US 12,191,831 B2
Amplifying device having high input impedance
Junyoung Park, Seoul (KR); and Suhwan Kim, Seoul (KR)
Assigned to Seoul National University R&DB Foundation, Seoul (KR)
Filed by Seoul National University R&DB Foundation, Seoul (KR)
Filed on Feb. 3, 2022, as Appl. No. 17/592,274.
Claims priority of application No. 10-2021-0017462 (KR), filed on Feb. 8, 2021.
Prior Publication US 2022/0255517 A1, Aug. 11, 2022
Int. Cl. H03F 1/02 (2006.01); H03F 1/26 (2006.01); H03F 3/45 (2006.01)
CPC H03F 3/45475 (2013.01) [H03F 1/26 (2013.01); H03F 2200/261 (2013.01); H03F 2203/45512 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An amplifying device comprising:
a main amplifier;
a first feedback circuit coupled between an input terminal of the main amplifier and an output terminal of the main amplifier;
an input coupling circuit coupled between the input terminal of the main amplifier and a first node; and
an amplifying feedback circuit coupled between the output terminal of the main amplifier and the first node,
wherein the first feedback circuit and the amplifying feedback circuit are negative feedback circuits, and
wherein the amplifying feedback circuit includes:
a feedback amplifier;
a feedback output capacitor coupled between an output terminal of the feedback amplifier and the first node;
a feedback input capacitor coupled between an input terminal of the feedback amplifier and the output terminal of the main amplifier; and
an amplifying feedback capacitor coupled between the input terminal of the feedback amplifier and the output terminal of the feedback amplifier.