Person:
Carlosena García, Alfonso

Profile Picture

Email Address

Birth Date

Research Projects

Organizational Units

Job Title

Last Name

Carlosena García

First Name

Alfonso

person.page.departamento

ORCID

0000-0002-7146-4043

person.page.upna

370

Name

Filters

2021 - 20232
Reset filters

Settings

Author: Beloso Legarra, Javier × Subject: Bootstrapping ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    PublicationOpen Access
    A family of alternating current amplifiers for ultra-low frequency operation
    (Wiley, 2021) Martincorena Arraiza, Maite; Carlosena García, Alfonso; Cruz Blas, Carlos Aristóteles de la; Beloso Legarra, Javier; López Martín, Antonio; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Institute of Smart Cities - ISC; Ingeniería Eléctrica, Electrónica y de Comunicación; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    A family of capacitively coupled alternating current (AC) amplifiers featuring ultra-low (below 1 Hz) corner frequency is presented. This is achieved by using high-gain devices which actively boost feedback resistance and thus reduce corner frequency. This procedure is often termed, though with a different purpose, as 'bootstrapping'. The proposed architectures are very general and admit several possible practical implementations. To demonstrate their usefulness, the circuits are implemented with two operational amplifiers (OA), but other active devices such as operational transconductance amplifiers (OTAs) can be alternatively used. All circuits have been theoretically analyzed, extensively simulated and measured, exhibiting high-pass cutoff frequencies as low as 30 mHz.
  • Thumbnail Image
    PublicationOpen Access
    Very-low frequency capacitively coupled AC amplifier with a current feedback operational amplifier
    (Wiley, 2023) Beloso Legarra, Javier; Cruz Blas, Carlos Aristóteles de la; Carlosena García, Alfonso; Martincorena Arraiza, Maite; Ingeniería Eléctrica, Electrónica y de Comunicación; Institute of Smart Cities - ISC; Ingeniaritza Elektrikoa, Elektronikoaren eta Telekomunikazio Ingeniaritzaren; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    In this paper, we propose the idea of using transimpedance amplifiers, in lieu of operational amplifiers (OAs) or transconductance amplifiers (OTAs) to design capacitively coupled AC amplifiers. The idea is demonstrated with a current feedback operational amplifier (CFOA) as an active element, which is actually an architecture consisting of voltage buffers and current copiers (mirrors). This last characteristic is further exploited to make the corner frequency of the AC amplifier tunable by means of bootstrapping low-valued resistors with the output buffer. It is particularly suited to achieve very-low corner frequencies as needed in applications such as bio- or seismic signals. The idea is demonstrated with simulations and experimental results with a discrete implementation.