US 12,656,381 B2 · Systems and methods for duty cycle measurement

Abstract

Systems, methods, and circuits for determining a duty cycle of a periodic input signal are provided. A delay element is configured to delay the periodic input signal based on a digital control word. A digital circuit is configured to generate a first digital control word used to delay the periodic input signal a first amount of time corresponding to a period of the periodic input signal, generate a second digital control word used to delay the periodic input signal a second amount of time corresponding to a portion of the periodic input signal having a logic-level high value, and generate a third digital control word used to delay the periodic input signal a third amount of time corresponding to a portion of the periodic input signal having a logic-level low value. A controller is configured to determine the duty cycle based on the first, second, and third digital control words.

Claims20

Dependent claims

A method for outputting a duty cycle value of a periodic input signal, the method comprising:

dividing the periodic input signal to generate a divided version of the periodic input signal;
generating a first digital control word responsive to the divided version of the periodic input signal and used to delay the periodic input signal a first amount of time such that a duration of a high or low portion of a period of a first delayed version of the periodic input signal is substantially equal to a total duration of high and low portions of a period of the periodic input signal;
generating a second digital control word used to delay the periodic input signal a second amount of time corresponding to a portion of the period that the periodic input signal has a logic-level high value;
and
outputting a value of a duty cycle of the periodic input signal that is based on the first digital control word and the second digital control word.

2 more elements

A circuit comprising:

a digital circuit configured to;
generate a first digital control word used to delay a periodic input signal a first amount of time such that a duration of a high or low portion of a period of a first delayed version of the periodic input signal is substantially equal to a total duration of high and low portions of a period of the periodic input signal;
and
generate a second digital control word used to delay the periodic input signal a second amount of time corresponding to a portion of the period that the periodic input signal has a logic-level high value;
a delay element configured to generate a second delayed version of the periodic input signal such that a duration of a low portion of the second delayed version of the periodic input signal is substantially equal to a duration of a high portion of the periodic input signal;
and
a controller configured to calculate a value of a duty cycle of the periodic input signal based on the first and second digital control words.

4 more elements

Dependencies are inferred from the claim text.

Systems and methods for duty cycle measurement

Life of this patent

Systems and methods for duty cycle measurement

Life of this patent

Abstract

Claims20