Patent application number | Description | Published |
20150200988 | SYSTEMS AND METHODS FOR STREAMING DIGITAL CONTENT USING AN INTERMEDIATE SERVER - Techniques provided herein implement systems and methods that can improve access to content items, from an online content source, by a client device. According to some embodiments, an intermediate content streaming system is implemented on a client device for caching digital content locally at the client device as the content is streamed to the client device from an online content source (e.g., content server) over a network. Additionally, according to some embodiments, a priority-based content downloading system is implemented on a client device to facilitate priority-based pre-downloading of content items to the client device before a user at the client device is presented with access to the content items, such as through a social networking news feed. | 07-16-2015 |
20150201001 | SYSTEMS AND METHODS FOR PRIORITY-BASED DIGITAL CONTENT DOWNLOADING - Techniques provided herein implement systems and methods that can improve access to content items, from an online content source, by a client device. According to some embodiments, an intermediate content streaming system is implemented on a client device for caching digital content locally at the client device as the content is streamed to the client device from an online content source (e.g., content server) over a network. Additionally, according to some embodiments, a priority-based content downloading system is implemented on a client device to facilitate priority-based pre-downloading of content items to the client device before a user at the client device is presented with access to the content items, such as through a social networking news feed. | 07-16-2015 |
Patent application number | Description | Published |
20080227409 | WIRELESS RECEIVER WITH NOTCH FILTER TO REDUCE EFFECTS OF TRANSMIT SIGNAL LEAKAGE - This disclosure describes techniques for reducing adverse effects of TX signal leakage in a full-duplex, wireless communication device. The techniques make use of a notch filter to reject TX signal leakage in a signal processed in the RX path of the wireless communication device. The notch filter may be constructed as a complex notch filter using passive resistor and capacitor components to produce a notch frequency that attenuates TX signal leakage components in a desired signal. The notch filter may be applied to a down-converted, baseband signal produced by a passive mixer. | 09-18-2008 |
20090068963 | COMMON MODE SIGNAL ATTENUATION FOR A DIFFERENTIAL DUPLEXER - Techniques for attenuating undesired signal components from a differential duplexer are described. The duplexer provides a differential received signal at RX+ and RX− ports. This differential received signal includes an undesired common mode signal, which may come from a transmit signal. The common mode signal is attenuated with a common mode trap in an impedance matching network coupled to the RX+ and RX− ports. The matching network includes a first passive circuit coupled between the RX+ port and a first node, a second passive circuit coupled between the RX− port and a second node, and the common mode trap coupled between the first and second nodes. In one design, the common mode trap includes a first inductor coupled between the first node and a common node, a second inductor coupled between the second node and the common node, and a capacitor coupled between the common node and circuit ground. | 03-12-2009 |
20090153244 | LOW NOISE AND LOW INPUT CAPACITANCE DIFFERENTIAL MDS LNA - A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmetrical and cross-coupled fashion. The main transistors are source degenerated. Because the gates of cancel transistors are not coupled to the differential input leads of the LNA, the input capacitance of the LNA is reduced. Noise introduced into the LNA output due to the cancel transistors being biased in the sub-threshold region is reduced because there are two stages. The first stage involves the main transistors, and the second stage involves the cancel transistors. By increasing the gain of the first stage and decreasing the gain of the second stage, overall LNA gain is maintained while reducing the noise that the sub-threshold biased transistors contribute to the LNA output. | 06-18-2009 |
20090258624 | METHOD AND APPARATUS FOR PROCESSING A COMMUNICATION SIGNAL IN A RECEIVER - A receiver includes a jammer detector configured to detect the presence or the absence of jamming in a communication signal within a gain state. The receiver further includes an amplifier configured to amplify the communication signal in a high linearity receiving mode or a low linearity receiving mode, wherein the high linearity receiving mode corresponds with a lower gain for the gain state in the amplifier relative to that of the low linearity receiving mode. In addition, the receiver includes a processing unit coupled to the jammer detector, the processing unit being configured to control the amplifier to amplify the communication signal in either the high linearity receiving mode or the low linearity receiving mode, based on the output of the jammer detector detecting the presence or the absence of jamming in the communication signal. A method is also provided for processing a communication signal in a receiver. | 10-15-2009 |
20110105072 | DUAL INDUCTOR CIRCUIT FOR MULTI-BAND WIRELESS COMMUNICATION DEVICE - This disclosure describes a dual inductor circuit, which may be particularly useful in a mixer of a wireless communication device to allow the mixer to operate for two different frequency bands or in a multi-differential branch low noise amplifier wherein each of the differential branches possess a different set of gain and linearity characteristics for a signal operating at the same frequency. The dual inductor circuit comprises an inductor-within-inductor design in which a small inductor is disposed within a large inductor. The two inductors may share a ground terminal, but are otherwise physically separated and independent from one another. Terminals of the inner inductor, for example, are not tapped from the outer inductor, which can reduce parasitic effects and electromagnetic interference relative to tapped inductor designs. The independence of the inductors also allows the different inductors to define different resonance frequencies or gain and linearity characteristics, which is desirable. | 05-05-2011 |
20110115565 | CASCADED AMPLIFIERS WITH TRANSFORMER-BASED BYPASS MODE - Cascaded amplifiers with a transformer-based bypass mode are described. In an exemplary design, an apparatus includes first and second amplifiers and a circuit. The first amplifier (e.g., a driver amplifier) provides amplification in a high gain mode and a bypass mode. The second amplifier (e.g., a power amplifier) provides amplification in the high gain mode. The circuit is coupled between the first and second amplifiers and includes a transformer having (i) a primary coil coupled to the first amplifier and (ii) a secondary coil that provides an output signal in the bypass mode. The primary coil may be a load inductor for the first amplifier. The circuit may further include a series combination of a capacitor and a switch coupled in parallel with the primary coil, a switch coupled in series with the secondary coil, and/or a capacitor coupled in parallel with the secondary coil. | 05-19-2011 |
20120264482 | DUAL INDUCTOR CIRCUIT FOR MULTI-BAND WIRELESS COMMUNICATION DEVICE - A wireless communication device includes a component operating in a single frequency mode. The component includes a first differential branch that includes first input nodes and first output nodes. The first output nodes are coupled to ground. A second differential branch includes second input nodes, second output nodes, and a first planar inductor coupling a first terminal and a second terminal to ground. A third differential branch includes third input nodes, third output nodes, and a second planar inductor. The second planar inductor is formed within the first planar inductor of the second differential branch and couples a third terminal and a fourth terminal to ground. The third and fourth terminals are electrically independent from the first planar inductor and the first and second terminals. The second and third differential branches form a dual inductor circuit. | 10-18-2012 |
20130187712 | IMPEDANCE MATCHING CIRCUIT WITH TUNABLE NOTCH FILTERS FOR POWER AMPLIFIER - An impedance matching circuit with at least one tunable notch filter for a power amplifier is disclosed. The power amplifier amplifies an input radio frequency (RF) signal and provides an amplified RF signal. The impedance matching circuit performs output impedance matching for the power amplifier and includes at least one tunable notch filter. Each tunable notch filter has a notch that can be varied in frequency to provide better attenuation of an undesired signal. The at least one tunable notch filter attenuates at least one undesired signal in the amplified RF signal. The at least one tunable notch filter may include (i) a first tunable notch filter to attenuate a first undesired signal at a second harmonic of the amplified RF signal and/or (ii) a second tunable notch filter to attenuate a second undesired signal at a third harmonic of the amplified RF signal. | 07-25-2013 |
20130207732 | AMPLIFIER WITH REDUCED SOURCE DEGENERATION INDUCTANCE - Techniques for reducing undesired source degeneration inductance are disclosed. In an exemplary design, an apparatus includes first and second connections. The first connection includes a first parasitic inductance acting as a source degeneration inductance of an amplifier. The second connection includes a second parasitic inductance magnetically coupled to the first parasitic inductance to reduce the source degeneration inductance of the amplifier. The amplifier (e.g., a single-ended power amplifier) may be coupled to circuit ground via the first connection. An impedance matching circuit may be coupled to the amplifier and may include a circuit component coupled to circuit ground via the second connection. The first connection may be located sufficiently close to (e.g., within a predetermined distance of) the second connection in order to obtain the desired magnetic coupling between the first and second parasitic inductances. | 08-15-2013 |
20130214862 | ADJUSTABLE BYPASS CIRCUIT FOR A SUPPLY VOLTAGE FOR AN AMPLIFIER - Techniques for bypassing a supply voltage for an amplifier are disclosed. In an exemplary design, an apparatus includes an amplifier and an adjustable bypass circuit. The amplifier (e.g., a power amplifier) receives a supply voltage from a supply source. The adjustable bypass circuit is coupled to the supply source and provides bypassing for the supply voltage. The adjustable bypass circuit includes an adjustable capacitor or a fixed capacitor coupled to an adjustable resistor. The supply source may be (i) a power supply source providing a fixed supply voltage for the amplifier or (ii) an envelope tracker providing a variable supply voltage for the amplifier. | 08-22-2013 |
20140073267 | FILTERS FOR MULTI-BAND WIRELESS DEVICE - Techniques to implement a filter for a selected signal path by reusing a circuit component in an unselected signal path are disclosed. In an exemplary design, an apparatus includes first, second, and third circuits. The first circuit passes a first radio frequency (RF) signal to an antenna when a first signal path is selected. The second circuit passes a second RF signal to the antenna when a second signal path is selected. The third circuit is selectively coupled to the first circuit, e.g., via a switch. The first and third circuits form a filter for the second RF signal (e.g., to attenuate a harmonic of the second RF signal) when the second signal path is selected and the first signal path is unselected. The first circuit may include a series inductor, and the third circuit may include a shunt capacitor. | 03-13-2014 |
20150070095 | WIDEBAND BIAS CIRCUITS AND METHODS - The present disclosure includes circuits and methods for wideband biasing. In one embodiment, an amplifiers includes a cascode transistor between an input and an output of the amplifier. The cascode transistor receives a bias from a bias circuit comprising a resistor between the power supply and a first node, a resistor between the first node and a reference voltage, and a capacitor between the power supply and the first node. The power supply may be a modulated power supply, which is coupled through the bias circuit to a capacitance at the control terminal of the cascode transistor. An inductor is configured between a terminal of the cascode transistor and the power supply. The inductor may isolate the output from the modulated supply signal. | 03-12-2015 |