초록

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.

대표청구항 ▼

What is claimed is: 1. 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 ou

What is claimed is: 1. 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.