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DC offset elimination method, system, terminal and circuit

A DC offset and elimination circuit technology, applied in the direction of electrical components, impedance networks, digital technology networks, etc., can solve the problems of large DC offset and residual, and achieve the effect of ensuring speed and accuracy

Pending Publication Date: 2021-12-14
上海翰迈电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a disadvantage, that is, when the complex bandpass filter is connected, the DC offset still has a small step jump, resulting in a large residual DC offset

Method used

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  • DC offset elimination method, system, terminal and circuit
  • DC offset elimination method, system, terminal and circuit
  • DC offset elimination method, system, terminal and circuit

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Embodiment Construction

[0039] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of ​​the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual impleme...

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Abstract

The invention provides a DC offset elimination method, system, terminal and circuit. The DC offset elimination method comprises the following steps: obtaining a comparison result of differential output of an I path of a complex band-pass filter; obtaining a comparison result of the differential output of the Q path of the complex band-pass filter; and based on a comparison result of the I path and the Q path, outputting digital direct current offset elimination information so as to enable the complex band-pass filter to realize direct current offset elimination. According to the DC offset elimination method, system, terminal and circuit, the direct current offset of the output end of the complex band-pass filter can be effectively eliminated.

Description

technical field [0001] The present invention relates to the technical field of DC offset elimination, in particular to a DC offset elimination method, system, terminal and circuit. Background technique [0002] With the development of Internet of Things (IoT) technology, radio frequency circuits have become a research hotspot. In the prior art, medium and low rate short-distance wireless communications such as BT / BLE, Zigbee, etc., mostly adopt a low intermediate frequency architecture. High integration and low power consumption are the advantages of this architecture, but it also faces the problem of image rejection. [0003] In order to solve the above problems, a complex band pass filter (Complex Band Pass Filter, CBPF) is usually introduced. The CBPF usually also has the function of a variable gain amplifier (Variable Gain Amplifier VGA). When the gain is relatively large, such as above 20dB, the DC offset (DC-offset) becomes a major factor affecting the dynamic range...

Claims

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Application Information

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IPC IPC(8): H03H17/02
CPCH03H17/0248H03H2017/0072
Inventor 熊秀春林汉超叶蓓
Owner 上海翰迈电子科技有限公司