Results 161 to 170 of about 186,677 (204)

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

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

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

Quadrature Delay-Locked Oscillator

CLEO 2025
A voltage-controlled oscillator (VCO) is stabilized using optical delay lines, improving the VCO temperature stability by more than a factor of three. A four-tap delay line provides quadrature optical signals suitable for on-chip clocking applications.
Henry Love, Firooz Aflatouni
openaire   +1 more source

Exponentially tunable voltage controlled quadrature oscillator

2017 40th International Conference on Telecommunications and Signal Processing (TSP), 2017
This paper deals with appropriate method of tunability extension in quadrature oscillators. Exponential dependence of frequency of oscillations on DC control voltage is created in lossless integrators by utilization of two exponentially controlled variable gain amplifiers and diamond transistors.
Roman Sotner, Jan Jerabek, Jiri Petrzela, Ondrej Domansky, Winai Jaikla, Tomás Dostál   +5 more
openaire   +1 more source

A Familiy of SiGe Quadrature Oscillators for Microwave Applications

2005 IEEE International Symposium on Circuits and Systems, 2005
A family of quadrature oscillators for operation in the 14-26 GHz range has been designed in a 0.25 /spl mu/m SiGe BICMOS technology with an f/sub t/ of 47 GHz. These oscillators employ a transmission line tank, an emitter degenerated cross-coupled pair, and SiGe HBT or CMOS 50 /spl Omega/ buffers.
Brian Welch, Jing-Hong Conan Zhan, Kevin T. Kornegay   +2 more
openaire   +1 more source

A low-voltage quadrature log-domain oscillator

9th International Conference on Electronics, Circuits and Systems, 2003
A new quadrature oscillator is proposed in bipolar technology. It exploits the exponential nature of bipolar transistors and thus it is suitable for low distortion operation at low supply voltage. The resulting circuits are very simple in structure and easy to design.
Nikos Fragoulis, Ioannis Haritantis
openaire   +2 more sources