Patent ID: 9008197
Filing Date: 2015-04-14
Classification: H04B,H04L

Abstract:
1. An integrated circuit, comprising: differential amplifier having a first input and a second input, wherein the first input is coupled directly to a first of two terminals of the integrated circuit and wherein the second input is coupled indirectly to a second of the two terminals of the integrated circuit, and wherein the differential amplifier is configured to generate a voltage difference signal in relation to a voltage difference across the first input and the second input; a modulator-demodulator (modem) configured to receive the voltage difference signal and generate an output signal; and a voltage driver configured to modulate a voltage across the two terminals of the integrated circuit according to the output signal from the modem while maintaining the current flowing between the two terminals of the integrated circuit; wherein the output signal from the modem is configured to cause the voltage driver to modulate the voltage across the two terminals of the integrated circuit to encode data according to the Highway Addressable Remote Transducer (HART) protocol.