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US 7,888,962 B1Granted
Impedance matching circuit
AssigneeCypress Semiconductor Corporation
InventorHari Om
Life of this patent
Estimating the term…
Abstract
An impedance matching circuit has a reference impedance. A comparator has a first input coupled to a terminal of the reference impedance and has an output. A pull-up counter is coupled to the output of the single comparator.
Claims13
An impedance matching circuit comprising:
- a reference impedance;
- a comparator having a first input coupled to a terminal of the reference impedance having an output and a second input of the comparator coupled to a constant reference voltage;
- a pull-up counter coupled to an output of the comparator;
- a pull-up array having a first terminal coupled to a power supply voltage and a second terminal coupled to the terminal of the reference impedance and the first input of the comparator;
- and a pull-down array having a first terminal coupled to a ground and a second terminal coupled to the first input of the single comparator.
2 more elements
An impedance matching circuit comprising:
- a reference impedance having a first terminal coupled to a ground;
- a comparator having a first input coupled to a second terminal of the reference impedance and a second input coupled to a constant reference voltage;
- a counter/register coupled to an output of the comparator, wherein the counter/register includes a pull-up counter register and a pull-down counter register;
- and
- a first switch between the output of the comparator and the pull-up counter register.
2 more elements
An impedance matching input buffer comprising:
- an impedance matching circuit having a reference impedance and a comparator having a constant reference voltage as an input to the comparator;
- a pull-up array coupled to a pull-down array and an input signal, the pull-up array receiving an impedance matching signal from the impedance matching circuit;
- and
- an input buffer having an input coupled to the pull-up array, the pull-down array and the input signal,
- wherein the impedance matching circuit has a pull-up counter/register coupled to an output of the comparator and a pull-down counter/register coupled to the output of the comparator.
2 more elements
Dependencies are inferred from the claim text.