Patents by Inventor Apu Sivadas
Apu Sivadas 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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Publication number: 20090289721Abstract: An electronic circuit comprising a transistor-based RF (radio frequency) power amplifier (112) having balanced outputs (172, 176), a transistor-based receiver RF amplifier (116) having balanced inputs (152, 156) ohmically connected to said balanced outputs (172, 176) respectively of said RF power amplifier (112), and a balun (114) having a primary (182, 186) and a secondary (188), said primary (182, 186) having primary connections and a supply connection (185) of said primary (182, 186) intermediate said primary connections and said primary connections ohmically connected both to said balanced outputs (172, 176) of said RF power amplifier (112) respectively and to said balanced inputs (152, 156) of said receiver RF amplifier, thereby to switchlessly couple RF between the balun (114) and the RF power amplifier (112) and switchlessly couple RF between the balun (114) and the receiver RF amplifier (116). Other electronic circuits, processes, devices and systems are disclosed.Type: ApplicationFiled: May 5, 2009Publication date: November 26, 2009Applicant: Texas Instruments IncorporatedInventors: Gireesh Rajendran, Apu Sivadas, Subhashish Mukherjee
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Publication number: 20090201088Abstract: According to an aspect of the present invention, the magnitude and phase angle of looking-in impedance driven by an amplifier are computed in digital domain during normal operation within a module containing the amplifier. In an embodiment, the computed magnitude and phase angle are used for impedance matching at a node driven by the amplifier. As a result, impedance matching may be obtained even in situations when the impedance changes during operation.Type: ApplicationFiled: February 10, 2009Publication date: August 13, 2009Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Apu Sivadas, Gireesh Rajendran, Subhashish Mukherjee
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Patent number: 7415064Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: GrantFiled: July 22, 2005Date of Patent: August 19, 2008Assignee: Gennum CorporationInventors: Apu Sivadas, Atul Krishna Gupta, Kenneth Steven Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Kumar Shukla, Bharat Tailor
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Patent number: 7317757Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: GrantFiled: July 22, 2005Date of Patent: January 8, 2008Assignee: Gennum CorporationInventors: Apu Sivadas, Atul Krishna Gupta, Kenneth Steven Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Kumar Shukla, Bharat Tailor
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Patent number: 7180941Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: GrantFiled: July 22, 2005Date of Patent: February 20, 2007Assignee: Gennum CorporationInventors: Apu Sivadas, Atul Krishna Gupta, Kenneth Steven Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Kumar Shukla, Bharat Tailor
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Patent number: 7065134Abstract: An adaptive equalizer with a large data rate range is provided. The equalizer comprises an equalizer core, a slicer and an automatic gain control (AGC) loop. The equalizer core is coupled to an input signal from a transmission medium and applies a transfer function to the input signal to compensate for losses incurred in the transmission medium in order to generate a core output signal. The equalizer core is also coupled to a bandwidth control signal that controls a bandwidth of the transfer function. The slicer is coupled to the core output signal and converts the core output signal to a digital output signal having a fixed digital output swing that approximates a transmission swing of the input signal prior to transmission over the transmission medium. The AGC loop is coupled to the core output signal and the digital output signal and compares the core output signal with the digital output signal in order to generate the bandwidth control signal.Type: GrantFiled: August 27, 2001Date of Patent: June 20, 2006Assignee: Gennum CorporationInventors: Vasilis Papanikolaou, Apu Sivadas, Atul Gupta, Hossein Shakiba
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Publication number: 20050254566Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: ApplicationFiled: July 22, 2005Publication date: November 17, 2005Inventors: Apu Sivadas, Atul Gupta, Kenneth Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Shukla, Bharat Tailor
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Publication number: 20050254565Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: ApplicationFiled: July 22, 2005Publication date: November 17, 2005Inventors: Apu Sivadas, Atul Gupta, Kenneth Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Shukla, Bharat Tailor
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Publication number: 20050254567Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: ApplicationFiled: July 22, 2005Publication date: November 17, 2005Inventors: Apu Sivadas, Atul Gupta, Kenneth Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Shukla, Bharat Tailor
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Patent number: 6956914Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: GrantFiled: September 19, 2001Date of Patent: October 18, 2005Assignee: Gennum CorporationInventors: Apu Sivadas, Atul Krishna Gupta, Kenneth Steven Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Kumar Shukla, Bharat Tailor
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Publication number: 20030053534Abstract: Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment having an equalizer core, a controllable-swing slicer and an amplitude control loop, a second embodiment having an equalizer core, a fixed-swing slicer and a control loop, a third embodiment having an equalizer core, a variable gain amplifier, and a variable gain amplifier control loop, and a fourth embodiment having an equalizer core, a fixed-swing slicer, a variable gain amplifier, and a variable gain amplifier control loop.Type: ApplicationFiled: September 19, 2001Publication date: March 20, 2003Inventors: Apu Sivadas, Atul Krishna Gupta, Kenneth Steven Lazaris-Brunner, Vasilis Papanikolaou, Rajiv Kumar Shukla, Bharat Tailor
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Patent number: 6535087Abstract: An externally temperature-compensated microwave resonator comprises a microwave resonator and an external temperature compensator. The microwave resonator is a multi-cavity waveguide. The cavities are configured side-by-side and coupled through irises. The external temperature compensator is oriented and configured to effect a change in volume of the cavities when the resonator and compensator undergo a temperature gradient. The compensator deflects a wall portion of the resonator to accordingly counteract a change in volume of the cavity caused by a temperature gradient.Type: GrantFiled: August 29, 2000Date of Patent: March 18, 2003Assignee: COM DEV LimitedInventors: William Fitzpatrick, Ming Yu, David Smith, Apu Sivadas
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Publication number: 20030043897Abstract: An adaptive equalizer with a large data rate range is provided. The equalizer comprises an equalizer core, a slicer and an automatic gain control (AGC) loop. The equalizer core is coupled to an input signal from a transmission medium and applies a transfer function to the input signal to compensate for losses incurred in the transmission medium in order to generate a core output signal. The equalizer core is also coupled to a bandwidth control signal that controls a bandwidth of the transfer function. The slicer is coupled to the core output signal and converts the core output signal to a digital output signal having a fixed digital output swing that approximates a transmission swing of the input signal prior to transmission over the transmission medium. The AGC loop is coupled to the core output signal and the digital output signal and compares the core output signal with the digital output signal in order to generate the bandwidth control signal.Type: ApplicationFiled: August 27, 2001Publication date: March 6, 2003Inventors: Vasilis Papanikolaou, Apu Sivadas, Atul Gupta, Hossein Shakiba
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Patent number: 6459346Abstract: A microwave filter has a set of irises to couple cavities within the filter. A trifurcated iris comprises a central iris and a pair of peripheral irises. The peripheral irises are configured and oriented to couple a primary mode having a magnetic field in the axial direction of a filter cavity. The central iris is configured and oriented to couple a secondary mode having a magnetic field in the azimuthal direction of the filter cavity. The configuration of the trifurcated iris is further oriented to minimize the influence of higher order signals such as the TE21X mode. The peripheral iris are oriented at null points of the primary TE21X mode and the central iris is also located at a null point. An input and an output iris are configured to receive electromagnetic energy in the axial direction of the filter. The input and output irises are oriented to minimize signals in the TE21X secondary mode and any TM modes.Type: GrantFiled: August 29, 2000Date of Patent: October 1, 2002Assignee: COM DEV LimitedInventors: Apu Sivadas, Ming Yu, David Smith, William Fitzpatrick