US 12,470,182 B2
Class D amplifier driving circuit
Chien-Hao Chiu, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed on Jan. 19, 2023, as Appl. No. 18/099,000.
Claims priority of application No. 111106017 (TW), filed on Feb. 18, 2022.
Prior Publication US 2023/0268892 A1, Aug. 24, 2023
Int. Cl. H03F 3/217 (2006.01); G05F 1/46 (2006.01); H03F 3/185 (2006.01)
CPC H03F 3/2173 (2013.01) [G05F 1/468 (2013.01); H03F 2200/441 (2013.01); H03F 2200/78 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A class D amplifier driving circuit that generates a driving voltage according to an input voltage, the driving voltage being used to drive a class D amplifier, the class D amplifier driving circuit comprising:
a reference voltage generation circuit configured to generate, according to a first reference voltage, a second reference voltage;
a clamping circuit configured to clamp the input voltage;
a low dropout (LDO) linear regulator pre-stage coupled to the reference voltage generation circuit and the clamping circuit and configured to generate an intermediate voltage according to the second reference voltage; and
an LDO linear regulator output stage coupled to the LDO linear regulator pre-stage and configured to generate the driving voltage according to the input voltage and the intermediate voltage.