Journal ArticleDOI
The Effect of Mismatches and Delay on the Quadrature Error of a Cross-Coupled Relaxation Oscillator
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TLDR
A high-level model of cross-coupled relaxation oscillators in terms of circuit parameters is presented, from which explicit equations for duty-cycle, oscillation frequency, and quadrature error are obtained.Abstract:
Cross-coupled relaxation oscillators can produce two highly accurate quadrature output signals (Verhoeven, 1992). We present a high-level model of these oscillators in terms of circuit parameters, from which we obtain explicit equations for duty-cycle, oscillation frequency, and quadrature error. They show the influence on the oscillator performance of component mismatches and other nonideal effects, such as delays. The results provide useful guidelines for the design of high performance oscillators. The theoretical results are confirmed by simulation and by measurements on a test chip.read more
Citations
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Journal IssueDOI
Experimental comparison of phase-noise in cross-coupled RC- and LC-oscillators
Luis B. Oliveira,Ahmed Allam,Igor M. Filanovsky,Jorge R. Fernandes,Chris J. M. Verhoeven,M.M. Silva +5 more
TL;DR: In this article, a cross-coupling of two relaxation oscillators was proposed to reduce the phase-noise and quadrature error of RC-oscillators.
Journal ArticleDOI
An inductorless CMOS quadrature oscillator continuously tuneable from 3.1 to 10.6 GHz
TL;DR: A two-integrator quadrature oscillator, which covers the whole bandwidth of UWB applications, and a circuit prototype in a 130 nm CMOS technology is continuously tuneable from 3.1 to 10.6 GHz.
Journal ArticleDOI
A 5 GHz quadrature relaxation oscillator with mixing for improved testability or compact front-end implementation
TL;DR: In this article, a 5 GHz relaxation oscillator with accurate quadrature outputs and low phase-noise can be obtained, and these favorable properties can be preserved while the mixing function is performed by this oscillator.
Proceedings ArticleDOI
An ISM 2.4 GHz low-IF receiver frontend
TL;DR: A contribution in this paper is a new, more efficient, IQ oscillator/mixer block, where the current is reduced by 25% and reused for the two functions, to be low cost and power efficient.
Proceedings ArticleDOI
A programmable low-pass filter with adaptive miller compensation for zero-IF transceiver
TL;DR: A programmable active-RC low-pass filter is presented with tunable bandwidth realized with a fast tuning circuit suited for a zero-IF transceiver and an on-chip automatic frequency tuning circuit designed to compensate for the errors in on- chip resistance and capacitance caused by process, voltage and temperature variations.
References
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Journal ArticleDOI
Low-IF topologies for high-performance analog front ends of fully integrated receivers
Jan Crols,Michiel Steyaert +1 more
TL;DR: The fundamental principles of the low-IF receiver topology are introduced by applying the complex signal technique-a technique used in digital applications to the study of analog receiver front ends and its performance can be better.
Journal ArticleDOI
A single-chip 900 MHz CMOS receiver front-end with a high performance low-IF topology
Jan Crols,Michiel Steyaert +1 more
TL;DR: In this paper, an analog receiver front end chip realized in a 0.7 /spl mu/m CMOS technology is presented, which achieves a phase accuracy of less than 0.3/spl deg/ in a large passband around 900 MHz without requiring any external component or any tuning or trimming.
Journal ArticleDOI
A 3.1- to 8.2-GHz zero-IF receiver and direct frequency synthesizer in 0.18-/spl mu/m SiGe BiCMOS for mode-2 MB-OFDM UWB communication
A. Ismail,Asad A. Abidi +1 more
TL;DR: In this paper, a direct conversion receiver for UWB applications is presented, which operates for 3.1 to 8.2 GHz and gives a noise figure of 3.3 to 4.1 dB and a conversion gain of 52 dB.
Journal ArticleDOI
A high-frequency electronically tunable quadrature oscillator
TL;DR: In this article, an architecture composed of mutually regenerative oscillators is introduced, which has been used to design a low-noise high-frequency voltage-controlled oscillator (VCO) capable of producing two output signals in quadrature with essentially identical properties.