Patent ID: 6765391
Filing Date: 2004-07-20
Classification: G01R

Abstract:
A Wheatstone bridge conditioning circuit comprisingfirst and second half bridges and an integrated circuit having an integrated circuit power supply, first and second half bridge power supply nodes connected to at least one power supply for providing first and second half bridge power supplies, first and second integrated circuit half bridge input nodes and at least one ground node, the first half bridge having first and second stimulus responsive bridge elements serially connected between the first half bridge power supply node and a ground node and having a first half bridge output at the junction between the first and second bridge elements which is connected to the first integrated circuit half bridge input node and the second half bridge having third and fourth stimulus responsive bridge elements serially connected between the second half bridge power supply node and a ground node and having a second half bridge output at the junction between the third and fourth bridge elements which is connected to is the second integrated circuit half bridge input node, first and second offset and gain compensation control circuits, first and second amplifiers each having two inputs and an output, the integrated circuit first and second half bridge input nodes connected respectively to one input of the first and second amplifiers and the second amplifier inputs of the first and second amplifiers connected to voltage signals proportional to voltages of first and second half bridge power supplies respectively, the output of the first and second compensation control circuits connected respectively to the first and second amplifiers, the output of the first and second amplifiers each having an output signal proportional to respective first and second Wheatstone half bridge output voltages with each amplifier output signal having offset and gain adjustment to an applied stimulus.