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db linear variable gain amplifier

A gain amplifier and variable technology, applied in amplifiers, high-frequency amplifiers, radio frequency amplifiers, etc., can solve problems such as limited linearity of bipolar devices

Active Publication Date: 2021-01-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Linearity requirements prevent the use of this method in many cases due to the very limited linearity of bipolar devices without negative feedback

Method used

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Embodiment Construction

[0040] first, figure 1 The general structure and function of the variable gain amplifier of the first aspect is shown. see Figure 2 to Figure 5 , describing the details of the structure and function. Some similar entities and reference numerals in different figures have been omitted.

[0041] In general, the proposed amplifier fully exploits the concept of dB linear current and current steering of dB linear current in current mode configuration to achieve accurate gain step size and high linearity. Limitations of the prior art are overcome.

[0042] a. Complexity: The circuit implements gain steps directly in the signal path without adding too much complexity to the signal path. The current used to set the gain step is outside the signal path. Due to the dB linearity, the gain step size can be both accurate and very small, eg, below 1dB, and cover a wide range.

[0043] b. Bandwidth limiting: The circuit operates in current mode in the signal path, with gain steps achie...

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Abstract

A variable gain amplifier (1) is used to amplify the input signal (I vga_in ) to generate a dB linear output signal (I vga_out ). The variable gain amplifier (1) comprises a dB linear control current generator (2), a control voltage generator (3) and an output current regulator (4). The dB linear control current generator (2) is used to generate a dB linear control current (I based on a predefined gain setting) lin_in_dB ). The control voltage generator (3) is used to control the current (I) linearly from the dB lin_in_dB ) to generate the control voltage (V vga_ctrl ). The output current regulator (4) is adapted to be based on the input signal (I vga_in ) and the control voltage (V vga_ctrl ) to generate the dB linear output signal (I vga_out ).

Description

technical field [0001] The present invention relates to variable gain amplifiers, and more particularly to variable gain amplifiers capable of very precise control. Background technique [0002] Practice has proved that it is difficult to achieve fine and accurate gain steps in variable gain amplifiers over a large gain range and wide signal bandwidth, for example, a bandwidth greater than 500 MHz, while ensuring high linearity. This is especially because of limited bandwidth in existing implementations. In the 5G communication system, the signal bandwidth will be higher than that of the existing 2G / 3G / 4G communication system. Therefore, it becomes very important to achieve good performance over a wide bandwidth. [0003] These issues are explained below. [0004] 1. A closed-loop or open-loop approach can be used where an array of resistors is used and the resistance values ​​are switched to set the desired gain. In a closed-loop approach, this can be achieved by switch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G1/00H03F3/19H03F3/45H03F1/08
CPCH03F1/083H03F3/19H03F3/45085H03F3/45475H03F2200/18H03F2200/21H03F2200/42H03F2200/451H03F2200/555H03F2203/45454H03F2203/45472H03F2203/45476H03F2203/45528H03F2203/45544H03F2203/45596H03F2203/45656H03F2203/45701H03F2203/45702H03G1/0023H03G1/0082H03G7/06
Inventor 海伦·韦特
Owner HUAWEI TECH CO LTD
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