Patent application number | Description | Published |
20080218267 | Amplifier with level shifting feedback network - An amplifier circuit includes a low noise first stage and a wide dynamic range second stage. A feedback network coupled between the output of the second stage and the input of the first stage provides DC level shifting of the common mode input voltage. The common mode input voltage is shifted to a value that allows the output of the first stage to be compatible with the input of the second stage. | 09-11-2008 |
20080219329 | Local oscillator control in radio receivers - A radio receiver measures a signal quality metric and modifies attributes of a local oscillator signal in response thereto. A digital signal processor may be used to determine a signal-to-noise-plus-distortion ratio (SNDR) of a baseband signal, and the overlap of two quadrature-related local oscillator signals may be modified. | 09-11-2008 |
20080224775 | Variable Gain Amplifier - A variable gain amplifier includes multiple gain stages. Each gain stage includes a gain transistor and a cascode transistor to form a cascode amplifier, and a current diversion transistor to divert current away from a cascode transistor to reduce gain in the stage. A control circuit is included to maintain substantially constant drain-to-source voltage and drain current in the gain transistor. | 09-18-2008 |
20080272824 | CMOS RF switch for high-performance radio systems - A wireless device includes high-performance CMOS RF switches that include serially connected transistors coupled between an input terminal and an output terminal, with an inductor coupled from the input to the output that resonates out the capacitance of the transistors to improve isolation. The transistors have a floating/bootstrapped body with remote body contacts. | 11-06-2008 |
20080278220 | HIGH-LINEARITY LOW NOISE AMPLIFIER AND METHOD - Embodiments of a high-linearity low-noise amplifier (LNA) and method are generally described herein. Other embodiments may be described and claimed. In some embodiments, an RF input signal may be amplified with a cascode amplifier and a common-gate stage. The common-gate stage is dynamically biased based on an output voltage of the common-gate stage to allow an output voltage swing to be shared between the cascode amplifier and the common-gate stage. | 11-13-2008 |
20080297246 | Polar amplifier - An amplifier circuit receives a phase modulated signal at an input node. The power supply terminal of the amplifier circuit is modulated in accordance with an amplitude envelope signal. The voltage on the power supply terminal is modulated using one or more linear regulators depending on the magnitude of the envelope signal. | 12-04-2008 |
20080297262 | Increased gain high-frequency amplifier - In general, in one aspect, the disclosure describes an amplifier that includes a first transistor coupled to ground and a second transistor coupled to the first transistor and a supply voltage. A voltage biasing circuit is used to provide biased voltages to the first and second transistors. An inductor coupled between the voltage biasing circuit and the second transistor. | 12-04-2008 |
20090021295 | Dual reactive shunt low noise amplifier - A dual reactive shunt feedback low noise amplifier design may include a transconductance amplifier having a capacitor coupled across it and a pair of coupled inductors coupled across it. In one embodiment, the coupled inductors may be laid out as two overlapping coils. | 01-22-2009 |
20090029654 | Using radio frequency transmit/receive switches in radio frequency communications - A metal oxide semiconductor radio frequency transmit/receive switch may enable lower costs and smaller size. The switch uses an inductor and a capacitor circuit to isolate the power amplifier from the low noise amplifier. Metal oxide semiconductor switches are utilized to switch between transmit and receive modes. | 01-29-2009 |
20090325529 | CALIBRATING RECEIVE CHAIN TO REDUCE SECOND ORDER INTERMODULATION DISTORTION - Embodiments of apparatuses, articles, methods, and systems for calibrating receive chain to reduce second order intermodulation distortion are disclosed herein. The embodiments may be employed, e.g., to manage power in wireless networks. Other embodiments and usages may be described and claimed. | 12-31-2009 |
20100259331 | HIGH-LINEARITY LOW NOISE AMPLIFIER - Embodiments of a high-linearity low-noise amplifier (LNA) are generally described herein. Other embodiments may be described and claimed. In some embodiments, an RF input signal may be amplified with a cascode amplifier. The cascode amplifier may include integrated notch filters to attenuate undesired signals. The cascode amplifier may operate from a large power supply when blockers are present to avoid voltage swing compression at its output. The cascode amplifier may be biased and designed to operate in a class AB mode to produce linear output current to avoid current compression or excessive current expansion. | 10-14-2010 |
20110057732 | LOW PHASE NOISE VOLTAGE CONTROLLED OSCILLATOR - Embodiments of the present invention include a low phase noise oscillator circuit using a current-reuse technique to reduce power consumption and improve phase noise, where the oscillator circuit comprises a first VCO coupled to a second VCO, and the outputs of the first and second VCOs are coupled with passive elements, such as capacitors. The overall power consumption of both the first and second VCOs is about the same as a single VCO. Furthermore, the phase noise is lowered by around 3 dB. Thus, the phase noise performance is improved without increasing the power consumption of the oscillator circuit | 03-10-2011 |
20140206301 | TRANSCEIVER WITH AN INTEGRATED RX/TX CONFIGURABLE PASSIVE NETWORK - Disclosed is an apparatus including a transmitter amplifier having an output terminal communicatively coupled to a transmission line to output a first set of radio frequency (RF) signals to an antenna. The apparatus may include a receiver amplifier having an input terminal communicatively coupled to the transmission line to receive a second set of RF signals from the antenna. The apparatus may include a passive network coupled between the transmitter amplifier and the receiver amplifier, the passive network being configurable to cancel either a first reactance of a parasitic capacitance of the transmitter amplifier or second reactance of a parasitic capacitance of the receiver amplifier. The apparatus may also include a switch coupled between the input terminal and a voltage reference to selectively configure the passive network to cancel either the first reactance or the second reactance. Other embodiments may be described and claimed. | 07-24-2014 |