Patents by Inventor Danilo Manstretta
Danilo Manstretta 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: 9490745Abstract: A voltage-controlled oscillator comprises a tank circuit and first and second pairs of transistors. Each transistor comprises a gate, a drain, and a source. The drains of the first pair are coupled to the tank circuit and the gates of the first pair are cross-coupled with the drains of the first pair. The drains of the second pair are coupled to the tank circuit and the gates of the second pair are cross-coupled with the drains of the second pair. The oscillator includes a first resonant filter comprising a first terminal coupled to the sources of the first pair and a second resonant filter comprising a first terminal coupled to the sources of the second pair. A method includes adjusting capacitance in a resonant filter to cause the resonant filter to resonate based on a selected frequency.Type: GrantFiled: January 21, 2015Date of Patent: November 8, 2016Assignee: Marvell International Ltd.Inventors: Stefano Dal Toso, Rinaldo Castello, Marco Garampazzi, Paulo Mateus Mendes, Nicola Codega, Danilo Manstretta
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Patent number: 8587381Abstract: An amplifier and a method are provided for converting a single ended signal to an amplified differential signal. The amplifier comprises an input configured to receive a single ended signal, a differential amplifier that outputs an amplified differential signal based on the single ended signal, and a compensator coupled to the differential amplifier and configured to inject an adjusted distortion compensating signal based on the even order distortion signal to compensate for a distortion in the amplified differential signal. The method comprises receiving a single ended signal, converting the single ended signal to an amplified differential signal, and generating a distortion compensating signal to substantially cancel an even order distortion signal injected to the differential signal by the converting.Type: GrantFiled: July 12, 2011Date of Patent: November 19, 2013Assignee: Marvell International Ltd.Inventors: Danilo Manstretta, Fernando DeBernardinis
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Patent number: 8149971Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: GrantFiled: August 17, 2011Date of Patent: April 3, 2012Assignee: Agere Systems Inc.Inventors: Joachim S. Hammerschmidt, Danilo Manstretta
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Publication number: 20110299618Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: ApplicationFiled: August 17, 2011Publication date: December 8, 2011Applicant: Agere Systems Inc.Inventors: Joachim S. Hammerschmidt, Danilo Manstretta
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Patent number: 8031808Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: GrantFiled: February 11, 2008Date of Patent: October 4, 2011Assignee: Agere Systems Inc.Inventors: Joachim S. Hammerschmidt, Danilo Manstretta
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Patent number: 7994865Abstract: An amplifier and a method for converting a single ended signal to an amplified differential signal. The amplifier comprises an input configured to receive a single ended signal, a differential amplifier that outputs an amplified differential signal based on the single ended signal, and a compensator coupled to the differential amplifier and configured to inject an adjusted distortion compensating signal based on the even order distortion signal to compensate for a distortion in the amplified differential signal. The method comprises receiving a single ended signal, converting the single ended signal to an amplified differential signal, and generating a distortion compensating signal to substantially cancel an even order distortion signal injected to the differential signal by the converting.Type: GrantFiled: June 27, 2008Date of Patent: August 9, 2011Assignee: Marvell International Ltd.Inventors: Danilo Manstretta, Fernando De Bernardinis
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Patent number: 7724085Abstract: The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.Type: GrantFiled: November 20, 2007Date of Patent: May 25, 2010Assignee: Broadcom CorporationInventor: Danilo Manstretta
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Patent number: 7509110Abstract: A mixer produces an improved output signal during frequency translation of an input signal using a local oscillator (LO) signal. The mixer includes five component mixers connected in parallel. Each component mixer uses a phase-shifted version of the LO signal for frequency translation to produce a component output signal from the input signal. The component output signals are scaled according to corresponding gain factors and combined to form the output signal. When the mixer is used in a receiver, the phases of the component LO signals and the gain factors are configured to substantially cancel overlapping baseband versions of component input signals located at the third, fifth, seventh and ninth harmonics of the LO frequency. When used in a transmitter, the same phase and gain factor configurations substantially cancel third, fifth, seventh and ninth harmonics within the output signal.Type: GrantFiled: October 31, 2005Date of Patent: March 24, 2009Assignee: Broadcom CorporationInventors: Takayuki Hayashi, Danilo Manstretta
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Patent number: 7504813Abstract: A power detector having temperature compensation for improved measurement performance includes a pair of rectifier transistors coupled to a differential input signal biased by a first temperature dependent current. An output of the pair of rectifier transistors provides a first component of a differential DC output signal. The first component of the differential DC output signal includes a DC voltage proportional to an amplitude of the differential input signal plus an offset voltage. The power detector further includes a reference transistor biased by a reference current. The reference current includes a second temperature dependent current and a temperature independent offset current for temperature compensation. An output of the reference transistor provides a second component of the differential DC output signal that includes a reference voltage.Type: GrantFiled: October 17, 2005Date of Patent: March 17, 2009Assignee: Broadcom CorporationInventor: Danilo Manstretta
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Publication number: 20080130773Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: ApplicationFiled: February 11, 2008Publication date: June 5, 2008Applicant: AGERE SYSTEMS INC.Inventors: Joachim S. Hammerschmidt, Danilo Manstretta
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Patent number: 7356322Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: GrantFiled: May 17, 2004Date of Patent: April 8, 2008Assignee: Agere Systems Inc.Inventors: Joachim S. Hammerschmidt, Danilo Manstretta
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Publication number: 20080068076Abstract: The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.Type: ApplicationFiled: November 20, 2007Publication date: March 20, 2008Applicant: Broadcom CorporationInventor: Danilo Manstretta
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Patent number: 7301394Abstract: The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.Type: GrantFiled: December 7, 2005Date of Patent: November 27, 2007Assignee: Broadcom CorporationInventor: Danilo Manstretta
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Publication number: 20060205370Abstract: A mixer produces an improved output signal during frequency translation of an input signal using a local oscillator (LO) signal. The mixer includes five component mixers connected in parallel. Each component mixer uses a phase-shifted version of the LO signal for frequency translation to produce a component output signal from the input signal. The component output signals are scaled according to corresponding gain factors and combined to form the output signal. When the mixer is used in a receiver, the phases of the component LO signals and the gain factors are configured to substantially cancel overlapping baseband versions of component input signals located at the third, fifth, seventh and ninth harmonics of the LO frequency. When used in a transmitter, the same phase and gain factor configurations substantially cancel third, fifth, seventh and ninth harmonics within the output signal.Type: ApplicationFiled: October 31, 2005Publication date: September 14, 2006Applicant: Broadcom CorporationInventors: Takayuki Hayashi, Danilo Manstretta
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Publication number: 20060125557Abstract: The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.Type: ApplicationFiled: December 7, 2005Publication date: June 15, 2006Applicant: Broadcom CorporationInventor: Danilo Manstretta
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Publication number: 20060125453Abstract: A power detector having temperature compensation for improved measurement performance includes a pair of rectifier transistors coupled to a differential input signal biased by a first temperature dependent current. An output of the pair of rectifier transistors provides a first component of a differential DC output signal. The first component of the differential DC output signal includes a DC voltage proportional to an amplitude of the differential input signal plus an offset voltage. The power detector further includes a reference transistor biased by a reference current. The reference current includes a second temperature dependent current and a temperature independent offset current for temperature compensation. An output of the reference transistor provides a second component of the differential DC output signal that includes a reference voltage.Type: ApplicationFiled: October 17, 2005Publication date: June 15, 2006Applicant: Broadcom CorporationInventor: Danilo Manstretta
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Publication number: 20050255815Abstract: A wireless receiver detects signals received at two or more antennas, with each antenna coupled to an input receive chain. A switch is employed to couple selected input receive chains to one or more corresponding output receive chains during listening, coarse-detection, and fine-adjustment modes. At least one channel selection filter (CSF) is employed in each output receive chain, and the receiver employs sub-ranging. During idle mode, one antenna's input receive chain is connected to two or more CSFs to detect the packet. When the packet is detected, during a coarse-adjustment mode, the CSFs are reconfigured to couple each antenna's input receive chain to a corresponding output receive chain using low-gain signals. During fine-adjustment mode, the various gains are adjusted to be either high- or low-gain to maintain signals within the dynamic range of the corresponding CSFs.Type: ApplicationFiled: May 17, 2004Publication date: November 17, 2005Inventors: Joachim Hammerschmidt, Danilo Manstretta