Analog to digital conversion

摘要

A delta-sigma analog-to-digital converter includes: a summing stage having a first input for an input signal and a second input for a feedback signal; an integrator coupled to an output of the summing stage; an analog-to-digital conversion stage coupled to an output of the integrator; and a switchable gain stage coupled in a feedback path between an output of the analog-to-digital conversion stage and the second input of the summing stage. The switchable gain stage is arranged to switch, responsive to a gain selection signal, between a first gain and a second gain via a transition period comprising time periods during which the switchable gain stage has the first gain interleaved with time periods during which the switchable gain stage has the second gain.

主权项

1. A delta-sigma analog-to-digital converter, comprising:
a summing stage having a first input for an input signal and a second input for a feedback signal; an integrator coupled to an output of the summing stage; an analog-to-digital conversion stage coupled to an output of the integrator; and a switchable gain stage coupled in a feedback path between an output of the analog-to-digital conversion stage and the second input of the summing stage; wherein the switchable gain stage is arranged to switch, responsive to a gain selection signal, between a first gain and a second gain via a transition period comprising time periods during which the switchable gain stage has the first gain interleaved with time periods during which the switchable gain stage has the second gain, wherein the time periods at the first gain comprise time periods that decrease in duration over the transition period and the time periods at the second gain comprise time periods that increase in duration over the transition period.