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

• Main Authors: KOBAYASHI HARUO, SHIMURA TATSUHIRO, HIRATA HITOSHI, KANBE AKIHIRO, KANEDA MASATO
• Format: Patent
• Language: English
• Published: 20.08.2009
• Subjects: AMPLIFIERS; APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; BASIC ELECTRONIC CIRCUITRY; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

PROBLEM TO BE SOLVED: To keep high efficiency against high-frequency signals having wide-band envelopes. SOLUTION: 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 Rsenseconnected 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 Rsenseto 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. COPYRIGHT: (C)2009,JPO&INPIT