Results 131 to 140 of about 1,826 (183)

Phase noise and accuracy in quadrature oscillators

2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512), 2004
This paper proposes a complete analysis of quadrature-coupled LC oscillators. These oscillators operate off-resonance and for this reason, their phase noise worsens at increasing coupling strength. Since the coupling transistors raise the total power consumption, the noise-power product degrades further with respect to a stand-alone oscillator.
ROMANO', LUCA, LEVANTINO, SALVATORE, BONFANTI, ANDREA GIOVANNI, SAMORI, CARLO, LACAITA, ANDREA LEONARDO   +4 more
openaire   +2 more sources

A quadrature RC-oscillator with capacitive coupling

Integration, 2016
In this paper the capacitive coupling in quadrature RC-oscillators is investigated. The capacitive coupling has the advantages of being noiseless with a small area penalty and without increasing the power dissipation. The results show that a phase error below 1?
João Casaleiro, Luís B. Oliveira, Igor M. Filanovsky   +2 more
openaire   +2 more sources

A quadrature relaxation oscillator-mixer in CMOS

Proceedings of the 2003 International Symposium on Circuits and Systems, 2003. ISCAS '03., 2003
This paper describes the design of a quadrature cross-coupled oscillator circuit integrated which also realizes the mixer function in a phase lock loop (PLL). This should be able to provide a very accurate phase relation (
Luís Bica Oliveira, Jorge R. Fernandes, Michiel H. L. Kouwenhoven, Chris van den Bos, Chris J. M. Verhoeven   +4 more
openaire   +1 more source

CONTINUATION ANALYSIS OF A PHASE/QUADRATURE ELECTRONIC OSCILLATOR

Journal of Circuits, Systems and Computers, 2010
An RF phase-quadrature oscillator is analyzed. The designer "ensured" the phase-quadrature working condition through a suitable cross-coupled electrical connection between the two parts composing the complete oscillator. Through a detailed analysis of the dynamics of this oscillator, we show that device mismatch can lead to an unexpected stable ...
Federico Bizzarri, Daniele Linaro, Marco Storace, Angelo Brambilla   +3 more
openaire   +3 more sources

DDCCTA-based quadrature oscillator

2013 Eleventh International Conference on ICT and Knowledge Engineering, 2013
This paper presents a voltage-mode quadrature oscillator employing a differential difference current conveyor transconductance amplifier and all-grounded passive devices. The use of grounded passive devices makes the proposed circuit ideal for integrated circuit implementation.
Montree Kumngern, Anusorn Auttaput, Kobchai Dejhan   +2 more
openaire   +1 more source

On transconductance-C quadrature oscillators

International Journal of Electronics, 1997
Two circuits of Electronically Tunable Quadrature Oscillators (ETQOs) are given, which only use operational transconductance amplifiers (OTAs) and capacitors. In these circuits, a wide range of linear ƒo-tunability is present with bias voltage/current control of the OTAs.
MUSLIM T. AHMED, IQBAL A. KHAN, NIGAR MINHAJ   +2 more
openaire   +1 more source

Quadrature oscillators using CCIIs

International Journal of Electronics, 2005
Three third-order quadrature oscillators are proposed. Outputs of two sinusoids with 90° phase difference are available in each quadrature oscillator circuit. The oscillation condition and oscillation frequency of each proposed quadrature oscillator are orthogonal controllable. All proposed circuits employ only grounded capacitors.
Jiun-Wei Horng *, Chun-Li Hou, Chun-Ming Chang, Wen-Yaw Chung, Han-Wei Tang, Yao-Hsin Wen   +5 more
openaire   +1 more source

A quadrature oscillator for LTE/LTE-A standards with an improved quadrature-mode stability

2015 IEEE International Symposium on Circuits and Systems (ISCAS), 2015
This paper introduces a quadrature oscillator for LTE/LTE-A standards with an improved quadrature mode stability using transformers. In Inductor-based (L-based) quadrature voltage controlled oscillators (QVCO), there exist two stable quadrature modes. When a transformer is used in place of an inductor in a QVCO, it is shown that the selected quadrature
Amany El-Gouhary, Nathan M. Neihart
openaire   +1 more source

CMOS digitally programmable quadrature oscillators

International Journal of Circuit Theory and Applications, 2008
AbstractCMOS digitally programmable quadrature oscillators based on digitally controlled current followers and voltage followers are proposed. The proposed designs provide the advantage of programmability similar to the operational transconductance amplifier‐based oscillators while offering improved linearity.
openaire   +1 more source

A 5.8-GHz Quadrature Cross-Coupled Oscillator

Analog Integrated Circuits and Signal Processing, 2003
This paper describes an implementation of a quadrature cross-coupled relaxation oscillator to be used in an OFDM RF frontend transceiver. A prototype of the oscillator was realized in a Si-Ge BiCMOS technology, and an oscillator frequency of 5.8 GHz was obtained, which is 1/6 of the maximum f/sub T/ of the bipolar transistors.
J.R. Fernandes, M.H.L. Kouwenhoven, C. van den Bos, K. van Hartingsveldt, C. Verhoeven   +4 more
openaire   +1 more source