Abstract: A transceiver for receiving multiple desired signals is described. The transceiver includes a first downconverter that receives a first received signal. The transceiver also includes a second downconverter that receives the first received signal. The transceiver further includes a first adder that receives an output of the first downconverter and a second received signal. The transceiver also includes a second adder that receives an output of the second downconverter.

Abstract: A wireless communication device configured for receiving a multiple carrier signal is described. The wireless communication device includes a primary signal splitting carrier aggregation architecture. The primary signal splitting carrier aggregation architecture includes a primary antenna and a transceiver chip. The primary signal splitting carrier aggregation architecture reuses a first diversity/simultaneous hybrid dual receiver path. The wireless communication device also includes a secondary signal splitting carrier aggregation architecture. The secondary signal splitting carrier aggregation architecture includes a secondary antenna and a receiver chip. The secondary signal splitting carrier aggregation architecture reuses a second diversity/simultaneous hybrid dual receiver path.

Abstract: A wireless communication device configured for providing carrier aggregation is described. The wireless communication device includes at least one antenna configured to receive a plurality of wireless signals. The wireless communication device also includes a first transceiver. The first transceiver includes a first downconverting circuitry. The wireless communication device further includes a second transceiver. The second transceiver includes a second downconverting circuitry. The wireless communication device also includes an inter-transceiver connection that routes a first signal from a low noise amplifier on the first transceiver to the second downconverting circuitry of the second transceiver.

Abstract: Techniques for calibrating a receiver based on a local oscillator (LO) signal from another receiver are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or an integrated circuit) includes first and second local oscillator (LO) generators. The first LO generator generates a first LO signal used by a first receiver for frequency downconversion. The second LO generator generates a second LO signal used by a second receiver for frequency downconversion in a first operating mode. The second LO signal is used to generate a test signal for the first receiver in a second operating mode. The second LO signal may be provided as the test signal or may be amplitude modulated with a modulating signal to generate the test signal. The test signal may be used to calibrate residual sideband (RSB), second order input intercept point (IIP2), receive path gain, etc.

Abstract: Techniques for using one or multiple downconverters to receive multiple transmissions sent on multiple carriers are disclosed. In an exemplary design, an apparatus includes first and second downconverters. The first downconverter downconverts a first radio frequency (RF) signal when it is selected. The second downconverter downconverts a second RF signal when it is selected. Each of the first and second RF signals includes multiple transmissions sent on multiple carriers to a wireless device. The first downconverter is selected to perform downconversion for the multiple transmissions when at least one criterion is not met. The first and second downconverters are selected to perform downconversion for the multiple transmissions, based on different mixing frequencies, when the at least one criterion is met. The at least one criterion may relate to imbalance between the multiple carriers, received power of a received RF signal, etc.

Abstract: A wireless device for receiving wireless signals based on channel conditions is described. The wireless device includes a direct sampling path used when operating in a direct sampling mode. The wireless device also includes a zero intermediate frequency path used when operating in a normal sampling mode. The wireless device further includes a first switch coupling a filter module input to an input of the direct sampling path and an input of the zero intermediate frequency path. The wireless device also includes a second coupling a filter module output to an output of the direct sampling path and an output of the zero intermediate frequency path. The first switch and the second switch are configured to switch between the direct sampling path and the zero intermediate frequency path based on a received signal power.

Abstract: A wireless device for receiving wireless signals based on channel conditions is described. The wireless device includes a direct sampling path used when operating in a direct sampling mode. The wireless device also includes a zero intermediate frequency path used when operating in a normal sampling mode. The wireless device further includes a first switch coupling a filter module input to an input of the direct sampling path and an input of the zero intermediate frequency path. The wireless device also includes a second coupling a filter module output to an output of the direct sampling path and an output of the zero intermediate frequency path. The first switch and the second switch are configured to switch between the direct sampling path and the zero intermediate frequency path based on a received signal power.

Abstract: Techniques for dynamically selecting a number of downconversion paths used in a variety of receiver, wideband receiver architectures, for example, zero-IF or low-IF. In an exemplary embodiment, a first downconversion path is configured to downconvert a signal derived from an RF signal using a first mixing frequency. A second downconversion path is further configured to downconvert a signal derived from the RF signal using a second mixing frequency distinct from the first mixing frequency. The second downconversion path may be selectively enabled or disabled based on a detected level of an interferer in the frequency spectrum. For example, if the interferer level is less than a predetermined threshold, a fewer number of downconversion paths, for example, one path, may be enabled. If the interferer level is greater than a predetermined threshold, then a greater number of downconversion paths, for example, two or more paths, may be enabled.

Abstract: Techniques for calibrating a receiver based on a local oscillator (LO) signal from another receiver are disclosed. In an exemplary design, an apparatus (e.g., a wireless device or an integrated circuit) includes first and second local oscillator (LO) generators. The first LO generator generates a first LO signal used by a first receiver for frequency downconversion. The second LO generator generates a second LO signal used by a second receiver for frequency downconversion in a first operating mode. The second LO signal is used to generate a test signal for the first receiver in a second operating mode. The second LO signal may be provided as the test signal or may be amplitude modulated with a modulating signal to generate the test signal. The test signal may be used to calibrate residual sideband (RSB), second order input intercept point (IIP2), receive path gain, etc.

Abstract: A transceiver for receiving multiple desired signals is described. The transceiver includes a first downconverter that receives a first received signal. The transceiver also includes a second downconverter that receives the first received signal. The transceiver further includes a first adder that receives an output of the first downconverter and a second received signal. The transceiver also includes a second adder that receives an output of the second downconverter.

Abstract: Techniques for using one or multiple downconverters to receive multiple transmissions sent on multiple carriers are disclosed. In an exemplary design, an apparatus includes first and second downconverters. The first downconverter downconverts a first radio frequency (RF) signal when it is selected. The second downconverter downconverts a second RF signal when it is selected. Each of the first and second RF signals includes multiple transmissions sent on multiple carriers to a wireless device. The first downconverter is selected to perform downconversion for the multiple transmissions when at least one criterion is not met. The first and second downconverters are selected to perform downconversion for the multiple transmissions, based on different mixing frequencies, when the at least one criterion is met. The at least one criterion may relate to imbalance between the multiple carriers, received power of a received RF signal, etc.

Abstract: A wireless communication device configured for automatic calibration is described. The wireless communication device includes a testing load. The wireless communication device also includes a transceiver chip. The wireless communication device further includes a radio frequency connector switch that couples circuitry on the transceiver chip to one of the testing load, an external load and a radiating element.

Abstract: Techniques for dynamically selecting a number of downconversion paths used in a variety of receiver, wideband receiver architectures, for example, zero-IF or low-IF. In an exemplary embodiment, a first downconversion path is configured to downconvert a signal derived from an RF signal using a first mixing frequency. A second downconversion path is further configured to downconvert a signal derived from the RF signal using a second mixing frequency distinct from the first mixing frequency. The second downconversion path may be selectively enabled or disabled based on a detected level of an interferer in the frequency spectrum. For example, if the interferer level is less than a predetermined threshold, a fewer number of downconversion paths, for example, one path, may be enabled. If the interferer level is greater than a predetermined threshold, then a greater number of downconversion paths, for example, two or more paths, may be enabled.

Abstract: A wireless communication device configured for receiving a multiple carrier signal is described. The wireless communication device includes a primary signal splitting carrier aggregation architecture. The primary signal splitting carrier aggregation architecture includes a primary antenna and a transceiver chip. The primary signal splitting carrier aggregation architecture reuses a first diversity/simultaneous hybrid dual receiver path. The wireless communication device also includes a secondary signal splitting carrier aggregation architecture. The secondary signal splitting carrier aggregation architecture includes a secondary antenna and a receiver chip. The secondary signal splitting carrier aggregation architecture reuses a second diversity/simultaneous hybrid dual receiver path.

Abstract: A wireless communication device configured for providing carrier aggregation is described. The wireless communication device includes at least one antenna configured to receive a plurality of wireless signals. The wireless communication device also includes a first transceiver. The first transceiver includes a first downconverting circuitry. The wireless communication device further includes a second transceiver. The second transceiver includes a second downconverting circuitry. The wireless communication device also includes an inter-transceiver connection that routes a first signal from a low noise amplifier on the first transceiver to the second downconverting circuitry of the second transceiver.