Now showing items 1-20 of 43

  • 5GHz CMOS all-pass filter-based true time delay cell 

    Aghazadeh, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza (2018-12-22)
    Article
    Open Access
    Analog CMOS time-delay cells realized by passive components, e.g., lumped LC delay lines, are inefficient in terms of area for multi-GHz frequencies. All-pass filters considered as active circuits can, therefore, be the ...
  • Active inductor-based tunable impedance matching network for RF power amplifier application 

    Saberkari, Alireza; Ziabakhsh, Saman; Martínez García, Herminio; Alarcón Cot, Eduardo José (2015-08)
    Article
    Open Access
    This paper presents the use of a new structure of active inductor named cascoded flipped-active inductor (CASFAI) in a T-type high-pass tunable output matching network of a class-E RF power amplifier (RFPA) to control the ...
  • Active inductor–based tunable impedance matching network for RF power amplifier application 

    Saberkari, Alireza; Ziabakhsh, Saman; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016-01)
    Article
    Open Access
  • Analysis and evaluation of using a tuning inductance on the performance of gilbert cell-based CMOS sub-harmonic mixer 

    Saberkari, Alireza; Shokouhi, Shahriar B.; Alarcón Cot, Eduardo José; Baghersalimi, Gholamreza (2012)
    Article
    Restricted access - publisher's policy
    The effect of using a tuning inductance on the performance of a Gilbert cell-based two level transistor CMOS sub-harmonic mixer is investigated. The tuning inductor used between the RF and LO switching stages causes ...
  • An efficient CMOS LDO-assisted DC/DC buck regulator 

    Shirmohammadli, V.; Saberkari, Alireza; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016)
    Conference report
    Restricted access - publisher's policy
    In this paper, a new structure based on linear-assisted DC-DC buck converter principle is proposed. Using a segmented LDO regulator instead of the conventional linear one in the hybrid scheme, reduces the difference between ...
  • An efficient CMOS LDO–assisted DC/DC buck regulator 

    Shirmohammadli, V.; Saberkari, Alireza; Martínez García, Herminio; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Open Access
  • An output-capacitorless FVF-based low-dropout regulator for power management applications 

    Shirmohammadli, V.; Saberkari, Alireza; Martínez García, Herminio; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    This paper presents an output-capacitorless low dropout (LDO) regulator based on improved flipped voltage follower power stage for use in power management circuits. A new error amplifier (EA) structure, named as gain-bandwidth ...
  • CMOS fast transient low-dropout regulator 

    Saberkari, Alireza; Alarcón Cot, Eduardo José; Shokouhi, Shahriar B. (Institute of Electrical and Electronics Engineers (IEEE), 2012)
    Conference report
    Restricted access - publisher's policy
    In this paper a fast transient response CFA-based low-dropout regulator (LDO) is introduced. The circuit is stable for 0-100mA output load current and a 1μF output capacitor without any internal compensation. The CFA ...
  • CMOS RF first-order all-pass filter 

    Aghazadeh, Seyed Rasoul; Martínez García, Herminio; Saberkari, Alireza; Alarcón Cot, Eduardo José (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
    Conference report
    Open Access
    In this paper, a wide-band first-order voltage-mode all-pass filter is presented. Due to a simple structure and appropriate performance of the proposed all-pass filter, this filter achieves a flat group delay of over 60 ...
  • Design and comparison of flipped active inductors with high quality factors 

    Saberkari, Alireza; Ziabakhsh, Soheil; Martínez García, Herminio; Alarcón Cot, Eduardo José (Institution of Electrical Engineers, 2014-05-19)
    Article
    Restricted access - publisher's policy
    A new design based on the flipped-structure for RF active inductors is presented. The conventional flipped-active inductor (FAI) composed of only two transistors is considered as a starting structure. However, it suffers ...
  • Design and implementation of a sliding-mode controller for digital low-dropout/linear regulators 

    Baheri, Javad; Saberkari, Alireza; Khorgami, Omid; Alarcón Cot, Eduardo José (2018-03-20)
    Article
    Open Access
    This paper presents an approach to utilize of sliding-mode (SM) controller in digital low-dropout/linear regulators. Various design aspects, including the extraction of the regulator state-space model and sliding coefficients ...
  • Design of broadband CNFET LNA based on extracted I-V closed-form equation 

    Saberkari, Alireza; Khorgami, Omid; Bagheri, Javad; Madec, Morgan; Hosseini Golgoo, Seyed Mohsen; Alarcón Cot, Eduardo José (2018-03-31)
    Article
    Open Access
    A procedure of extracting a closed-form user-friendly I-V equation for short channel carbon nanotube field-effect transistors (CNFET) in the saturation region is presented by employing a relation between CNFET parameters ...
  • Double-frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs 

    Saberkari, Alireza; Shirmohammadli, V.; Martínez García, Herminio; Alarcón Cot, Eduardo José (2015-09-17)
    Article
    Open Access
    This paper proposes the use of double-frequency (DF) buck converter architecture consisting of a merged structure of high and low frequency buck cells as a candidate topology for envelope elimination and restoration (EER) ...
  • Double–frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs 

    Saberkari, Alireza; Shirmohammadli, V.; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016-05)
    Article
    Open Access
    This paper proposes the use of double-frequency (DF) buck converter architecture consisting of a merged structure of high and low frequency buck cells as a candidate topology for envelope elimination and restoration (EER) ...
  • Double–frequency buck converter as a candidate topology for integrated envelope elimination and restoration applications in power supply of RFPAs 

    Saberkari, Alireza; Shirmohammadli, V.; Martínez García, Herminio; Alarcón Cot, Eduardo José (2016-05)
    Article
    Open Access
  • Enhancing the performance of output-capacitorless LDO regulators by pass-transistor segmentation 

    Shirmohammadli, V.; Saberkari, Alireza; Martínez García, Herminio; Alarcón Cot, Eduardo José (Institute of Electrical and Electronics Engineers (IEEE), 2016)
    Conference report
    Restricted access - publisher's policy
    This paper deals with a circuit proposal along with theoretical analysis to provide a solution for enhancing the stability and transient performance of external capacitorless low-dropout regulators (CL-LDOs) by segmenting ...
  • Fast transient current-steering CMOS LDO regulator based on current feedback amplifier 

    Saberkari, Alireza; Alarcón Cot, Eduardo José; Shokouhi, Shahriar B. (2013-03)
    Article
    Restricted access - publisher's policy
    This paper presents a current-steering approach to implement a fast transient response low-dropout regulator (LDO) based on a current feedback amplifier (CFA) topology. The circuit does not require any internal compensation ...
  • Four-quadrant linear-assisted DC/DC voltage regulator 

    Martínez García, Herminio; Saberkari, Alireza (2016-04-23)
    Article
    Open Access
    This Mixed Signal Letter presents a proposal of four-quadrant linear-assisted DC/DC voltage regulator. In this topology, a class-AB linear voltage amplifier assists a four-quadrant switching DC/DC converter in order to ...
  • Four–quadrant linear–assisted DC/DC voltage regulator 

    Martínez García, Herminio; Saberkari, Alireza (2016-07)
    Article
    Open Access
    This Mixed Signal Letter presents a proposal of four-quadrant linear-assisted DC/DC voltage regulator. In this topology, a class-AB linear voltage amplifier assists a four-quadrant switching DC/DC converter in order to ...
  • Fully-integrated CMOS LDO regulator based on an embedded current-mode capacitor multiplier 

    Saberkari, Alireza; Martínez García, Herminio; Fathipour, Rasoul; Alarcón Cot, Eduardo José (2015-04-01)
    Article
    Restricted access - publisher's policy
    This article presents a fully-integrated CMOS output-capacitorless low-dropout voltage regulator (LDO). A capacitor multiplier based on a current-mode amplifier is embedded into the error amplifier of the aforementioned ...