发明授权
US09031520B2 Transmitter and method with RF power amplifier having control loop stabilized bias
有权
具有RF功率放大器的发射机和方法具有控制环路稳定的偏置
- 专利标题: Transmitter and method with RF power amplifier having control loop stabilized bias
- 专利标题(中): 具有RF功率放大器的发射机和方法具有控制环路稳定的偏置
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申请号: US13940042申请日: 2013-07-11
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公开(公告)号: US09031520B2公开(公告)日: 2015-05-12
- 发明人: Ronald Duane McCallister
- 申请人: CrestCom, Inc.
- 申请人地址: US AZ Scottsdale
- 专利权人: CrestCom, Inc.
- 当前专利权人: CrestCom, Inc.
- 当前专利权人地址: US AZ Scottsdale
- 代理机构: Schmeiser, Olsen & Watts LLP
- 代理商 Lowell W. Gresham
- 主分类号: H04B1/04
- IPC分类号: H04B1/04
摘要:
A transmitter (32) generates a time-varying stabilized bias signal (82) from which an amplifier-generated, sub-RF distortion signal (26) has been canceled. The distortion signal (26) is a byproduct of amplification and is generated due to imperfect linearity and/or other characteristics of a linear RF power amplifier (36). An envelope amplifier (84) includes a high bandwidth differential input, linear, bias signal amplifier (120) and a low bandwidth switching amplifier (122) coupled together to achieve both a high bandwidth and high efficiency. A control loop (154) feeds a portion of the voltage V(t) from a conduction node (146) of the RF power amplifier (36) to one of the differential inputs of the linear bias signal amplifier (120), while a bias control signal (92) drives the other differential input. The portion of voltage V(t) fed to bias signal amplifier (120) is a low power portion from which the RF portion has been removed.
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