Patent application number | Description | Published |
20080315956 | Saturation Handling - Saturation handling for preventing a power amplifier from going into a saturation condition is disclosed. | 12-25-2008 |
20090088100 | Method and Apparatus for Regulating a Power Amplifier - A method for regulating a power amplifier for operation in a timeslot data transmission system comprises providing the power amplifier with a bias for setting an operating point for the power amplifier, wherein the bias has a respective bias value. In addition, a supply voltage control signal is provided, wherein a supply voltage value is set such that a prescribed output power value of the power amplifier is attained. The bias value is changed to a new bias value. These steps are repeated until a prescribed criterion is met, but for at least one subsequent timeslot. Next the bias value of the subsequent timeslot is set to the bias value of the previous timeslot. | 04-02-2009 |
20090128233 | SHARED LINEARITY MAINTENANCE IN POWER AMPLIFIERS - In some embodiments, a circuit includes a power amplifier including an input terminal configured to receive an input signal and an output terminal to provide an RF voltage, the output terminal coupled to a load, a current sensor configured to sense the current drawn by the power amplifier and provide a first sensor output signal dependent upon current consumption when the current exceeds a predetermined current threshold, a voltage sensor configured to sense the output power of the power amplifier and provide a second sensor output signal when the RF voltage during up ramp falls below a predetermined threshold voltage, and a summing circuit configured to receive the first and second sensor output signals and provide a feedback signal including a combination of a power dependent contribution and either of a voltage dependent contribution or a current dependent contribution. | 05-21-2009 |
20090163155 | METHODS FOR CALIBRATING A TRANSMITTER, AND RADIO TRANSMITTER - In an embodiment, a radio transmitter may be provided. The radio transmitter may include a radio transmitter control loop; and a controller configured in such a way that it operates the radio transmitter control loop as a closed control loop in a first operating mode, and that it operates the radio transmitter control loop as an open control loop in a second operating mode. | 06-25-2009 |
20090280755 | RADIO FREQUENCY COMMUNICATION DEVICES AND METHODS - One embodiment relates to a radio frequency (RF) communication device. The RF communication device includes a coupler having a plurality of ports and an adjustable termination coupled to one of the plurality of ports. The adjustable termination is adjustable based on an operating condition of the RF communication device. Other methods and systems are also disclosed. | 11-12-2009 |
20100079209 | SETTING AN OUTPUT LEVEL OF AN AMPLIFIER APPARATUS - An amplifier module comprises an amplifier with an output and a coupling element for receiving a signal at the output. It also comprises a control input for receiving a control signal and a power detector which can be changed over and is intended to determine a power signal from the signal. The power detector which can be changed over is coupled to the control input and is set up in such a manner that a dynamic range of the power detector can be changed on the basis of the control signal. | 04-01-2010 |
20120064849 | PA Bias Optimization for Modulation Schemes with Variable Bandwidth - One embodiment of the present invention relates to a method for improving the power consumption of a transmission chain by varying the operating point of a power amplifier to optimize (e.g., reduce) the current that is consumed by the amplifier. The operating point is varied by changing the bias voltage(s) (e.g., supply voltage, quiescent voltage) of the amplifier to a predetermined value that is chosen based upon the effect that a given transmitted signal modulation scheme characteristic (e.g., channel bandwidth and/or number of subcarriers) has on the operating point of a power amplifier. For example, if the characteristics indicate a good power amplifier performance the linear output power capability of a power amplifier can be lowered, by changing the bias voltage(s) supplied to the power amplifier, to reduce the output power capability and current consumption of the power amplifier. | 03-15-2012 |
20120249236 | Amplifier Circuit, Mobile Communication Device and Method for Adjusting a Bias of a Power Amplifier - An amplifier circuit includes a power amplifier configured to amplify an RF input signal to obtain an RF output signal, and a bias controller configured to control a bias of the power amplifier. The bias controller is configured to determine a measure of a load impedance of a load coupled to an output of the power amplifier and provide a bias control signal to adjust the bias of the power amplifier based on the determination of the measure of the load impedance. | 10-04-2012 |
20120250534 | Calibration of a Transmitter with Internal Power Measurement - A method for calibrating a transmitter includes operating the transmitter using a first transmitter setting; obtaining, via an external reference measuring device, a transmit power reference value indicative of a first transmit power of the transmitter corresponding to the first transmitter setting, and obtaining, using an internal measuring device of the transmitter or of a receiver associated with the transmitter, a first uncalibrated transmit power measurement value corresponding to the first transmit power. The method further includes calibrating the internal measuring device using the transmit power reference value and the first uncalibrated transmit power measurement value to provide a calibrated internal measuring device, operating the transmitter using a second transmitter setting, and obtaining, using the calibrated internal measuring device, a second transmit power measurement value indicative of a second transmit power corresponding to the second transmitter setting. Lastly, the method includes obtaining self-calibration data based on the second transmitter setting and the second transmit power measurement value, and storing the self-calibration data in a calibration data structure. | 10-04-2012 |
20120276862 | METHODS FOR CALIBRATING A TRANSMITTER, AND RADIO TRANSMITTER - In an embodiment, a radio transmitter may be provided. The radio transmitter may include a radio transmitter control loop; and a controller configured in such a way that it operates the radio transmitter control loop as a closed control loop in a first operating mode, and that it operates the radio transmitter control loop as an open control loop in a second operating mode. | 11-01-2012 |
20130027129 | TRANSMIT CIRCUIT, METHOD FOR ADJUSTING A BIAS OF A POWER AMPLIFIER AND METHOD FOR ADAPTING THE PROVISION OF A BIAS INFORMATION - A transmit circuit includes a power amplifier configured to amplify an RF input signal to obtain an RF output signal, and an antenna tuner configured to transform an antenna impedance to an impedance at an input of the antenna tuner, wherein the input of the antenna tuner is coupled to an output of the power amplifier. The transmit circuit further includes a bias controller configured to control a bias of the power amplifier, wherein the bias controller is configured to provide a bias control signal to adjust the bias of the power amplifier based on a determination of a measure of a load impedance provided to the power amplifier by the antenna tuner. | 01-31-2013 |
20130273979 | DC POWER CONTROL FOR POWER AMPLIFIERS - Some embodiments of the present disclosure relate to transmission techniques that result in power savings relative to previous solutions. These techniques often transmit a signal-of-interest by using two paths, namely, a transmission path (which includes a power amplifier) and a control path. The signal-of-interest is evaluated in “fast-track” fashion on the control path, such that the control path can “tune” a DC supply signal provided to the power amplifier. Thus, when a delayed version of the signal-of-interest is provided over the transmission path to the power amplifier, the DC supply signal provided to the power amplifier helps ensure that the power amplifier has “just enough” DC supply to ensure reliable operation without dissipating excess power. In this way, the techniques disclosed herein help to reduce power consumption in transmitters, thereby potentially helping to extend battery life and reduce undesired heating for users. | 10-17-2013 |
20140162578 | PA BIAS OPTIMIZATION FOR MODULATION SCHEMES WITH VARIABLE BANDWIDTH - The disclosure relates to a method for improving the power consumption of a transmission chain by varying the operating point of a power amplifier to optimize (e.g., reduce) the current that is consumed by the amplifier. The operating point is varied by changing the bias voltage(s) (e.g., supply voltage, quiescent voltage) of the amplifier to a predetermined value that is chosen based upon the effect that a given transmitted signal modulation scheme characteristic (e.g., channel bandwidth and/or number of subcarriers) has on the operating point of a power amplifier. | 06-12-2014 |
20140248844 | TRANSMIT CIRCUIT, METHOD FOR ADJUSTING A BIAS OF A POWER AMPLIFIER AND METHOD FOR ADAPTING THE PROVISION OF A BIAS INFORMATION - A transmit circuit includes an envelope tracker configured to determine an envelope of a transmit signal and provide bias information based on the determined envelope of the transmit signal. The transmit circuit further includes a power amplifier configured to generate an RF output signal based on the transmit signal, a bias provider configured to provide a bias for the power amplifier based on the bias information, and an impedance determinator configured to determine a measure of a load impedance of a load coupled to an output of the power amplifier. The envelope tracker is configured to adapt the bias information based on the measure of the load impedance. | 09-04-2014 |