US 11,699,978 B2
Doherty radio frequency amplifier circuitry
Baker Scott, San Jose, CA (US); George Maxim, Saratoga, CA (US); and Dirk Robert Walter Leipold, San Jose, CA (US)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Filed by Qorvo US, Inc., Greensboro, NC (US)
Filed on Apr. 12, 2021, as Appl. No. 17/228,138.
Application 17/228,138 is a continuation of application No. 16/436,252, filed on Jun. 10, 2019, granted, now 10,978,999.
Claims priority of provisional application 62/683,309, filed on Jun. 11, 2018.
Prior Publication US 2021/0305942 A1, Sep. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H03F 1/07 (2006.01); H03F 1/02 (2006.01); H03F 3/19 (2006.01); H03G 3/30 (2006.01); H03F 1/56 (2006.01); H03F 1/32 (2006.01)
CPC H03F 1/0288 (2013.01) [H03F 1/32 (2013.01); H03F 1/56 (2013.01); H03F 3/19 (2013.01); H03G 3/3036 (2013.01); H03F 2200/102 (2013.01); H03F 2200/222 (2013.01); H03F 2200/451 (2013.01); H03G 2201/307 (2013.01)] 20 Claims
OG exemplary drawing
 
1. Doherty radio frequency (RF) amplifier circuitry comprising:
an input coupler configured to receive one or more RF input signals;
an output coupler configured to output one or more RF output signals;
a main amplifier path between the input coupler and the output coupler, the main amplifier path comprising a main amplifier;
a peaking amplifier path between the input coupler and the output coupler, the peaking amplifier path comprising:
a peaking amplifier; and
a peaking variable gain preamplifier between the input coupler and the peaking amplifier, the peaking variable gain preamplifier configured to adjust a current provided to the peaking amplifier; and
control circuitry configured to adjust a gain of the peaking variable gain preamplifier to compensate for parasitic impedance of the main amplifier and the peaking amplifier.