US 11,716,062 B2
Multi-channel common-mode coupled AC gain amplifier
Paul Allen, Saratoga Springs, UT (US)
Assigned to Owlet Baby Care, Inc., Lehi, UT (US)
Filed by Owlet Baby Care, Inc., Lehi, UT (US)
Filed on Aug. 9, 2021, as Appl. No. 17/397,042.
Claims priority of provisional application 63/065,197, filed on Aug. 13, 2020.
Prior Publication US 2022/0052661 A1, Feb. 17, 2022
Int. Cl. H03F 3/45 (2006.01); H03G 3/10 (2006.01); H03G 3/00 (2006.01); H03F 3/68 (2006.01)
CPC H03F 3/45636 (2013.01) [H03F 3/68 (2013.01); H03G 3/008 (2013.01); H03G 3/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A multi-channel common-mode coupled alternating current (AC) gain amplifier (MC-CM-AC Amp) comprising:
a first operational amplifier including:
a first non-inverting input port configured to be coupled to a first input signal;
a first inverting input port configured to be coupled to a first capacitor;
a second operational amplifier including:
a second non-inverting input port configured to be coupled to a second input signal;
a second inverting input port configured to be coupled to a second capacitor; and
one or more gain-setting resistors configured to be coupled between the first capacitor and the second capacitor;
wherein the one or more gain-setting resistors is configured to amplify an alternating current (AC) component of the first input signal or the second input signal without amplifying a direct current (DC) component of the first input signal or the second input signal.