Patents by Inventor Chinmaya Mishra

Chinmaya Mishra 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).

  • Publication number: 20180205413
    Abstract: 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: Application
    Filed: January 16, 2018
    Publication date: July 19, 2018
    Inventors: Chirag Dipak PATEL, Lai Kan LEUNG, Zhang JIN, Chinmaya MISHRA, Ravi SRIDHARA, Youngchang YOON
  • Patent number: 8963610
    Abstract: An adaptable mixer device is operable in a first mode and a second mode and includes a first set of mixer units operable in the first mode and a second set of mixer units operable in the second mode. The second set of mixer units includes at least one mixer unit that is common to both the first set of mixer units and the second set of mixer units. The second set of mixer units also includes a plurality of mixer units that are not in the first set of mixer units. Similarly, the first set of mixer units including a plurality of mixer units that are not in the second set of mixer units.
    Type: Grant
    Filed: May 10, 2012
    Date of Patent: February 24, 2015
    Assignee: QUALCOMM Incorporated
    Inventors: Chinmaya Mishra, Hongyan Yan, Junxiong Deng
  • Patent number: 8810322
    Abstract: A wideband frequency generator has two or more oscillators for different frequency bands, disposed on the same die within a flip chip package. Coupling between inductors of the two oscillators is reduced by placing one inductor on the die and the other inductor on the package, separating the inductors by a solder bump diameter. The loosely coupled inductors allow manipulation of the LC tank circuit of one of the oscillators to increase the bandwidth of the other oscillator, and vice versa. Preventing undesirable mode of oscillation in one of the oscillators may be achieved by loading the LC tank circuit of the other oscillator with a large capacitance, such as the entire capacitance of the coarse tuning bank of the other oscillator. Preventing the undesirable mode may also be achieved by decreasing the quality factor of the other oscillator's LC tank and thereby increasing the losses in the tank circuit.
    Type: Grant
    Filed: November 14, 2011
    Date of Patent: August 19, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra, Maulin Bhagat, Zhang Jin
  • Patent number: 8594609
    Abstract: A sub-harmonic mixer includes a first transistor having a source and a drain and a second transistor having a source connected to the source of the first transistor and a drain connected to the drain of the first transistor. A mixing transistor is configured to be biased in a linear operating region. The mixing transistor includes a drain coupled to the sources of the first transistor and the second transistor. The mixing transistor has its drain driven by a signal at twice a local oscillator (LO) frequency and its gate driven by a radio frequency (RF) signal while the mixing transistor is biased in the linear region such that a process of frequency doubling and mixing are performed simultaneously.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: November 26, 2013
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes Garcia, Chinmaya Mishra, Scott Kevin Reynolds
  • Publication number: 20130300489
    Abstract: An adaptable mixer device is operable in a first mode and a second mode and includes a first set of mixer units operable in the first mode and a second set of mixer units operable in the second mode. The second set of mixer units includes at least one mixer unit that is common to both the first set of mixer units and the second set of mixer units. The second set of mixer units also includes a plurality of mixer units that are not in the first set of mixer units. Similarly, the first set of mixer units including a plurality of mixer units that are not in the second set of mixer units.
    Type: Application
    Filed: May 10, 2012
    Publication date: November 14, 2013
    Applicant: QUALCOMM INCORPORATED
    Inventors: Chinmaya Mishra, Hongyan Yan, Junxiong Deng
  • Patent number: 8415991
    Abstract: A method includes setting a mode of operation of a buffer circuit outputting an output signal. The mode of operation is set to a first mode of operation or a second mode of operation. The output signal is substantially in-phase with an input signal received by the buffer circuit when the mode of operation is the first mode. The output signal is substantially out of phase with the input signal when the mode of operation is the second mode.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: April 9, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Patent number: 8242854
    Abstract: A circuit for a voltage controlled oscillator (VCO) buffer is described. The circuit includes a first capacitor connected to an input of the VCO buffer that is connected to a VCO core. The circuit also includes a second capacitor connected to the input of the VCO buffer and the gate of a p-type metal-oxide-semiconductor field effect (PMOS) transistor. The circuit further includes a first switch connected to the first capacitor and the gate of the PMOS transistor. The circuit also includes a third capacitor connected to the input of the VCO buffer. The circuit further includes a fourth capacitor connected to the input of the VCO buffer and the gate of an n-type metal-oxide-semiconductor field effect (NMOS) transistor. The circuit also includes a second switch connected to the third capacitor and the gate of the NMOS transistor.
    Type: Grant
    Filed: June 28, 2010
    Date of Patent: August 14, 2012
    Assignee: QUALCOMM, Incorporated
    Inventors: Chinmaya Mishra, Rajagopalan Rangarajan, Hongyan Yan
  • Publication number: 20120161850
    Abstract: A method includes setting a mode of operation of a buffer circuit outputting an output signal. The mode of operation is set to a first mode of operation or a second mode of operation. The output signal is substantially in-phase with an input signal received by the buffer circuit when the mode of operation is the first mode. The output signal is substantially out of phase with the input signal when the mode of operation is the second mode.
    Type: Application
    Filed: February 28, 2012
    Publication date: June 28, 2012
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Publication number: 20120068777
    Abstract: A wideband frequency generator has two or more oscillators for different frequency bands, disposed on the same die within a flip chip package. Coupling between inductors of the two oscillators is reduced by placing one inductor on the die and the other inductor on the package, separating the inductors by a solder bump diameter. The loosely coupled inductors allow manipulation of the LC tank circuit of one of the oscillators to increase the bandwidth of the other oscillator, and vice versa. Preventing undesirable mode of oscillation in one of the oscillators may be achieved by loading the LC tank circuit of the other oscillator with a large capacitance, such as the entire capacitance of the coarse tuning bank of the other oscillator. Preventing the undesirable mode may also be achieved by decreasing the quality factor of the other oscillator's LC tank and thereby increasing the losses in the tank circuit.
    Type: Application
    Filed: November 14, 2011
    Publication date: March 22, 2012
    Applicant: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra, Maulin Bhagat, Zhang Jin
  • Patent number: 8058934
    Abstract: A wideband frequency generator has two or more oscillators for different frequency bands, disposed on the same die within a flip chip package. Coupling between inductors of the two oscillators is reduced by placing one inductor on the die and the other inductor on the package, separating the inductors by a solder bump diameter. The loosely coupled inductors allow manipulation of the LC tank circuit of one of the oscillators to increase the bandwidth of the other oscillator, and vice versa. Preventing undesirable mode of oscillation in one of the oscillators may be achieved by loading the LC tank circuit of the other oscillator with a large capacitance, such as the entire capacitance of the coarse tuning bank of the other oscillator. Preventing the undesirable mode may also be achieved by decreasing the quality factor of the other oscillator's LC tank and thereby increasing the losses in the tank circuit.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: November 15, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra, Maulin Bhagat, Zhang Jin
  • Patent number: 8044739
    Abstract: A capacitance switching element includes first and second capacitors connected in series by transistors. The gates of the transistors are biased by a first signal through one set of resistors, and the sources and drains are biased by a second signal through a second set of resistors. The signals are level-shifted and may be complimentary. To turn the element ON, the first signal may be set to VDD and the second signal may be set to zero. To turn the element OFF, the first signal may be set to a multiple of VDD/2 and the second signal may be set to the multiple plus one of VDD/2. When the element is used in an oscillator tuning circuit, the voltage stress on the transistors is reduced and the transistors may be fabricated with thin oxide. The oscillator may be used in a transceiver of a cellular access terminal.
    Type: Grant
    Filed: June 9, 2009
    Date of Patent: October 25, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Patent number: 8018293
    Abstract: An oscillator includes a resonator, a first and a second p-type transistor, and a first and a second n-type transistor. The resonator has a first terminal and a second terminal. The first p-type transistor is switchably connected to the first terminal while the second p-type transistor is switchably connected to the second terminal. A first drain of the first n-type transistor and the second drain of the second n-type transistor are electrically connected to the first terminal and the second terminal, respectively. The oscillator is capable of operating in an NMOS only mode and in a CMOS mode.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: September 13, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Publication number: 20110183641
    Abstract: A sub-harmonic mixer includes a first transistor having a source and a drain and a second transistor having a source connected to the source of the first transistor and a drain connected to the drain of the first transistor. A mixing transistor is configured to be biased in a linear operating region. The mixing transistor includes a drain coupled to the sources of the first transistor and the second transistor. The mixing transistor has its drain driven by a signal at twice a local oscillator (LO) frequency and its gate driven by a radio frequency (RF) signal while the mixing transistor is biased in the linear region such that a process of frequency doubling and mixing are performed simultaneously.
    Type: Application
    Filed: March 11, 2011
    Publication date: July 28, 2011
    Inventors: ALBERTO VALDES GARCIA, CHINMAYA MISHRA, SCOTT KEVIN REYNOLDS
  • Patent number: 7962114
    Abstract: A sub-harmonic mixer includes a first transistor having a source and a drain and a second transistor having a source connected to the source of the first transistor and a drain connected to the drain of the first transistor. A mixing transistor is configured to be biased in a linear operating region. The mixing transistor includes a drain coupled to the sources of the first transistor and the second transistor. The mixing transistor has its drain driven by a signal at twice a local oscillator (LO) frequency and its gate driven by a radio frequency (RF) signal while the mixing transistor is biased in the linear region such that a process of frequency doubling and mixing are performed simultaneously.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: June 14, 2011
    Assignee: International Business Machines Corporation
    Inventors: Alberto Valdes Garcia, Chinmaya Mishra, Scott Kevin Reynolds
  • Publication number: 20110089991
    Abstract: An RF buffer circuit for a voltage controlled oscillator (VCO) includes dynamic biasing circuitry to selectively flip the phase of the output voltage waveform. In a CMOS implementation, a PMOS/NMOS pair is employed in an output path. During a high (voltage) swing mode condition, the phase of the output is flipped such that the output waveform is in phase with the voltages appearing at the gates of the PMOS/NMOS pair. The technique thereby reduces peak gate-to-drain voltages and allows for improved reliability of the MOS devices in a configuration amenable to low phase noise and low power consumption.
    Type: Application
    Filed: October 21, 2009
    Publication date: April 21, 2011
    Applicant: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Patent number: 7928807
    Abstract: The present invention provides a frequency synthesizer for a wireless communication system. The synthesizer includes an oscillator that generates an electronic signal as well as frequency dividers, frequency selectors and mixers. The signal generated by the oscillator is sequentially divided by the frequency dividers to produce a first group of frequencies, and the selectors and mixers are then capable of mixing the first group of frequencies according to instructions from control bits to produce a second group of frequencies which constitute UWB band frequencies. In this manner, the synthesizer can generate all 14 UWB band frequencies or particular UWB band groups using a single oscillator. One of the frequencies generated by the dividers can also be used as the baseband clock signal without requiring an additional frequency source.
    Type: Grant
    Filed: September 16, 2005
    Date of Patent: April 19, 2011
    Assignee: QUALCOMM Incorporated
    Inventor: Chinmaya Mishra
  • Publication number: 20100327986
    Abstract: A circuit for a voltage controlled oscillator (VCO) buffer is described. The circuit includes a first capacitor connected to an input of the VCO buffer that is connected to a VCO core. The circuit also includes a second capacitor connected to the input of the VCO buffer and the gate of a p-type metal-oxide-semiconductor field effect (PMOS) transistor. The circuit further includes a first switch connected to the first capacitor and the gate of the PMOS transistor. The circuit also includes a third capacitor connected to the input of the VCO buffer. The circuit further includes a fourth capacitor connected to the input of the VCO buffer and the gate of an n-type metal-oxide-semiconductor field effect (NMOS) transistor. The circuit also includes a second switch connected to the third capacitor and the gate of the NMOS transistor.
    Type: Application
    Filed: June 28, 2010
    Publication date: December 30, 2010
    Applicant: QUALCOMM INCORPORATED
    Inventors: Chinmaya Mishra, Rajagopalan Rangarajan, Hongyan Yan
  • Publication number: 20100321124
    Abstract: An oscillator includes a resonator, a first and a second p-type transistor, and a first and a second n-type transistor. The resonator has a first terminal and a second terminal. The first p-type transistor is switchably connected to the first terminal while the second p-type transistor is switchably connected to the second terminal. A first drain of the first n-type transistor and the second drain of the second n-type transistor are electrically connected to the first terminal and the second terminal, respectively. The oscillator is capable of operating in an NMOS only mode and in a CMOS mode.
    Type: Application
    Filed: June 17, 2009
    Publication date: December 23, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Publication number: 20100308932
    Abstract: A capacitance switching element includes first and second capacitors connected in series by transistors. The gates of the transistors are biased by a first signal through one set of resistors, and the sources and drains are biased by a second signal through a second set of resistors. The signals are level-shifted and may be complimentary. To turn the element ON, the first signal may be set to VDD and the second signal may be set to zero. To turn the element OFF, the first signal may be set to a multiple of VDD/2 and the second signal may be set to the multiple plus one of VDD/2. When the element is used in an oscillator tuning circuit, the voltage stress on the transistors is reduced and the transistors may be fabricated with thin oxide. The oscillator may be used in a transceiver of a cellular access terminal.
    Type: Application
    Filed: June 9, 2009
    Publication date: December 9, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra
  • Publication number: 20100308924
    Abstract: A wideband frequency generator has two or more oscillators for different frequency bands, disposed on the same die within a flip chip package. Coupling between inductors of the two oscillators is reduced by placing one inductor on the die and the other inductor on the package, separating the inductors by a solder bump diameter. The loosely coupled inductors allow manipulation of the LC tank circuit of one of the oscillators to increase the bandwidth of the other oscillator, and vice versa. Preventing undesirable mode of oscillation in one of the oscillators may be achieved by loading the LC tank circuit of the other oscillator with a large capacitance, such as the entire capacitance of the coarse tuning bank of the other oscillator. Preventing the undesirable mode may also be achieved by decreasing the quality factor of the other oscillator's LC tank and thereby increasing the losses in the tank circuit.
    Type: Application
    Filed: June 3, 2009
    Publication date: December 9, 2010
    Applicant: QUALCOMM Incorporated
    Inventors: Rajagopalan Rangarajan, Chinmaya Mishra, Maulin Bhagat, Zhang Jin