US 12,113,528 B2
Output driver using feedback network for slew rate reduction and associated output driving method
Huan-Sheng Chen, Hsinchu County (TW)
Assigned to Airoha Technology Corp., Hsinchu (TW)
Filed by Airoha Technology Corp., Hsinchu (TW)
Filed on Jul. 19, 2022, as Appl. No. 17/868,739.
Claims priority of provisional application 63/303,036, filed on Jan. 26, 2022.
Prior Publication US 2023/0238960 A1, Jul. 27, 2023
Int. Cl. H03K 19/003 (2006.01); H03K 19/00 (2006.01); H03K 19/0948 (2006.01)
CPC H03K 19/00346 (2013.01) [H03K 19/0005 (2013.01); H03K 19/0948 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An output driver comprising:
a first pre-driver circuit, arranged to receive a first data input signal to generate a first pre-driving output signal;
a first driver circuit, arranged to receive the first pre-driving output signal to generate a first data output signal;
a second pre-driver circuit, arranged to receive a second data input signal to generate a second pre-driving output signal, wherein the first data input signal and the second data input signal are a differential input of the output driver;
a second driver circuit, arranged to receive the second pre-driving output signal to generate a second data output signal; and
a feedback network, arranged to perform a latching operation upon the first pre-driving output signal and the second pre-driving output signal according to the first data output signal and the second data output signal, wherein the feedback network comprises:
a first feedback path, coupled between an output port of the first driver circuit and an output port of the second pre-driver circuit; and
a second feedback path, coupled between an output port of the second driver circuit and an output port of the first pre-driver circuit, wherein each of the first feedback path and the second feedback path comprises an even number of inverter circuits connected in series.