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

Claim 0:
1. 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 adjustable current mirror array circuit comprises:
a reference voltage generator, generating a first reference voltage and a second reference voltage;
a level shift circuit, shifting levels of the control bits to generate a plurality of first bits and a plurality of second bits, and generating a plurality of third bits and a plurality of fourth bits based on the control bits,
wherein a corresponding one among the first bits and a corresponding one among the second bits have different logical values, and a corresponding one among the third bits and a corresponding one among the fourth bits have different logical values; and
a current mirror circuit, biased by the first reference voltage and the second reference voltage, and controlled by the first bits, the second bits, the third bits and the fourth bits to generate the first current and the second current.