US 11,916,563 B2
Analog-to-digital converter, sensor processing circuit, and sensor system
Jun'Ichi Naka, Osaka (JP); Koji Obata, Osaka (JP); Junji Nakatsuka, Osaka (JP); Hiroki Yoshino, Nara (JP); and Masaaki Nagai, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/427,061
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Mar. 9, 2020, PCT No. PCT/JP2020/010049
§ 371(c)(1), (2) Date Jul. 29, 2021,
PCT Pub. No. WO2020/195754, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 2019-065095 (JP), filed on Mar. 28, 2019.
Prior Publication US 2022/0123757 A1, Apr. 21, 2022
Int. Cl. H03M 1/12 (2006.01); H03M 1/06 (2006.01)
CPC H03M 1/0626 (2013.01) 6 Claims
OG exemplary drawing
 
1. A sensor processing circuit comprising:
a sensor;
an input part that receives an analog signal output from a signal output part of the sensor;
an analog-to-digital conversion part that digitally converts the analog signal to generate first digital data and second digital data;
a first output part that outputs the first digital data to a control circuit; and
a second output part that outputs the second digital data to the signal output part before the first output part outputs the first digital data, wherein:
the second digital data has a smaller bit number than the first digital data,
the analog-to-digital conversion part includes a first analog-to-digital converter and a second analog-to-digital converter connected in series,
the second analog-to-digital converter is provided at a preceding stage of the first analog-to-digital converter and generates the second digital data,
the second output part outputs the second digital data generated by the second analog-to-digital converter to a sensor as the signal output part,
the sensor receives the second digital data, and
the sensor is an acceleration sensor, a gyro sensor or a motion sensor.