US 11,856,358 B1
Phantom powered FET circuit for audio application
Rodger Cloud, Tucson, AZ (US); and Stephen Sank, Tucson, AZ (US)
Assigned to Cloud Microphones, LLC., Tucson, AZ (US)
Filed by Cloud Microphones, LLC., Tucson, AZ (US)
Filed on Nov. 23, 2021, as Appl. No. 17/533,117.
Application 13/854,839 is a division of application No. 12/901,522, filed on Oct. 9, 2010, granted, now 8,433,090, issued on Apr. 30, 2013.
Application 17/533,117 is a continuation of application No. 16/929,458, filed on Jul. 15, 2020, granted, now 11,190,869.
Application 16/929,458 is a continuation of application No. 16/438,262, filed on Jun. 11, 2019, granted, now 10,721,552, issued on Jul. 21, 2020.
Application 16/438,262 is a continuation of application No. 15/796,725, filed on Oct. 27, 2017, granted, now 10,356,507, issued on Jul. 16, 2019.
Application 15/796,725 is a continuation of application No. 14/887,082, filed on Oct. 19, 2015, granted, now 9,888,315, issued on Feb. 6, 2018.
Application 14/887,082 is a continuation of application No. 13/854,839, filed on Apr. 1, 2013, granted, now 9,167,327, issued on Oct. 20, 2015.
Claims priority of provisional application 61/250,001, filed on Oct. 9, 2009.
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 1/22 (2006.01); H04R 1/08 (2006.01); H04R 3/00 (2006.01); H04R 9/02 (2006.01); H04R 9/04 (2006.01); H04R 1/28 (2006.01)
CPC H04R 1/222 (2013.01) [H04R 1/083 (2013.01); H04R 3/00 (2013.01); H04R 9/025 (2013.01); H04R 9/048 (2013.01); H04R 1/08 (2013.01); H04R 1/2876 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A phantom-powered transistor preamplifier gain circuit for a microphone or a musical instrument utilized in an audio application, the phantom-powered transistor preamplifier gain circuit comprising:
a first transistor having its gate terminal coupled to a first signal input terminal, which is configured to receive at least one sound source signal;
a second transistor coupled to a first signal output terminal, wherein the second transistor is also coupled in cascode to the first transistor and is powered by an external phantom power supply;
a third transistor having its gate terminal coupled to a second signal input terminal, which is configured to receive the at least one sound source signal; and
a fourth transistor coupled to a second signal output terminal, wherein the fourth transistor is coupled in cascode to the third transistor and is powered by the external phantom power supply.