Motorola Corporation

Google Inc.

David H Minasi

Gustavo Dario Leizerovich

Richard B Meador

Peter J Yeh

Alejandro Candal

Alessandro Perrotta

Ronald H Deck

John P Chenoweth

Quang C Le

Armin Werner Klomsdorf

Gregory Redmond Black

Paul H Gailus

Julio C Castaneda

Kazimierz Siwiak

Michael H Baker

Wayne W Ballantyne

Lorenzo A Ponce De Leon

Roger A Davenport

David H Karl

Kok Huat Chong

Aaron L Dietrich

Koon Keong Shee

Robert S Trocke

David J Graham

John Janos Bozeki

Stephen O Bozzone

Joshua E Dorevitch

Jan-Ove U Mattsson

Geroncio O Tan

Gustavo V Leizerovich

Charles H Matsumoto

Stephen J Hutchison

Michael R Bishop

Roger D Gamble

Paloma I Lampert

Suresh K Ramasamy

Brian Shelton

A method and system performs antenna tuning using detected changes in antenna self-capacitance in a wireless communication device. A modem detects changes in antenna self-capacitance by utilizing multiple antenna elements. The modem determines a current antenna loading condition using the detected changes in antenna self-capacitance. The modem determines appropriate tuning states for each antenna matching and tuning circuit (AMTC) associated with a respective antenna element. In order to determine the appropriate tuning states, the modem utilizes pre-established antenna self-capacitance information which is mapped to antenna tuning states. The antenna tuning states which are respectively mapped to pre-established antenna self-capacitance are empirically pre-determined by correlating antenna self-capacitance changes to antenna impedance changes. The modem is thus able to change the tuning states of multiple tunable matching circuits and perform antenna tuning using (a) detected real-time changes in antenna self-capacitance and (b) pre-established mappings of antenna self-capacitance and antenna tuning states.

Method and wireless communication device for using an antenna as a sensor device in guiding selection of optimized tuning networks

A method and system performs antenna tuning which enhances radio frequency (RF) tuner reliability within a wireless communication device (WCD). The WCD, in response to receiving a request to change an active RF tuning state, retrieves component usage data corresponding to components of a tuning circuit that is tunable to an RF operating channel. The WCD selectively determines, using device environment state data and/or RF state data and the component usage data, an RF tuning state tuned to the RF operating channel. The selected RF tuning state (a) satisfies tuning performance specifications and (b) enhances component reliability performance by minimizing an operational wear on tuning circuit components. The WCD configures the tuning circuit using the selected RF tuning state and tracks session parameter values for tuning circuit components during a corresponding communication session. Following completion of the communication session, the WCD uses the tracked session parameter values to update component usage data.

Method and system to improve antenna tuner reliability

A multiband element antenna () used in combination with a unique metal chassis design that enhances antenna performance and that enables the design of a compact and efficient antenna system. A cellular flip phone () that has a conductive chassis includes a flip up antenna () that pivots between an extended and a retracted position. The antenna () pivots at a point that is located on one edge of the top of the cell phone body (). The conductive chassis of the flip cover () is grounded to the flip phone body () at a single point or single surface that is substantially opposite the antenna RF feed (). Conductive surfaces of the cellular flip phone body () are grounded at a single point that is near the antenna RF feed point (). This grounding arrangement has been found to control the flow of induced currents on the conductive portions of the flip cover () and body (), thereby improving the performance of the device's antenna ().

Antenna structure for devices with conductive chassis

An antenna structure () that includes a Planar Inverted-F Antenna (PIFA) () and an extendable portion such as a whip element (). The PIFA () operates normally when the extendable portion () is retracted and upon extension, an electrical contact is made between the extendable portion () and the end () of the PIFA () that is electrically opposite, i.e., furthest along the electrically conductive path of the PIFA, from the feed structure () for the PIFA (). The electrical length of the composite antenna () is then substantially equal to the sum of the electrical length of the PIFA () and extendable portion (). An embodiment disconnects the ground path of the PIFA feed structure upon extension of the extendable portion () to provide constant input impedance.

Planar inverted-F antenna with extendable portion

A wireless communications device () includes a flip assemblythat includes a speaker () and that has a GPS antenna () mounted about a far edge. The flip assembly () further has a GPS RF amplifier () mounted adjacent to the GPS antenna () for amplifying signals received by the GPS antenna () and providing those amplified signals to a GPS RF stripline (). The GPS RF stripline () includes a flexible RF stripline () to accommodate rotationally opening and closing of the flip assembly (). Positioning of the GPS antenna () about the far edge of the flip assembly () removes the GPS antenna from a main housing assembly () of the wireless communications device () and provides for better GPS signal reception performance.

Extended antenna support for a wireless communications device

A transmitter ( ) includes a fractional N synthesizer, a baseband digital modulation stage coupled to the fractional N synthesizer in a first modulation mode, and a baseband I/Q modulation stage also coupled to the fractional N synthesizer and reusing the fractional N synthesizer in a second modulation mode. A method ( ) of operating a transmitter includes transmitting a first signal from a transmitter using the fractional N synthesizer and the baseband digital modulation stage to modulate the first signal according to a first wireless protocol. The method ( ) also includes transmitting a second signal from the transmitter using the baseband I/Q modulation stage and the fractional N synthesizer to modulate the second signal according to a second wireless protocol.

Transmit modulation circuit and method of operating a transmitter

An isolator eliminator for a linear transmitter receives a plurality of digital samples of an information signal and a drive signal sampled from a feedback loop at periodic time intervals and, responsive to processing the digital samples, provides high accuracy phase and level correction signals to the feedback loop. The phase and level correction signals maintain stable, linear operation of the feedback loop and limit splatter. In a preferred embodiment, the isolator eliminator includes a digital signal processor such that multiple communication protocols may be accommodated by changing software code executed by the processor.

Isolator eliminator for a linear transmitter

A frequency generation circuit includes an oscillator ( ), a comparator ( ) coupled to the oscillator, a first divider ( ) coupled to the comparator, a PLL ( ) coupled to the first divider, a second divider ( ) coupled to the PLL, a first multiplexor ( ) coupled to the second divider, a third divider ( ) coupled to the comparator and the first multiplexor, a second multiplexor ( ) coupled to the comparator and the reference clock PLL, a fourth divider ( ) coupled to the second multiplexor, a fifth divider ( ) coupled to the comparator, and a seventh divider ( ) coupled to the comparator. A method of operating a transceiver includes using the frequency generation circuit to provide a first clock signal, a second clock signal, a first reference frequency, and a second reference frequency for a first component, a second component, a third component, and a fourth component, respectively, of the transceiver.

Frequency generation circuit and method of operating a tranceiver

A phase lock loop (,) includes a dual-state charge pump (,) having a first current source (,), a second current source (,) coupled in series to the first current source, a third current source (,), a fourth current source (,) coupled in series to the third current source, and control circuitry (,) coupled to the first, second, third, and fourth current sources. The charge pump can be programmed to be in an adapt mode with large up and down currents or in a normal mode with small up and down currents. The duration of the adapt mode can be programmed by a timer. The phase lock loop has a wide loop bandwidth and a faster lock time during the adapt mode and a narrow loop bandwidth and less phase noise during the normal mode.

Phase lock loop with dual state charge pump and method of operating the same

The RF section of a communication device (,) includes a receiver (,), a transmitter (,), first injection frequency generation circuit (,), and an intermediate frequency (IF) generation circuit (,). The IF generation circuit has a shared output coupled to both the receiver and transmitter, as well as a control circuit (,) for feedback control purposes. The IF generation circuit is used to generate IF for both the receiver and transmitter, thus using fewer components that two separate IF generation circuits. It includes two differently tuned voltage controlled oscillators (,) which are selectively and exclusively powered by first and second power switches (,), respectively. The control circuit provides a single control voltage corresponding to a desired frequency pair to both VCOs at a common control input, then selects the appropriate VCO depending on whether the communication device is receiving or transmitting.

Band switchable injection oscillator and communication device using same

A transmitter has a loop switch (132) and a feedback switch (127), which are operated by a control circuit (134). An unamplified value is obtained by connecting a cartesian demodulator (126) with the input to a power amplifier (118), applying a fixed baseband signal level to the input of the cartesian modulator, and measuring the output level of the cartesian demodulator. An amplified value is obtained by connecting the output of the power amplifier to the cartesian demodulator, again applying a fixed baseband signal level, and measuring the output of the demodulator. The amplified and unamplified values are compared by the control circuit, and the power amplifier gain is adjusted by varying the gain adjust signal (138), if necessary.

Apparatus and method for tuning the gain of a transmitter utilizing

An antenna coupling assembly (100) includes an stub section (107) for coupling radio frequency (RF) energy from an RF source to a radio antenna. An antenna coupler ground (113) is positioned adjacent to the stub section (107) and is electrically connected to the ground of the RF source (101). In accordance with the invention, a ground extension section (115,115',115') is attached to the antenna coupler ground (113) for electrically extending the physical length of the antenna coupler ground to enhance efficiency and overall performance of the antenna coupler.

Radio frequency (RF) antenna coupler with an electrically extended

An active circuit includes an amplifying transistor (102), a voltage reference (208), and an active bias circuit. The active bias circuit controls the operating point of the amplifying transistor, and includes a bias transistor (224) which is controlled by the voltage reference and the collector current of the amplifying transistor. As the temperature of the amplifying transistor changes, the tendency of the collector current to change is counter-acted by the bias transistor and the voltage reference.

Active circuit having a temperature stable bias

A low loss electronic radio frequency (RF) switch (100) for switching RF energy between an antenna port (115), a receiver port (113) and a transmit port (101) used in a two-way radio transceiver. The RF switch includes a first diode (105) connected between the transmit port (101) and the antenna port (115). A first capacitor (103) is connected between the transmit port (101) and a ground potential while an inductor (107) and second capacitor (111) are serially connected between the antenna port (115) and a receive port (113). A second diode (109) is connected between the inductor (107) and the second capacitor (111) and the ground potential. The antenna port (115) is normally connected with the receive port (113) when idle. When direct current is applied to the transmit port (101) the first diode (105) and second diode (109) are biased into a low impedance state connecting the antenna port (115) to the transmit port (101) and isolating the receive port (113) from the antenna port (115).

Low loss electronic radio frequency switch

An antenna coupler (100) for use in a mobile adaptor (102, 300) transfers radio frequency (RF) energy between a portable radio antenna system (204) and an external antenna (124) with minimal coupling losses. The antenna coupler (100) includes a resonator patch (110) and an electromagnetic tuning element (112) forming side walls on a substrate for receiving the portable antenna system (204). The electromagnetic tuning element (112) controls the impedance between the resonator patch (110) and the portable antenna system (204) while the resonator patch transfers the RF energy between the portable radio antenna and the external antenna (124).

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Plantation, FL, United States of America

David H Minasi