CN103647513A - Digital down converter - Google Patents
Digital down converter Download PDFInfo
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- CN103647513A CN103647513A CN201310720001.9A CN201310720001A CN103647513A CN 103647513 A CN103647513 A CN 103647513A CN 201310720001 A CN201310720001 A CN 201310720001A CN 103647513 A CN103647513 A CN 103647513A
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- module
- down converter
- digital down
- cic
- extractor
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Abstract
The invention provides a digital down converter comprising a frequency mixer, a CIC (cascaded integrator comb) extractor and an FIR (finite impulse response) filter which are sequentially connected. The CIC extractor comprises an input module, an integrator module, an extractor module, a differentiator module and an output module which are sequentially connected, and the FIR filter comprises an input module, a multiplier module, an accumulator module, an extractor module and an output module. The digital down converter is simple in structure and high in reliability and practicability.
Description
Technical field
The invention belongs to communication technical field, particularly a kind of digital down converter.
Background technology
The most complex structure of current digital down converter, circuit connects loaded down with trivial details, thereby reliability is low, in particular for the digital down converter of radar system, needs higher reliability; And problem that cannot computing easily appears that port bit wide surpasses 18bit and in the multiplier in existing digital down converter.
Summary of the invention
The problem existing for background technology, the invention provides a kind of digital down converter.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
A digital down converter, comprises connected successively frequency mixer, CIC withdrawal device, FIR filter; CIC withdrawal device comprises connected successively input module, integrator module, decimator module, difference engine module, output module; FIR filter comprises input module, multiplication module, accumulator module, decimator module, output module.
Described multiplication module comprises 18bit * 18bit multiplier of two cascades.
Compared with prior art, the feature that the present invention has is simple in structure, reliability is high, and it utilizes the cascade of two 18bit * 18bit multipliers to construct the multiplier of 31bit * 16bit, solved when a port bit wide surpasses 18bit cannot computing problem, practical.
Accompanying drawing explanation
Fig. 1 is structure diagram of the present invention.
Fig. 2 is the schematic diagram of frequency mixer in the present invention.
Fig. 3 is the structure diagram of CIC withdrawal device in the present invention.
Fig. 4 is the structure diagram of FIR filter in the present invention.
Fig. 5 is the schematic diagram of multiplier in FIR filter of the present invention.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
As shown in drawings, the present invention includes connected successively frequency mixer, CIC withdrawal device, FIR filter; CIC withdrawal device comprises connected successively input module, integrator module, decimator module, difference engine module, output module; FIR filter comprises input module, multiplication module, accumulator module, decimator module, output module; Multiplication module comprises 18bit * 18bit multiplier of two cascades.
During use, input signal of the present invention and technical indicator are: intermediate-freuqncy signal is that centre frequency is the narrow band signal of 21.4MHz, and bandpass sampling rate is 160kHz, and the every frame input of every passage is counted as 70k (70 * 1024); Total extracting multiple is 224, and it is 256 that the every frame output of every passage is counted; Cut-off frequency of the present invention is 180Hz, and bandpass flatness is less than 1.2dB, and stopband attenuation is greater than 60dB; The centre frequency of frequency mixer cosine and sine signal, sample rate are all identical with intermediate-freuqncy signal; The extracting multiple of CIC withdrawal device is 112, and progression is 3, and the time delay factor is 1; The extracting multiple of FIR filter is 2, and exponent number is 127.
Claims (2)
1. a digital down converter, is characterized in that: comprise connected successively frequency mixer, CIC withdrawal device, FIR filter; CIC withdrawal device comprises connected successively input module, integrator module, decimator module, difference engine module, output module; FIR filter comprises input module, multiplication module, accumulator module, decimator module, output module.
2. digital down converter according to claim 1, is characterized in that: described multiplication module comprises 18bit * 18bit multiplier of two cascades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310720001.9A CN103647513A (en) | 2013-12-24 | 2013-12-24 | Digital down converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310720001.9A CN103647513A (en) | 2013-12-24 | 2013-12-24 | Digital down converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103647513A true CN103647513A (en) | 2014-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201310720001.9A Pending CN103647513A (en) | 2013-12-24 | 2013-12-24 | Digital down converter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375937A (en) * | 2015-11-11 | 2016-03-02 | 中国电子科技集团公司第四十一研究所 | Digital intermediate frequency variable bandwidth shaping filtering device and method |
| CN107800441A (en) * | 2017-10-26 | 2018-03-13 | 慧众行知科技（北京）有限公司 | A kind of signal processing method and system |
| WO2019169316A1 (en) * | 2018-03-01 | 2019-09-06 | Texas Instruments Incorporated | Differentiator circuit |
| CN116688272A (en) * | 2023-08-07 | 2023-09-05 | 遂宁市中心医院 | Blood pressure and blood oxygen maintaining method for severe patients |
-
2013
- 2013-12-24 CN CN201310720001.9A patent/CN103647513A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375937A (en) * | 2015-11-11 | 2016-03-02 | 中国电子科技集团公司第四十一研究所 | Digital intermediate frequency variable bandwidth shaping filtering device and method |
| CN105375937B (en) * | 2015-11-11 | 2018-10-02 | 中国电子科技集团公司第四十一研究所 | A kind of digital intermediate frequency bandwidth varying forming filter and filtering method |
| CN107800441A (en) * | 2017-10-26 | 2018-03-13 | 慧众行知科技（北京）有限公司 | A kind of signal processing method and system |
| WO2019169316A1 (en) * | 2018-03-01 | 2019-09-06 | Texas Instruments Incorporated | Differentiator circuit |
| US10644677B2 (en) | 2018-03-01 | 2020-05-05 | Texas Instruments Incorporated | Differentiator circuit |
| CN116688272A (en) * | 2023-08-07 | 2023-09-05 | 遂宁市中心医院 | Blood pressure and blood oxygen maintaining method for severe patients |
| CN116688272B (en) * | 2023-08-07 | 2023-10-20 | 遂宁市中心医院 | Method for controlling ECMO system |
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Application publication date: 20140319 |