits enable the construction of analog-VLSI decoders for turbo codes, low-density parity-check codes, and similar codes.
The design of various high-speed interface architectures for off-chip connections to and from ana... more The design of various high-speed interface architectures for off-chip connections to and from analog, iterative VLSI decoders is discussed. It is shown that for applications with high transmission rates and low to medium accuracy, MOSFET-only R-2R ladders in combination with switched-current memory cells are ideally suited, due to their current mode nature as well as their power and area efficiency. It is expected that data rates well above 100 MS/s can be obtained.
The sum-product algorithm (probability propagation) can be mapped directly into analog transistor... more The sum-product algorithm (probability propagation) can be mapped directly into analog transistor circuits. These circuits enable the construction of analog-VLSI decoders for turbo codes, low-density parity-check codes, and similar codes. Patent application pending. This research was supported by the Swiss National Science Foundation under Grant 21-49619.96. Endora Tech AG, Gartenstrasse 120, CH-4052 Basel, Switzerland. E-mail: [email protected] ISI / Electrical Eng., ETH Zentrum, CH-8092 Zürich, Switzerland. E-mail: [email protected] ISI / Electrical Eng., ETH Zentrum, CH-8092 Zürich, Switzerland. E-mail: [email protected] Endora Tech AG, Gartenstrasse 120, CH-4052 Basel, Switzerland. E-mail: [email protected]
1996 IEEE International Symposium on Circuits and Systems. Circuits and Systems Connecting the World. ISCAS 96
The design of switched-current decimators for wide bandwidth video filtering applications is pres... more The design of switched-current decimators for wide bandwidth video filtering applications is presented. Applying topologies with only one input commutator to switched-currents allows the design of high speed polyphase input branches with reduced distortion. These concepts were utilized in the implementation of a linear phase 19 tap FIR filter chip with an amplitude response tailored to video applications. It is expected that the prototype filter implemented in a 0.5~m CMOS process will operate at an input sampling rate of 135MHz and with a decimating factor of 5.
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Papers by Markus Helfenstein