Franco Ariel Ramírez Terán

University of Cantabria

92Publications

12H-index

528Citations

Publications 90

Newest

#1Sergio Sancho (UC: University of Cantabria)H-Index: 14

#2Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

Last.María Isabel Pontón Lobete (UC: University of Cantabria)H-Index: 7

view all 4 authors...

A semianalytical method for the global prediction and understanding of the transient dynamics of oscillator circuits is presented. It covers both the linear and nonlinear transient stages, which are related with the circuit generalized eigenvalues, here introduced for the first time. The transient model relies on the application of the implicit function theorem to the harmonic-balance (HB) system, in order to derive a reduced-order nonlinear differential equation from a given observation node. T...

Pole-Zero Identification: Unveiling the Critical Dynamics of Microwave Circuits Beyond Stability Analysis

#1Juan-Mari Collantes (UPV/EHU: University of the Basque Country)H-Index: 14

#2Libe Mori (UPV/EHU: University of the Basque Country)H-Index: 2

Last.Geoffroy Soubercaze-PunH-Index: 7

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The term pole-zero identification refers to obtaining the poles and zeros of a linear (or linearized) system described by its frequency response. This is usually done using optimization techniques (such as least squares, maximum likelihood estimation, or vector fitting) that fit a given frequency response of the linear system to a transfer function defined as the ratio of two polynomials [1], [2]. This kind of linear system identification in the frequency domain has numerous applications in a wi...

Jun 1, 2019 in IMS (International Microwave Symposium)

#1María Isabel Pontón Lobete (UC: University of Cantabria)H-Index: 7

#2Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

Last.Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

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An analysis of self-injection locked oscillators using a slow-wave structure for phase-noise reduction is presented. This structure is the key component of a feedback network, added to an existing oscillator and providing a stable self-injection locking signal. The unit cell of the slow-wave structure is based on a recently proposed configuration, made up of an open-ended stub and a Schiffman section. A tuning capacitor is introduced as an additional parameter, enabling an adjustment of the stru...

Jun 1, 2019 in IMS (International Microwave Symposium)

#1Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

#2Robert C. MelvilleH-Index: 2

Last.Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

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An investigation of coupling-induced hysteresis in free-running oscillators is presented, for possible application in sensors and RF identification (RFID). In its basic form, the phenomenon arises when an inductive element in an oscillator circuit gets magnetically coupled to another inductor in an external (passive) resonator. For a low mutual inductance or coupling, a small dip is observed in the oscillator amplitude curve versus a turning parameter. As demonstrated in this work, when the mutu...

#1Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

#2Sergio Sancho (UC: University of Cantabria)H-Index: 14

Last.Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

view all 4 authors...

The response of chirped oscillators under the injection of independent signals, for spectrum sensing in cognitive radio, and under self-injection, for radio frequency identification, is analyzed in detail. The investigation is performed by means of a semianalytical formulation, based on a realistic modeling of the free-running oscillator, extracted from harmonic-balance simulations or from experimental measurements, through a new characterization technique. In the new formulation, the oscillator...

#1Franco Ariel Ramírez TeránH-Index: 12

#2Sergio SanchoH-Index: 14

Last.Almudena Suárez RodríguezH-Index: 23

view all 4 authors...

This work was supported by the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (ERDF/FEDER) under Project TEC2014-60283-C3-1-R and Project TEC2017-88242-C3-1-R

#1Almudena Suárez RodríguezH-Index: 23

#2María Isabel Pontón LobeteH-Index: 7

Last.Franco Ariel Ramírez TeránH-Index: 12

view all 4 authors...

Advances in the analysis and synthesis of oscillator circuits, using harmonic balance (HB), are presented. They rely on the use of auxiliary generators, which can be introduced into the HB software to impose mathematical conditions or to extract a realistic oscillator model. In particular, a bifurcation-detection technique, for the accurate design of dual-frequency oscillators, and a semi-analytical function, for the prediction of oscillation transients, are described. In dual-frequency oscillat...

Jun 1, 2018 in IMS (International Microwave Symposium)

#1Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

#2Sergio Sancho (UC: University of Cantabria)H-Index: 14

Last.Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

view all 4 authors...

An in-depth investigation of the response of chirped oscillators under injection signals is presented. The study confirms the oscillator capability to detect the input-signal frequencies, demonstrated in former works. To overcome previous analysis limitations, a new formulation is presented, which is able to accurately predict the system dynamics in both locked and unlocked conditions. It describes the chirped oscillator in the envelope domain, where two time scales are used, one associated with...

#1Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

#2Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

A stability and bifurcation analysis of multi-element non-Foster networks is presented, illustrated through its application to non-Foster transmission lines. These are obtained by periodically loading a passive transmission line with negative capacitors, implemented with negative-impedance converters (NICs). The methodology takes advantage of the possibility to perform a stability analysis per subintervals of the perturbation frequency. This will allow an independent analytical study of the low-...

Jan 1, 2018 in IMS (International Microwave Symposium)

#1Franco Ariel Ramírez Terán (UC: University of Cantabria)H-Index: 12

#2Sergio Sancho (UC: University of Cantabria)H-Index: 14

Last.Almudena Suárez Rodríguez (UC: University of Cantabria)H-Index: 23

view all 4 authors...

This work was supported by the Spanish Ministry of Economy and Competitiveness and the European Regional Development Fund (ERDF/FEDER) under research projects TEC2014-60283-C3-1-R and TEC2017-88242-C3-1-R.

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