Patent ID: 9544027
Date: 2017-01-10
CPC Classifications: H04B

Claim:
1. A loop-powered transmitter, comprising: a data isolation transformer including a primary winding and a secondary winding; an analog-to-digital converter (ADC) to convert a sensor signal to a digital value, the ADC including a multi-signal interface; and a first microcontroller coupled between the multi-signal interface of the ADC and only one tap of the primary winding of the data isolation transformer; a second microcontroller coupled to a tap of the secondary winding of the data isolation transformer, the second microcontroller having a multi-signal interface output; a digital-to-analog converter (DAC) having a digital input and a power input, the digital input connecting to the digital multi-signal interface output of the second microcontroller; a second unipolar voltage converter coupled to a primary winding of a power isolation transformer and to the power input of the DAC.