A discrete time filter, DTF, is described that comprises a summing node; N parallel branches, each branch having a set of input unit sampling capacitances where each unit sampling capacitance is independently selectively coupleable to the summing node; and an output capacitance connected to the summing node. The output capacitance has a value equal to a sum of the sampling capacitances that are to be selectively connected to the summing node; and the discrete time filter further comprises an inductance connected between the summing node and the output capacitance.

There is provided a communication receiver comprising: an input for receiving a radio frequency, RF, input signal; and at least one finite impulse response, FIR, discrete time filter, DTF. The at least one FIR DTF comprises: an input circuit comprising an input port for sampling the RF input signal at a sampling frequency that is comparable to the input RF input signal; and N parallel branches, each branch having a set of input unit sampling capacitances, where each unit sampling capacitance is independently selectively coupleable to an output summing node. The input circuit is configured to convert an equivalent input impedance of the at least one FIR DTF around the sampling frequency to a real impedance.

A wideband receiver system comprises a wideband analog-to-digital converter (ADC) module and a digital frontend (DFE) module. The wideband ADC is configured to concurrently digitize a band of frequencies comprising a plurality of desired channels and a plurality of undesired channels. The DFE module is coupled to the digital in-phase and quadrature signals. The DFE module is configured to select the plurality of desired channels from the digitized band of frequencies, and generate an intermediate frequency (IF) signal comprising the selected plurality of desired channels and having a bandwidth that is less than a bandwidth of the band of frequencies, where the generation comprises frequency shifting of the selected plurality of desired channels. The IF signal may be a digital signal and the DFE is configured to output the IF signal via a serial or parallel interface.

Systems and methods to simultaneously transmit a plurality of transmit signals, assign control logic to assign transmit signals to transmitters, receive a superimposed receive signal comprising a plurality of receive signal components originating from the transmit signals, wherein two receive signal components of the superimposed receive signal are in quadrature. Capacitive touch systems and methods comprising: transmitters of transmit signals; transmit electrodes and a receive electrode positioned to have mutual capacitances between the transmit electrodes and the receive electrode at mutual capacitance nodes, wherein a mutual capacitance at a mutual capacitance node deviates when an interfering object is proximate, wherein the transmit electrodes are physically adjacent, wherein the transmit electrodes are driven by the transmit signals, and a receiver of a superimposed receive signal comprising receive signal components that are in quadrature.

A system may include a digital front end (DFE). The DFE may be configured to generate a command signal. The system may also include a sweeper. The sweeper may be configured to generate an intermediate in-phase signal, an intermediate quadrature signal, and a LO signal based on the command signal. In addition, the system may include a mixer. The mixer may be configured to generate a mixed in-phase signal based on the intermediate in-phase signal and the LO signal. The mixer may also be configured to generate a mixed quadrature signal based on the intermediate quadrature signal and the LO signal. Further, the system may include an amplifier. The amplifier may be configured to generate an in-phase signal based on the mixed in-phase signal and an amplification setting. The amplifier may also be configured to generate a quadrature signal based on the mixed quadrature signal and the amplification setting.

A node apparatus and methods involving the same. The node including a Distributed Unit (DU); and a Radio Unit (RU) in communication with the DU, wherein the RU comprises: a first port for interfacing with a signal transmitted from the DU, wherein the signal transmitted from the DU comprises at least an 8 layer spatial stream; a Digital Front End (DFE) configured to process the spatial stream by combining a first four streams of the spatial stream in a first Digital to Analog (DAC) converter to form a first signal, and by combining a second four streams of the spatial stream in a second DAC, to form a second signal; and a second port in communication with a coaxial cable, wherein the coaxial cable is configured to transmit a combined signal.