US 12,224,720 B2
Radio frequency amplifier and bias circuit
Shun-Nan Tai, Taipei (TW); and Yao Hui Chiang, Taipei (TW)
Assigned to RichWave Technology Corp., Taipei (TW)
Filed by RichWave Technology Corp., Taipei (TW)
Filed on Sep. 14, 2021, as Appl. No. 17/474,055.
Claims priority of application No. 110118870 (TW), filed on May 25, 2021.
Prior Publication US 2022/0385245 A1, Dec. 1, 2022
Int. Cl. H03F 3/19 (2006.01); H03F 1/56 (2006.01)
CPC H03F 3/19 (2013.01) [H03F 1/565 (2013.01); H03F 2200/222 (2013.01); H03F 2200/387 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency amplifier, comprising:
an amplifier, comprising an input terminal configured to receive an incoming radio frequency signal through a first radio frequency path;
a first inductive-capacitive resonance circuit, comprising a first terminal configured to be coupled to a first reference voltage, wherein a second terminal of the first inductive-capacitive resonance circuit is coupled to the first radio frequency path, and wherein in response to the first reference voltage being at a first reference level, the radio frequency amplifier is enabled, and in response to the first reference voltage being at a second reference level, the radio frequency amplifier is disabled; and
a first bias circuit, comprising a first terminal configured to be coupled to the first reference voltage, wherein a second terminal of the first bias circuit is directly coupled to the input terminal of the amplifier to provide a first direct current component.