Patents by Inventor Pradeep Silva
Pradeep Silva 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: 11683015Abstract: A class-D amplifier including a pulse width modulator including an input configured to receive a first signal based on an input signal, and an output configured to generate a pulse width modulated (PWM) signal; an H-bridge including an input coupled to an output of the pulse width modulator and an output coupled to a load, wherein the H-bridge is configured to generate an output signal across the load based on the PWM signal; and a deadtime compensation circuit coupled to the H-bridge, wherein the deadtime compensation circuit is configured to compensate for deadtime distortion in the output signal. The deadtime compensation circuit may be a feedback circuit between an output of the H-bridge and an input of the pulse width modulator, a pulse modification circuit at the output of the pulse width modulator, or an offset signal generating circuit providing an offset signal to the pulse width modulator.Type: GrantFiled: August 17, 2021Date of Patent: June 20, 2023Assignee: QUALCOMM IncorporatedInventors: ChienChung Yang, Dongyang Tang, Sherif Galal, Xinwang Zhang, Subbarao Surendra Chakkirala, Pradeep Silva
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Publication number: 20230058434Abstract: A class-D amplifier including a pulse width modulator including an input configured to receive a first signal based on an input signal, and an output configured to generate a pulse width modulated (PWM) signal; an H-bridge including an input coupled to an output of the pulse width modulator and an output coupled to a load, wherein the H-bridge is configured to generate an output signal across the load based on the PWM signal; and a deadtime compensation circuit coupled to the H-bridge, wherein the deadtime compensation circuit is configured to compensate for deadtime distortion in the output signal. The deadtime compensation circuit may be a feedback circuit between an output of the H-bridge and an input of the pulse width modulator, a pulse modification circuit at the output of the pulse width modulator, or an offset signal generating circuit providing an offset signal to the pulse width modulator.Type: ApplicationFiled: August 17, 2021Publication date: February 23, 2023Inventors: ChienChung YANG, Dongyang TANG, Sherif GALAL, Xinwang ZHANG, Subbarao Surendra CHAKKIRALA, Pradeep SILVA
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Patent number: 11424720Abstract: A power amplifier provides reduction of click and pop in audio applications. The power amplifier includes a first amplifier and an auxiliary amplifier. The auxiliary amplifier is used to ramp the power amplifier output from ground to an offset voltage to reduce the “click and pop” sound. The first amplifier and the auxiliary amplifier having a shared feedback loop. An output of the first amplifier and an output of the auxiliary amplifier may be switchably coupled to the shared feedback loop. A wave generator controls a switch to couple the first amplifier output or the auxiliary amplifier output to the shared feedback loop.Type: GrantFiled: March 23, 2020Date of Patent: August 23, 2022Assignee: QUALCOMM IncorporatedInventors: Pradeep Silva, Ramkumar Sivakumar, Qubo Zhou, Xinwang Zhang, Hanil Lee, Dongyang Tang, Vijayakumar Dhanasekaran
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Patent number: 11424672Abstract: Certain aspects of the present disclosure provide a power supply circuit. The power supply circuit generally includes: a switched-mode power supply (SMPS) having an inductive element and a first switch coupled to the inductive element; a feedback path coupled between an output of the SMPS and a control input of the first switch; and a current limit circuit comprising a first capacitive element, a charge circuit coupled to the first capacitive element, a first current source, a first resistive element coupled to the first current source, the capacitive element being coupled to a node between the resistive element and the first current source, a sample-and-hold circuit coupled to the first capacitive element, and a clamp circuit coupled between the sample-and-hold circuit and the feedback path.Type: GrantFiled: January 26, 2021Date of Patent: August 23, 2022Assignee: QUALCOMM IncorporatedInventors: Pradeep Silva, Subbarao Surendra Chakkirala, Sherif Galal
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Publication number: 20210297046Abstract: A power amplifier provides reduction of click and pop in audio applications. The power amplifier includes a first amplifier and an auxiliary amplifier. The auxiliary amplifier is used to ramp the power amplifier output from ground to an offset voltage to reduce the “click and pop” sound. The first amplifier and the auxiliary amplifier having a shared feedback loop. An output of the first amplifier and an output of the auxiliary amplifier may be switchably coupled to the shared feedback loop. A wave generator controls a switch to couple the first amplifier output or the auxiliary amplifier output to the shared feedback loop.Type: ApplicationFiled: March 23, 2020Publication date: September 23, 2021Inventors: Pradeep SILVA, Ramkumar SIVAKUMAR, Qubo ZHOU, Xinwang ZHANG, Hanil LEE, Dongyang TANG, Vijayakumar DHANASEKARAN
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Publication number: 20210234457Abstract: Certain aspects of the present disclosure provide a power supply circuit. The power supply circuit generally includes: a switched-mode power supply (SMPS) having an inductive element and a first switch coupled to the inductive element; a feedback path coupled between an output of the SMPS and a control input of the first switch; and a current limit circuit comprising a first capacitive element, a charge circuit coupled to the first capacitive element, a first current source, a first resistive element coupled to the first current source, the capacitive element being coupled to a node between the resistive element and the first current source, a sample-and-hold circuit coupled to the first capacitive element, and a clamp circuit coupled between the sample-and-hold circuit and the feedback path.Type: ApplicationFiled: January 26, 2021Publication date: July 29, 2021Inventors: Pradeep SILVA, Subbarao Surendra CHAKKIRALA, Sherif GALAL
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Patent number: 9035701Abstract: This disclosure relates generally to radio frequency (RF) amplification devices and methods of limiting an RF signal current. Embodiments of the RF amplification device include an RF amplification circuit and a feedback circuit. The RF amplification circuit is configured to amplify an RF input signal so as to generate an amplified RF signal that provides an RF signal current with a current magnitude. The feedback circuit is used to limit the RF signal current. In particular, a thermal sense element in the feedback circuit is configured to generate a sense current, and thermal conduction from the RF amplification circuit sets a sense current level of the sense current as being indicative of the current magnitude of the RF signal current. To limit the RF signal current, the feedback circuit decreases the current magnitude of the RF signal current in response to the sense current level reaching a trigger current level.Type: GrantFiled: August 23, 2012Date of Patent: May 19, 2015Assignee: RF Micro Devices, Inc.Inventors: Derek Schooley, Robert Bennett, James Leake, Pradeep Silva
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Publication number: 20130049871Abstract: This disclosure relates generally to radio frequency (RF) amplification devices and methods of limiting an RF signal current. Embodiments of the RF amplification device include an RF amplification circuit and a feedback circuit. The RF amplification circuit is configured to amplify an RF input signal so as to generate an amplified RF signal that provides an RF signal current with a current magnitude. The feedback circuit is used to limit the RF signal current. In particular, a thermal sense element in the feedback circuit is configured to generate a sense current, and thermal conduction from the RF amplification circuit sets a sense current level of the sense current as being indicative of the current magnitude of the RF signal current. To limit the RF signal current, the feedback circuit decreases the current magnitude of the RF signal current in response to the sense current level reaching a trigger current level.Type: ApplicationFiled: August 23, 2012Publication date: February 28, 2013Applicant: RF MICRO DEVICES, INC.Inventors: Derek Schooley, Robert Bennett, James Leake, Pradeep Silva