US 11,901,870 B2
Amplifier
Ming-Hui Tung, Hsinchu (TW); and Shawn Min, Hsinchu (TW)
Assigned to REALTEK SEMICONDUCTOR CORPORATION, Hsinchu (TW)
Filed by Realtek Semiconductor Corporation, Hsinchu (TW)
Filed on Nov. 29, 2021, as Appl. No. 17/536,227.
Claims priority of application No. 110107778 (TW), filed on Mar. 4, 2021.
Prior Publication US 2022/0286102 A1, Sep. 8, 2022
Int. Cl. H03G 3/30 (2006.01); H03F 3/04 (2006.01)
CPC H03G 3/30 (2013.01) [H03F 3/04 (2013.01); H03G 2201/103 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An amplifier, comprising:
an amplifier circuit having a design gain and a real gain and configured to output an output signal according to an input signal and the real gain; and
a gain adjusting circuit coupled to the amplifier circuit and configured to receive the input signal to compare a voltage of the input signal with a first reference voltage;
wherein when the voltage of the input signal exceeds the first reference voltage, the gain adjusting circuit increases the real gain of the amplifier circuit, so that the real gain approach the design gain.