System and method for a transducer interface

摘要

According to an embodiment, an interface circuit includes a current replicator and a receiver. The current replicator includes a power terminal coupled to a first reference node, an output terminal configured to output a signal proportional to a signal received from a transducer, and an interface terminal coupled to the transducer. Using a single interface terminal, the current replicator may be configured to provide power to the transducer and receive output signals from the transducer. The receiver may include a first input terminal coupled to the output terminal, a second input terminal coupled to a second reference node, and a current converter circuit coupled to the first input terminal.

主权项

1. An interface circuit comprising:
a current replicator comprising
a power terminal configured to be coupled to a first reference node,an output terminal configured to output a replica current, anda single interface terminal configured to be coupled to a transducer, wherein the current replicator is configured to
provide a power supply current to an active component of the transducer on the single interface terminal, andgenerate the replica current, the replica current being proportional to the power supply current; and a receiver comprising
a first input terminal coupled to the output terminal,a second input terminal coupled to a second reference node,a current converter circuit coupled to the first input terminal, anda codec configured to encode analog signals and coupled to the current converter circuit.