Method for solving DC-offset of zero intermediate frequency receiver and circuit thereof

A zero-IF receiver, DC drift technology, applied in demodulation, electrical components, modulation transfer, etc., can solve problems affecting baseband signal processing, functional unit saturation, etc., to suppress DC drift, improve performance, and reduce area.

Inactive Publication Date: 2007-07-04
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the use of zero intermediate frequency, the DC drift of the receiver is the main shortcoming of the direct down-conversion receiver. If the DC drift is too large, the next-level functional unit will be saturated, which will seriously affect the processing of the next-level baseband signal.

Method used

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  • Method for solving DC-offset of zero intermediate frequency receiver and circuit thereof
  • Method for solving DC-offset of zero intermediate frequency receiver and circuit thereof
  • Method for solving DC-offset of zero intermediate frequency receiver and circuit thereof

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Embodiment Construction

[0029] As shown in Figure 1: Zero-IF receiver with DC drift suppression circuit includes: low noise amplifier, mixer, DC drift suppression circuit and baseband processor. The DC drift suppression circuit includes a differential mode feedback network, a common mode feedback network and an active load. The RF signal of the low noise amplifier is input to the mixer, and the output signal IF signal of the mixer is output to the differential mode feedback network, the common mode feedback network, and the baseband processor.

[0030] The design steps of the zero-IF receiver DC drift suppression circuit are as follows:

[0031] Step 1: Design a Gilbert double-balanced mixer unit and add an active load at the output load.

[0032] 1. Determine the mixer unit;

[0033] 2. Determine the indicators of the mixer design;

[0034] 3. Determine the active load, which is determined by the amplitude of the mixer output and the requirements for the conversion gain of the mixer; the active l...

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Abstract

This invention relates to wireless LAN RF front-end technology, and it provides a method and its circuit to solve zero-IF receiver DC drift. The receiver mixer uses analog feedback principle to achieve the DC drift inhibition. It includes: a zero-IF direct down conversion mixer, a differential analog feedback network with capacitance doubling, and an analog common model feedback network. The DC drift inhibition circuit has following design steps: Step 1: designing Gilbert double-balanced mixer module, and adding powered load to the output load end; Step 2: designing differential analog feedback network; Step 3: designing common model feedback network design.

Description

technical field [0001] The invention relates to the technical field of radio-frequency front-end (Radio-Frequency Front-End) of a wireless local area network, and proposes a method and a circuit for solving the DC drift of a zero-IF receiver. Background technique [0002] In recent years, the rapid development of wireless communication technologies such as Wireless Local Area Network (WLAN), 3G technology, and Bluetooth (Bluetooth) has promoted further research on integrated wireless receivers in the GHz frequency range. The radio frequency transceiver (Transceiver) front-end architecture based on these wireless communication standards is mainly divided into a superheterodyne type and a direct down-conversion type. [0003] The traditional superheterodyne structure has a long history of converting the signal frequency band (RF) to a relatively low intermediate frequency (IF). The intermediate frequency IF is filtered, amplified, converted to baseband, and finally quantized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B1/30H03D7/00
Inventor 许奇明石寅高鹏颜峻陈弘达
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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