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Digital-analog hybrid demodulator and demodulation method

A digital-analog hybrid and demodulator technology, used in digital transmission systems, modulation carrier systems, electrical components, etc., can solve the problems of high power consumption and high bit error rate, and achieve the effect of superior demodulation performance

Inactive Publication Date: 2012-07-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of high power consumption and high bit error rate of the traditional wireless demodulation system in the prior art, the embodiment of the present invention provides a digital-analog hybrid demodulator and demodulation method

Method used

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Embodiment 1

[0021] The digital-analog hybrid demodulator provided by the embodiment of the present invention may specifically be a low-intermediate frequency Gauss frequency shift keying (Gauss frequency Shift Keying, GFSK) GFSK digital-analog hybrid demodulator, including a first PLL100, a second PLL200, An analog filter 300, an analog-to-digital converter 400 (the analog-to-digital converter can be a delta-sigma ADC), and a digital filter 500 are formed, see figure 1 .

[0022] The output of the first single phase-locked loop and the signal to be demodulated are used as the input of the second single phase-locked loop; the output of the second single phase-locked loop is used as the input of the analog filter; the analog The output of the filter is used as the input of the analog-to-digital converter, and the output of the analog-to-digital converter is used as the input of the digital filter; the output of the digital filter is the demodulated signal.

[0023] Among them, in the above...

Embodiment 2

[0040] The embodiment of the present invention provides a signal demodulation method, which is applied to the attached figure 1 In the architecture provided, the method includes:

[0041] The second single phase-locked loop receives the analog signal to be demodulated, and the frequency difference and phase difference of the output frequency of the first single phase-locked loop;

[0042] The second single phase-locked loop uses the frequency difference and phase difference between the received analog signal and the output frequency of the first single phase-locked loop to generate the control voltage of the voltage-controlled oscillator. Demodulating the signal to be demodulated under voltage control;

[0043] The second single phase-locked loop sends the demodulated signal to an analog filter for filtering for the first time;

[0044] The analog filter sends the first-filtered analog signal to an analog-to-digital converter;

[0045] The analog-to-digital converter conver...

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Abstract

The embodiment of the invention provides a digital-analog hybrid demodulator and a demodulation method. The digital-analog hybrid demodulator comprises a first single phase locked loop (PLL), a second single PLL, an analog filter, an analog-to-digital converter (ADC) and a digital filter, wherein the output of the first single PLL and signals required to be demodulated are used as the input of the second single PLL; the output of the second single PLL is used as the input of the analog filter; the output of the analog filter is used as the input of the ADC, and the output of the ADC is used as the input of the digital filter; and the output of the digital filter is demodulated signals. The digital-analog hybrid demodulator can effectively overcome the defects of the conventional demodulation system by adopting a double-PLL high-speed high-performance digital-analog hybrid demodulation system, and has the characteristics of high speed and high performance.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a digital-analog hybrid demodulator and a demodulation method. Background technique [0002] A traditional wireless demodulation system includes a single phase-locked loop (Phase Locked Loop, PLL) and a digital filter. Among them, the PLL is composed of a phase detector PFD, a charge pump (Charge Pump), a loop filter LPF, a voltage-controlled oscillator VCO and a frequency divider. In a traditional wireless demodulation system, the PFD performs frequency discrimination and phase discrimination on the transmission signal and the reference signal, and charges and discharges the capacitor through a charge pump to generate a voltage-controlled oscillator (VCO) control voltage. In this loop The VCO control voltage collected in is the demodulated input signal. The digital filter uses a high-speed clock to sample and filter the input signal, and demodulates and filters it to the des...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/148H04L27/152
Inventor 王琴郭筝时锴李宝骐
Owner SHANGHAI JIAO TONG UNIV
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