Patents by Inventor Christophe Chanlo
Christophe Chanlo 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: 8330475Abstract: The invention relates to an antenna which is coupled to an RF amplifier. Environmental conditions change the impedance of the antenna, which reduces output power, efficiency and linearity. A circuit is provided which is designed to detect the impedance of the antenna. With the measured impedance, impedance matching can be accomplished. The circuit for detecting the impedance detects the signal travelling from the RF amplifier to the antenna, and measures the peak voltage and the peak current of this signal. Furthermore, the phase difference between the voltage and the current is measured. The advantage of the circuit is its compactness allowing for an easy integration on a chip. Furthermore, an impedance matching circuit is suggested which makes use of the above circuit for detecting the impedance.Type: GrantFiled: September 29, 2005Date of Patent: December 11, 2012Assignee: EPCOS AGInventors: Adrianus Van Bezooijen, Christophe Chanlo
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Patent number: 7821273Abstract: The invention refers to a circuit and a method for detecting the impedance of a load, whereby the circuit and the method can be used by an impedance matching circuit. Impedance matching circuits need a complex algorithm to adjust the impedance accordingly. This algorithm renders the response time to be long. It has been found out that the complexity partially stems from the fact that the phase of the reflection coefficient is not known over the full range of 0° to 360°. A quadrature phase detector is used to provide the full phase information.Type: GrantFiled: September 9, 2005Date of Patent: October 26, 2010Assignee: Epcos AGInventors: Adrianus Van Bezooijen, Christophe Chanlo
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Publication number: 20090289719Abstract: A method and circuit for preserving linearity of a RF power amplifier, the power amplifier including a RF power output unit having a characteristic drive level and fed by a supply voltage, comprising measuring the output voltage of the RF power output unit; comparing the measured output voltage to at least one threshold voltage to produce a control signal; and adapting the drive level or the supply voltage of the RF power output unit by means of the control signal to operate the output unit below its saturation level. A method and circuit for stabilizing an antenna circuit comprising a RF power amplifier and a matching circuit by preserving linearity of a RF power amplifier, where the above power amplifier is used.Type: ApplicationFiled: November 14, 2008Publication date: November 26, 2009Inventors: Adrianus Van Bezooijen, Christophe Chanlo
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Patent number: 7482873Abstract: A method and circuit for preserving linearity of a RF power amplifier, the power amplifier including a RF power output unit (4, 24, 62) having a characteristic drive level and fed by a supply voltage, comprising measuring the output voltage of the RF power output unit (4, 24, 62); comparing the measured output voltage to at least one threshold voltage to produce a control signal; and adapting the drive level or the supply voltage of the RF power output (4, 24, 62) unit by means of the control signal to operate the output unit below its saturation level. A method and circuit for stabilizing an antenna circuit comprising a RF power amplifier and a matching circuit by preserving linearity of a RF power amplifier, where the above power amplifier is used.Type: GrantFiled: August 4, 2003Date of Patent: January 27, 2009Assignee: NXP B.V.Inventors: Adrianus Van Bezooijen, Christophe Chanlo
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Publication number: 20080266021Abstract: The invention relates to an antenna which is coupled to an RF amplifier. Environmental conditions change the impedance of the antenna, which reduces output power, efficiency and linearity. A circuit is provided which is designed to detect the impedance of the antenna. With the measured impedance, impedance matching can be accomplished. The circuit for detecting the impedance detects the signal travelling from the RF amplifier to the antenna, and measures the peak voltage and the peak current of this signal. Furthermore, the phase difference between the voltage and the current is measured. The advantage of the circuit is its compactness allowing for an easy integration on a chip. Furthermore, an impedance matching circuit is suggested which makes use of the above circuit for detecting the impedance.Type: ApplicationFiled: September 29, 2005Publication date: October 30, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Adrianus Van Bezooijen, Christophe Chanlo
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Publication number: 20080186032Abstract: The invention refers to a circuit and a method for detecting the impedance of a load, whereby the circuit and the method can be used by an impedance matching circuit. Impedance matching circuits need a complex algorithm to adjust the impedance accordingly. This algorithm renders the response time to be long. It has been found out that the complexity partially stems from the fact that the phase of the reflection coefficient is not known over the full range of 0° to 360°. A quadrature phase detector is used to provide the full phase information.Type: ApplicationFiled: September 9, 2005Publication date: August 7, 2008Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Adrianus Van Bezooijen, Christophe Chanlo
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Patent number: 7274206Abstract: A detection circuit for detecting the output power of a power amplifier comprises a first current minor transistor (Ti 1) having a base, which is connectable to a power transistor (T10), and a collector, a RF detection means (RF-det) for detecting the RF current flowing through the current mirror transistor (T11). Said RF detection means (RFdet) is connected to the collector of said first current mirror transistor (T11). Said detection circuit further comprises a biasing means (bias-RF-det) for biasing said RF detection means (RF-det), wherein said biasing means is connected to said collector of said first current mirror (T11) and said RF detection means (RF-det).Type: GrantFiled: June 15, 2004Date of Patent: September 25, 2007Assignee: NXP B.V.Inventors: Dmitry Pavlovich Prikhodko, Adrianus Van Bezooijen, Christophe Chanlo, John Joseph Hug, Ronald Koster
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Publication number: 20060186964Abstract: A detection circuit for detecting the output power of a power amplifier comprises a first current minor transistor (Ti 1) having a base, which is connectable to a power transistor (T10), and a collector, a RF detection means (RF-det) for detecting the RF current flowing through the current mirror transistor (T11). Said RF detection means (RFdet) is connected to the collector of said first current mirror transistor (T11). Said detection circuit further comprises a biasing means (bias-RF-det) for biasing said RF detection means (RF-det), wherein said biasing means is connected to said collector of said first current mirror (T11) and said RF detection means (RF-det).Type: ApplicationFiled: June 15, 2004Publication date: August 24, 2006Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventors: Dmitry Prikhodko, Adrianus Van Bezooijen, Christophe Chanlo, John Hug, Ronald Koster
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Publication number: 20050270105Abstract: A method and circuit for preserving linearity of a RF power amplifier, the power amplifier including a RF power output unit (4, 24, 62) having a characteristic drive level and fed by a supply voltage, comprising measuring the output voltage of the RF power output unit (4, 24, 62); comparing the measured output voltage to at least one threshold voltage to produce a control signal; and adapting the drive level or the supply voltage of the RF power output (4, 24, 62) unit by means of the control signal to operate the output unit below its saturation level. A method and circuit for stabilizing an antenna circuit comprising a RF power amplifier and a matching circuit by preserving linearity of a RF power amplifier, where the above power amplifier is used.Type: ApplicationFiled: August 4, 2003Publication date: December 8, 2005Applicant: Koninklijke Philips Electronics N.V.Inventors: Adrianus Van Bezooijen, Christophe Chanlo