Abstract:
PROBLEM TO BE SOLVED: To provide a calibration system for an analog-to-digital converter (ADC) internal ADC that receives an analog input and converts an analog input to digital multi-bit data.SOLUTION: The calibration system includes a noise source, and a reference shuffling circuit that shuffles reference values of comparators of the internal ADC. The calibration system also includes a calibration circuit that calibrates the comparators of the internal ADC. The calibration system also includes a digital block that measures amplitude based on the digital multi-bit data. The calibration system also includes calibration logic that controls the calibration circuit based on an output of the digital block.
Abstract:
PROBLEM TO BE SOLVED: To provide a descriptor base stream processor for image processing, and a method related to the same.SOLUTION: A method includes defining a kernel pattern related to an image frame, and processing the image frame by using the defined kernel pattern, and further includes creating a kernel switch look-up table based on the defined kernel pattern. A stream controller is capable of operation to instruct the execution of kernel to the image frame according to the defined kernel pattern and the kernel switch look-up table.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved power amplifier that compensates for nonlinearity efficiently with low power consumption.SOLUTION: A amplifier system may include a pre-distorter for receiving an input signal to generate a pre-distortion signal, a first converter for receiving the pre-distortion signal to generate a pre-amplified signal, a power amplifier for receiving the pre-amplified signal to generate an output signal on the basis of the pre-amplified signal and the input signal, and a second converter for sampling the output signal to generate a feedback signal. The power amplifier may produce a distortion signal at a first frequency, the second converter may sample the output signal by the use of a timing signal with a second frequency lower than the first frequency to generate the feedback signal, and the pre-distorter may, on the basis of the feedback signal, pre-distort the pre-distortion signal to reduce the distortion signal at the first frequency.
Abstract:
PROBLEM TO BE SOLVED: To provide a low-power and reduced-size RF noise cancellation circuit that is able to cost efficiently minimize transmitter noise leakage in received signals without having its adaptation rate reduced by external blockers.SOLUTION: Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a circuit and a method in which an all digital model of nonlinear transmitter signal distortion in signals received at a receiver of a transmitter-receiver may be used to estimate distortion, and the estimated distortion may then be cancelled from the received signals to improve signal quality of the received signal.SOLUTION: A digital nonlinear model may be part of an estimation circuit that estimates nonlinear distortion terms by applying a formula or transformation to a digitized version of transmission signals at a transmitter of the transmitter-receiver. A mixer may be used to shift a frequency of the estimated nonlinear terms away from a transmitter frequency so that the nonlinear terms can later be subtracted from the incoming signal received at the receiver at a receiver frequency. A circuit and a method are provided.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved power amplifier that compensates for baseband nonlinearity.SOLUTION: An amplifier may include a pre-distorter for receiving an input signal to generate a pre-distortion signal, a first converter for receiving the pre-distortion signal to generate a pre-amplified signal, a power amplifier for receiving the pre-amplified signal to generate an output signal on the basis of the pre-amplified signal and the input signal, and a second converter for sampling the output signal to generate a feedback signal. The pre-distorter may separately and independently generate a pre-distortion signal component for an in-phase input signal and a pre-distortion signal component for a quadrature input signal.
Abstract:
PROBLEM TO BE SOLVED: To provide a MEMS sensor that has a spectrum dispersion modulation self-testing capability.SOLUTION: A MEMS sensor comprises: a detection circuit 106 that is configured so as to detect a stimulant generated by a microelectromechanical system 102 in a sensor band width of a device output signal; and a self-test circuit 112 that generates a test output signal 130 indicative of a status of the microelectromechanical system 102 by injecting a self-test signal 114 in a signal route of the microelectromechanical system 102 including a MEMS structure having something to do with a generation of the stimulant in the sensor band width of the device output signal. The self-test signal 114 is a spectrum dispersion signal that has a test signal band width overlapped with at least one part of the sensor band width.