US 12,224,714 B1
Multiple transistor low noise amplifier optimized for cryogenic temperatures
Fawad Maqbool, Bohemia, NY (US)
Assigned to AmpliTech, Inc., Bohemia, NY (US)
Filed by AmpliTech, Inc., Bohemia, NY (US)
Filed on May 17, 2021, as Appl. No. 17/322,517.
Claims priority of provisional application 63/025,811, filed on May 15, 2020.
Int. Cl. H03F 3/68 (2006.01); H03F 1/22 (2006.01); H03F 1/30 (2006.01); H03F 1/56 (2006.01); H03F 3/19 (2006.01); H03F 3/21 (2006.01)
CPC H03F 1/301 (2013.01) [H03F 1/223 (2013.01); H03F 1/565 (2013.01); H03F 3/19 (2013.01); H03F 3/211 (2013.01); H03F 2200/294 (2013.01); H03F 2200/372 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a cooled portion of the apparatus, wherein a cooling device transfers heat away from the cooled portion;
an amplifier circuit assembly that is physically coupled to the cooled portion;
a chamber, wherein an interior of the chamber includes the cooled portion and the amplifier circuit assembly; and
a valve that transitions between an open state and a closed state, wherein an interior pressure in the interior of the chamber is lower than an exterior pressure at an exterior of the chamber based on operation of a vacuum pump that moves gas from the interior of the chamber to the exterior of the chamber through the valve while the valve is in the open state, wherein the interior pressure being lower than the exterior pressure is maintained while the valve is in the closed state.