CN106330131A - Zero frequency high-suppression complex filter device - Google Patents
Zero frequency high-suppression complex filter device Download PDFInfo
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- CN106330131A CN106330131A CN201510373550.2A CN201510373550A CN106330131A CN 106330131 A CN106330131 A CN 106330131A CN 201510373550 A CN201510373550 A CN 201510373550A CN 106330131 A CN106330131 A CN 106330131A
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- complex filter
- circuit
- suppression
- zero
- filter circuit
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Abstract
The invention discloses a zero frequency high-suppression complex filter device, comprising a complex filter circuit and a highpass feedback circuit. The complex filter circuit comprises an I-way signal channel and a Q-way signal channel. The I-way signal channel and the Q-way signal channel carry out cross feedback and feed back the output of the complex filter circuit to an input end of a first amplifier of a complex filter. The highpass circuit is taken as a feedback loop, thereby filtering image frequency of input signals and suppressing low frequency and zero frequency of the input signals. Through application of the device, for increase of suppression of the zero frequency and low frequency signals of the complex filter, on the premise that an area is changed slightly, the high pass feedback circuit is increased, and the system reliability and performance are improved.
Description
Technical field
The present invention relates to integrated chip technology field, the complex filter device of a kind of zero-frequency height suppression.
Background technology
At present, it is required to filtering in communication system to filter out of band signal, for using the system of Low Medium Frequency
Framework, determines a need for complex filter (Complex Filter) according to system requirements and filters mirror image
Signal, complex filter has bigger suppression to image signal, but the suppression to DC level is the poorest
A bit, if it is considered that the DC level imbalance of complex filter front end, such as, the DC level imbalance of frequency mixer,
With the DC maladjustment of amplifier in wave filter three SIGMA estimation, the gain of filtering itself is easy to filtering
Output support was lost efficacy to wave filter, causes signal path to lose efficacy, ultimately results in chip failure, particularly at height
In the complex filter of gain all the more so, so the suppression to the DC level of complex filter must enter one
Step increases.
Generally utilizing DC offset calibration or be designed to bandpass filtering to carry out DC level suppression, direct current is inclined
Put calibration and design complexities can be significantly increased, particularly in high-gain and high-grade filting；And it is designed to band
Pass filter has again two kinds of methods: add isolation capacitance and high-pass feedback, isolation capacitance size and high-pass feedback zero
Point, complex filter low pass bandwidth and the equivalent load of next stage are held relevant, particularly bigger in bandwidth ratio
During application limited, and high-pass feedback zero point is owing to being suppression DC level and low-frequency noise, it is possible to zero
It is relatively low that point is designed to ratio, changes insensitive to path, and electric capacity is chosen little, and resistance is chosen greatly, operational amplifier design
Difficulty is also little, and the domain of such high-pass feedback circuit also will not be very big, typically can be less than isolation capacitance,
So area of chip is the least, and cost increases little.
But, current common structure is that real number filtering adds high-pass feedback, and due to complex filter principle and
Structure is complicated, does not the most find the scheme combined with high-pass feedback.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides the complex filter circuit of a kind of zero-frequency height suppression,
Can suppress for the DC level increasing complex filter, promote reliability and the performance of system.
In order to reach the object of the invention, the invention provides the complex filter circuit of a kind of zero-frequency height suppression,
Including: complex filter circuit and high-pass feedback circuit；Described complex filter circuit includes I road signalling channel
With Q road signalling channel, described I road signalling channel and Q road signalling channel cross feedback, by described plural number
The output of filter circuit feeds back to the input of first amplifier of described complex filter circuit；By described
Low pass circuit is as feedback circuit, with the image frequency of filtered input signal and suppress the zero-frequency of input signal and low
Frequently.
Further, the complex filter circuit of described zero-frequency height suppression is that first-order difference complex filter adds high pass
Feedback circuit, including first-order difference complex filter circuit and two high-pass feedback circuit.
Further, the complex filter circuit of described zero-frequency height suppression is that second differnce complex filter adds high pass
Feedback circuit, including second differnce complex filter circuit and two high-pass feedback circuit.
Further, the complex filter circuit of described zero-frequency height suppression is that third order difference complex filter adds high pass
Feedback circuit, adds high pass feedback circuit and a second differnce plural number including a first-order difference complex filter
Filtering adds high pass feedback circuit.
Further, the complex filter circuit of described zero-frequency height suppression is that N jump divides complex filter to add high pass
Feedback circuit, adds high pass feedback circuit and b second differnce plural number including a first-order difference complex filter
Filtering adds high pass feedback circuit, and wherein N=1a+2b, N, a and b are integer.
Further, described N jump divides complex filter to add in high pass feedback circuit, at complex filter circuit
Every grade increase high-pass feedback circuit.
Further, described N jump divides complex filter to add in high pass feedback circuit, at complex filter circuit
Pre-set level increase high-pass feedback circuit.
Present invention also offers the complex filter device of a kind of zero-frequency height suppression, including foregoing zero-frequency
The complex filter circuit of high suppression.
In the present invention, by increasing high-pass feedback on the basis of complex filter, utilize feedback principle, make whole
Individual circuit serves the effect of complex filter and low-pass filtering.
Other features and advantages of the present invention will illustrate in the following description, and, partly from froming the perspective of
Bright book becomes apparent, or understands by implementing the present invention.The purpose of the present invention is excellent with other
Point can be realized by structure specifically noted in description, claims and accompanying drawing and be obtained.
Accompanying drawing explanation
Accompanying drawing is used for providing being further appreciated by technical solution of the present invention, and constitutes one of description
Point, it is used for explaining technical scheme together with embodiments herein, is not intended that the present invention
The restriction of technical scheme.
Fig. 1 is a kind of single-ended high-pass feedback circuit and simulation result schematic diagram thereof.
Fig. 2 is another kind of single-ended high-pass feedback circuit and simulation result schematic diagram thereof.
Fig. 3 is a kind of first-order difference complex filter circuit and simulation result schematic diagram thereof.
Fig. 4 is a kind of second differnce complex filter circuit and simulation result schematic diagram thereof.
Fig. 5 is that the first-order difference complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.
Fig. 6 is that the second differnce complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.
Fig. 7 is that the third order difference complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing
Embodiments of the invention are described in detail.It should be noted that in the case of not conflicting, this Shen
Embodiment in please and the feature in embodiment can mutual combination in any.
Can be at the computer of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing
System performs.And, although show logical order in flow charts, but in some cases,
Can be to be different from the step shown or described by order execution herein.
The present invention, based on complex filter principle and high-pass feedback principle, introduces lower high-pass feedback the most respectively
And complex filter.
Fig. 1 is a kind of single-ended high-pass feedback circuit and simulation result schematic diagram thereof.Fig. 2 is another kind of single-ended
High-pass feedback circuit and simulation result schematic diagram thereof.Referring to the circuit diagram of Fig. 1 and Fig. 2, in single-ended high pass
Transmission function in feedback circuit is:
Referring to the simulation result shown in Fig. 1 and Fig. 2, abscissa is freq (Hz), and vertical coordinate is YO (dB),
The transverse and longitudinal coordinate illustrated below is also such, follow-up repeats no more.Use resistance capacitance different with amplifier
Connecting, make low frequency signal suppression many, high-frequency signal suppression is few.
Fig. 3 is a kind of first-order difference complex filter circuit and simulation result schematic diagram thereof.Fig. 4 is a kind of two
Jump divides complex filter circuit and simulation result schematic diagram thereof.Referring to the circuit diagram of Fig. 3 and Fig. 4, IQ hands over
Fork feedback, output feeds back to the input of amplifier.Referring to the simulation result shown in Fig. 3 and Fig. 4, multiple
Number filtering suppression image frequency, the signal of positive frequency has gain, and the signal of negative frequency is suppressed.
Relative to prior art, in the present invention complex filter and high-pass feedback are integrated, in conjunction with both strong points,
It does not interfere with each other again.
Fig. 5 is that the first-order difference complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.Circuit diagram as shown in Figure 5, by circuit integrated to first-order difference complex filter and high-pass feedback,
Adding resistance feedback between I road signalling channel and Q road signalling channel, the input of amplifier is received in output；
Using high pass circuit as feedback circuit, play suppression low frequency and the effect of zero-frequency；High pass circuit is that I road is anti-
Feedback I road, feedback Q road, Q road, complex filter is by I road signalling channel and Q road signalling channel cross feedback.
Simulation result as shown in Figure 5, exports on frequency domain, and the image frequency of signal is filtered.
Fig. 6 is that the second differnce complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.Circuit diagram as shown in Figure 6, second differnce complex filter adds the circuit of high pass feedback circuit
Method of attachment is the input that output feeds back to first amplifier of second-order circuit.Emulation as shown in Figure 6
As a result, the image frequency of signal is filtered, and the signal near zero-frequency has obtained the biggest suppression.
Fig. 7 is that the third order difference complex filter in the embodiment of the present invention adds high pass feedback circuit and emulation knot thereof
Really schematic diagram.Circuit diagram as shown in Figure 7, it is by one that third order difference complex filter adds high pass feedback circuit
Individual first-order filtering adds high pass feedback circuit and a second-order filter adds high pass feedback circuit superposition, the inside circuit
Connect and do not become.
The complex filter of higher order adds high pass feedback circuit, and to have only to continue superposition single order and second differnce multiple
Wavenumber filter adds high pass feedback circuit, and such as N jump divides complex filter to add high pass feedback circuit, including a
Individual first-order difference complex filter adds high pass feedback circuit and b second differnce complex filter adds high-pass feedback electricity
Road, wherein N=1a+2b, N, a and b are integer.
In addition it is also possible to selectively do high-pass feedback on every grade or part level, it is not repeated herein.
The imitative of high pass feedback circuit is added by the single order of the example above, second order and third order difference complex filter
True as a result, it is possible to find out that low frequency signal has obtained the biggest suppression, and the change of other frequency domain is little, such as
Single order complex filter, the suppression to direct current increases about 40dB；Second-order complex filter, presses down direct current
System increases about 30dB；Three rank complex filters, the suppression to direct current increases about 67dB.If high-order
Complex filter, the same onset of high-pass feedback, low frequency signal suppresses more.
In the present invention, by increasing high-pass feedback on the basis of complex filter, utilize feedback principle, make
Whole circuit serves the effect of complex filter and low-pass filtering.
Although the embodiment that disclosed herein is as above, but described content only readily appreciates the present invention
And the embodiment used, it is not limited to the present invention.Technology people in any art of the present invention
Member, on the premise of without departing from the spirit and scope that disclosed herein, can be in the form implemented and thin
Any amendment and change is carried out on joint, but the scope of patent protection of the present invention, still must be with appended right
Claim is defined in the range of standard.
Claims (8)
1. the complex filter circuit of a zero-frequency height suppression, it is characterised in that including: complex filter circuit
With high-pass feedback circuit；
Described complex filter circuit includes I road signalling channel and Q road signalling channel, and described I road signal leads to
Road and Q road signalling channel cross feedback, feed back to described plural number filter by the output of described complex filter circuit
The input of first amplifier of wave circuit；
Using described high pass circuit as feedback circuit, with zero-frequency and the low frequency signal of filtered input signal.
The complex filter circuit of zero-frequency height the most according to claim 1 suppression, it is characterised in that institute
The complex filter circuit stating the suppression of zero-frequency height is that first-order difference complex filter adds high pass feedback circuit, including one
Jump divides complex filter circuit and high-pass feedback circuit.
The complex filter circuit of zero-frequency height the most according to claim 2 suppression, it is characterised in that institute
The complex filter circuit stating the suppression of zero-frequency height is that second differnce complex filter adds high pass feedback circuit, including two
Jump divides complex filter circuit and high-pass feedback circuit.
The complex filter circuit of zero-frequency height the most according to claim 3 suppression, it is characterised in that institute
The complex filter circuit stating the suppression of zero-frequency height is that third order difference complex filter adds high pass feedback circuit, including one
Individual first-order difference complex filter adds high pass feedback circuit and a second differnce complex filter adds high-pass feedback electricity
Road.
The complex filter circuit of zero-frequency height the most according to claim 3 suppression, it is characterised in that institute
The complex filter circuit stating the suppression of zero-frequency height is that N jump divides complex filter to add high pass feedback circuit, including a
Individual first-order difference complex filter adds high pass feedback circuit and b second differnce complex filter adds high-pass feedback electricity
Road, wherein N=1a+2b, N, a and b are integer.
The complex filter circuit of zero-frequency height the most according to claim 5 suppression, it is characterised in that institute
Stating N jump divides complex filter to add in high pass feedback circuit, anti-in every grade of increase high pass of complex filter circuit
Current feed circuit.
The complex filter circuit of zero-frequency height the most according to claim 5 suppression, it is characterised in that institute
Stating N jump divides complex filter to add in high pass feedback circuit, and the part level at complex filter circuit increases high pass
Feedback circuit.
8. the complex filter device of a zero-frequency height suppression, it is characterised in that include such as claim 1～7
The complex filter circuit of described zero-frequency height suppression.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373550.2A CN106330131B (en) | 2015-06-30 | 2015-06-30 | A kind of complex filter device that zero-frequency height inhibits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510373550.2A CN106330131B (en) | 2015-06-30 | 2015-06-30 | A kind of complex filter device that zero-frequency height inhibits |
Publications (2)
| Publication Number | Publication Date |
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| CN106330131A true CN106330131A (en) | 2017-01-11 |
| CN106330131B CN106330131B (en) | 2019-06-07 |
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| CN201510373550.2A Active CN106330131B (en) | 2015-06-30 | 2015-06-30 | A kind of complex filter device that zero-frequency height inhibits |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257028A (en) * | 2018-09-27 | 2019-01-22 | 东南大学 | A kind of low-power consumption plural number double-two-order unit circuit of current multiplexing |
| CN110708037A (en) * | 2019-11-11 | 2020-01-17 | 苏州华芯微电子股份有限公司 | Trans-impedance image filter with adjustable bandwidth, gain and frequency |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040053590A1 (en) * | 2002-09-13 | 2004-03-18 | Broadcom Corporation | Transconductance / C complex band-pass filter |
| CN102055695A (en) * | 2009-10-30 | 2011-05-11 | 芯光飞株式会社 | DC offset suppression circuit for a complex filter |
| CN102638240A (en) * | 2012-04-24 | 2012-08-15 | 无锡中科微电子工业技术研究院有限责任公司 | Double-mode type active power filter circuit with adjustable bandwidth |
| JP2014060620A (en) * | 2012-09-18 | 2014-04-03 | Fujitsu Semiconductor Ltd | Complex bandpass filter |
-
2015
- 2015-06-30 CN CN201510373550.2A patent/CN106330131B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040053590A1 (en) * | 2002-09-13 | 2004-03-18 | Broadcom Corporation | Transconductance / C complex band-pass filter |
| CN102055695A (en) * | 2009-10-30 | 2011-05-11 | 芯光飞株式会社 | DC offset suppression circuit for a complex filter |
| CN102638240A (en) * | 2012-04-24 | 2012-08-15 | 无锡中科微电子工业技术研究院有限责任公司 | Double-mode type active power filter circuit with adjustable bandwidth |
| JP2014060620A (en) * | 2012-09-18 | 2014-04-03 | Fujitsu Semiconductor Ltd | Complex bandpass filter |
Non-Patent Citations (2)
| Title |
|---|
| AHMED A. EMIRA 等: "A Pseudo Differential Complex Filter for Bluetooth With Frequency Tuning", 《IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS—II》 * |
| 钟伦贵 等: "基于伪差分结构跨导器的Gm-C复数滤波器涉及", 《中国科学院研究生院学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257028A (en) * | 2018-09-27 | 2019-01-22 | 东南大学 | A kind of low-power consumption plural number double-two-order unit circuit of current multiplexing |
| CN109257028B (en) * | 2018-09-27 | 2022-04-15 | 东南大学 | Current multiplexing low-power consumption complex biquad unit circuit |
| CN110708037A (en) * | 2019-11-11 | 2020-01-17 | 苏州华芯微电子股份有限公司 | Trans-impedance image filter with adjustable bandwidth, gain and frequency |
| WO2021093520A1 (en) * | 2019-11-11 | 2021-05-20 | 苏州华芯微电子股份有限公司 | Transimpedance mirror filter with adjustable bandwidth, gain and frequency |
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|---|---|
| CN106330131B (en) | 2019-06-07 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20190418 Address after: 266100 No. 1, Keyuan Wei Road, Laoshan District, Qingdao City, Shandong Province Applicant after: Datang Semiconductor Technology Co., Ltd. Address before: 100094 No. 6 Yongjia North Road, Beijing, Haidian District Applicant before: Datang Semiconductor Design Co., Ltd. |
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| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20170111 Assignee: Meitang Zhilian Health Technology (Jiangsu) Co., Ltd Assignor: Datang Semiconductor Technology Co.,Ltd. Contract record no.: X2020990000422 Denomination of invention: A complex filter with zero frequency and high rejection Granted publication date: 20190607 License type: Common License Record date: 20200818 |
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| EE01 | Entry into force of recordation of patent licensing contract |