Patents by Inventor Alok Prakash Joshi

Alok Prakash Joshi 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).

  • Patent number: 9893702
    Abstract: A notch filter including an inductor-capacitor tuning circuit is disclosed. The inductor-capacitor tuning circuit may determine a frequency response of the notch filter in accordance with an associated resonant frequency. In some exemplary embodiments, the inductor-capacitor circuit may include a differential inductor divided at a symmetry point and a variable capacitor coupled to the differential inductor at the symmetry point.
    Type: Grant
    Filed: July 27, 2015
    Date of Patent: February 13, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Gireesh Rajendran, Alok Prakash Joshi, Apu Sivadas
  • Patent number: 9692375
    Abstract: Disclosed is a circuit having a differential stage comprising a pair or transistors. The transistors are biased by respective bias transistors. Each bias transistor has a respective feedback network configured to reduce transconductance of the bias transistor, to increase a gain of the differential stage.
    Type: Grant
    Filed: September 17, 2015
    Date of Patent: June 27, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Alok Prakash Joshi, Gireesh Rajendran
  • Patent number: 9608569
    Abstract: A method and apparatus for linearizing a baseband filter are provided. The apparatus is configured to, via a first conducting module, receive a first current signal. The apparatus is further configured to, via a converting module, receive a second current signal, generate a voltage signal based on the second current signal, and apply the voltage signal to the first conducting module. An amount of the second current signal received by the converting module is based on an amount of the first current signal flowing through the first conducting module. The apparatus is also configured to, via a second conducting module, control an output current signal based on the voltage signal. The output current signal is controlled to be a linear replica of the first current signal for in-band frequencies.
    Type: Grant
    Filed: July 22, 2015
    Date of Patent: March 28, 2017
    Assignee: QUALCOMM Incorporated
    Inventors: Bhushan Shanti Asuri, Alok Prakash Joshi, Gireesh Rajendran
  • Patent number: 9595919
    Abstract: Apparatus includes: a mixer configured to mix local a oscillator signal with a baseband signal and output a radio frequency (RF) signal; a first load coupled to the mixer and tuned to an operating frequency; and a second load coupled to the mixer and tuned to a predetermined multiple of the operating frequency.
    Type: Grant
    Filed: June 26, 2015
    Date of Patent: March 14, 2017
    Assignee: QUALCOMM INCORPORATED
    Inventors: Gireesh Rajendran, Alok Prakash Joshi, Ashish Lachhwani
  • Publication number: 20170033757
    Abstract: A notch filter including an inductor-capacitor tuning circuit is disclosed. The inductor-capacitor tuning circuit may determine a frequency response of the notch filter in accordance with an associated resonant frequency. In some exemplary embodiments, the inductor-capacitor circuit may include a differential inductor divided at a symmetry point and a variable capacitor coupled to the differential inductor at the symmetry point.
    Type: Application
    Filed: July 27, 2015
    Publication date: February 2, 2017
    Inventors: Gireesh Rajendran, Alok Prakash Joshi, Apu Sivadas
  • Publication number: 20170033750
    Abstract: Disclosed is a circuit having a differential stage comprising a pair or transistors. The transistors are biased by respective bias transistors. Each bias transistor has a respective feedback network configured to reduce transconductance of the bias transistor, to increase a gain of the differential stage.
    Type: Application
    Filed: September 17, 2015
    Publication date: February 2, 2017
    Inventors: Alok Prakash Joshi, Gireesh Rajendran
  • Publication number: 20160380592
    Abstract: Apparatus includes: a mixer configured to mix local a oscillator signal with a baseband signal and output a radio frequency (RF) signal; a first load coupled to the mixer and tuned to an operating frequency; and a second load coupled to the mixer and tuned to a predetermined multiple of the operating frequency.
    Type: Application
    Filed: June 26, 2015
    Publication date: December 29, 2016
    Inventors: Gireesh Rajendran, Alok Prakash Joshi, Ashish Lachhwani
  • Publication number: 20160294327
    Abstract: A method and apparatus for linearizing a baseband filter are provided. The apparatus is configured to, via a first conducting module, receive a first current signal. The apparatus is further configured to, via a converting module, receive a second current signal, generate a voltage signal based on the second current signal, and apply the voltage signal to the first conducting module. An amount of the second current signal received by the converting module is based on an amount of the first current signal flowing through the first conducting module. The apparatus is also configured to, via a second conducting module, control an output current signal based on the voltage signal. The output current signal is controlled to be a linear replica of the first current signal for in-band frequencies.
    Type: Application
    Filed: July 22, 2015
    Publication date: October 6, 2016
    Inventors: Bhushan Shanti ASURI, Alok Prakash JOSHI, Gireesh RAJENDRAN
  • Publication number: 20160226488
    Abstract: Disclosed is circuitry for operating a switch which sees high voltage swings across its source, gate, drain, and bulk terminals. The circuitry generates one or more bias voltages in proportion to an input voltage swing. The one or more bias voltages may be used to bias the gate and bulk terminals to provide reliable and improved turn OFF performance in the switch.
    Type: Application
    Filed: January 29, 2015
    Publication date: August 4, 2016
    Inventors: Alok Prakash Joshi, Gireesh Rajendran
  • Patent number: 9083075
    Abstract: A device includes multiple transceivers, a coupling block and an antenna. The transceivers operate according to time-division multiple access (TDMA) techniques. The coupling block is designed to enable the multiple transceivers to transmit or receive corresponding signals using the antenna. The multiple transceivers include a first transmitter and a second transmitter. The first transmitter is connected to the antenna via a first coupling network. The second transmitter is connected to the antenna via a series connection of a second coupling network and at least a portion of the first coupling network. Other transmitters are connected to the antenna via a series arrangement of at least a portion of the first coupling network and corresponding coupling networks.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: July 14, 2015
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Alok Prakash Joshi, Gireesh Rajendran, Apu Sivadas
  • Patent number: 8975961
    Abstract: Circuits for reducing power consumption in power amplifier circuits are disclosed. In certain embodiments, a circuit for power control in the transmitter includes a coupling circuit, a first power amplifier circuit and a second power amplifier circuit. The coupling circuit includes a primary winding inductively associated with a first secondary winding and a second secondary winding. The coupling circuit provides a signal at output terminals of the first secondary winding and the second secondary winding in response to a signal at the primary winding. A first power amplifier circuit is coupled with output terminals of the first secondary winding, and a second power amplifier is coupled with output terminals of the second secondary winding. The first power amplifier circuit and second power amplifier circuit are configured to be enabled or disabled based on a bias voltage.
    Type: Grant
    Filed: May 24, 2013
    Date of Patent: March 10, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Alok Prakash Joshi, Gireesh Rajendran
  • Publication number: 20140347124
    Abstract: Circuits for reducing power consumption in power amplifier circuits are disclosed. In certain embodiments, a circuit for power control in the transmitter includes a coupling circuit, a first power amplifier circuit and a second power amplifier circuit. The coupling circuit includes a primary winding inductively associated with a first secondary winding and a second secondary winding. The coupling circuit provides a signal at output terminals of the first secondary winding and the second secondary winding in response to a signal at the primary winding. A first power amplifier circuit is coupled with output terminals of the first secondary winding, and a second power amplifier is coupled with output terminals of the second secondary winding. The first power amplifier circuit and second power amplifier circuit are configured to be enabled or disabled based on a bias voltage.
    Type: Application
    Filed: May 24, 2013
    Publication date: November 27, 2014
    Applicant: Texas Instruments Incorporated
    Inventors: Alok Prakash Joshi, Gireesh Rajendran
  • Publication number: 20140312474
    Abstract: A semiconductor package having a die having a plurality of electrically continuous die wire bonding sites includes a first die wire bonding site and a second die wire bonding site. The package includes a substrate having a plurality of electrically continuous substrate wire bonding sites including a first substrate wire bonding site and a second substrate wire bonding site. A first bondwire is connected between the first die wire bonding site and the first substrate wire bonding site and a second bondwire is connected between the second die wire bonding site and the second substrate wire bonding site. The first and second bondwires lie in adjacent, substantially parallel bondwire planes. The second bondwire is substantially skewed with respect to said first bondwire.
    Type: Application
    Filed: April 19, 2013
    Publication date: October 23, 2014
    Applicant: Texas Instruments Incorporated
    Inventors: Alok Prakash Joshi, Gireesh Rajendran, Brian Parks
  • Publication number: 20130034088
    Abstract: A device includes multiple transceivers, a coupling block and an antenna. The transceivers operate according to time-division multiple access (TDMA) techniques. The coupling block is designed to enable the multiple transceivers to transmit or receive corresponding signals using the antenna. The multiple transceivers include a first transmitter and a second transmitter. The first transmitter is connected to the antenna via a first coupling network. The second transmitter is connected to the antenna via a series connection of a second coupling network and at least a portion of the first coupling network. Other transmitters are connected to the antenna via a series arrangement of at least a portion of the first coupling network and corresponding coupling networks.
    Type: Application
    Filed: August 4, 2011
    Publication date: February 7, 2013
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Alok Prakash Joshi, Gireesh Rajendran, Apu Sivadas
  • Patent number: 8249524
    Abstract: A near field communication (NFC) transceiver contains a transmitter portion to generate a transmit wireless signal, and a receiver portion to receive and process a receive wireless signal. The circuit further contains a shunt capacitor, a switch, and an antenna interface to couple the transmitter portion and the receiver portion to an antenna designed to communicate with external antennas by inductive coupling. The switch couples the shunt capacitor in parallel with the antenna in one operational mode, and decouples the shunt capacitor from the antenna in another operational mode. Transmit and receive performance of the NFC transceiver are enhanced as a result.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: August 21, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Yogesh Darwhekar, Alok Prakash Joshi, Gireesh Rajendran, Subhashish Mukherjee, Apu Sivadas
  • Patent number: 8143955
    Abstract: Oscillator circuit for radio frequency transceivers. An oscillator circuit includes a first oscillator that generates a signal having a first frequency and a second oscillator that generates a signal having a second frequency. The oscillator circuit includes a mixer that is responsive to the signal having the first frequency and the signal having the second frequency to provide a signal having a third frequency and one or more frequency components. The oscillator circuit includes a filter that is responsive to the signal from the mixer to attenuate the one or more frequency components and provide a signal having a desired frequency. The oscillator circuit includes a correction circuit to correct a drift in at least one of the first frequency and the second frequency by controlling the second frequency, thereby correcting the drift in the third frequency and the desired frequency.
    Type: Grant
    Filed: February 4, 2010
    Date of Patent: March 27, 2012
    Assignee: Texas Instruments Incorporated
    Inventors: Gireesh Rajendran, Debapriya Sahu, Alok Prakash Joshi, Ashish Lachhwani
  • Publication number: 20120064826
    Abstract: A near field communication (NFC) transceiver contains a transmitter portion to generate a transmit wireless signal, and a receiver portion to receive and process a receive wireless signal. The circuit further contains a shunt capacitor, a switch, and an antenna interface to couple the transmitter portion and the receiver portion to an antenna designed to communicate with external antennas by inductive coupling. The switch couples the shunt capacitor in parallel with the antenna in one operational mode, and decouples the shunt capacitor from the antenna in another operational mode. Transmit and receive performance of the NFC transceiver are enhanced as a result.
    Type: Application
    Filed: September 10, 2010
    Publication date: March 15, 2012
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Yogesh Darwhekar, Alok Prakash Joshi, Gireesh Rajendran, Subhashish Mukherjee, Apu Sivadas
  • Publication number: 20110187463
    Abstract: Oscillator circuit for radio frequency transceivers. An oscillator circuit includes a first oscillator that generates a signal having a first frequency and a second oscillator that generates a signal having a second frequency. The oscillator circuit includes a mixer that is responsive to the signal having the first frequency and the signal having the second frequency to provide a signal having a third frequency and one or more frequency components. The oscillator circuit includes a filter that is responsive to the signal from the mixer to attenuate the one or more frequency components and provide a signal having a desired frequency. The oscillator circuit includes a correction circuit to correct a drift in at least one of the first frequency and the second frequency by controlling the second frequency, thereby correcting the drift in the third frequency and the desired frequency.
    Type: Application
    Filed: February 4, 2010
    Publication date: August 4, 2011
    Applicant: Texas Instruments Incorporated
    Inventors: Gireesh Rajendran, Debapriya Sahu, Alok Prakash Joshi, Ashish Lachwani