US 9,813,036 B2
Dynamic loadline power amplifier with baseband linearization
Andrew F. Folkmann, Cedar Rapids, IA (US); and Ramon Antonio Beltran Lizarraga, Thousand Oaks, CA (US)
Assigned to Qorvo US, Inc., Greensboro, NC (US)
Filed by RF Micro Devices, Inc., Greensboro, NC (US)
Filed on Dec. 14, 2012, as Appl. No. 13/714,600.
Claims priority of provisional application 61/576,520, filed on Dec. 16, 2011.
Prior Publication US 2013/0154729 A1, Jun. 20, 2013
Int. Cl. H03G 3/20 (2006.01); H03F 3/189 (2006.01); H03F 3/68 (2006.01); H03F 1/02 (2006.01); H03F 3/72 (2006.01); H03G 3/30 (2006.01)
CPC H03G 3/20 (2013.01) [H03F 1/0288 (2013.01); H03F 3/189 (2013.01); H03F 3/68 (2013.01); H03F 3/72 (2013.01); H03G 3/3042 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A radio frequency (RF) amplification device comprising:
a Doherty amplifier configured to amplify an RF signal, wherein the Doherty amplifier comprises a main RF amplification circuit and a peaking RF amplification circuit; and
a control circuit configured to:
receive an instantaneous power indication signal having an instantaneous power indication signal level indicative of a signal level of the RF signal;
generate a gain control signal having a gain control signal level, wherein the gain control signal level above an activation level is in response to the instantaneous power indication signal level of the instantaneous power indication signal reaching a power threshold level; and
provide the gain control signal to the peaking RF amplification circuit, wherein:
the peaking RF amplification circuit is configured to be activated in response to the gain control signal level being above the activation level; and
the peaking RF amplification circuit is configured to provide amplification in accordance with a peaking amplifier gain that is set based on the gain control signal level of the gain control signal.