Abstract: A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.

Abstract: Examples are provided for a multi-stage track-and-hold circuit (THA). The multi-stage THA may include a first stage, a second stage, and a third stage. The first stage may be coupled to an input signal and configured to sample the input signal. The second stage may be coupled to the first stage and may include a buffer circuit. The third stage may be coupled to the second stage and can include a bootstrapped THA. The first stage may further include a shunted source-follower circuit and a switched source-follower circuit. The shunted source-follower circuit may include a first switch that can be operable to couple an output node of the shunted source-follower circuit to ground potential.

Abstract: Examples are provided for a multi-stage track-and-hold amplifier (THA). The multi-stage THA may include a first stage, a second stage, and a third stage. The first stage may be coupled to an input signal and configured to sample the input signal. The second stage may be coupled to the first stage and may include a buffer circuit. The third stage may be coupled to the second stage and can include a bootstrapped THA. The first stage may further include a shunted source-follower circuit and a switched source-follower circuit. The shunted source-follower circuit may include a first switch that can be operable to couple an output node of the shunted source-follower circuit to ground potential.

Abstract: A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.

Abstract: Examples are provided for a method and apparatus for calibration of an analog-to-digital converter (ADC). The method includes selecting a reference sub-ADC from multiple sub-ADCs. A calibration signal is sent to an input node of each sub-ADC of the sub-ADCs. For each sub-ADC, other than the reference sub-ADC, a corresponding error signal is generated based on output signals of the sub-ADC and the reference sub-ADC. Each sub-ADC is calibrated based on the corresponding error signal. The ADC may be a time-interleaved ADC that includes the plurality of sub-ADCs, and the reference sub-ADC has a lowest relative offset among the sub-ADCs.

Abstract: A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.

Abstract: Examples are provided for time-interleaved analog-to-digital conversion with redundancy. The redundancy may include high-order and nested redundancies. An apparatus may include multiple analog-to-digital converter (ADC) blocks coupled to one another to form a time-interleaved ADC. Each ADC block may include multiple ADC slices, wherein a count of the ADC blocks is M and some of the ADC slices may be redundant slices. A clock circuit may be configured to provide multiple clock signals. A portion N of M ADC blocks may be configured to be active, in a normal mode of operation, where N and M are integer numbers and N is smaller than M. A remaining portion of the M ADC blocks may be redundant ADC blocks, one or more of which may be selectively active, in a healing mode of operation, and be swapped for one or more failed ADC blocks using the plurality of clock signals.

Abstract: Examples are provided for time-interleaved analog-to-digital conversion with redundancy. The redundancy may include high-order and nested redundancies. An apparatus may include multiple analog-to-digital converter (ADC) blocks coupled to one another to form a time-interleaved ADC. Each ADC block may include multiple ADC slices, wherein a count of the ADC blocks is M and some of the ADC slices may be redundant slices. A clock circuit may be configured to provide multiple clock signals. A portion N of M ADC blocks may be configured to be active, in a normal mode of operation, where N and M are integer numbers and N is smaller than M. A remaining portion of the M ADC blocks may be redundant ADC blocks, one or more of which may be selectively active, in a healing mode of operation, and be swapped for one or more failed ADC blocks using the plurality of clock signals.

Abstract: Examples are provided for a time-interleaved analog-to-digital converter (ADC) with built-in self-healing. The ADC may include multiple ADC slices. Each ADC slice may be configured to operate in one of a normal or a healing mode of operation. In the normal mode of operation, each ADC slice may convert an input analog signal to a single digital output signal in response to a clock signal associated with the ADC slice. In the healing mode of operation, each ADC slice may be operable to convert the input analog signal to two or more digital output signals in response to two or more clock signals. One or more of the digital output signals may replace one or more output signals of failed ADC slices. A first clock signal may be associated with the ADC slice. A second clock signal may be associated with another ADC slice of the plurality of ADC slices.

Abstract: A programmable-current transmit continuous-time filter (TX-CTF) system can be included in a radio frequency (RF) transmitter. The input of the TX-CTF can receive a baseband transmission signal, and the output of the TX-CTF can be provided to an upconversion mixer for conversion to RF for transmission. The TX-CTF includes amplifier circuitry and passive circuitry that together define the filter parameters. The TX-CTF further includes programmable current circuitry that provides a programmable bias current to the amplifier circuitry. The TX-CTF system also includes control logic that receives one or more transmitter control signals and, in response, generates signals that control the bias current provided to the TX-CTF.