Invention Grant
- Patent Title: Transmitter utilizing a duty cycle envelope reduction and restoration modulator
- Patent Title (中): 发射机利用占空比包络减少和恢复调制器
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Application No.: US12508464Application Date: 2009-07-23
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Publication No.: US08131234B2Publication Date: 2012-03-06
- Inventor: Paul Cheng-Po Liang , Koji Takinami , Toru Matsuura
- Applicant: Paul Cheng-Po Liang , Koji Takinami , Toru Matsuura
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Main IPC: H01Q11/12
- IPC: H01Q11/12 ; H04B1/04
Abstract:
A broad power band transmitter utilizing a duty cycle modulator achieves 80dB of power range for 3G signals. The present invention greatly improves the efficiency of transmitters used in mobile phones, for example, by using the duty cycle modulator during medium and low power levels of the transmitting power amplifier. The power amplifier operates in three different modes based upon the amplifier power level selected. The power amplifier operates in an EER mode during high power levels, in a DCM ERR mode during medium power levels, and in a DCM mode during low power levels.
Public/Granted literature
- US20110018640A1 TRANSMITTER UTILIZING A DUTY CYCLE ENVELOPE REDUCTION AND RESTORATION MODULATOR Public/Granted day:2011-01-27
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