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Output feedback type sigma-delta modulator for maximizing output cycle length

A technology of output feedback and output cycle, which is applied in the direction of instruments, record carriers used by machines, calculations, etc., and can solve problems such as stability problems and complex implementations

Active Publication Date: 2017-05-10
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The delta-sigma modulator has two structures, single-loop and cascaded. The single-loop structure can get better noise performance, but there will be stability problems and complex implementation.

Method used

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  • Output feedback type sigma-delta modulator for maximizing output cycle length
  • Output feedback type sigma-delta modulator for maximizing output cycle length
  • Output feedback type sigma-delta modulator for maximizing output cycle length

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Experimental program
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Embodiment

[0021] refer to figure 1 , figure 2 , the three output feedback modules of the present invention are OFM1, OFM2, OFM3 respectively. The input I1 of the accumulator E in the OFM1 module is an external input X, the output Q1 of the accumulator E is connected to the input of the delay unit D3 and the I1 input of the accumulator E in the OFM2 module, and the output of the delay unit D3 is connected to the accumulator E The I2 input terminal of the accumulator E is connected to the input terminal of the delay unit D4, and the output of the module is connected to the input port C of the adder A1 of the noise cancellation network N, and the output of the delay unit D4 is connected to the amplifier a The input of the amplifier a is connected to the I3 input terminal of the accumulator E; the output Q2 of the accumulator E in the OFM2 module is connected to the input of the delay unit D3 and the I1 input terminal of the accumulator E in the OFM3 module, and the delay unit The output...

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Abstract

The invention discloses an output feedback type sigma-delta modulator for maximizing an output cycle length. The modulator adopts three output feedback modules (OFM) same in structure and a noise cancellation network N; for the modulator with the resolution of n bit, the OFMs of the modulator feed back an output to the output cycle length 2<3n> with a maximum input, so that the dispersion of a fractional-N frequency synthesizer can be effectively reduced; and the shaping of 60dB in each tenth harmonic generation is generated for noises by adopting a three-level cascade structure, so that in-band quantized noises are reduced.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design and signal processing, in particular to an output feedback incremental sum modulator which maximizes the output cycle length and is applied in a fractional frequency synthesizer of a wireless communication system. Background technique [0002] In recent years, due to the advantages of ultra-high frequency radio frequency identification technology (UHF RFID), such as long identification distance, small size, large storage capacity and non-contact, it has attracted widespread attention. It has been widely used in logistics and traffic management, etc., and this technology is closely related to life. [0003] The fractional frequency synthesizer is an important research direction in radio frequency identification technology. The phase noise and spurious performance of the fractional frequency synthesizer determine the communication quality of the system in the communication environm...

Claims

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Application Information

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IPC IPC(8): G06K19/07
CPCG06K19/0723
Inventor 张润曦石春琦任兵兵杨亚邓晓东田鹏飞
Owner EAST CHINA NORMAL UNIVERSITY