US 11,852,663 B2
Voltage monitor using a capacitive digital-to-analog converter
Rajat Chauhan, Bangalore (IN); Danielle Griffith, Richardson, TX (US); Per Torstein Roine, Oslo (NO); James Murdock, Richardson, TX (US); and Bernhard Ruck, Freising (DE)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on May 25, 2022, as Appl. No. 17/824,505.
Application 17/824,505 is a continuation of application No. 15/717,219, filed on Sep. 27, 2017, granted, now 11,372,032.
Prior Publication US 2022/0283207 A1, Sep. 8, 2022
Int. Cl. G01R 19/257 (2006.01); H03M 1/66 (2006.01); G01R 31/3835 (2019.01)
CPC G01R 19/257 (2013.01) [G01R 31/3835 (2019.01); H03M 1/66 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A monitoring circuit comprising:
a digital-to-analog converter (DAC) comprising:
a clock input configured to receive a first clock,
a code input configured to receive a binary code,
an analog input configured to receive an input voltage, and
an output configured to provide an analog signal based on the binary code, and the input voltage;
a comparator comprising:
a first input coupled to the output of the DAC to receive the analog signal,
a second input configured to receive a reference voltage,
a clock input configured to receive a second clock having a faster frequency than the first clock, and
an output configured to provide a comparator signal based on the analog signal and the reference voltage; and
a binary code generator having an input coupled to the output of the comparator and an output configured to generate the binary code based on the comparator signal.