To keep high efficiency against high-frequency signals having wide-band envelopes.
The envelope tracking power supply circuit 5 generates an output voltage based on an envelope of the high-frequency signal. The circuit has a voltage follower circuit 7, which receives an envelope signal, and outputs a voltage based on the envelope signal SE, two parallel resistors Rsense connected in parallel between an output of the voltage follower circuit 7 and an output terminal PO, hysteresis comparators 9a and 9b which detect each voltage drop in the parallel resistors Rsense to generate a voltage based on the voltage drop, and switching converters 11a and 11b which make switching based on the voltage output from each of the hysteresis comparators 9a and 9b, to output a voltage to the output terminal PO.
KANEDA MASATO
KOBAYASHI HARUO
HIRATA HITOSHI
SHIMURA TATSUHIRO
| JP2003533116A | 2003-11-05 | |||
| JP2007531488A | 2007-11-01 | |||
| JP2003533116A | 2003-11-05 | |||
| JP2007531488A | 2007-11-01 |
Shiro Terasaki
Yoshiki Kuroki
Ichira Kondo
Yuji Suwa