An analog-digital conversion apparatus includes: an analog-digital converter (ADC) included in an integrated circuit (IC) and configured to operate based on a sampling clock constituting a portion of a plurality of clocks; and a driver included in the IC and configured to operate based on another portion of the plurality of clocks, and produce a driving signal based on a digital value output from the ADC. The ADC and the driver are synchronized with each other based on an interrupt request (Irq) of the IC.

A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

An A/D converter includes: a sampler that includes a sampling capacitor and samples an input signal; a D/A converter that selectively outputs an analog voltage; an integrator that integrates an input from the sampler and an input from the D/A converter; Multiple switches that include a first switch independently connecting the sampler to the integrator, a second switch independently connecting the D/A converter to the integrator, a third switch, and, a fourth switch, a quantizer that quantizes an output of the integrator; a control circuit that outputs a digital value based on an output of the quantizer, and a reference potential generation circuit that provides a second reference potential to an integrator side of the sampler through the third switch and provides a first reference potential to the integrator side of the D/A converter through the fourth switch.

An A/D converter includes: a sampler that includes a sampling capacitor and samples an input signal; a D/A converter that selectively outputs an analog voltage; an integrator that integrates an input from the sampler and an input from the D/A converter; Multiple switches that include a first switch independently connecting the sampler to the integrator, a second switch independently connecting the D/A converter to the integrator, a third switch, and, a fourth switch, a quantizer that quantizes an output of the integrator; a control circuit that outputs a digital value based on an output of the quantizer, and a reference potential generation circuit that provides a second reference potential to an integrator side of the sampler through the third switch and provides a first reference potential to the integrator side of the D/A converter through the fourth switch.

A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

A sigma-delta analog-to-digital converter (ADC) is disclosed. The sigma delta ADC has an analog input and a digital output. A sigma-delta modulator input is coupled to the analog input and a sigma-delta modulator output. A first filter having a first filter input is coupled to the sigma-delta modulator output and a first filter output. A second filter having a second filter input is coupled to the sigma-delta modulator output and a second filter output. The sigma-delta ADC operates in a first and second mode. In a first mode, the first filter output is coupled to the digital output. In a second mode, the second filter output is coupled to the digital output.

Various embodiments of the present technology may comprise methods and apparatus for an analog-to-digital converter. Methods and apparatus for an analog-to-digital converter (ADC) may be configured as a delta-sigma type ADC and include an integrator circuit formed using two switched-capacitor (SC) circuits that share a single operational amplifier. The switched-capacitor circuits receive various control signals such that one SC circuit performs sampling while the other SC circuit simultaneously performs integration.

A baseband processing unit includes a baseband processor configured to receive a plurality of component carriers of a radio access technology wireless service, and a delta-sigma digitization interface configured to digitize at least one carrier signal of the plurality of component carriers into a digitized bit stream, for transport over a transport medium, by (i) oversampling the at least one carrier signal, (ii) quantizing the oversampled carrier signal into the digitized bit stream using two or fewer quantization bits.

Various embodiments of the present technology may comprise methods and apparatus for an analog-to-digital converter. Methods and apparatus for an analog-to-digital converter (ADC) may be configured as a delta-sigma type ADC and include an integrator circuit formed using two switched-capacitor (SC) circuits that share a single operational amplifier. The switched-capacitor circuits receive various control signals such that one SC circuit performs sampling while the other SC circuit simultaneously performs integration.

A sigma-delta analog-to-digital converter (ADC) is disclosed. The sigma delta ADC has an analog input and a digital output. A sigma-delta modulator input is coupled to the analog input and a sigma-delta modulator output. A first filter having a first filter input is coupled to the sigma-delta modulator output and a first filter output. A second filter having a second filter input is coupled to the sigma-delta modulator output and a second filter output. The sigma-delta ADC operates in a first and second mode. In a first mode, the first filter output is coupled to the digital output. In a second mode, the second filter output is coupled to the digital output.