Patent ID: 11881847
Assignee: MEDIATEK INC.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A post driver, comprising:
a pull-up circuit, having a plurality of p-channel metal-oxide-semiconductor transistors coupled in series between an overdrive voltage source and an output terminal of the post driver, wherein a first p-channel metal-oxide-semiconductor transistor has a drain terminal coupled to the output terminal of the post driver;
a pull-down circuit, having a plurality of n-channel metal-oxide-semiconductor transistors coupled in series between the output terminal of the post driver and a ground terminal, wherein a first n-channel metal-oxide-semiconductor transistor has a drain terminal coupled to the output terminal of the post driver;
a first bias circuit, configured to provide a first voltage shift between the output terminal of the post driver and a gate terminal of the first p-channel metal-oxide-semiconductor transistor when the pull-down circuit is enabled, to increase a voltage level at the gate terminal of the first p-channel metal-oxide-semiconductor transistor when the pull-down circuit is enabled;
a second bias circuit, configured to provide a second voltage shift between the output terminal of the post driver and a gate terminal of the first n-channel metal-oxide-semiconductor transistor when the pull-up circuit is enabled, to decrease a voltage level at the gate terminal of the first n-channel metal-oxide-semiconductor transistor when the pull-up circuit is enabled;
a third n-channel metal-oxide-semiconductor transistor, having a gate terminal coupled to a source terminal of the first p-channel metal-oxide-semiconductor transistor, a drain terminal biased by a protection voltage, and a source terminal coupled to the gate terminal of the first p-channel metal-oxide-semiconductor transistor; and
a third p-channel metal-oxide-semiconductor transistor, having a gate terminal coupled to a source terminal of the first n-channel metal-oxide-semiconductor transistor, a drain terminal biased by a nominal voltage of the post driver, and a source terminal coupled to the gate terminal of the first n-channel metal-oxide-semiconductor transistor.