US 9,810,583 B2
Encoder circuit with feedback DAC
Gabriele Bernardinis, Los Gatos, CA (US)
Assigned to Analog Devices, Inc., Norwood, MA (US)
Filed by Analog Devices, Inc., Norwood, MA (US)
Filed on Sep. 23, 2013, as Appl. No. 14/33,917.
Claims priority of provisional application 61/824,809, filed on May 17, 2013.
Prior Publication US 2014/0341257 A1, Nov. 20, 2014
Int. Cl. G01K 7/01 (2006.01); G01D 5/245 (2006.01)
CPC G01K 7/01 (2013.01) [G01D 5/2454 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A sensing system for providing a digital output signal based on analog signals from multiple sensors, the sensing system comprising:
a digitizing encoder circuit having first and second encoder inputs and an encoder output;
a first sensing circuit configured to provide a first analog signal to the first encoder input; and
a second sensing circuit configured to provide a second analog signal to the first encoder input;
wherein the digitizing encoder circuit is coupled to the first sensing circuit and to the second sensing circuit, and the digitizing encoder circuit is configured to encode the first analog signal or the second analog signal into a digital signal, and
wherein the digitizing encoder circuit includes a feedback path with a digital-to-analog converter (DAC) circuit configured to receive an encoder output signal from the encoder output and, in response, provide an analog offset voltage signal at the second encoder input of the digitizing encoder circuit, wherein the offset voltage signal is based on one of the first analog signal from the first sensing circuit and the second analog signal from the second sensing circuit.