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Direct Conversion Receiver with DC Offset Compensation Function and Its Compensation Method

A DC offset and receiver technology, applied in DC-coupled DC amplifiers, amplifiers with semiconductor devices/discharge tubes, and oscillation conversion angle demodulation, etc., can solve problems such as long charging time

Inactive Publication Date: 2011-11-30
VIA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, due to the long charging time of the capacitor in the track and hold circuit, the above-mentioned receiver needs a long time to complete the compensation of the DC offset

Method used

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  • Direct Conversion Receiver with DC Offset Compensation Function and Its Compensation Method
  • Direct Conversion Receiver with DC Offset Compensation Function and Its Compensation Method
  • Direct Conversion Receiver with DC Offset Compensation Function and Its Compensation Method

Examples

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Embodiment Construction

[0052] figure 2 The receiving path of a mobile phone is shown. The receiving path includes an antenna 61, a radio frequency receiver 4, a signal processing module 7 and a speaker 9. The receiver 4 is connected between the antenna 61 and the signal processing module 7, and the signal processing module 7 is connected to the speaker 9. The mobile phone also includes a transmission path formed by a transmitter 8 connected to an antenna 61. The receiver 4 usually includes an array of amplifiers, which are separated by a frequency conversion circuit (such as a mixer) to capture the information contained in the weak signal voltage appearing at the antenna output. The receiver 4 outputs a baseband signal to the signal processing module 7 for further signal processing.

[0053] image 3 The direct conversion receiver in an embodiment of the invention is shown. It includes a mixer module 42 and an amplifier module 47. The mixer module 42 has an input 43 and an output 45 to connect the...

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PUM

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Abstract

The present invention provides a direct conversion receiver with a DC offset compensation function, including an antenna, a mixer module, an automatic gain control amplifier, an adder, a DC offset elimination circuit, a track and hold circuit and a switch circuit. The antenna receives a radio frequency signal with a carrier frequency. The mixer module converts the RF signal to a baseband signal. An automatic gain control amplifier amplifies the fundamental frequency signal. The adder subtracts the DC offset current from the fundamental frequency signal. The DC offset elimination circuit obtains the DC offset value in the digital signal and converts it into a DC offset current. The track and hold circuit receives the fundamental frequency signal, maintains the DC offset voltage on the capacitor, and converts it into a DC offset current. The switching circuit alternately switches the DC offset elimination circuit and the tracking and holding circuit to receive the fundamental frequency signal.

Description

Technical field [0001] The invention relates to a direct conversion receiver, in particular to a direct conversion receiver with a DC offset compensation function used in a mobile phone. Background technique [0002] In a digital communication system, the transmitted signal is generated by mixing digital data with a carrier after being modulated. Digital signals are usually transmitted in bursts, and each burst contains multiple data bits. When the transmitted signal is received, it must go through a step of demodulation to get the data back. [0003] The basic architecture of a wireless receiver usually uses a direct conversion receiver to demodulate the received signal. It uses a local oscillator with the same carrier frequency to down-convert the received signal to generate in-phase and quadrature fundamental frequency signals. The direct conversion receiver has the advantages of low cost and low energy consumption. The main purpose of direct frequency reduction is to direct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/12H03D3/00H03F3/45H03G3/30H04B1/30
CPCH03F2200/372H03F2200/294H03F3/45977H04B1/30H03D3/008H03G3/3052
Inventor 陈培炜
Owner VIA TECH INC
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