Atheros Communications, Inc.

Qualcomm Incorporated

Qualcomm Atheros Inc.

Hirad Samavati

William John McFarland

David Kuochieh Su

Qinfang Sun

Srenik Suresh Mehta

Brian James Kaczynski

Qiang Lin

Alireza Kheirkhahi

A receiver for receiving both GPS signals and GLONASS signals is provided. This receiver includes an analog front end (AFE), a GPS digital front end (DFE) and a GLONASS DFE for receiving an output of the AFE, and a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs. Search engines are provided for receiving outputs of the DMI. Notably, certain front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals.

Analog front end for system simultaneously receiving GPS and GLONASS signals

A transceiver for use in a wireless device. The transceiver may include a receive portion for receiving an input RF signal. The receive portion may include at least one receive filter which may include a first filter. The transceiver may also include a transmit portion for transmitting an output RF signal. The transmit portion may include at least one transmit filter, which may include the first filter used in the receive portion. The transceiver may further include a plurality of switches, which may include a first switch coupled to an input of the first filter and a second switch coupled to an output of the first filter. The plurality of switches may be configurable to enable use of the first filter in the receive portion for receiving the input RF signal and use of the first filter in the transmit portion for transmitting the output RF signal.

Wireless transceiver using shared filters for receive, transmit and calibration modes

A variable transconductance device for a mixer apparatus is provided. The apparatus includes at least one variable current source circuit having a plurality of selectively enabled current source stages. Each of the current source stages, when enabled, is actuable to establish a conductive path between a first supply level and an output terminal. The device further includes at least one variable transconductance circuit having a plurality of selectively enabled transconductance stages. Each transconductance stage, when enabled, is actuable to establish a conductive path between a second supply level and the output terminal. An output current signal is generated at the output terminal responsive to actuation of the variable transconductance circuit by an input voltage signal, whereby the output current signal exhibits a power gain adjustably determined responsive to the numbers of current source and transconductance stages selectively enabled.

Variable transconductance mixer system

A quasi-balun circuit for receiving an unbalanced input and providing signals to a balanced-input low noise amplifier (LNA) is provided. Notably, this quasi-balun circuit can provide a phase difference between the positive and the negative terminals of the LNA that is greater than 90 degrees, but less than 180 degrees. In one embodiment, the quasi-balun circuit can provide a phase difference of approximately 135 degrees. To provide this functionality, the quasi-balun circuit includes a passive, reactive network coupled between the unbalanced input and the LNA.

Quasi-balun

An N-stage inductor-less local oscillator (LO) buffer can include N&#x2212;1 non-final stages and a final stage. The final stage can includes a gain circuit, a common-mode feedback circuit connected to the gain circuit, and a replica bias circuit that provides a predetermined voltage to the common-mode feedback circuit. The inductor-less LO buffer can advantageously reduce a power budget for its downstream mixer as well as provide a compact footprint.

Inductor-less local oscillator buffer

A gain controlled mixer for an integrated CMOS transceiver. Accuracy of the controlled gain may be relatively invariant over temperature, manufacturing process, and other variations attendant to circuit realizations in a CMOS transceiver, and other realizations. A plurality of substantially matched circuit elements are instantiated and disposed similarly within the gain controlled mixer, enhancing the gain accuracy of selectable gain control states. Matching gain and other functions between circuit elements is further enhanced by appropriately controlling DC operating point conditions.

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Santa Clara, CA, United States of America

Hirad Samavati