ENVELOPE TRACKING POWER SUPPLY CIRCUIT AND HIGH-FREQUENCY AMPLIFIER INCLUDING ENVELOPE TRACKING POWER SUPPLY CIRCUIT

The invention aims to maintain a high efficiency even for a high-frequency signal having a wideband envelope. The envelope tracking power supply circuit 5 is a power supply circuit for generating an output voltage according to the envelope of a high frequency signal and comprises a voltage follower...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KOBAYASHI HARUO, KANETA MASATO, SHIMURA TATSUHIRO, HIRATA HITOSHI, KANBE AKIHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROLLING PHYSICS REGULATING SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Beschreibung
Zusammenfassung:	The invention aims to maintain a high efficiency even for a high-frequency signal having a wideband envelope. The envelope tracking power supply circuit 5 is a power supply circuit for generating an output voltage according to the envelope of a high frequency signal and comprises a voltage follower circuit 7 for receiving an envelope signal and outputting a voltage according to the envelope signal SE; two parallel resistors Rsense connected in parallel between the output of the voltage follower circuit 7 and an output terminal PO; hysteresis comparators 9a, 9b for detecting respective voltage drops in the parallel resistors Rsense and generating voltages according to the voltage drops; and switching converters 11a, 11b for performing switching according to the respective voltages outputted from the hysteresis comparators 9a, 9b and outputting a voltage to the output terminal PO.