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Blocker detection based automatic gain control

一种阻断器、控制信号的技术，应用在增益控制、放大的控制、传输监控等方向

Active Publication Date: 2017-07-25
ANALOG DEVICES INT UNLTD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Achieving proper blocking inhibition of this blocking signal is challenging

Method used

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  • Blocker detection based automatic gain control
  • Blocker detection based automatic gain control
  • Blocker detection based automatic gain control

Examples

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Embodiment Construction

[0019] Various aspects of the novel systems, devices and methods are described more fully hereinafter with reference to the accompanying drawings. Aspects of the disclosure may, however, be embodied in many different forms and should not be construed as limited to any specific structure or function presented throughout this disclosure. Rather, these aspects are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Based on the teachings herein one skilled in the art should appreciate that the scope of the present disclosure is intended to cover any aspect of the novel systems, devices and methods disclosed herein, whether implemented independently or in combination with any other aspects. For example, an apparatus may be implemented or a method may be implemented using any number of the aspects set forth herein. Furthermore, the scope is intended to include devices and / or methods practice...

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Abstract

Modular gain control based on blocker signal detection is disclosed herein. In a multi-stage gain control scheme for a receiver, the input stage gain or the pre-mixing stage gain can be controlled for effective blocker rejection based on detecting a blocker signal at a mixer, and the output stage gain or the post-mixing stage gain can be controlled to restore and maintain an appropriate output level after pre-mixing gain reduction performed for blocker rejection. Accordingly, the RF communication systems herein can include multiple loops for providing AGC. In particular, an RF communication system can include a main loop and a blocker loop used to override the main loop when the blocker signal is detected. In certain configurations, the blocker loop reduces the gain of an RF VGA, while the main loop will increase the gain of an IF VGA to restore the output power.

Description

technical field [0001] Embodiments of the present invention relate to electronic systems, and more particularly to automatic gain control for radio frequency communication systems. Background technique [0002] Automatic gain control (AGC) can be used in a variety of applications, including radio frequency (RF) communication systems. AGC can be implemented using a variable gain amplifier (VGA) in a loop, such as a feedback or feedforward AGC loop. [0003] For example, an RF communication system may include a feedback AGC loop that adjusts the VGA control voltage with reference to a reference voltage. The presence of blocking or cutoff frequency signals near the receiver of an RF communication system can affect gain and signal-to-noise ratio (SNR). Achieving proper blocking inhibition of this blocking signal is challenging. Contents of the invention [0004] The methods and apparatus of the described technology each have several aspects, no single one of which is solely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30
CPCH03G3/3036H03G3/3068H04B1/109H04B17/345H04B1/0475H04B2001/0416
Inventor A·M·A·欧斯曼
Owner ANALOG DEVICES INT UNLTD CO
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