| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 330199000 | WITH POWER OR BIAS VOLTAGE SUPPLY | 15 |
| 20090128236 | High Efficiency Amplification - A radio frequency amplification stage comprising: an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, comprising: means for providing a reference signal representing the envelope of the input signal; means for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and means for generating an adjusted selected power supply voltage, comprising an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage. | 05-21-2009 |
| 20090295475 | TRANSFORMER-CAPACITOR ENHANCEMENT CIRCUITRY FOR POWER AMPLIFIERS - Circuitry for providing improved pulse-type enhancement of the voltage supplied to a power amplifier ( | 12-03-2009 |
| 20090302941 | Joint optimisation of supply and bias modulation - A radio frequency amplifier system is disclosed in which the amplifier bias supply and power supply voltages are >instantaneously modulated with signals derived from the envelope voltage of the input signal. Separate non-linear mapping functions are used to derive the supply and bias voltages. The two mapping functions are optimised jointly to achieve particular system performance goals, such as optimum efficiency, constant gain, constant phase, or minimum spectral spreading. An optimisation of >particular interest is that which achieves best RF amplifier power added efficiency subject to achieving constant amplifier gain. In this way the need for pre-distortion linearization may be reduced or eliminated. | 12-10-2009 |
| 20100060358 | Compensating for variations in the response of a power supply - Apparatus includes an equalizer having a signal input, a control input and an output; a controllable power supply having a control input and an output, the input of the controllable power supply being coupled to the output of the equalizer; a power amplifier having a main signal input, a power supply input, and an output, the power supply input being coupled to the output of the controllable power supply; and a controller having first and second inputs and an output, the first input being coupled directly or indirectly to the output of the controllable power supply, the second input being coupled to a node upstream of the equalizer, and the output being coupled to the control input of the equalizer; the equalizer being configured to apply equalisation to an envelope signal received at its input and to provide a resulting equalized envelope signal at its output, the controllable power supply being configured to provide a power signal at its output based on the equalized envelope signal received at its input, the power amplifier being configured to utilize power received at its power supply input to provide on its output a modulated transmission signal representative of a signal received at the main signal input, and the controller being configured to compare input signals received at its first input to signals received at its second input, and to utilize the results of the comparison to configure the equalizer to correct for variations in the response of the controllable power supply at different frequencies. | 03-11-2010 |
| 20100073088 | Joint optimisation of supply and bias modulation - There is disclosed a technique for controlling at least one amplification stage, comprising: selecting a linearity objective for the amplification stage; in dependence on an input signal to said amplification stage, determining a combination of supply input and bias input for the amplification stage in order to meet said linearity objective; and in dependence on there being more than one combination of supply input and bias input for meeting the linearity objective, selecting the combination that optimises a further system performance objective for the amplification stage. The further system performance objective may be one or more of: an efficiency objective; an envelope signal bandwidth objective; or a robustness to production tolerance objective. | 03-25-2010 |
| 20100102879 | METHOD AND APPARATUS FOR AUTOMATICALLY CONTROLLING AN XNN.RTM. ENHANCEMENT CIRCUITRY FEEDING A POWER AMPLIFIER - Method and apparatus for automatically controlling the operation of a DC power enhancement circuitry connected to an RF power amplifier (PA) that operates at various input signal levels, according to which the instantaneous magnitude of the input signal is sensed and the instantaneous magnitude and its highest (lowest) peak are stored. For the time period during which the peak remains the highest (lowest) peak, the desired dynamic range of the power amplifier is determined according to the peak and a corresponding threshold level and the gain of the enhancement circuitry are determined according for that time period. Whenever the magnitude exceeds the corresponding threshold level, the enhancement circuitry provides to the power amplifier a level of DC power enhancement required for maintaining the output power of the power amplifier within the output dynamic range. Whenever a higher (lower) peak is detected, the process is repeated for the time period during which the lower peak remains the highest (lowest) peak of all preceding peaks and the value of the stored highest (lowest) peak is updated accordingly. | 04-29-2010 |
| 20100148867 | Audio Out Unit - A DC-coupled audio out unit is provided, including at least one regulator and at least one audio amplifier. The regulator is coupled to at least one power terminal of the audio amplifier. | 06-17-2010 |
| 20100244957 | POWER CIRCUITS FOR POWER AMPLIFIERS AND COMMUNICATION SYSTEMS USING THE SAME - A power circuit for a power amplifier which operates in an inactive period and an active period is provided and includes a power supply unit, a current limiting unit, a storage unit, and a converting unit. The power supply unit provides a first current. The current limiting unit is arranged to process the first current to generate a second current. The storage unit is arranged to provide a storage voltage. The storage unit is charged by the second current during the inactive period and discharged by a third current during the active period. The converting unit provides an active power to the power amplifier according to the storage voltage, the second current, and the third current during the active period. | 09-30-2010 |
| 20100289576 | HIGH EFFICIENCY POWER AMPLIFIER POWER ARCHITECTURE - A distributed power converter is for use with an RF power amplifier and includes a primary converter connected to an input voltage and configured to provide a regulated DC intermediate voltage that is galvanically isolated from the input voltage. Additionally, the distributed power converter also includes a secondary regulator connected galvanically to the regulated DC intermediate voltage and configured to generate a regulated DC supply voltage for at least a portion of the RF power amplifier. In another aspect, a method of operating a distributed power converter is for use with an RF power amplifier and includes providing a regulated DC intermediate voltage that is galvanically isolated from an input voltage and generating a regulated DC supply voltage for at least a portion of the RF power amplifier that is galvanically connected to the regulated DC intermediate voltage. | 11-18-2010 |
| 20120105154 | Switching Power Supply - Methods and systems for enhancing system efficiency in a power amplification, modulation, and transmission system are provided. Embodiments include determining output power characteristics of a selected modulation scheme to be employed in data transmission, determining a most probable output power point of operation for the selected modulation scheme based on the output power characteristics, and controlling the output stage power supply of the system to operate at substantially optimal efficiency at the most probable output power point of operation. | 05-03-2012 |
| 20120154042 | ANALOG MULTIPLIER - An exemplary embodiment of an analog multiplier may include a voltage controlled resistance circuit, a first transistor and a second transistor, where the resistance of the voltage controlled resistance circuit is based upon a difference between a supply voltage and a first input voltage and a constant current supply. The current passing through the voltage controlled resistance circuit is based upon a difference between the voltage supply and a second input voltage. The first transistor may be configured to mirror the current passing through the voltage controlled resistance circuit. | 06-21-2012 |
| 20130113560 | POWER AMPLIFYING CIRCUIT AND HIGH-FREQUENCY MODULE - A high-frequency module including a power amplifying circuit includes a high-frequency power amplifying element, a matching circuit, and a driving power-supply circuit. The high-frequency power amplifying element includes a high-frequency amplifying circuit and a directional coupler. A first end of a main line of the directional coupler is connected to an output terminal of a latter-stage amplifying circuit of the high-frequency amplifying circuit. A second end of the main line of the directional coupler is connected through an output matching circuit to a high-frequency signal output terminal of the high-frequency power amplifying element. The output terminal of the latter-stage amplifying circuit is also connected to a second driving power-supply voltage application terminal of the high-frequency power amplifying element. The second driving power-supply voltage application terminal is connected to the high-frequency signal output terminal by a connecting conductor. | 05-09-2013 |
| 20130257532 | POWER CONVERSION CIRCUIT AND ELECTRONIC DEVICE WITH POWER CONVERSION CIRCUIT - A power conversion circuit includes a pulse width modulator, a feedback module, a negative voltage producing module, a voltage regulating module, a path switch, and a rectifier module. The path switch is connected to a power port connected to a power source. The feedback module produces a feedback signal according to the voltage of a positive voltage input port of a power amplifier. The pulse width modulator receives the feedback signal, and outputs a pulse signal with a corresponding duty cycle according to the feedback signal to the path switch, then producing a switching power supply signal; the rectifier module converts the switching power supply signal to a direct current signal with a suitable positive voltage. The negative voltage producing module produces corresponding negative voltage when the path switch is turned on or off. The voltage regulating module regulates the negative voltage to a suitable negative voltage. | 10-03-2013 |
| 330200000 | For plural stage amplifier | 2 |
| 20100237940 | Output Stage with Adaptive Bias Control - An input stage receives a differential input signal at first and second input nodes and provides a differential output current at first and second output nodes. The differential output current includes a component taken from the input nodes through first and second impedances, and an additional component generated in response to a sample of the voltage of the differential input signal. A transconductance cell having cross-coupled inputs may generate the additional component of the output current. | 09-23-2010 |
| 20110050340 | SYSTEM AND METHOD FOR AMPLIFYING A SIGNAL USING MULTIPLE AMPLIFICATION STAGES SHARING A COMMON BIAS CURRENT - An apparatus including cascaded amplification stages adapted to be biased by a common DC current to generate an amplified output signal from an input signal. A first amplification stage includes a routing network to substantially double an input voltage signal, and a first transconductance gain stage to generate a first current signal from the input voltage signal. A second amplification stage includes a resonator to convert the first current signal into a second voltage signal, and a second transconductance gain stage to generate a second current signal from the first current signal. A third amplification stage includes a current gain stage to generate a third current signal from the second current signal, and a load through which the third current signal flows to generate the output signal. | 03-03-2011 |
