US 12,422,461 B2
Method to measure high voltages accurately
Sanjay Rajasekhar, Newbury (GB)
Assigned to Analog Devices International Unlimited Company, Limerick (IE)
Filed by Analog Devices International Unlimited Company, Limerick (IE)
Filed on Oct. 5, 2023, as Appl. No. 18/481,646.
Prior Publication US 2025/0116689 A1, Apr. 10, 2025
Int. Cl. G01R 19/257 (2006.01); G01R 15/04 (2006.01); G01R 19/25 (2006.01)
CPC G01R 19/257 (2013.01) [G01R 15/04 (2013.01); G01R 19/2506 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A monitoring circuit comprising:
a digital to analog converter (DAC) circuit to produce a DAC output level at an output of the DAC circuit;
a reference circuit configured to produce multiple reference levels;
a resistive divider circuit including a first terminal coupled to the output of the DAC circuit, a second terminal coupled to the reference circuit, and an output terminal to provide a measurement voltage; and
a measurement circuit configured to:
apply a first reference level to the second terminal of the resistive divider circuit and measure a first measurement voltage at the output terminal of the resistive divider circuit;
apply a second reference level to the second terminal of the resistive divider circuit and measure a second measurement voltage at the output terminal of the resistive divider circuit; and
calculate the DAC output level using the first and second reference levels, and the first and second measurement voltages.