Motorola Corporation

Motorola Mobility LLC

Andrew Merritt Khan

Lawrence F Cygan

George Francis Opas

Curtis M Williams

Robert Louis Palandech

Lawrence Edwin Connell

Pallab Midya

Steven F Gillig

Timothy J Collins

Richard Stanley Rachwalski

John K Grosspietsch

Christopher P Thron

Richard S Bickham

Robert Perri

Michael K Bullock

Shamik Mukherjee

An H-bridge circuit formed from two sub-circuits coupled to each other by a load network across a respective load node of each of the sub-circuits. Each sub-circuit of the two sub-circuits comprises a depletion mode upper transistor with a second electrode coupled to a first electrode of a lower transistor. The load node of the sub-circuit is disposed between the second electrode of the upper transistor and the first electrode of a lower transistor. There is a first voltage supply node coupled to a first electrode of the upper transistor and a second voltage supply node is coupled to a second electrode of the lower transistor. An upper driver transistor selectively couples a gate electrode of the upper transistor to an upper drive voltage node, the upper driver transistor having a control electrode coupled to an upper switched voltage supply circuit. There is also a lower switched voltage supply circuit coupled to a gate electrode of the lower transistor and a voltage dependent non-linear resistor is coupled across the gate electrode and second electrode of the upper transistor. In use, when the lower transistor and upper driver transistor are in a non-conductive state a potential difference across the voltage dependent non-linear resistor is sufficiently small enough to control the upper transistor into a conductive state. Conversely, when the lower transistor and upper driver transistor are in a conductive state the potential difference across the voltage dependent non-linear resistor provides a negative bias to the gate electrode of the upper transistor that has a negative potential sufficient to control the upper transistor into a non-conductive state.

Circuit with a voltage dependent resistor for controlling an on/off state of a transistor

A method and apparatus for direct conversion of digital data to high power RF signals, known as DDRF. The method and apparatus receive a digital signal, create a digital modulated signal therefrom, and amplify the modulated signal with an H-bridge Power Amplifier for transmission. DDRF uses a multi-level H-bridge amplification circuit to establish a more power efficient digital transmitter.

Method and apparatus for direct digital to radio frequency conversion

A tray () comprises electrically conductive material and has at least one hand-graspable fixture (). This hand-graspable fixture comprises an electrical conductor () disposed in a location that is likely to be operably interacted with by a human who grasps the hand-graspable fixture. A capacitively-coupled RFID tag is then disposed on the hand-graspable fixture with a first antenna plate () being electrically coupled to the tray and a second antenna plate () that electrically couples to the electrical conductor. A corresponding tray receiving compartment () has a front lip () over which the tray must pass and upon which the tray will rest when properly disposed within the tray receiving compartment. One or more capacitively-coupled RFID tag reader antennas () are disposed proximal to the front lip. These antennas may be positioned to facilitate reading the capacitively-coupled RFID tag when the tray is properly disposed within the tray receiving compartment.

Radio frequency identification tag based tray and tray receiving method and apparatus

A method and apparatus for predistortion training in an amplifier using predistortion is provided herein. Predistortion takes place by collecting a series of envelope errors and averaging the envelope errors for various amplitude regions. LUT values are modified based on a curve-fit to the average amplitude values for each amplitude region. By utilizing a curve-fitting technique, the pitfalls of modifying individual LUT coefficients is avoided. Particularly, because the errors are collected in relatively broad regions and then averaged, the importance of exact correlation between a measured error and a specific LUT entry is significantly lessened.

Method and apparatus for predistortion training in an amplifier utilizing predistortion

An adaptive predistortion linearization system includes input path digital-to-analog converters (DACs), error path DACs, a digital signal processor, and a radio frequency (RF) combiner. The digital signal processor includes a look-up table storing complex gain coefficient values. The digital signal processor generates an error signal based on the complex input signal and the complex gain coefficients by using a vector decomposition calculation. Feedback from a power amplifier can be provided to a training algorithm for periodically updating the gain coefficient values stored in the look-up table. By performing separate D/A conversions, the error path and input signals can be separately filtered. This separation also permits the error signal to be decoupled from the complex input signal, which facilitates an improvement in the wide-frequency-offset noise performance of the system.

Amplifier predistortion system and method

A voltage (Vo) is added to an envelope function and input into a switching modulator ( ). The output of the switching modulator (V ) is input to a linear regulator ( ) where amplitude compensation of V takes place and is output as V . V is then used to accomplish envelope modulation of a power amplifier ( ). The value chosen for Vo is chosen to be adequate to maintain V (t)>V (t) over all time.

Method and apparatus for power modulating to prevent instances of clipping

A multilayer ceramic device ( ) includes a plurality of dielectric layers ( A-G) separated by ground planes ( ) and includes a plurality transmission line segments ( ) in generally folded configuration for defining a tapered transmission line ( ). The profile of the transmission line may vary and includes such profiles as embodied in the depicted lines ( ).

Multilayered tapered transmission line, device and method for making the same

System ( ) is coupled with power amplifier ( ). Generation component ( ) generates error signal ( ) based at least in part on an input signal ( ) for the system ( ). The error signal ( ) includes a phase component. The input signal ( ) includes an envelope component. Modification component ( ) modifies the phase component of the error signal ( ) in response to the envelope component of the input signal to reduce variation of a phase component of the power amplifier output signal ( ).

Modification of phase component of error signal to reduce variation of phase component of output signal of power amplifier

A method (200) and device (100) provide an efficient linear power amplifier that generates a variable-envelope radio frequency RF signal. The method includes the steps of: A) using an efficient envelope-following unit to output a supply voltage in accordance with a variable envelope of an input baseband signal, wherein using the efficient envelope-following unit includes: 1) using a bandwidth-limiting mapping unit to determine a reference signal based on the baseband signal; and 2) using an envelope-tracking power converter to output a supply voltage, responsive to the reference signal, to the linear RF power amplifier; B) providing an RF input signal with amplitude and phase information to a linear RF power amplifier; and C) using the linear RF power amplifier to output a power-efficient amplified variable-envelope RF signal with substantially a same amplitude and phase information as the RF input signal.

Method, device, phone and base station for providing envelope-following

The present invention provides a linearization system (100) and method (700, 800) for generating a predistorted drive signal for a nonlinear transmission path. The linearization includes: A) an analog feedback system (39), coupled to a computation unit, for determining, during a training mode, a complex error signal that linearizes the nonlinear transmission path and wherein, in an operation mode, the analog feedback system is disabled; and B) a computation unit (1), coupled to the analog feedback system and coupled to receive a complex input signal and the complex error signal, for determining, during the training mode, complex predistortion gain coefficients and, during the operation mode, generating the predistorted drive signal for the nonlinear transmission path, wherein the analog feedback system and computation unit are interconnected by interface circuitry.

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Schaumburg, IL, United States of America

Andrew Merritt Khan