Multi-input analog-to-digital converter

摘要

In an example, there is disclosed a multiple-input analog-to-digital converter configured to receive a plurality of analog inputs and to output one or more digital outputs. In one embodiment, two input analog signals are received. The two analog signals may be mixed in a combiner, which provides them to a pipeline ADC. In another embodiment, the combiner may time multiplex the two analog input signals and provide two separate outputs signals. Advantageously, the multiple-input ADC of the present Specification may be realized with a single ADC pipeline.

主权项

1. A multiple-input analog-to-digital converter (ADC) comprising:
a plurality of n receivers configured to receive n input bands; a combiner configured to combine at least two IF domain bands into a single IF domain input, wherein the combiner comprises:
a first switch network configured to receive a first input signal from one of the n input bands;a second switch network configured to receive a second input signal from another of the n input bands;a first sampling capacitor network configured to receive the first input signal from the first switch network and convert the first input signal to a first charge domain input;a second sampling capacitor network configured to receive the second input signal from the second switch network and convert the second input signal to a second charge domain input;an amplifier configured to drive a single analog output; anda feedback capacitor network disposed in a feedback configuration with the amplifier and configured to receive the first and second charge domain inputs;wherein the amplifier is further configured to convert the first and second charge domain inputs into the single analog output; and a converter element configured to convert the single IF domain input into a digital output.