US 9,813,025 B2
Apparatus and method for power supply modulation
Zhancang Wang, Beijing (CN)
Assigned to Nokia Technologies Oy, Espoo (FI)
Appl. No. 15/27,814
Filed by Nokia Technologies Oy, Espoo (FI)
PCT Filed Oct. 8, 2013, PCT No. PCT/CN2013/084841
§ 371(c)(1), (2) Date Apr. 7, 2016,
PCT Pub. No. WO2015/051494, PCT Pub. Date Apr. 16, 2015.
Prior Publication US 2016/0254785 A1, Sep. 1, 2016
Int. Cl. H03G 3/20 (2006.01); H03F 1/02 (2006.01); H03F 3/195 (2006.01); H03F 3/24 (2006.01); H03F 3/193 (2006.01); H04W 52/02 (2009.01); H04W 52/28 (2009.01); H04W 52/52 (2009.01)
CPC H03F 1/0222 (2013.01) [H03F 3/193 (2013.01); H03F 3/195 (2013.01); H03F 3/245 (2013.01); H04W 52/0212 (2013.01); H04W 52/283 (2013.01); H04W 52/52 (2013.01); H03F 2200/102 (2013.01); H03F 2200/451 (2013.01); H03F 2200/555 (2013.01); Y02B 60/50 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An apparatus for amplifying a radio frequency transmission signal, the apparatus comprising:
an envelope signal obtaining unit configured to obtain a slow envelope signal indicating a time averaging amplitude component of the radio frequency transmission signal and a fast envelope signal indicating an instant amplitude component of the radio frequency transmission signal;
a supply voltage modulating unit configured to provide an output modulated supply voltage to the power amplifying unit by modulating a direct current supply voltage based on both the synchronous slow envelope signal and the fast envelope signal,
wherein the supply voltage modulating unit further comprises a slow modulator and a fast modulator synchronously,
wherein the slow modulator is supplied with the direct current supply voltage and configured to provide a first intermediate supply voltage to the fast modulator by modulating the direct current supply voltage synchronously based on the slow envelope signal; and
a power amplifying unit configured to amplify power of the radio frequency transmission signal according to the output modulated supply voltage.