Invention Grant
- Patent Title: AM to PM correction system for polar modulator
- Patent Title (中): AM到极化调制器的PM校正系统
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Application No.: US10147569Application Date: 2002-05-16
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Publication No.: US07991071B2Publication Date: 2011-08-02
- Inventor: Alexander Wayne Hietala
- Applicant: Alexander Wayne Hietala
- Applicant Address: US NC Greensboro
- Assignee: RF Micro Devices, Inc.
- Current Assignee: RF Micro Devices, Inc.
- Current Assignee Address: US NC Greensboro
- Agency: Withrow & Terranova, P.L.L.C.
- Main IPC: H04L25/49
- IPC: H04L25/49 ; H04B15/00 ; H04B1/10
Abstract:
A transmitter includes a polar modulator that creates phase and amplitude signals which in turn drive a power amplifier. To compensate for AM to PM conversion of the amplitude signal into the amplified signal, a compensation signal is generated from the amplitude signal and combined with the phase signal such that when amplified, the compensation signal cancels the AM to PM conversion. The compensation signal may have an offset term, a linear term, a quadratic term, and a cubic term. A second embodiment comprises a technique by which AM to AM conversion may concurrently be addressed using a second compensation signal.
Public/Granted literature
- US07813446B2 AM to PM correction system for polar modulator Public/Granted day:2010-10-12
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