Abstract: An RF transmitter comprises a digital-to-IF circuit block configured to receive a digital in-phase baseband signal and a digital quadrature baseband signal and to up-convert the digital in-phase and quadrature baseband signals to a digital in-phase IF signal and to a digital quadrature IF signal. The wireless RF transmitter further comprises an IF-to-RF circuit block configured to convert the digital in-phase and quadrature IF signals to analog signals and to up-convert the analog in-phase and quadrature IF signals to an RF output signal. The digital-to-IF circuit block comprises pre-compensation circuitry configured to reduce analog impairments associated with the IF-to-RF circuit block.

Abstract: A system and method for minimizing a DC component of a received signal are disclosed. As one example, a system for minimizing a DC component of a signal in a wireless receiver is disclosed, which includes a programmable filter operable to filter the signal with at least one of a low cutoff frequency and a high cutoff frequency, and a transition unit coupled to the programmable filter, the transition unit operable to transition the programmable filter between the high cutoff frequency and the low cutoff frequency.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device. A portion of the signal is diverted from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the portion before combining the manipulated portion with the signal and other portion to at least partially cancel interference caused by the leak-over portion. After downconverting, a remainder portion is filtered from the received signal. A power level of the remainder portion is detected and compared to a threshold value. An amplitude and phase configuration of the cancellation circuitry is modified based on a result of comparing the power level to the threshold value.

Abstract: The present disclosure relates generally to systems and methods for optimized receiver performance in a low intermediate frequency (IF) architecture for EDGE (Enhanced Data rates for GSM Evolution). In one example, a method includes mixing a received analog signal with a local oscillator signal to create a mixed signal having an intermediate frequency between 101 kHz and 199 kHz. The mixed signal is compensated to minimize a direct current (DC) component introduced into the mixed signal by the local oscillator signal and an interferer image portion of the mixed signal is rejected. DC introduced into the mixed signal is minimized before final downconverting of the mixed signal, and DC remaining at the intermediate frequency after downconverting the mixed signal is minimized.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device and generates higher order products that interfere with a signal being received by the wireless device. A portion of the signal from the transmit chain is diverted into cancellation circuitry coupled to the receive chain prior to a location in the transmit chain where leak-over occurs, and an amplitude and phase of the portion is manipulated. The manipulated portion is combined with the received signal and other portion to at least partially cancel interference caused by the portion leaking over into the receive chain.

Abstract: The present disclosure relates generally to systems and methods for transmitter leak-over cancellation. In one example, a method includes transmitting a signal via a transmit chain in a wireless device, where a portion of the signal leaks over into a receive chain of the wireless device. A portion of the signal is diverted from the transmit chain into cancellation circuitry coupled to the receive chain to manipulate an amplitude and phase of the portion before combining the manipulated portion with the signal and other portion to at least partially cancel interference caused by the leak-over portion. After downconverting, a remainder portion is filtered from the received signal. A power level of the remainder portion is detected and compared to a threshold value. An amplitude and phase configuration of the cancellation circuitry is modified based on a result of comparing the power level to the threshold value.

Abstract: The present disclosure relates generally to systems and methods for direct current (DC) correction in wireless devices. In one example, a method includes setting a cutoff frequency of a filter at a first frequency, where a signal entering the filter is attenuated based on the cutoff frequency. If a qualified change is detected in a DC component of the signal, the cutoff frequency is set at a second frequency that attenuates more of the signal than the first frequency for a defined time period. The cutoff frequency may then be set to the first frequency after the defined time period.

Abstract: A system and method for minimizing a DC component of a received signal are disclosed. As one example, a system for minimizing a DC component of a signal in a wireless receiver is disclosed, which includes a programmable filter operable to filter the signal with at least one of a low cutoff frequency and a high cutoff frequency, and a transition unit coupled to the programmable filter, the transition unit operable to transition the programmable filter between the high cutoff frequency and the low cutoff frequency.

Abstract: The present disclosure relates generally to systems and methods for direct current (DC) correction in wireless devices. In one example, a method includes setting a cutoff frequency of a filter at a first frequency, where a signal entering the filter is attenuated based on the cutoff frequency. If a qualified change is detected in a DC component of the signal, the cutoff frequency is set at a second frequency that attenuates more of the signal than the first frequency for a defined time period. The cutoff frequency may then be set to the first frequency after the defined time period.

Abstract: A reconfigurable wireless transceiver and method of use are disclosed. As one example, a reconfigurable wireless transceiver is disclosed, which includes a transmitter unit, a plurality of receiver units, and a processing unit coupled to the plurality of receiver units. A first receiver unit of the plurality of receiver units receives a first signal at a first frequency, and determines a strength level of the first signal. A second receiver unit of the plurality of receiver units searches for a second signal at a second frequency, detects the second signal at the second frequency, and determines a strength level of the detected second signal. The processing unit determines if the strength level of the detected second signal is greater than a predetermined value, and enables the second receiver unit to receive a third signal at substantially the second frequency, if the strength level of the detected second signal is greater than the predetermined value.