Patents by Inventor Thomas Lejon
Thomas Lejon 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: 10284413Abstract: According to some embodiments, an apparatus for generating multiple variable frequency and phase locked clock signals comprises complex tuners, digital up-samplers, image isolation filters, quadrature modulators, a combiner, a DAC, a local oscillator, and an analog filter. The complex tuners tune multiple digital baseband signals. The up-samplers interpolate the complex tuned digital signals such that one of the up-sampled images of each of the complex tuned digital signals corresponds to a desired frequency. The image isolation filters isolate images corresponding to the desired frequencies. The quadrature modulators convert the isolated images of the complex tuned digital signals into real digital signals. The combiner combines the real digital signals into a combined real digital signal. The DAC, driven by the local oscillator, converts the combined real digital signal into an analog clock signal. The analog filter then filters the analog clock signal to select images located at the desired frequencies.Type: GrantFiled: January 3, 2018Date of Patent: May 7, 2019Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Bradley John Morris, Arthur T. G. Fuller, Bengt Thomas Lejon
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Publication number: 20180131555Abstract: According to some embodiments, an apparatus for generating multiple variable frequency and phase locked clock signals comprises complex tuners, digital up-samplers, image isolation filters, quadrature modulators, a combiner, a DAC, a local oscillator, and an analog filter. The complex tuners tune multiple digital baseband signals. The up-samplers interpolate the complex tuned digital signals such that one of the up-sampled images of each of the complex tuned digital signals corresponds to a desired frequency. The image isolation filters isolate images corresponding to the desired frequencies. The quadrature modulators convert the isolated images of the complex tuned digital signals into real digital signals. The combiner combines the real digital signals into a combined real digital signal. The DAC, driven by the local oscillator, converts the combined real digital signal into an analog clock signal. The analog filter then filters the analog clock signal to select images located at the desired frequencies.Type: ApplicationFiled: January 3, 2018Publication date: May 10, 2018Inventors: Bradley John MORRIS, Arthur T.G. FULLER, Bengt Thomas LEJON
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Patent number: 9929892Abstract: According to some embodiments, an apparatus for generating multiple variable frequency and phase locked clock signals comprises complex tuners, digital up-samplers, image isolation filters, quadrature modulators, a combiner, a DAC, a local oscillator, and an analog filter. The complex tuners tune multiple digital baseband signals. The up-samplers interpolate the complex tuned digital signals such that one of the up-sampled images of each of the complex tuned digital signals corresponds to a desired frequency. The image isolation filters isolate images corresponding to the desired frequencies. The quadrature modulators convert the isolated images of the complex tuned digital signals into real digital signals. The combiner combines the real digital signals into a combined real digital signal. The DAC, driven by the local oscillator, converts the combined real digital signal into an analog clock signal. The analog filter then filters the analog clock signal to select images located at the desired frequencies.Type: GrantFiled: May 1, 2014Date of Patent: March 27, 2018Assignee: Telefonaktiebolaget LM Ericsson (Publ)Inventors: Bradley John Morris, Arthur T. G. Fuller, Bengt Thomas Lejon
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Publication number: 20170063592Abstract: According to some embodiments, an apparatus for generating multiple variable frequency and phase locked clock signals comprises complex tuners, digital up-samplers, image isolation filters, quadrature modulators, a combiner, a DAC, a local oscillator, and an analog filter. The complex tuners tune multiple digital baseband signals. The up-samplers interpolate the complex tuned digital signals such that one of the up-sampled images of each of the complex tuned digital signals corresponds to a desired frequency. The image isolation filters isolate images corresponding to the desired frequencies. The quadrature modulators convert the isolated images of the complex tuned digital signals into real digital signals. The combiner combines the real digital signals into a combined real digital signal. The DAC, driven by the local oscillator, converts the combined real digital signal into an analog clock signal. The analog filter then filters the analog clock signal to select images located at the desired frequencies.Type: ApplicationFiled: May 1, 2014Publication date: March 2, 2017Inventors: Bradley John MORRIS, Arthur T.G. FULLER, Bengt Thomas LEJON
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Patent number: 8659354Abstract: A power-amplifier arrangement (35) is disclosed. The power-amplifier arrangement (35) comprises a pulse modulator (40) adapted to receive a digital input signal of the power-amplifier arrangement (35) and generate, based on the digital input signal of the power-amplifier arrangement (35), an output signal of the pulse modulator (40) with a plurality of quantization levels. The pulse modulator has a plurality of output ports (50—1-50_n) for representing the output signal of the pulse modulator (40). Each output port (50—1-50_n) of the pulse modulator (40) is associated with a unique one of the quantization levels such that a signal output on the output port (50—1-50_n) adopts a first state when the output signal of the pulse modulator (40) equals or exceeds the associated quantization level, or, otherwise, a second state. A related radio-transmitter circuit and a related radio-communication apparatus are also disclosed.Type: GrantFiled: April 14, 2010Date of Patent: February 25, 2014Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Ulf Gustavsson, Thomas Lejon, Johan Thorebäck
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Publication number: 20130021095Abstract: A power-amplifier arrangement (35) is disclosed. The power-amplifier arrangement (35) comprises a pulse modulator (40) adapted to receive a digital input signal of the power-amplifier arrangement (35) and generate, based on the digital input signal of the power-amplifier arrangement (35), an output signal of the pulse modulator (40) with a plurality of quantization levels. The pulse modulator has a plurality of output ports (50—1-50—n) for representing the output signal of the pulse modulator (40). Each output port (50—1-50—n) of the pulse modulator (40) is associated with a unique one of the quantization levels such that a signal output on the output port (50—1-50—n) adopts a first state when the output signal of the pulse modulator (40) equals or exceeds the associated quantization level, or, otherwise, a second state. The power-amplifier arrangement further comprises an amplifier section (55) comprising a plurality of amplifiers (60—1-60—n).Type: ApplicationFiled: April 14, 2010Publication date: January 24, 2013Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Ulf Gustavsson, Thomas Lejon, Johan Thorebäck
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Patent number: 8040185Abstract: The present invention concerns an amplifying device arranged to receive an input signal having a certain duty cycle. The amplifying device comprise a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output terminal adapted to be connected to a first signal output where a first half of an output signal is provided. The amplifying device comprise a second switching unit having an input terminal adapted to receive a second half of the input signal and an output terminal adapted to be connected to a second signal output where a second half of the output signal is provided. Also, the first switching unit and the second switching units are adapted to receive an input signal, wherein the first half of said input signal has the same duty cycle as the second half of the input signal but shifted in phase. The present invention also concerns a wireless transceiver and a radio transmission device.Type: GrantFiled: July 5, 2007Date of Patent: October 18, 2011Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventor: Thomas Lejon
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Patent number: 8022759Abstract: The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (100) capable of operating in at least three differential amplification modes. The drive signal's amplitude envelope controls an integrated switch network (104; 105, 106) that routes both the signal envelope and signal phase to different modulation blocks (111, 112: 109, 110: 115). Depending on the envelope strength, the operational mode of the amplifier system is possible to alter to best serve the signal statistics to provide the highest overall power efficiency.Type: GrantFiled: November 1, 2006Date of Patent: September 20, 2011Assignee: Telefonaktiebolaget L M Ericsson (publ)Inventors: Thomas Lejon, Leonard Rexberg
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Publication number: 20110148518Abstract: The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (100) capable of operating in at least three differential amplification modes. The drive signal's amplitude envelope controls an integrated switch network (104; 105, 106) that routes both the signal envelope and signal phase to different modulation blocks (111, 112: 109, 110: 115). Depending on the envelope strength, the operational mode of the amplifier system is possible to alter to best serve the signal statistics to provide the highest overall power efficiency.Type: ApplicationFiled: November 1, 2006Publication date: June 23, 2011Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventors: Thomas Lejon, Leonard Rexberg
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Patent number: 7956683Abstract: The present invention addresses the problem to extend the dynamic power range where the amplifier operates linearly for a full input amplitude swing with improved efficiency. According to the present invention, the above presented problem is solved by changing the delivered power to the load by changing the value of the load and still keeping the amplifier in its linear condition. The invention enables the amplifier to maintain high efficiency over a wider power range.Type: GrantFiled: June 9, 2006Date of Patent: June 7, 2011Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventor: Thomas Lejon
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Patent number: 7932790Abstract: Switch-modulation of a radio-frequency power amplifier by-representing the input signal by the I-signal (1) and Q-signal (9) of the complex components (I+j?Q), and pulse width modulating the I-signal and the Q-signal separately to create a modulated I-signal pulse sequence (3a) and a modulated Q-signal pulse sequence (3b). Further, the pulses corresponding to negative sample values are time-shifted relative the pulses corresponding to positive sample values, and each pulse of the I-signal pulse sequence is delayed by introducing a delaying time shift.Type: GrantFiled: October 27, 2006Date of Patent: April 26, 2011Assignee: Telefonaktiebolaget LM Ericsson (publ)Inventors: Leonard Rexberg, Håkan Malmqvist, Thomas Lejon
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Patent number: 7902921Abstract: The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.Type: GrantFiled: August 17, 2010Date of Patent: March 8, 2011Assignee: Telefonaktiebolaget L M Ericsson (PUBL)Inventor: Thomas Lejon
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Publication number: 20100301933Abstract: The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.Type: ApplicationFiled: August 17, 2010Publication date: December 2, 2010Inventor: Thomas Lejon
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Publication number: 20100237938Abstract: The present invention addresses the problem to extend the dynamic power range where the amplifier operates linearly for a full input amplitude swing with improved efficiency. According to the present invention, the above presented problem is solved by changing the delivered power to the load by changing the value of the load and still keeping the amplifier in its linear condition. The invention enables the amplifier to maintain high efficiency over a wider power range.Type: ApplicationFiled: June 9, 2006Publication date: September 23, 2010Applicant: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)Inventor: Thomas Lejon
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Patent number: 7800442Abstract: The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.Type: GrantFiled: April 21, 2006Date of Patent: September 21, 2010Assignee: Telefonaktiebolaget L M Ericsson (Publ)Inventor: Thomas Lejon
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Publication number: 20100194480Abstract: The present invention concerns an amplifying device arranged to receive an input signal having a certain duty cycle. The amplifying device comprise a first switching unit having an input terminal adapted to receive a first half of the input signal, and an output terminal adapted to be connected to a first signal output where a first half of an output signal is provided. The amplifying device comprise a second switching unit having an input terminal adapted to receive a second half of the input signal and an output terminal adapted to be connected to a second signal output where a second half of the output signal is provided. Also, the first switching unit and the second switching units are adapted to receive an input signal, wherein the first half of said input signal has the same duty cycle as the second half of the input signal but shifted in phase. The present invention also concerns a wireless transceiver and a radio transmission device.Type: ApplicationFiled: July 5, 2007Publication date: August 5, 2010Applicant: Telefonaktiebolaget L M Ericsson (publ)Inventor: Thomas Lejon
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Publication number: 20100097153Abstract: Switch-modulation of a radio-frequency power amplifier by-representing the input signal by the I-signal (1) and Q-signal (9) of the complex components (I+j?Q), and pulse width modulating the I-signal and the Q-signal separately to create a modulated I-signal pulse sequence (3a) and a modulated Q-signal pulse sequence (3b). Further, the pulses corresponding to negative sample values are time-shifted relative the pulses corresponding to positive sample values, and each pulse of the I-signal pulse sequence is delayed by introducing a delaying time shift.Type: ApplicationFiled: October 27, 2006Publication date: April 22, 2010Inventors: Leonard Rexberg, Håkan Malmqvist, Thomas Lejon
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Publication number: 20090102554Abstract: The present invention relates to balanced power amplifier network in combination with outphasing techniques such as Chireix. The object of the present invention is to provide a solution to the problem to combine balanced amplifiers like the current mode class D (CMCD) or class E/F with a LINC network. The main problem is that some power amplifiers have balanced output and the LINC network is single-ended so that a high power low loss transformer that works at several impedance levels is needed, which is hard to realize at cellular frequencies.Type: ApplicationFiled: April 21, 2006Publication date: April 23, 2009Inventor: Thomas Lejon
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Publication number: 20070259631Abstract: By the present invention is provided an inventive radio transmitter and a method to operate a radio transmitter, by which the quality of a transmitted radio signal can be improved. The radio transmitter comprises at least one digital filter having adjustable parameters. Via a control signal input the transmitter can receive a feedback signal being indicative of the output signal from the transmitter. The radio transmitter comprises programmable digital circuitry adapted to analyzing the feedback signal and to generating an analysis result. The programmable digital circuitry is further adapted to adjusting the adjustable parameters of the digital filter in accordance with the analysis result.Type: ApplicationFiled: June 21, 2005Publication date: November 8, 2007Applicant: ANDREW CORPORATIONInventors: Kenneth Ljung, Staffan Nystrom, Thomas Lejon