Patents by Inventor Chirag Dipak Patel
Chirag Dipak Patel 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: 10630328Abstract: An apparatus is disclosed for current-mode filtering using current steering. In an example aspect, the apparatus includes a filter. The filter includes a current-steering node, a first output node, a second output node, a wideband path, and a narrowband path. The wideband path is coupled between the current-steering node and the first output node. The wideband path includes a wideband low-pass filter configured to pass frequencies within a wide passband. The narrowband path is coupled between the current-steering node and the second output node. The narrowband path includes a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband.Type: GrantFiled: August 8, 2018Date of Patent: April 21, 2020Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung
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Publication number: 20200076387Abstract: An apparatus is disclosed for complementary variable gain amplification. In an example aspect, the apparatus includes a variable gain amplifier that includes multiple amplifiers. The multiple amplifiers include at least one first amplifier and at least one second amplifier cascaded together in series. The first amplifier includes a first set of transistors having a first doping type. At least a portion of the first set of transistors is configured to implement a first current mirror. The second amplifier includes a second set of transistors having a second doping type. At least a portion of the second set of transistors is configured to implement a second current mirror. The second current mirror is coupled to the first current mirror.Type: ApplicationFiled: August 28, 2018Publication date: March 5, 2020Inventors: Timothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung, Xinmin Yu
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Publication number: 20200052729Abstract: An apparatus is disclosed for current-mode filtering using current steering. In an example aspect, the apparatus includes a filter. The filter includes a current-steering node, a first output node, a second output node, a wideband path, and a narrowband path. The wideband path is coupled between the current-steering node and the first output node. The wideband path includes a wideband low-pass filter configured to pass frequencies within a wide passband. The narrowband path is coupled between the current-steering node and the second output node. The narrowband path includes a narrowband low-pass filter configured to pass a portion of the frequencies that are within a narrow passband.Type: ApplicationFiled: August 8, 2018Publication date: February 13, 2020Inventors: Timothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung
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Patent number: 10469122Abstract: Various aspects described herein relate to low-loss multi-band multiplexing schemes for a wireless communications system, for example, a 5th Generation (5G) New Radio (NR) system. In an aspect, a multiplexer for multi-band wireless communications comprises at least one tuning component configured to transmit or receive at least one signal within a frequency band that is selected from a plurality of frequency bands. The multiplexer further comprises at least one combining component, communicatively coupled with the at least one tuning component, configured to transmit or receive the at least one signal within the selected frequency band. In an aspect, the at least one tuning component is integrated on a chip and the at least one combining component is not integrated on the chip.Type: GrantFiled: January 16, 2018Date of Patent: November 5, 2019Assignee: QUALCOMM IncorporatedInventors: Chirag Dipak Patel, Lai Kan Leung, Zhang Jin, Chinmaya Mishra, Ravi Sridhara, Youngchang Yoon
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Patent number: 10439593Abstract: Certain aspects of the present disclosure relate to multi-band filter architectures and methods for filtering signals using the multi-band filter architectures. One example multi-band filter generally includes a transconductance-capacitance (gm-C) filter and a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit.Type: GrantFiled: September 22, 2017Date of Patent: October 8, 2019Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Lai Kan Leung, Chirag Dipak Patel, Rajagopalan Rangarajan
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Publication number: 20190296692Abstract: A switchable amplifier exhibits multiple modes of operation including a current mode and a voltage mode. The switchable amplifier includes a first transistor having a gate terminal coupled to a drain terminal, one or more second transistors having a gate terminal coupled to the gate terminal of the first transistor, a third transistor and a bias resistor across the third transistor. The third transistor is coupled between the gate terminal of the first transistor and the gate terminal of the one or more second transistors.Type: ApplicationFiled: August 3, 2018Publication date: September 26, 2019Inventors: Chirag Dipak PATEL, Lai Kan LEUNG, Xinmin YU, Timothy Donald GATHMAN
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Publication number: 20190238117Abstract: The present disclosure provides an apparatus that includes a first mixer circuit configured to convert between an RF signal and an IF signal based at least in part on an local oscillator (LO) signal. The first mixer circuit is electrically coupled to a first node that is configured to receive the LO signal and a first bias voltage, a second node that is configured to receive the RF signal or the IF signal, and a third node that is configured to provide the IF signal or the RF signal. The apparatus further includes a second mixer circuit electrically coupled to a fourth node configured to receive the LO signal and a second bias voltage, the second node, and the third node. The second bias voltage has a voltage level that is offset from the first bias voltage.Type: ApplicationFiled: January 24, 2019Publication date: August 1, 2019Inventors: Xinmin YU, Lai Kan LEUNG, Yunfei FENG, Chirag Dipak PATEL
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Patent number: 10305517Abstract: An apparatus is disclosed for current-mode filtering with switching. In an example aspect, the apparatus includes a filter including two input nodes, two output nodes, two differential paths, two bypass nodes respectively coupled between the two input nodes and the two output nodes along the two differential paths, a high-pass filter coupled between the two bypass nodes and the two output nodes, two low-pass switches, a band-pass switch, and a low-pass filter coupled in series with the high-pass filter along the two differential paths. The high-pass filter includes two series capacitors, which are respectively coupled between the two bypass nodes and the two output nodes, and two shunt inductors, which are respectively coupled to the two bypass nodes. The two low-pass switches are respectively coupled in parallel with the two series capacitors. The band-pass switch is coupled in series between the two shunt inductors.Type: GrantFiled: July 5, 2018Date of Patent: May 28, 2019Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung
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Publication number: 20190097608Abstract: Certain aspects of the present disclosure relate to multi-band filter architectures and methods for filtering signals using the multi-band filter architectures. One example multi-band filter generally includes a transconductance-capacitance (gm-C) filter and a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit.Type: ApplicationFiled: September 22, 2017Publication date: March 28, 2019Inventors: Timothy Donald GATHMAN, Lai Kan LEUNG, Chirag Dipak PATEL, Rajagopalan RANGARAJAN
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Patent number: 10193580Abstract: Devices and techniques are described to extract specific frequency band signals from a wide-band radio-frequency signal. A network entity may include an antenna for receiving the wide-band radio-frequency signal and may include a receiver circuit for processing the wide-band radio-frequency signal. The receiver circuit may include a transconductance amplifier and a plurality of single-band circuits. The transconductance amplifier may be configured to generate an amplified wide-band radio-frequency signal and send it to one or more of the single-band circuits. Each single-band circuit may be configured to extract a different frequency band signal from the amplified wide-band radio-frequency signal.Type: GrantFiled: March 20, 2018Date of Patent: January 29, 2019Assignee: QUALCOMM IncorporatedInventors: Chirag Dipak Patel, Lai Kan Leung, Xinmin Yu, Timothy Donald Gathman, Ravi Sridhara
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Patent number: 10153934Abstract: In certain aspects, a circuit comprises a low noise amplifier (LNA) configured to receive a radio frequency (RF) signal, a first mixer coupled to the low noise amplifier (LNA), and a first trans-impedance filter coupled to the first mixer. The first trans-impedance filter comprises a tunable inductor and capacitor (LC) network configured to be a portion of a doubly terminated LC ladder filter and a trans-impedance amplifier (TIA) coupled to the tunable inductor and capacitor (LC) network. The circuit further comprises a second mixer coupled to the low noise amplifier (LNA) and a second trans-impedance filter coupled to the second mixer.Type: GrantFiled: October 11, 2017Date of Patent: December 11, 2018Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Chirag Dipak Patel, Lai Kan Leung, Xinmin Yu, Rajagopalan Rangarajan
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Publication number: 20180278277Abstract: Devices and techniques are described to extract specific frequency band signals from a wide-band radio-frequency signal. A network entity may include an antenna for receiving the wide-band radio-frequency signal and may include a receiver circuit for processing the wide-band radio-frequency signal. The receiver circuit may include a transconductance amplifier and a plurality of single-band circuits. The transconductance amplifier may be configured to generate an amplified wide-band radio-frequency signal and send it to one or more of the single-band circuits. Each single-band circuit may be configured to extract a different frequency band signal from the amplified wide-band radio-frequency signal.Type: ApplicationFiled: March 20, 2018Publication date: September 27, 2018Inventors: Chirag Dipak Patel, Lai Kan Leung, Xinmin Yu, Timothy Donald Gathman, Ravi Sridhara
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Patent number: 10033337Abstract: A multi-stage low-noise amplifier (LNA) device with a band pass response includes a first LNA in series with a second LNA. The device further includes multiple outputs coupled to the second LNA. Each of the outputs is capable of being active at the same time. The device further includes a high pass filter coupled between the first LNA and the second LNA.Type: GrantFiled: October 6, 2016Date of Patent: July 24, 2018Assignee: QUALCOMM IncorporatedInventors: Chirag Dipak Patel, Sasha Vujcic, Aleksandar Miodrag Tasic, Timothy Gathman, Wu-Hsin Chen, Klaas Van Zalinge
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Publication number: 20180205413Abstract: Various aspects described herein relate to low-loss multi-band multiplexing schemes for a wireless communications system, for example, a 5th Generation (5G) New Radio (NR) system. In an aspect, a multiplexer for multi-band wireless communications comprises at least one tuning component configured to transmit or receive at least one signal within a frequency band that is selected from a plurality of frequency bands. The multiplexer further comprises at least one combining component, communicatively coupled with the at least one tuning component, configured to transmit or receive the at least one signal within the selected frequency band. In an aspect, the at least one tuning component is integrated on a chip and the at least one combining component is not integrated on the chip.Type: ApplicationFiled: January 16, 2018Publication date: July 19, 2018Inventors: Chirag Dipak PATEL, Lai Kan LEUNG, Zhang JIN, Chinmaya MISHRA, Ravi SRIDHARA, Youngchang YOON
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Patent number: 10014845Abstract: A circuit includes an active balun having an RF signal input and having differential signal outputs, the active balun including a first pair of transistors coupled to the RF signal input, the first pair of transistors including a first transistor of a first type and a second transistor of a second type, wherein the first type and second type are complementary; and an intermodulation distortion (IMD) sink circuit having an operational amplifier (op amp) coupled between a first node and a second node, wherein the first transistor and second transistor are coupled in series between the first node and the second node.Type: GrantFiled: March 28, 2017Date of Patent: July 3, 2018Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Chirag Dipak Patel, Sasha Vujcic, Aleksandar Miodrag Tasic, Wu-Hsin Chen, Klaas van Zalinge
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Patent number: 9991875Abstract: A reconfigurable filter circuit has a first path including a transimpedance amplifier (TIA). The transimpedance amplifier has an input that receives an input current and an output that outputs a voltage. The reconfigurable filter circuit also includes a switchable feedback path. The switchable feedback path includes a first low-pass filter coupled to an output of the TIA. The switchable feedback path also includes a first switch to couple the feedback path to provide a feedback current to the first path resulting in a bandpass response in the output voltage when the switch is closed and a low-pass response in the output voltage when the switch is open.Type: GrantFiled: November 15, 2016Date of Patent: June 5, 2018Assignee: QUALCOMM IncorporatedInventors: Timothy Donald Gathman, Ojas Choksi, Aleksandar Miodrag Tasic, Sasha Vujcic, Chirag Dipak Patel, Wu-Hsin Chen, Klaas Van Zalinge
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Patent number: 9948239Abstract: A method and apparatus are disclosed for a configurable mixer capable of operating in a linear, a legacy, and a low-power mode. In the linear mode, the configurable mixer is configured to operate as a double-balanced mixer to multiply a first differential signal by a second differential signal. In the legacy mode, the configurable mixer is configured to as a double-balanced mixer to multiply a differential signal by a single-ended signal. In the low-power mode, the configurable mixer is configured to operate as a single-balanced mixer to multiply a differential signal by a single-ended signal. The operating mode of the configurable mixer may be based, at least in part, on a mode control signal. In some embodiments, the configurable mixer may be included in an analog front end of a wireless communication device.Type: GrantFiled: September 21, 2016Date of Patent: April 17, 2018Assignee: QUALCOMM IncorporatedInventors: Kiyong Choi, Yi Zeng, Hong Sun Kim, Sasha Vujcic, Chirag Dipak Patel, Aleksandar Miodrag Tasic, Timothy Donald Gathman, Wu-Hsin Chen, Klaas van Zalinge
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Publication number: 20180083574Abstract: A method and apparatus are disclosed for a configurable mixer capable of operating in a linear, a legacy, and a low-power mode. In the linear mode, the configurable mixer is configured to operate as a double-balanced mixer to multiply a first differential signal by a second differential signal. In the legacy mode, the configurable mixer is configured to as a double-balanced mixer to multiply a differential signal by a single-ended signal. In the low-power mode, the configurable mixer is configured to operate as a single-balanced mixer to multiply a differential signal by a single-ended signal. The operating mode of the configurable mixer may be based, at least in part, on a mode control signal. In some embodiments, the configurable mixer may be included in an analog front end of a wireless communication device.Type: ApplicationFiled: September 21, 2016Publication date: March 22, 2018Inventors: Kiyong Choi, Yi Zeng, Hong Sun Kim, Sasha Vujcic, Chirag Dipak Patel, Aleksandar Miodrag Tasic, Timothy Donald Gathman, Wu-Hsin Chen, Klaas van Zalinge
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Publication number: 20180048294Abstract: A circuit includes an active balun having an RF signal input and having differential signal outputs, the active balun including a first pair of transistors coupled to the RF signal input, the first pair of transistors including a first transistor of a first type and a second transistor of a second type, wherein the first type and second type are complementary; and an intermodulation distortion (IMD) sink circuit having an operational amplifier (op amp) coupled between a first node and a second node, wherein the first transistor and second transistor are coupled in series between the first node and the second node.Type: ApplicationFiled: March 28, 2017Publication date: February 15, 2018Inventors: Timothy Donald Gathman, Chirag Dipak Patel, Sasha Vujcic, Aleksandar Miodrag Tasic, Wu-Hsin Chen, Klaas van Zalinge
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Publication number: 20180048293Abstract: A reconfigurable filter circuit has a first path including a transimpedance amplifier (TIA). The transimpedance amplifier has an input that receives an input current and an output that outputs a voltage. The reconfigurable filter circuit also includes a switchable feedback path. The switchable feedback path includes a first low-pass filter coupled to an output of the TIA. The switchable feedback path also includes a first switch to couple the feedback path to provide a feedback current to the first path resulting in a bandpass response in the output voltage when the switch is closed and a low-pass response in the output voltage when the switch is open.Type: ApplicationFiled: November 15, 2016Publication date: February 15, 2018Inventors: Timothy Donald GATHMAN, Ojas CHOKSI, Aleksandar Miodrag TASIC, Sasha VUJCIC, Chirag Dipak PATEL, Wu-Hsin CHEN, Klaas VAN ZALINGE