Patents by Inventor Igor Acimovic
Igor Acimovic 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).
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Patent number: 9286429Abstract: At least one example embodiment discloses a method of generating parameters of an amplifier. The method includes displaying, by a processor, a graphical user interface on a display, the graphical user interface associated with input and output parameters of the amplifier, receiving input parameter values for the amplifier, generating output parameter values for the amplifier based on the obtained input parameter values and displaying the generated output values on the display.Type: GrantFiled: December 31, 2013Date of Patent: March 15, 2016Assignee: Alcatel LucentInventors: Brian Racey, Igor Acimovic
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Publication number: 20150186580Abstract: At least one example embodiment discloses a method of generating parameters of an amplifier. The method includes displaying, by a processor, a graphical user interface on a display, the graphical user interface associated with input and output parameters of the amplifier, receiving input parameter values for the amplifier, generating output parameter values for the amplifier based on the obtained input parameter values and displaying the generated output values on the display.Type: ApplicationFiled: December 31, 2013Publication date: July 2, 2015Applicant: ALCATEL-LUCENT CANADA INC.Inventors: Brian RACEY, Igor ACIMOVIC
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Patent number: 9071202Abstract: In one embodiment, a Doherty amplifier having a main amplifier branch and one or more peak amplifier branches, where at least one peak amplifier branch has RF conditioning applied to its peak branch input signal such that the peak amplifier branch is active only when the peak branch input signal is greater than a specified threshold level. In one implementation, a reverse-biased diode is configured between the peak branch input signal and a peak amplifier device, where the bias signal applied to the diode establishes the specified threshold level. Depending on the implementation, the bias signal may be static or dynamic, and multiple peak amplifier branches may have diodes with independently or dependently generated bias signals applied.Type: GrantFiled: October 18, 2013Date of Patent: June 30, 2015Assignee: Alcatel LucentInventors: Brian Racey, Igor Acimovic
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Publication number: 20150109058Abstract: In one embodiment, a Doherty amplifier having a main amplifier branch and one or more peak amplifier branches, where at least one peak amplifier branch has RF conditioning applied to its peak branch input signal such that the peak amplifier branch is active only when the peak branch input signal is greater than a specified threshold level. In one implementation, a reverse-biased diode is configured between the peak branch input signal and a peak amplifier device, where the bias signal applied to the diode establishes the specified threshold level. Depending on the implementation, the bias signal may be static or dynamic, and multiple peak amplifier branches may have diodes with independently or dependently generated bias signals applied.Type: ApplicationFiled: October 18, 2013Publication date: April 23, 2015Applicant: ALCATEL-LUCENT CANADA INC.Inventors: Brian Racey, Igor Acimovic
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Patent number: 8975955Abstract: An analysis technique for (Doherty) amplifiers having a main amplifier branch and at least one peak amplifier branch. For a given input power level and assumed amplifier impedance levels, an output power level and phase response are obtained for each active device using appropriate load-pull data based on the impedance levels. The performance of the amplifier is analyzed based on the impedance levels, output power levels, and phase responses to generate updated impedance levels. The analysis is repeated until the updated impedance levels converge on steady state values. The analysis can be repeated for different input power levels. Main and peak output matching networks for the amplifier can be designed by iteratively adjusting impedance levels for the networks using appropriate load-pull contours. For the design and analysis phases, the load-pull contours include Class-AB data for the main amplifier device and Class-C data for the peak amplifier device.Type: GrantFiled: December 11, 2012Date of Patent: March 10, 2015Assignee: Alcatel LucentInventors: Igor Acimovic, Brian Racey
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Patent number: 8798561Abstract: An RF circuit having a transcoupler, a multifunctional RF-circuit element that can operate both as an impedance inverter and as a signal coupler. When connected to a fixed load impedance, the transcoupler can also operate as an impedance transformer. The impedance-transformer/inverter functionality of the transcoupler can be used, e.g., to modulate the load of a power amplifier. The signal coupler functionality of the transcoupler can be used, e.g., to generate a corresponding feedback signal indicative of phase and/or amplitude distortions in the amplifier. The use of various embodiments of the transcoupler in an RF circuit can be advantageous, for example, because the transcoupler has a lower insertion loss than a cascade consisting of a prior-art impedance inverter and a prior-art directional coupler, occupies a relatively small area on the printed circuit board, and helps to reduce the per-unit fabrication and operating costs.Type: GrantFiled: September 8, 2011Date of Patent: August 5, 2014Assignee: Alcatel LucentInventor: Igor Acimovic
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Publication number: 20140159808Abstract: An analysis technique for (Doherty) amplifiers having a main amplifier branch and at least one peak amplifier branch. For a given input power level and assumed amplifier impedance levels, an output power level and phase response are obtained for each active device using appropriate load-pull data based on the impedance levels. The performance of the amplifier is analyzed based on the impedance levels, output power levels, and phase responses to generate updated impedance levels. The analysis is repeated until the updated impedance levels converge on steady state values. The analysis can be repeated for different input power levels. Main and peak output matching networks for the amplifier can be designed by iteratively adjusting impedance levels for the networks using appropriate load-pull contours. For the design and analysis phases, the load-pull contours include Class-AB data for the main amplifier device and Class-C data for the peak amplifier device.Type: ApplicationFiled: December 11, 2012Publication date: June 12, 2014Applicant: Alcatel-Lucent Canada Inc.Inventors: Igor Acimovic, Brian Racey
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Publication number: 20140062601Abstract: A Doherty amplifier having a main amplifier branch and one or more peak amplifier branches, where the functionality and structure of the cascade of the main output matching network, the main offset line, and the quarter-wave transformer of the main amplifier branch of a conventional Doherty amplifier are subsumed into the main output matching network of the main amplifier branch, and the functionality and structure of each cascade of the peak output matching network and the peak offset line of each peak amplifier branch of a conventional Doherty amplifier are subsumed into the peak output matching network of the corresponding peak amplifier branch. Furthermore, the output quarter-wave transformer can be replaced by a wideband node matching network that does not have to perform frequency inversion.Type: ApplicationFiled: September 6, 2012Publication date: March 6, 2014Applicant: ALCATEL-LUCENT CANADA INC.Inventors: Igor Acimovic, Brian Racey
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Patent number: 8649744Abstract: A transmitter that uses a digital pre-distortion (DPD) circuit to mitigate the effects of nonlinearity of a multistage or multi-branch power amplifier. The DPD circuit relies on two or more feedback signals received from an RF-output circuit of the transmitter to generate individually pre-distorted signals for the individual stages/branches of the power amplifier. The use of these individually pre-distorted signals advantageously enables the transmitter to achieve a more efficient suppression of inter-modulation-distortion products than that typically achieved with a comparable prior-art transmitter.Type: GrantFiled: September 8, 2011Date of Patent: February 11, 2014Assignee: Alcatel LucentInventor: Igor Acimovic
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Publication number: 20130063208Abstract: A transmitter that uses a digital pre-distortion (DPD) circuit to mitigate the effects of nonlinearity of a multistage or multi-branch power amplifier. The DPD circuit relies on two or more feedback signals received from an RF-output circuit of the transmitter to generate individually pre-distorted signals for the individual stages/branches of the power amplifier. The use of these individually pre-distorted signals advantageously enables the transmitter to achieve a more efficient suppression of inter-modulation-distortion products than that typically achieved with a comparable prior-art transmitter.Type: ApplicationFiled: September 8, 2011Publication date: March 14, 2013Applicant: ALCATEL-LUCENT CANADA INC.Inventor: Igor Acimovic
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Publication number: 20130063222Abstract: An RF circuit having a transcoupler, a multifunctional RF-circuit element that can operate both as an impedance inverter and as a signal coupler. When connected to a fixed load impedance, the transcoupler can also operate as an impedance transformer. The impedance-transformer/inverter functionality of the transcoupler can be used, e.g., to modulate the load of a power amplifier. The signal coupler functionality of the transcoupler can be used, e.g., to generate a corresponding feedback signal indicative of phase and/or amplitude distortions in the amplifier. The use of various embodiments of the transcoupler in an RF circuit can be advantageous, for example, because the transcoupler has a lower insertion loss than a cascade consisting of a prior-art impedance inverter and a prior-art directional coupler, occupies a relatively small area on the printed circuit board, and helps to reduce the per-unit fabrication and operating costs.Type: ApplicationFiled: September 8, 2011Publication date: March 14, 2013Applicant: ALCATEL-LUCENT CANADA INC.Inventor: Igor Acimovic
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Patent number: 8314654Abstract: The present invention relates to a Multi-Band Doherty amplifier. Embodiments of the present invention provide an amplifying structure including a main amplifier configured to amplify a first signal, a peak amplifier configured to amplify a second signal, a tunable impedance inverter configured to perform impedance inversion to modulate a load impedance of the main amplifier, and a combining node configured to receive the amplified second signal from the peak amplifier and an output of the tunable impedance inverter. The tunable impedance inverter includes a tuner configured to tune the impedance inversion over at least one broad frequency band. The tuner is (i) at least one capacitor, (i) at least one varactor, or (ii) at least one open stub shunted by a diode.Type: GrantFiled: May 17, 2010Date of Patent: November 20, 2012Assignee: Alcatel LucentInventors: Noureddine Outaleb, Igor Acimovic
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Publication number: 20110279178Abstract: The present invention relates to a Multi-Band Doherty amplifier. Embodiments of the present invention provide an amplifying structure including a main amplifier configured to amplify a first signal, a peak amplifier configured to amplify a second signal, a tunable impedance inverter configured to perform impedance inversion to modulate a load impedance of the main amplifier, and a combining node configured to receive the amplified second signal from the peak amplifier and an output of the tunable impedance inverter. The tunable impedance inverter includes a tuner configured to tune the impedance inversion over at least one broad frequency band. The tuner is (i) at least one capacitor, (i) at least one varactor, or (ii) at least one open stub shunted by a diode.Type: ApplicationFiled: May 17, 2010Publication date: November 17, 2011Inventors: Noureddine Outaleb, Igor Acimovic