Complete digital logarithm automatic gain control device and method

An automatic gain control and all-digital technology, which is applied in the field of signal processing, can solve problems such as increasing system complexity, occupying large system resources, and reducing system stability. Effect

Inactive Publication Date: 2008-09-03
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the previous automatic gain control circuit, the signal power is extracted by down-conversion. This method will occupy a large amount of system resources in actual engineering, increase the complexity of the system, and reduce the stability of the system.

Method used

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  • Complete digital logarithm automatic gain control device and method
  • Complete digital logarithm automatic gain control device and method
  • Complete digital logarithm automatic gain control device and method

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Experimental program
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Embodiment Construction

[0028] Such as figure 1 As shown, the controllable gain amplifier in the all-digital logarithmic automatic gain control device is sequentially connected with a phase shifter, a power detector, a logarithmic converter, a comparator, an integrator, an exponential converter, and a controllable gain amplifier.

[0029] Such as figure 2 As shown, the internal module connection relationship between the phase shifter and the power detector is as follows: the (90+n) degree phase shifter is connected to the first squarer and the first adder in turn, and the n degree phase shifter is connected to the second squarer in turn device and the first adder are connected. The phase shifter is an infinite impulse response IIR phase shifter, so that the relative phase deviation between the two output signals is 90 degrees, so as to obtain the I and Q components of the IF input signal. In the past, the I and Q components of the signal were obtained by down-conversion. However, the down-conversi...

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Abstract

The invention discloses an all-digital logarithm automatic gain control device and a method thereof. A phase shifter extracts an equidirectional branch data I and a quadrature branch data Q of instantaneous outcoming signal, then a power detector obtains the power of outcoming signal, a logarithmic converter performs the linearizing process to the outcoming signal, compares the results with a system preset parameter b to form an error signal, finally an integrator removes the high-frequency component, an index converter performs the reverse-linearizing process to the error signal, a controllable gain amplifier forms a feedback loop. When the outcoming signal power is larger than the preset value,the gain of the controllable gain amplifier is reduced, and when the outcoming signal power is smaller than the preset value,t he gain of the controllable gain amplifier is enhanced, therefore outputting the digit signal with constant power. The invention avoids the limiting amplitude distortion, considerably reduces the complexity of back-end digital signal processing, enhances the anti-interference and stability of the system and effectively reduces the consumption of hardware system resources.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to an all-digital logarithmic automatic gain control device and method. Background technique [0002] With the development of wireless communication technology, we expect more and more signal processing to be converted from the analog domain to the digital domain. In this way, device size and power consumption can be reduced, cost can be reduced, reliability and flexibility can be improved. The ideal all-digital signal processing technology requires that the digitization of analog signals be completed at the radio frequency end RF, thereby completely eliminating analog devices. However, the current technical level is difficult to achieve this goal. [0003] Therefore, in engineering, we first reduce the radio frequency signal RF to the intermediate frequency signal IF, then perform analog-to-digital conversion ADC on the intermediate frequency signal, and finally perform signal pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H03G3/20G06F1/03
Inventor 张翔李式巨杨志敏施振吴赵晓宇彭曦周侨赵辉张迪杜维江国范
Owner ZHEJIANG UNIV
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