Patent ID: 11899485
Assignee: SIGMASTAR TECHNOLOGY LTD.
Field: Control (Instruments)
Classification: CPC G  H | IPC G  H

Claim 11:
12. A line driver, comprising:
a first resistive component;
a second resistive component, wherein a first terminal of the second resistive component and the first resistive component are coupled to a node, and a second terminal of the second resistive component is coupled to an output terminal;
an operational amplifier, receiving a common mode voltage through the first resistive component, and generating a first signal and a second signal according to the common mode voltage and an input signal; and
an adjustable current mirror array circuit, generating a first current to the node and generating a second current to the output terminal in response to the first signal and the second signal, and adjusting a ratio of the second current to the first current in response to a plurality of control bits so as to set an output impedance of the output terminal,
wherein the output impedance decreases as a ratio of the second current to the first current gets larger.