US 12,395,133 B2
Compact low noise amplifier system
Baker Scott, San Jose, CA (US); Mihai Murgulescu, San Jose, CA (US); George Maxim, Saratoga, CA (US); and Padmmasini Desikan, San Jose, CA (US)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Filed by Qorvo US, Inc., Greensboro, NC (US)
Filed on Apr. 22, 2022, as Appl. No. 17/726,651.
Prior Publication US 2023/0344391 A1, Oct. 26, 2023
Int. Cl. H03F 3/19 (2006.01); H03G 3/00 (2006.01); H03G 3/30 (2006.01)
CPC H03F 3/19 (2013.01) [H03G 3/001 (2013.01); H03G 3/3036 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01); H03G 2201/103 (2013.01); H03G 2201/307 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A low-noise amplifier system comprising:
a main amplifier having a main input coupled to a RF input and a main output connected to an RF output, wherein output summation circuitry at a summation node coupled to the RF output is configured to provide magnetic-mode noise cancellation at the summation node; and
an impedance amplifier having an impedance input coupled to the RF input and an impedance output coupled to the RF output, wherein the impedance amplifier is configured to provide input impedance matching to the main amplifier and provide a first noise path that passes through the impedance amplifier such that the noise generated by the impedance amplifier is substantially out of phase with the noise that passes through a second noise path that passes through the main amplifier.