US 11,152,919 B1 · Mathematical function circuit

Abstract

An example of an apparatus includes a bias circuit having first and second bias circuit outputs. The apparatus also includes a comparator having first and second comparator inputs. The apparatus also includes a first capacitor coupled between the second comparator input and the second bias circuit output. The apparatus also includes a first switch coupled between the second comparator input and the second bias circuit output. The apparatus also includes a second switch coupled between the first bias circuit output and an input terminal, a third switch coupled between the input terminal and the first comparator input, and a fourth switch coupled between the first bias circuit output and the first comparator input. The apparatus also includes a second capacitor coupled between the first comparator input and the second bias circuit output.

Claims20

Dependent claims

An apparatus, comprising:

a bias circuit having first and second bias circuit outputs;
a comparator having first and second comparator inputs;
a first capacitor coupled between the second comparator input and the second bias circuit output;
a first switch coupled between the second comparator input and the second bias circuit output;
a second switch coupled between the first bias circuit output and an input terminal;
a third switch coupled between the input terminal and the first comparator input;
a fourth switch coupled between the first bias circuit output and the first comparator input;
and
a second capacitor coupled between the first comparator input and the second bias circuit output.

6 more elements

An apparatus, comprising:

a first input sensing circuit configured to sense a value of a first input voltage and provide a first current that is proportional to the value of the first input voltage;
a second input sensing circuit configured to sense a value of a second input voltage and provide a second current that is proportional to the value of the second input voltage;
and
a comparison circuit configured to:
initialize first and second capacitors with respective bias values;
charge the first capacitor according to the first current;
discharge the second capacitor according to the second current;
and
sample a value across the first capacitor responsive to the value across the first capacitor being equal to or greater than a value across the second capacitor.

6 more elements

Dependencies are inferred from the claim text.

Mathematical function circuit

Life of this patent

Mathematical function circuit

Life of this patent

Abstract

Claims20