<?xml version="1.0" encoding="UTF-8"?>

<rss version="2.0">
    <channel>
        <image>
            <title>freepatentsonline.com</title>
            <width>141</width>
            <height>131</height>
            <link>http://www.freepatentsonline.com/</link>
            <url>http://www.freepatentsonline.com/images/logo.gif</url>
        </image>
        
        <title>Free Patents Online: Amplifiers</title>
        <link>http://www.freepatentsonline.com/rssfeed/rsspat330.xml</link>
        <description>USPTO Class 330 Amplifiers</description>
        <language>en-us</language>
        <lastBuildDate>Tue, 21 May 2013 08:00:00 EDT</lastBuildDate>
        <item>
            <title><![CDATA[Mode-switching low-noise amplifier and wide-band RF receiver]]></title>
            <link>http://www.freepatentsonline.com/8447259.html</link>
            <description><![CDATA[A mode-switching LNA generally includes an input unit, an output unit and a bias voltage generator. The input unit amplifies an input signal to generate an amplified signal. The output unit receives the amplified signal from the input unit and operates either in an oscillation mode or in an amplification mode in response to a control signal to generate an output signal having a center frequency equal to a target frequency. The control signal indicates whether the center frequency of the output signal is the same as the target frequency. The bias voltage generator provides an input bias voltage to the input unit in response to the control signal, where the input bias voltage includes a first bias voltage in the amplification mode and a second bias voltage in the oscillation mode.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Radio frequency transmitter having an amplifier with power supply modulation]]></title>
            <link>http://www.freepatentsonline.com/8447245.html</link>
            <description><![CDATA[A circuit including a carrier amplifier having an input, an output, a first transistor coupled to a first power supply voltage terminal for receiving a modulated power supply voltage, and a second transistor coupled to a second power supply voltage terminal for receiving a fixed power supply voltage is provided. The circuit further includes a peaking amplifier having an input coupled to the input of the carrier amplifier and an output coupled to the output of the carrier amplifier.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Thermal feedback for switch mode amplification]]></title>
            <link>http://www.freepatentsonline.com/8447050.html</link>
            <description><![CDATA[A thermal sensor at the output of a switching amplifier senses heat dissipation at the output switch. If an overheating condition is sensed, gain of the digital input signal is lowered to reduce output power of the audio output signal.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Circuit with three-stage of power-on sequence used for suppressing the pop noise in audio system]]></title>
            <link>http://www.freepatentsonline.com/8447046.html</link>
            <description><![CDATA[The present invention discloses a circuit with three-stage of power-on sequence used for suppressing the pop noise in audio system. It mainly comprises a first resistor (R1); a capacitor (Cout); a first switch (SW1); a second switch (SW2); a soft start device; a first feedback amplifier; and a second feedback amplifier. By using the three-stage of power-on sequence, the present invention can effectively suppress the pop noise when the audio driver is power on.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Adaptive receive-side equalization]]></title>
            <link>http://www.freepatentsonline.com/8446940.html</link>
            <description><![CDATA[An adaptive receiver equalizes incoming data expressed as a series of symbols, the degree of equalization being adjusted by some adaptive control logic. An amplitude detector samples the amplitude of the eye openings of incoming symbols and conveys the resulting measures of eye amplitude to the adaptive control logic. The control logic experiments with different equalization settings while monitoring the resulting eye amplitude to find the equalization setting that provides incoming data eyes of the highest amplitude. A data filter may be included to enable the amplitude detector only in response to particular incoming data patterns.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Oscillator circuit]]></title>
            <link>http://www.freepatentsonline.com/8446228.html</link>
            <description><![CDATA[An oscillator circuit comprises a push-push oscillator and a differential output, comprising a first and a second output circuit. The push-push oscillator has a first and a second branch. Each of the first and second branch comprises an own voltage divider branch of a common bridge circuit. Each of the first and second voltage divider branches comprises an own pair of micro-strip lines connected in series. Each of the first and second voltage divider branches has an own tap. Both taps are connected to each other by at least one of a first capacity and a micro-strip line. The differential output comprises a first and a second output terminal. The first output terminal is connected via the first output circuit to a first node. The second output terminal is connected via the second output circuit to a second node. Each of the first and second nodes of the push-push oscillator is a common node of both of the first and the second branches.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Electronic circuit with a linear amplifier assisted by a switch-mode amplifier]]></title>
            <link>http://www.freepatentsonline.com/8446221.html</link>
            <description><![CDATA[An electronic circuit includes a linear amplifier unit having a first current feedback loop, assisted by a switched-mode amplification unit having a second current feedback loop. The inputs of the two units are connected so that they receive, at the same time, a current setpoint in an operating mode in order to generate a fixed current across a load connected to the output of the units. The first feedback loop includes a first sensor to measure the current in the load, a first subtractor element to subtract the first measured current from the current setpoint, a first controller connected to the output of the first subtractor element and controlling a linear amplifier, which supplies the first output current to the load. The second feedback loop includes a second current sensor to measure a second current supplied to the load, between a connecting node of two switches connected in series to a supply voltage source and an inductor whose output is connected to the load. The second loop further includes a second subtractor element to subtract the second measured current from the current setpoint, a second controller connected to the output of the second subtractor element and controlling a pulse-width modulator that controls the activation of the switches to alternately connect the inductor either to the high potential or to the low potential of the supply voltage source.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Method and apparatus for increasing the effective resolution of a sensor]]></title>
            <link>http://www.freepatentsonline.com/8446220.html</link>
            <description><![CDATA[Methods and devices for increasing a sensor resolution are disclosed. In one example, a two measurement process is used. A first measurement is used to effectively measure across a full range (e.g. 0 to 5 VDC) of the sensor. This first measurement may identify the current operating point of the sensor (e.g. 3.5 VDC). A second measurement may then be made to effectively measure across a sub-range of the sensor that encompasses the current operating point of the sensor (e.g. across a sub-range of 3.0 to 4.0 VDC for a current operating point of 3.5 VDC). The gain of the amplifier may be raised during the second measurement to produce a higher resolution measurement. In some cases, the first measurement may be used to determine an appropriate offset that may be applied so as to scale the amplifier to the desired sub-range of sensor that includes the current operating point of the sensor. In some cases, the two measurements may be used together to compute an effectively higher resolution measurement signal. In some cases, this may allow for a smaller and/or cheaper sensor to be used, while still achieving good results.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Class-G line driver control signal]]></title>
            <link>http://www.freepatentsonline.com/8446219.html</link>
            <description><![CDATA[An apparatus comprising an input, a control signal generator coupled to the input and having a control signal generator output, and an amplifier coupled to the control signal generator output, wherein a voltage supplied to the amplifier is switched based on the control signal generator output, and wherein the control signal generator output is based on a data signal in the input. Also included is an apparatus comprising circuitry configured to implement a method comprising detecting an incoming signal, calculating a derivative of the incoming signal, estimating a future incoming signal based on the derivative of the incoming signal and a time step, and providing the estimated future incoming signal to switch between a first supply voltage and a second supply voltage prior to or concurrent with an arrival of the future incoming signal at the switch, wherein the incoming signal and the future incoming signal are analog signals.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Power amplifier and transmitter]]></title>
            <link>http://www.freepatentsonline.com/8446218.html</link>
            <description><![CDATA[A power amplifier is provided, which includes a power dividing unit, a first power amplification tributary, a second power amplification tributary, and an impedance conversion unit. Input ends of the first power amplification tributary and the second power amplification tributary are coupled to two output ends of the power dividing unit respectively. An output end of the first power amplification tributary is coupled to an output end of the second power amplification tributary through the impedance conversion unit. Rated power of a peak power amplifier in the second power amplification tributary is greater than that of a main power amplifier in the first power amplification tributary. The beneficial effects of the present invention lie in that larger back-off exists at the peak of an efficiency curve of the power amplifier, and in the case that power is back-off, efficiency of the power amplifier is improved.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Dual-loop feedback amplifying circuit]]></title>
            <link>http://www.freepatentsonline.com/8446217.html</link>
            <description><![CDATA[An amplifying circuit arranged for converting an input signal into an amplified output signal comprising: an input node (11) at an input side of said circuit for receiving said input signal (pi); an output node (9) at an output side of said circuit for outputting said amplified output signal (io); a first gain element (M1) connected between said input and output nodes and provided for converting an input voltage taken from said input signal into a current for forming said amplified output signal; a negative feedback loop (3) over said first gain element, said negative feedback loop having first elements (5, 6) arranged for providing input matching; and a positive feedback loop (2) over said first gain element, said positive feedback loop having second elements (7, 8) arranged for providing additional input matching and gain enhancement of said first gain element.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Anti-pop circuit]]></title>
            <link>http://www.freepatentsonline.com/8446216.html</link>
            <description><![CDATA[Presently many audio chips suffer from pop issues, which is especially serious for single ended audio drivers. An audio pop is a disturbance in the output caused by a sudden transition of chip power, particularly when a chip is powered on or powered off. Furthermore, compensation networks included in the amplifiers on audio chips for stability offer a significant path for transmitting power disturbances to the output. Hence, circuitry is developed to suppress pops in the output stages of an amplifier.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Mixer circuit and method for adjusting common voltage of mixer circuit]]></title>
            <link>http://www.freepatentsonline.com/8446205.html</link>
            <description><![CDATA[A mixer circuit includes: a mixer circuit including a first transistor pair to output a first differential input signal and a second transistor pair to output a second differential input signal by inversing the first differential signal; a local signal supply circuit to supply a pair of local signals to gates of the first transistor pair and the second transistor pair; an operational amplifier including an input pair coupled to an output pair of the mixer circuit and an output pair coupled to the input pair via feedback resistors, the operational amplifier to amplify the first differential input signal and output a differential output signal; a common mode feedback circuit to control a center voltage of the differential output signal so that the center voltage maintains a common voltage; and a common voltage generator circuit to generate the common voltage according to an amplitude of the local signal.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
        <item>
            <title><![CDATA[Optical communication device]]></title>
            <link>http://www.freepatentsonline.com/8445832.html</link>
            <description><![CDATA[An optical communication device which can be operated at high speed is provided. For example, the optical communication device includes: a pre-amplifier circuit PREAMP1 amplifying a current signal Iin from a photodiode PD, and converting an amplified signal into a voltage signal; and an operating-point controller circuit VTCTL1 controlling an operation of the PREAMP1. The PREAMP1 includes a negative feedback path formed by a feedback resistance Rf1, and includes: a level-shift circuit LS1 level-shifting in accordance with an operating-point control signal Vcon; and an amplifier circuit AMP1 connected to a subsequent stage of the LS1 and performing an amplifying operation with a high gain. The VTCTL1 includes a replica circuit configured by the same circuit and circuit parameter as those of the AMP1 and electrically connected between the input and the output, and generates the Vcon so that an output DC level of this replica circuit is matched with an input DC level of the AMP1.]]></description>
            <pubDate>Tue, 21 May 2013 08:00:00 EDT</pubDate>
        </item>
    </channel>
</rss>