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Automatic gain adjustment device and its method

An automatic gain adjustment and gain stage technology, applied in the direction of power amplifiers, etc., can solve the problems of serious signal distortion and inability to compensate performance loss, and achieve the effect of compensating system performance loss

Active Publication Date: 2017-08-01
REALTEK SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the power of the input signal is too large and the power amplifier operates in the saturation region, the signal distortion will be very serious, even with the pre-distortion function, it cannot compensate for the loss of performance

Method used

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  • Automatic gain adjustment device and its method
  • Automatic gain adjustment device and its method
  • Automatic gain adjustment device and its method

Examples

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Embodiment Construction

[0047] Figure 2A A schematic diagram showing an automatic gain adjustment device according to an embodiment of the present invention. The automatic gain adjustment device 20 includes a predistortion unit 21 , a gain unit 22 , a mixing circuit MIX, a power amplification unit 23 , an antenna An, an attenuation unit At, a receiving unit 24 , and a calculation unit 25 . The mixing circuit MIX includes a mixing unit MX and a local oscillation unit LO. In one embodiment, the automatic gain adjustment device 20 is disposed in an analog front-end circuit, and the analog front-end circuit transmits signals according to the control of the digital signal processor.

[0048] The pre-distortion unit 21 is coupled to the power amplifying unit 23 , detects the error between the input and output signals of the power amplifying unit 23 , and compensates the distortion of the power amplifying unit 23 . An example, such as Figure 2BAs shown in the upper part, the pre-distortion unit 21 incl...

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Abstract

The invention discloses an automatic gain adjustment device and a method thereof. The automatic gain adjustment device includes a pre-distortion unit, a gain unit, a power amplification unit, a receiving unit, and a calculation unit. The pre-distortion unit generates a plurality of test signals in the calibration mode, wherein the power of the current test signal is different from the power of the previous test signal by a preset value. The gain unit receives a current test signal and a previous test signal, and provides a substantially fixed gain value to amplify the current test signal and the previous test signal. The power amplifying unit amplifies the current test signal after gain and the previous test signal after gain to generate a first transmission signal and a second transmission signal. The receiving unit receives the first transmission signal and the second transmission signal. A calculation unit, calculating a power difference between the first transmission signal and the second transmission signal, and comparing the difference with the preset value to determine whether the substantially fixed gain value provided by the gain unit allows multiple test signals to operate in power amplification Compression and linear regions of the unit.

Description

technical field [0001] The present invention relates to a power amplifier of a high-speed radio frequency communication system, in particular to an automatic gain adjustment device and method of the power amplifier. Background technique [0002] About the signal processing of the compression region (compression region) of the power amplifier (Power Amplifier, PA) in the high-speed radio communication system (high-speed radio communication system), wherein, the digital predistortion technique (digital predistortion approach) can compensate the linearity of the power amplifier status and cost savings, especially in the implementation of digital signal processors (digital signal processors, DSPs). The principle of pre-distortion theory pre-compensates the amount of distortion of the transmission signal in the amplification process of the power amplifier. [0003] figure 1 A schematic diagram of a predistortion unit 11 and a power amplifier 12 is shown. The diagram A on the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/20
Inventor 张元硕
Owner REALTEK SEMICON CORP
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