Electronic system comprising a sensor structure and an analog interface connected thereto with sensor independent operating range

摘要

An electronic system comprises a resistive sensor structure and an electronic circuit portion whose design is selected such that different resistive sensor structures may be combined within the same electronic circuit. To this end, the resistive sensor structure is used as a voltage/current converter that provides input currents to a current amplifier, which in turn provides an amplified output voltage on the basis of a difference of the input currents. The operating range of the current amplifier is adjusted on the basis of a programmable current source irrespective of the configuration of the resistive sensor structure.

主权项

1. An electronic system comprising:
a sensor structure including first and second resistors, at least one of said first and second resistors being a variable resistor, the sensor structure being configured to provide first and second sensor currents; and an analog interface electrically coupled to said sensor structure, said analog interface including a first adjustable current source configured to provide a first source current and a current amplifier electrically coupled between first and second voltage terminals and configured to be supplied by the first source current from the first adjustable current source, receive the first and second sensor currents from said sensor structure, and provide an output signal indicative of an amplified difference of said first and second sensor currents, the current amplifier including:
first and second input nodes, the first and second resistors being electrically coupled between the first voltage terminal and the first and second input nodes, respectively; anda first current mirror that includes a first mirror transistor electrically coupled with the first adjustable current source between the first voltage terminal and the first input node of the current amplifier, and a second mirror transistor electrically coupled between the first voltage terminal and the second input node of the current amplifier.