Sensor current interface transceiver with adaptive linearization

摘要

Some embodiments of the present disclosure relate to a sensor interface module having a linearization module that increase a size of a linear region of a current output from a high-side current source. The disclosed sensor interface module has a reference voltage source configured to generate a reference signal. An output driver stage having a high-side current source and a low-side current source is connected in series at an output node of the sensor interface module. A closed control loop configured to receive the reference signal and to generate a digital control signal that drives the high-side current source. A linearization module configured to operate the low-side current source to approximate a nonlinearity of the high-side current source and to use the approximated nonlinearity to generate a compensation function that mitigates nonlinearities in the high side current source.

主权项

1. An automotive control unit (ACU), comprising;
a reference voltage source configured to generate a reference signal; an output driver stage having a high-side current source configured to produce a high-side current connected in series at an output node to a low-side current source configured to produce a low-side current; a closed control loop configured to receive the reference signal and to generate a first signal that operates either the high-side current source or the low-side current source to generate an output signal at the output node; and a linearization module configured to vary a current of a current source that is not operated to generate the output signal to approximate a nonlinearity of the current source that is operated to generate the output signal, and to use the approximated nonlinearity to mitigate the nonlinearity.