Class / Patent application number | Description | Number of patent applications / Date published |
455249100 | Variable attenuator type | 9 |
20080280578 | Receiver circuit and amplifier circuit - A receiver circuit includes an attenuator that receives a received signal and attenuates the received signal, a DC level shifter that shifts a DC level of an attenuated signal from the attenuator, an amplifier section that has frequency characteristics of a band-pass filter and amplifies a signal from the DC level shifter that has been shifted with respect to the DC level, and a control circuit that controls an attenuation of the attenuator based on a signal output from the amplifier section. The control circuit controls the attenuation of the attenuator by changing filter characteristics of the attenuator corresponding to an amplitude of the signal output from the amplifier section so that the signal output from the amplifier section has a constant amplitude even when an amplitude of the received signal has changed. | 11-13-2008 |
20090124227 | AUTOMATIC GAIN CONTROL CIRCUIT - A first signal path including a first LNA | 05-14-2009 |
20090143036 | LINEAR VOLTAGE CONTROLLED VARIABLE ATTENUATOR WITH LINEAR DB/V GAIN SLOPE - A variable attenuator and method of attenuating a signal is presented. The variable attenuator contains an input that receives an input signal to be attenuated. A voltage divider between a resistor and parallel MOSFETs provides the attenuated input signal. The MOSFETs have different sizes and have gates that are connected to a control signal through different resistances such that the larger the MOSFET, the larger the resistance. The control signal is dependent on the output of the attenuator. The arrangement extends the linearity of the attenuation over a wide voltage range of the control signal and decreases the intermodulation distortion of the attenuator. | 06-04-2009 |
20120231753 | WIDE-BAND MULTI STAGE DOHERTY POWER AMPLIFIER - A multi-stage Doherty power amplifier (“PA”) circuit which achieves superior efficiency over broadband range of frequencies is disclosed. Conventional multi-stage amplifiers may offer potential for efficiency enhancement but may suffer from cost penalties and severe bandwidth limitation in practice. Embodiments may employ a driver in the peaking arm which is biased in class C which may alleviate such limitations. The amplifier topology and associated circuitry described in embodiments may achieve high efficiency, smooth PA gain, and enhanced phase characteristics over a 15% fractional bandwidth with reduced costs. | 09-13-2012 |
20130225108 | Electronic Circuit Arrangement for Receiving Low Frequency Electro-Magnetic Waves with an Adjustable Attenuator Element - An electronic circuit arrangement for receiving low-frequency electromagnetic waves is proposed, having an inductor (L) acting as an antenna for generating a received signal, having a first receiver ( | 08-29-2013 |
20150011171 | Electronic circuit arrangement for receiving low frequency electromagnetic waves with an adjustable attenuator element - An electronic circuit arrangement for receiving low-frequency electromagnetic waves is proposed, having an inductor (L) acting as an antenna for generating a received signal, having a first receiver ( | 01-08-2015 |
20160006497 | ELECTRONIC CIRCUIT ARRANGEMENT FOR RECEIVING LOW FREQUENCY ELECTRO-MAGNETIC WAVES WITH AN ADJUSTABLE ATTENUATOR ELEMENT - An electronic circuit arrangement for receiving low-frequency electromagnetic waves is proposed, having an inductor (L) acting as an antenna for generating a received signal, having a first receiver ( | 01-07-2016 |
20160087660 | METHOD AND SYSTEM FOR EXTENDING DYNAMIC RANGE OF RECEIVER BY COMPENSATING FOR NON-LINEAR DISTORTION - A method is provided for extending dynamic range of a receiver. The method includes receiving a known input signal at the receiver, detecting a first output signal in response to the known input signal, and determining a correction function based on the first output signal and the known input signal for compensating for non-linear distortion introduced by the receiver. The method further includes receiving an unknown input signal at the receiver, detecting a second output signal in response to the unknown input signal, and applying the correction function to the second output signal in a time domain to recover the unknown input signal. | 03-24-2016 |
20160134312 | HIGH-VOLTAGE RADIO-FREQUENCY ATTENUATOR - A variable attenuator can be used with high-voltage radio-frequency signals. The attenuator can provide wide dynamic range with little loss at the lowest attenuation level. The attenuator may be implemented in digital integrated circuit processes and occupies small integrated circuit area. Additionally, the use of circuit elements external to the SoC may be reduced. The attenuator uses multiple attenuator cells connected in parallel to an RF input and RF output. The attenuator cells use capacitive dividers with pair of capacitors laid out in the same integrated circuit area. The capacitors are also laid out so that the RF input shields the RF output from ground to avoid parasitic capacitance on the RF output. | 05-12-2016 |