Patents by Inventor Maja Atanasijevic-Kunc

Maja Atanasijevic-Kunc has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9294137
    Abstract: A method is performed for a signal transmitted by an RFID interrogator being a radiofrequency electromagnetic sine wave. An amplitude noise contribution RSdAN to a demodulated received signal RSd within a frequency interval of a low-pass filter is determined by means of a measured demodulated transmitted signal TSd as RSdAN=k.TSd in that a dc component DCRS in said demodulated received signal RSd and a dc component DCTS in said demodulated transmitted signal TSd are measured and a conversion factor k is determined as k=DCRS:DCTS. A receiver output signal O is continuously generated out of the received signal by subtracting said amplitude noise contribution RSdAN from the demodulated received signal RSd, filtering the cleaned signal RSd-k.TSd by the low-pass filter and amplifying it. The conversion factor is determined in an exceptionally simplified way as said ratio of said dc components. No receiving interruptions are needed.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: March 22, 2016
    Assignee: AMS R&D ANALOGNI POLPREVODNIKI, D.O.O.
    Inventors: Vinko Kunc, Jernej Rozman, Maja Atanasijevic-Kunc
  • Publication number: 20140335813
    Abstract: A method is performed for a signal transmitted by an RFID interrogator being a radiofrequency electromagnetic sine wave. An amplitude noise contribution RSdAN to a demodulated received signal RSd within a frequency interval of a low-pass filter is determined by means of a measured demodulated transmitted signal TSd as RSdAN=k·TSd in that a dc component DCRS in said demodulated received signal RSd and a dc component DCTS in said demodulated transmitted signal TSd are measured and a conversion factor k is determined as k=DCRS:DCTS. A receiver output signal O is continuously generated out of the received signal by subtracting said amplitude noise contribution RSdAN from the demodulated received signal RSd, filtering the cleaned signal RSd-k.TSd by the low-pass filter and amplifying it. The conversion factor is determined in an exceptionally simplified way as said ratio of said dc components. No receiving interruptions are needed.
    Type: Application
    Filed: November 29, 2012
    Publication date: November 13, 2014
    Inventors: Vinko Kunc, Jernej Rozman, Maja Atanasijevic-Kunc
  • Patent number: 8867989
    Abstract: A calibrating output signal of the transmitter is generated in an interrogator in that a first output signal of a local oscillator is shallowly amplitude-modulated with a pilot signal having a frequency at which a contactless-card encodes data. A receiver reference signal is generated by combining the calibrating output signal of the transmitter and a signal whose carrier signal has a frequency equaling the frequency of the local oscillator signals, conducting the combined signal through a band-pass filter and amplifying it. A first and a second receiver output signals are cleared by subtracting the receiver reference signal, which has been attenuated by a calibrated factor and has a calibrated polarity, from the first and the second receiver output signal, respectively.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: October 21, 2014
    Assignee: AMS International AG
    Inventors: Vinko Kunc, Andrej Vodopivec, Maja Atanasijevic-Kunc, Anton Stern
  • Patent number: 8315585
    Abstract: A difference between an output current signal (mos) of the mixing circuit (MC) and a current from a controlled current source (CCS) is conducted to an input of an operational amplifier (A). A control voltage (cv) for said current source is a voltage at the output of the operational amplifier (A) being filtered by a low-pass filter, whose limiting frequency equals a low frequency limit of the modulation signal in the received signal (rs). The method is speeded up in that the limiting frequency of the low-pass filter is increased by two to three orders of magnitude at the beginning and is gradually lowered to said value. A rather short time duration of the transient process is achieved so that the working point with a low voltage of the DC component and low-frequency components is set at least five times faster than so far.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: November 20, 2012
    Inventors: Vinko Kunc, Anton Stern, Andrej Vodopivec, Maja Atanasijevic-Kunc
  • Patent number: 8138738
    Abstract: According to the method for regulating the supply voltage of an electronic circuit a regulating element with variable resistivity and the outer supply voltage being applied to an input terminal of said regulating element is controlled by an amplified difference between a reference voltage and a part of a regulated supply voltage whereat at first an instant, on which the regulating circuit and the electronic circuit start operating, is detected, and then such value of the reference voltage is set on said instant that the regulated supply voltage will equal a maximum allowable supply voltage of the electronic circuit and the supplied electronic circuit puts itself in a state of a maximum current consumption. Then an operating voltage drop across said regulating element is measured at regular time intervals and the reference voltage is then each time reduced by one degree until said operating voltage drop is below or equals a chosen most appropriate value of said operating voltage drop.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: March 20, 2012
    Inventors: Vinko Kunc, Maja Atanasijevic-Kunc, Andrej Vodopivec
  • Publication number: 20110032080
    Abstract: A calibrating output signal of the transmitter is generated in an interrogator in that a first output signal of a local oscillator is shallowly amplitude-modulated with a pilot signal having a frequency at which a contactless-card encodes data. A receiver reference signal is generated by combining the calibrating output signal of the transmitter and a signal whose carrier signal has a frequency equaling the frequency of the local oscillator signals, conducting the combined signal through a band-pass filter and amplifying it. A first and a second receiver output signals are cleared by subtracting the receiver reference signal, which has been attenuated by a calibrated factor and has a calibrated polarity, from the first and the second receiver output signal, respectively.
    Type: Application
    Filed: April 15, 2008
    Publication date: February 10, 2011
    Inventors: Vinko Kunc, Andrej Vodopivec, Maja Atanasijevic-Kunc, Anton Stern
  • Publication number: 20110034143
    Abstract: A difference between an output current signal (mos) of the mixing circuit (MC) and a current from a controlled current source (CCS) is conducted to an input of an operational amplifier (A). A control voltage (cv) for said current source is a voltage at the output of the operational amplifier (A) being filtered by a low-pass filter, whose limiting frequency equals a low frequency limit of the modulation signal in the received signal (rs). The method is speeded up in that the limiting frequency of the low-pass filter is increased by two to three orders of magnitude at the beginning and is gradually lowered to said value. A rather short time duration of the transient process is achieved so that the working point with a low voltage of the DC component and low-frequency components is set at least five times faster than so far.
    Type: Application
    Filed: February 13, 2009
    Publication date: February 10, 2011
    Inventors: Vinko Kunc, Anton Stern, Andrej Vodopivec, Maja Atanasijevic-Kunc
  • Publication number: 20100090666
    Abstract: According to the method for regulating the supply voltage Uo of an electronic circuit a regulating element with variable resistivity and the outer supply voltage Ui being applied to an input terminal of said regulating element is controlled by an amplified difference between a reference voltage and a part of a regulated supply voltage Uo, whereat at first an instant, on which the regulating circuit and the electronic circuit start operating, is detected, and then such value of the reference voltage is set on said instant that the regulated supply voltage Uo will equal a maximum allowable supply voltage of the electronic circuit and the supplied electronic circuit puts itself in a state of a maximum current consumption.
    Type: Application
    Filed: March 19, 2008
    Publication date: April 15, 2010
    Inventors: Vinko Kunc, Maja Atanasijevic-Kunc, Andrej Vodopivec
  • Patent number: 7696742
    Abstract: The measurement of a very low intensity of an electric current is carried out by 5 integrating the electric current over integration cycles having a time period ti and measuring a peak value of a sawtooth voltage at an integrated circuit output each time at the end of the integration cycle, whereat noise voltage components of a frequency above a cut-off frequency, which has a value of the order of magnitude (0,1×2?×ti)?1, being parts of a voltage of a noise generated in an operational amplifier comprised in the integrated circuit are filtered out of the said sawtooth voltage and noise components, which have the origin in the high-frequency voltage components of Johnson noise, which appear in the low-frequency spectral part of the sawtooth voltage as aliasing, are subtracted from a filtered sawtooth voltage.
    Type: Grant
    Filed: September 29, 2005
    Date of Patent: April 13, 2010
    Inventors: Vinko Kunc, Maja Atanasijevic-Kunc, Andrej Vodopivec
  • Publication number: 20080284411
    Abstract: The measurement of a very low intensity of an electric current is carried out by integrating the electric current over integration cycles having a time period ti and measuring a peak value of a sawtooth voltage at an integrated circuit output each time at the end of the integration cycle, whereat noise voltage components of a frequency above a cut-off frequency, which has a value of the order of magnitude (0.1×2?×ti)?1, being parts of a voltage of a noise generated in an operational amplifier comprised in the integrated circuit are filtered out of the said sawtooth voltage and noise components, which have the origin in the high-frequency voltage components of Johnson noise, which appear in the low-frequency spectral part of the sawtooth voltage as aliasing, are subtracted from a filtered sawtooth voltage.
    Type: Application
    Filed: September 29, 2005
    Publication date: November 20, 2008
    Inventors: Vinko Kunc, Maja Atanasijevic-Kunc, Andrej Vodopivec