Class / Patent application number | Description | Number of patent applications / Date published |
330096000 | Combined with control of bias voltage of signal amplifier | 6 |
20100045371 | AMPLIFICATION CONTROL DEVICE, TEST SIGNAL GENERATION MODULE, TEST DEVICE, AMPLIFICATION CONTROL METHOD, PROGRAM, AND RECORDING MEDIUM - An amplification control device for controlling a variable-gain amplifier the amplification factor of which is controlled based on an analog control signal, and which amplifies an analog input signal and outputs an analog output signal, includes component acquisition means that transforms, by the discrete Fourier transform, a digital output signal converted from the analog output signal into digital form by an A/D converter, thereby acquiring a desired frequency component of the digital output signal, differentiating means that acquires a difference between the electric power of the frequency component acquired by the component acquisition means and a target value of the electric power of the frequency component, and digital control signal output means that outputs a digital control signal, based on the difference acquired by the differentiating means, for controlling the amplification factor of the variable-gain amplifier, in which the analog control signal is obtained by converting the digital control signal into analog form by the D/A converter. | 02-25-2010 |
20110032030 | SYSTEMS AND METHODS FOR SATURATION DETECTION AND CORECTION IN A POWER CONTROL LOOP - Systems and methods are described for detecting and correcting saturation in a power amplification circuit. An exemplary circuit comprises a power amplifier that provides an amplified output signal based upon an input signal and a gain control signal; a power detector that provides a detector signal indicative of the amplified signal magnitude; an error amplifier that generates the gain control signal based upon a setpoint signal and the detector signal; and a saturation detector that provides a saturation detection signal indicating whether gain control signal exceeds a reference signal. In another embodiment the circuit comprises an offset generator that provides a correction to the setpoint signal in response to the saturation detection signal indicating that the gain control signal exceeds the reference signal. In still another embodiment the circuit includes an offset cutoff circuit that freezes the correction to the setpoint signal in response to the correction exceeding a threshold. | 02-10-2011 |
20110084760 | HIGHLY EFFICIENT CLASS-G AMPLIFIER AND CONTROL METHOD THEREOF - A highly efficient class-G amplifier includes an amplifier circuit coupled between a positive power rail and a negative power rail to amplify an audio input signal of the class-G amplifier, and a boost inverting power converter to convert a supply voltage to a positive rail voltage and a negative rail voltage on the positive and negative power rails. The boost inverting power converter includes a boost inverting power stage coupled to the positive and negative power rails, and a controller to switch the boost inverting power stage between a boost mode and an inverting mode. An audio level detector detects the audio input signal for the controller to adjust the positive and negative rail voltages. The class-G amplifier has higher efficiency and requires lower cost because it does not need a charge pump. | 04-14-2011 |
20120013399 | AUTOMATIC GAIN CONTROL CIRCUIT AND AUTOMATIC GAIN CONTROL METHOD - An automatic gain control method includes receiving a sequence of multiple digital data, and calculating a plurality of signal values corresponding to the respective voltage values of the digital data, such as multiple peak-to-peak voltage values or power values, so as to optimize a gain according to variations in the output values. The gain optimization includes updating a reference value according to the signal values. If the reference value is less than a minimum threshold, the gain is increased to cause the reference value to reach the minimum threshold. The gain optimization also includes analyzing a clipping rate according to the signal values. If the clipping rate is equal to zero, then the gain is adjusted up. If the clipping rate is greater than zero, then the gain is adjusted down, such that the clipping rate is decreased to approach to zero. | 01-19-2012 |
20130033314 | POWER BASED FEEDBACK FOR IMPROVED POWER AMPLIFIER (PA) EFFICIENCY - A power train amplification stage is described. The power train amplification stage includes a power amplifier. The power train amplification stage also includes a switched mode power supply that provides a bias voltage to the power amplifier. The power train amplification stage further includes a pulse density modulator. The power train amplification stage also includes a feedback path from the power amplifier to the pulse density modulator. | 02-07-2013 |
20160254787 | WIDEBAND HIGHLY LINEAR AMPLIFIER | 09-01-2016 |