Yanduru
Naveen Yanduru, Richardson, TX US
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20120092074 | APPARATUS AND METHOD FOR A SWITCHED CAPACITOR ARCHITECURE FOR MULTI-BAND DOHERTY POWER AMPLIFIERS - An apparatus and method for a switched capacitor architecture for multi-band Doherty power amplifiers are provided. The apparatus is for amplifying Radio Frequency (RF) signals, and the apparatus includes a multi-band Power Amplifier (PA) including a plurality of input matching circuits including switchable capacitors, and a plurality of output matching circuits including the switchable capacitors, wherein the multi-band PA is tunable to more than one RF frequency band. | 04-19-2012 |
Naveen Yanduru, San Diego, CA US
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20130170581 | QUADRATURE DIGITAL-IF TRANSMITTER WITHOUT INTER-STAGE SAW FILTER AND DEVICES USING SAME - An RF transmitter comprises a digital-to-IF circuit block configured to receive a digital in-phase baseband signal and a digital quadrature baseband signal and to up-convert the digital in-phase and quadrature baseband signals to a digital in-phase IF signal and to a digital quadrature IF signal. The wireless RF transmitter further comprises an IF-to-RF circuit block configured to convert the digital in-phase and quadrature IF signals to analog signals and to up-convert the analog in-phase and quadrature IF signals to an RF output signal. The digital-to-IF circuit block comprises pre-compensation circuitry configured to reduce analog impairments associated with the IF-to-RF circuit block. | 07-04-2013 |
20140266383 | Self-Activating Adjustable Power Limiter - A fast response time, self-activating, adjustable threshold limiter including a limiting element LE, a first coupling element CE | 09-18-2014 |
Naveen K. Yanduru, Plano, TX US
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20080318537 | DEVICE AND METHOD FOR RECEIVING AND PROCESSING RF SIGNALS, A METHOD FOR PROVIDING DIGITAL CALIBRATION VALUES FOR SUCH A DEVICE AND A RECEIVER INCORPORATING THE DEVICE - A device for receiving a RF signal over multiple channels, a receiver incorporating the device, a method of providing digital calibration values for a digitally-tunable resonant circuit of the device, and a method of processing an RF signal. In one embodiment the device includes: (1) a low-noise amplifier having a digitally-tunable resonant circuit, (2) a memory configured to store digital calibration values particular to the device and (3) a time-constant controller coupled to the low-noise amplifier and configured to retrieve from the memory at least one of the digital calibration values as a function of a channel to be received and, based on the at least one, to cause the digitally-tunable resonant circuit to provide a time-constant corresponding to the channel to be received. | 12-25-2008 |
Naveen Krishna Yanduru, Plano, TX US
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20100048240 | Integrated Radio Frequency Filters For Multiband Transceivers - A system and method integrates signal filters in a multiband transceiver. A preferred embodiment comprises an amplifier with a first tunable capacitor coupled to a signal input and a tunable filter. The tunable filter comprises an input stage with a first pair of inductors arranged in a dipole configuration and a second tunable capacitor coupled in parallel to the first pair of inductors and an output stage inductively coupled to the input stage, the output stage includes a second pair of inductors also arranged in a dipole configuration and a third tunable capacitor coupled in parallel to the second pair of inductors. The inductors are realized using bond wire or any other high Q material. The first tunable capacitor, the second tunable capacitor, and the third tunable capacitor can be tuned using a master-slave tuning configuration to adjust the operating frequency of the amplifier and the tunable filter to enable frequency band compatibility with multiple communications protocols. | 02-25-2010 |
Naveen Krishna Yanduru, San Diego, CA US
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20120299659 | EFFICIENCY IMPROVEMENT OF DOHERTY POWER AMPLIFIER USING SUPPLY SWITCHING AND DIGITALLY CONTROLLED GATE BIAS MODULATION OF PEAKING AMPLIFIER - An apparatus for amplifying a signal is provided. The apparatus includes a carrier transistor, a peaking transistor, a controller, and a power supply switching unit, wherein the controller controls the power supply switching unit to switch between two or more power supplies and wherein the power supply switching unit provides power from one of the two or more power supplies to the peaking transistor. | 11-29-2012 |