CN105932980A - Leap-frogging type multi-loop feedback switch current filter - Google Patents

Leap-frogging type multi-loop feedback switch current filter Download PDF

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CN105932980A
CN105932980A CN201610243839.7A CN201610243839A CN105932980A CN 105932980 A CN105932980 A CN 105932980A CN 201610243839 A CN201610243839 A CN 201610243839A CN 105932980 A CN105932980 A CN 105932980A
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semiconductor
oxide
metal
outfan
current
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CN105932980B (en
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赵文山
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0283—Filters characterised by the filter structure

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  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
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Abstract

The embodiment of the invention provides a leap-frogging type multi-loop feedback switch current filter which comprises a current mirror circuit, (n-1) first switch current bilinear integrators, and a second switch current bilinear integrator which are in a cascade connection orderly, and n is an integer larger than 1. The current mirror circuit is used for carrying out equivalent duplication and reversion on an external input signal and generating a positive output signal and a negative output signal. The second switch current bilinear integrator is used for carrying out integration on the current, and input ends comprise a positive input end and a negative input end. The positive input end is connected to the positive output end of a first switch current bilinear integrator with the number of (n-1), the negative input end is connected to the negative output end of the first switch current bilinear integrator with the number of (n-1), and output ends comprises a positive feedback output end, a negative feedback output end, and an external output end. The frequency response characteristic of the leap-frogging type multi-loop feedback switch current filter is good.

Description

Leap-frogging multiloop feedback switch current filter
Technical field
The present invention relates to field of analog integrated circuit, particularly relate to a kind of leap-frogging multiloop feedback switch electricity Stream wave filter.
Background technology
Analog filter can carry out frequency-selecting operation to input signal, automatically controlling, Aero-Space and instrument The fields such as instrument play an important role.
Early simulation wave filter is mainly LC wave filter, has the shortcomings such as big, the Heavy Weight of volume.Along with micro- Developing rapidly of electronic technology, various noninductive analog integrated filters realize technology and come out one after another, mainly collect In at analog filter continuous time.Although realize aspect and there is advantage in micro-volume, low-power consumption, continuously Time simulation filter response is determined by the absolute value of characteristic parameter, and the most integrated precision is poor, Need the time constant that complicated on-chip tuning circuit is preset with accurate realization.SCF technology Disadvantages mentioned above can be overcome, be widely used in industrial quarters.SCF belongs to hits According to analogue technique, its time constant depends on the ratio of electric capacity, can be the most integrated, and mid frequency can lead to Oversampling clock is tuned.But, switched capacitor technique needs floating capacity, with standard CMOS digital technology Incompatible, manufacturing cost is higher.In this context, switched current technique arises at the historic moment.Switching current is filtered The time constant of ripple device depends on the ratio of the channel width-over-length ratio of transistor, can be the most integrated, and need not line Property floating capacity, and standard VLSI cmos digital process compatible, is analog integrated filters design now The forward position research direction in field.
At present, Switched-Current Filter realize structure mainly include cascade, the trapezoidal simulation architecture of LC and with With leading level feedback arrangement.Wherein, switching current cascade structure has the shortcomings such as circuit sensitivity is high；LC Though trapezoidal simulation architecture can reduce circuit sensitivity, but it is complicated to realize structure, is unfavorable for correlation engineering personnel Carry out circuit design fast, accurately；Follow leading level feedback arrangement and have that feedback network is longer, frequency response The shortcomings such as characteristic is poor.
Summary of the invention
The embodiment provides a kind of leap-frogging multiloop feedback switch current filter, can contract The length of short filter feedback path, and have and realize the advantages such as simple in construction, circuit sensitivity be relatively low.
To achieve these goals, this invention takes following technical scheme.
A kind of leap-frogging multiloop feedback switch current filter, including:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for external input signal carries out equivalent duplication and reverse respectively, generates Forward output signal, negative sense output signal；Input is connected with external input signal, and described forward exports Signal is connected with the positive input of the described first switched-current bilinear integrator of serial number 1, described negative Negative input to output signal with the described first switched-current bilinear integrator of serial number 1 is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan, negative sense feedback output end and outside outfan； Wherein, serial number 1 is to the described forward outfan difference of the described first switched-current bilinear integrator of n-2 The positive input of output extremely next the first switched-current bilinear integrator of cascade, serial number 1 arrives n-2's The described negative sense outfan of described first switched-current bilinear integrator export respectively to cascade next the The negative input of one switched-current bilinear integrator；The described first switching current two-wire of serial number n-1 Property integrator described forward outfan output to second switch current bilinear integrator forward input End, the described negative sense outfan of the described first switched-current bilinear integrator of serial number n-1 exports to level The negative input of the second switch current bilinear integrator of connection；Serial number 2 is to described first switch of n-1 The described positive feedback outfan of current bilinear integrator exports the upper one first switch electricity to cascade respectively The negative input of stream bilinear integrators, the described first switched-current bilinear integration of serial number 2 to n-1 The described negative sense feedback output end of device exports the upper one first switched-current bilinear integrator to cascade respectively Positive input, the positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 Export the negative input of the described first switched-current bilinear integrator to serial number 1, serial number 1 The negative sense feedback output end of described first switched-current bilinear integrator exports to described the first of serial number 1 The positive input of switched-current bilinear integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators；
The outside outfan of n-1 described first switched-current bilinear integrator and described second switch electric current The outside outfan of bilinear integrators is the most connected, together as the output of described Switched-Current Filter.
A kind of leap-frogging multiloop feedback switch current filter, including:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for carrying out respectively external input signal replicating with reverse, generation n is just To output signal, n negative sense output signal；Input is connected with external input signal；Front n-1 is described just Positive input to output signal n-1 corresponding with sequence number respectively the first switched-current bilinear integrator It is connected, front n-1 described negative sense output signal n-1 corresponding with sequence number respectively the first switched-current bilinear The negative input of integrator is connected；Forward output signal described in n-th and described second switch electric current two-wire Property integrator positive input be connected, negative sense output signal described in n-th and described second switch electric current are double The negative input of line integral device is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan and negative sense feedback output end；Wherein, serial number 1 The described forward outfan of described first switched-current bilinear integrator to n-2 exports respectively to cascade The positive input of next the first switched-current bilinear integrator, described first switch of serial number 1 to n-2 The described negative sense outfan of current bilinear integrator exports to next first switching current of cascade double respectively The negative input of line integral device；The institute of the described first switched-current bilinear integrator of serial number n-1 State forward outfan and export the positive input to second switch current bilinear integrator, serial number n-1 The described negative sense outfan output of described first switched-current bilinear integrator is electric to the second switch of cascade The negative input of stream bilinear integrators；Serial number 2 is to the described first switched-current bilinear integration of n-1 The described positive feedback outfan of device exports the upper one first switched-current bilinear integrator to cascade respectively Negative input, the described negative sense of the described first switched-current bilinear integrator of serial number 2 to n-1 is anti- Feedback outfan exports the positive input of the upper one first switched-current bilinear integrator to cascade respectively, The positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 exports to serial number 1 The negative input of described first switched-current bilinear integrator, the described first switch electricity of serial number 1 The negative sense feedback output end of stream bilinear integrators exports described first switched-current bilinear to serial number 1 The positive input of integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators, outside outfan is the output of described Switched-Current Filter.
The technical scheme provided by embodiments of the invention described above is it can be seen that in the embodiment of the present invention, open Closing current filter to be made up of switched-current integrator cascade, circuit structure is simple, and is born by leap-frogging The introducing of feedback branch, can effectively shorten the length of Switched-Current Filter feedback network, and reduce switch The circuit sensitivity of current filter.
Aspect and advantage that the present invention adds will part be given in the following description, and these are by from following Description becomes obvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, institute in embodiment being described below The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some bright embodiments, for those of ordinary skill in the art, are not paying creative work Under premise, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 be Switched-Current Filter of the present invention realize circuit diagram；
Fig. 2-1 is the current mirroring circuit schematic diagram of Switched-Current Filter of the present invention；
Fig. 2-2 is the simplification circuit symbol signal of the current mirroring circuit of Switched-Current Filter of the present invention Figure；
Fig. 3-1 is the reality of the first switched-current bilinear integrator of Switched-Current Filter of the present invention Existing circuit diagram；
Fig. 3-2 is the letter of the first switched-current bilinear integrator of Switched-Current Filter of the present invention Change circuit symbol schematic diagram；
Fig. 4-1 is the reality of the second switch current bilinear integrator of Switched-Current Filter of the present invention Existing circuit diagram；
Fig. 4-2 is the letter of the second switch current bilinear integrator of Switched-Current Filter of the present invention Change circuit symbol schematic diagram；
Fig. 5 is the clock waveform schematic diagram of Switched-Current Filter of the present invention.
Fig. 6 be Switched-Current Filter of the present invention realize circuit diagram；
Fig. 7-1 is the current mirroring circuit schematic diagram of Switched-Current Filter of the present invention；
Fig. 7-2 is the simplification circuit symbol signal of the current mirroring circuit of Switched-Current Filter of the present invention Figure；
Fig. 8-1 is the reality of the first switched-current bilinear integrator of Switched-Current Filter of the present invention Existing circuit diagram；
Fig. 8-2 is the letter of the first switched-current bilinear integrator of Switched-Current Filter of the present invention Change circuit symbol schematic diagram；
Fig. 9-1 is the reality of the second switch current bilinear integrator of Switched-Current Filter of the present invention Existing circuit diagram；
Fig. 9-2 is the letter of the second switch current bilinear integrator of Switched-Current Filter of the present invention Change circuit symbol schematic diagram；
Figure 10 is the clock waveform schematic diagram of Switched-Current Filter of the present invention.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, The most same or similar label represents same or similar element or has same or like merit The element of energy.The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this Bright, and be not construed as limiting the claims.
Fig. 1 be Switched-Current Filter of the present invention realize circuit diagram；Fig. 2-1 is institute of the present invention The current mirroring circuit schematic diagram of the Switched-Current Filter stated；Fig. 2-2 is switching current of the present invention filter The simplification circuit symbol schematic diagram of the current mirroring circuit of ripple device；Fig. 3-1 is switching current of the present invention filter First switched-current bilinear integrator of ripple device realize circuit diagram；Fig. 3-2 is of the present invention The simplification circuit symbol schematic diagram of the first switched-current bilinear integrator of Switched-Current Filter；Fig. 4-1 It is that the circuit that realizes of the second switch current bilinear integrator of Switched-Current Filter of the present invention shows It is intended to；Fig. 4-2 is the second switch current bilinear integrator of Switched-Current Filter of the present invention Simplify circuit symbol schematic diagram；Fig. 5 is the clock waveform signal of Switched-Current Filter of the present invention Figure.It is described below in conjunction with Fig. 1-Fig. 5.
As it is shown in figure 1, be a kind of leap-frogging multiloop feedback switch current filter of the present invention, bag Include:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for external input signal carries out equivalent duplication and reverse respectively, generates Forward output signal, negative sense output signal；Input is connected with external input signal, and described forward exports Signal is connected with the positive input of the described first switched-current bilinear integrator of serial number 1, described negative Negative input to output signal with the described first switched-current bilinear integrator of serial number 1 is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan, negative sense feedback output end and outside outfan； Wherein, serial number 1 is to the described forward outfan difference of the described first switched-current bilinear integrator of n-2 The positive input of output extremely next the first switched-current bilinear integrator of cascade, serial number 1 arrives n-2's The described negative sense outfan of described first switched-current bilinear integrator export respectively to cascade next the The negative input of one switched-current bilinear integrator；The described first switching current two-wire of serial number n-1 Property integrator described forward outfan output to second switch current bilinear integrator forward input End, the described negative sense outfan of the described first switched-current bilinear integrator of serial number n-1 exports to level The negative input of the second switch current bilinear integrator of connection；Serial number 2 is to described first switch of n-1 The described positive feedback outfan of current bilinear integrator exports the upper one first switch electricity to cascade respectively The negative input of stream bilinear integrators, the described first switched-current bilinear integration of serial number 2 to n-1 The described negative sense feedback output end of device exports the upper one first switched-current bilinear integrator to cascade respectively Positive input, the positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 Export the negative input of the described first switched-current bilinear integrator to serial number 1, serial number 1 The negative sense feedback output end of described first switched-current bilinear integrator exports to described the first of serial number 1 The positive input of switched-current bilinear integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators；
The outside outfan of n-1 described first switched-current bilinear integrator and described second switch electric current The outside outfan of bilinear integrators is the most connected, together as the output of described Switched-Current Filter.
As shown in Fig. 2-1 and Fig. 2-2, described current mirroring circuit includes:
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th Metal-oxide-semiconductor M5, first input end Iin, the first negative sense outfan ia0 -With the first forward outfan ia0 +；
Second metal-oxide-semiconductor M2Grid connect the first metal-oxide-semiconductor M respectively1Grid and drain electrode, and connect first Input Iin；Second metal-oxide-semiconductor M2Drain electrode connect the first negative sense outfan ia0 -；Described second metal-oxide-semiconductor M2 Grid connect described 3rd metal-oxide-semiconductor M3Grid；
Described 3rd metal-oxide-semiconductor M3Drain electrode connect described 4th metal-oxide-semiconductor M4Grid and drain electrode；Described Four metal-oxide-semiconductor M4Grid connect described 5th metal-oxide-semiconductor M5Grid；
Described 5th metal-oxide-semiconductor M5Drain electrode connect described first forward outfan ia0 +；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th Metal-oxide-semiconductor M5Drain electrode all connect power supply；First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5Source grounding.
Second metal-oxide-semiconductor M2With the first metal-oxide-semiconductor M1The ratio of channel width-over-length ratio be a0；
First metal-oxide-semiconductor M1, the 3rd metal-oxide-semiconductor M3With the 4th metal-oxide-semiconductor M4Channel width-over-length ratio equal；
Second metal-oxide-semiconductor M2With the 5th metal-oxide-semiconductor M5Channel width-over-length ratio equal.
As shown in Fig. 3-1 and Fig. 3-2, described first switched-current bilinear integrator includes:
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14, the second positive input ik +, the second negative input ik -, the second forward outfan iak +、 Second negative sense outfan iak -, the first positive feedback outfan ifk +, the first negative sense feedback output end ifk -With first Outside outfan ick +；K is the sequence number of the first switched-current bilinear integrator, be greater than 0 less than or etc. Natural number in n-1；
Described 6th metal-oxide-semiconductor M6Drain electrode connect described 7th metal-oxide-semiconductor M7Drain electrode；Described 6th Metal-oxide-semiconductor M6Grid and drain electrode by second clock φ2The first switch controlled is connected；Described 6th metal-oxide-semiconductor M6Drain electrode and the second positive input ik +By second clock φ2The second switch controlled is connected；Described 6th Metal-oxide-semiconductor M6Drain electrode and the second negative input ik -By the first clock φ1The 3rd switch controlled is connected；φ1With φ2For two-phase non-overlapp-ing clock, clock waveform is as shown in Figure 5.
Described 7th metal-oxide-semiconductor M7Grid and drain electrode by the first clock φ1The 4th switch controlled is connected；Institute State the 7th metal-oxide-semiconductor M7Grid connect described 8th metal-oxide-semiconductor M8Grid；
Described 8th metal-oxide-semiconductor M8Drain electrode connect described second forward outfan iak +, described 8th metal-oxide-semiconductor M8Grid connect described 9th metal-oxide-semiconductor M9Grid；
Described 9th metal-oxide-semiconductor M9Drain electrode connect described first outside outfan ick +；
Described 9th metal-oxide-semiconductor M9Grid connect described tenth metal-oxide-semiconductor M10Grid；Described tenth Metal-oxide-semiconductor M10Drain electrode connect described first positive feedback outfan ifk +；
Described tenth metal-oxide-semiconductor M10Grid connect described 11st metal-oxide-semiconductor M11Grid；Described tenth One metal-oxide-semiconductor M11Drain electrode connect described 12nd metal-oxide-semiconductor M12Drain and gate；
Described 12nd metal-oxide-semiconductor M12Grid connect described 13rd metal-oxide-semiconductor M13Grid；Described 13 metal-oxide-semiconductor M13Drain electrode connect described second negative sense outfan iak -；
Described 13rd metal-oxide-semiconductor M13Grid connect described 14th metal-oxide-semiconductor M14Grid；Described 14 metal-oxide-semiconductor M14Drain electrode connect described first negative sense feedback output end ifk -；
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14Drain electrode all connect power supply；
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14Source grounding.
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12 Channel width-over-length ratio equal；
8th metal-oxide-semiconductor M8With the 13rd metal-oxide-semiconductor M13Channel width-over-length ratio be the 6th metal-oxide-semiconductor M6Ditch The a of road breadth length ratiokTimes；
9th metal-oxide-semiconductor M9Channel width-over-length ratio be the 6th metal-oxide-semiconductor M6The c of channel width-over-length ratiokTimes；
Tenth metal-oxide-semiconductor M10With the 14th metal-oxide-semiconductor M14Channel width-over-length ratio be the 6th metal-oxide-semiconductor M6Raceway groove The f of breadth length ratiokTimes.
The electric current of the forward outfan of described kth the first switched-current bilinear integrator and positive input Electric current between ratio and the negative sense outfan of described kth the first switched-current bilinear integrator Ratio between electric current and the electric current of negative input is
The electric current of the outside outfan of described kth the first switched-current bilinear integrator and positive input Electric current between ratio be
The electric current of the positive feedback outfan of described kth the first switched-current bilinear integrator is defeated with forward The current ratio entering end is
The electric current of the negative sense feedback output end of described kth the first switched-current bilinear integrator is defeated with forward The current ratio entering end is
As shown in Fig. 4-1 and Fig. 4-2, described second switch current bilinear integrator includes:
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20, the 21st metal-oxide-semiconductor M21, the 3rd just To input in +, the 3rd negative input in -, the second positive feedback outfan ifn +, second negative sense feedback output End ifn -, the second outside outfan icn +；
Described 15th metal-oxide-semiconductor M15Drain electrode connect described 16th metal-oxide-semiconductor M16Drain electrode, described 15 metal-oxide-semiconductor M15Grid and drain electrode by second clock φ2The switch controlled is connected, described 16th MOS Pipe M16Grid and drain electrode by the first clock φ1The switch controlled is connected；Described 15th metal-oxide-semiconductor M15's Drain electrode and the 3rd positive input in +By second clock φ2The switch controlled is connected, described 15th metal-oxide-semiconductor M15Drain electrode and the 3rd negative input in -By the first clock φ1The switch controlled is connected；
Described 16th metal-oxide-semiconductor M16Grid connect described 17th metal-oxide-semiconductor M17Grid；Described 17 metal-oxide-semiconductor M17Drain electrode connect described second outside outfan icn +；
Described 17th metal-oxide-semiconductor M17Grid connect described 18th metal-oxide-semiconductor M18Grid；Described 18 metal-oxide-semiconductor M18Drain electrode connect described second positive feedback outfan ifn +；
Described 18th metal-oxide-semiconductor M18Grid connect described 19th metal-oxide-semiconductor M19Grid；
Described 19th metal-oxide-semiconductor M19Drain electrode connect described 20th metal-oxide-semiconductor M20Drain and gate；
Described 20th metal-oxide-semiconductor M20Grid connect described 21st metal-oxide-semiconductor M21Grid；
Described 21st metal-oxide-semiconductor M21Drain electrode connect described second negative sense feedback output end ifn -；
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20With the 21st metal-oxide-semiconductor M21Drain electrode equal Connect power supply；
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20With the 21st metal-oxide-semiconductor M21Source electrode equal Ground connection.
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 19th metal-oxide-semiconductor M19With the 20th MOS Pipe M20Channel width-over-length ratio equal；17th metal-oxide-semiconductor M17Channel width-over-length ratio be the 15th metal-oxide-semiconductor M15CnTimes；18th metal-oxide-semiconductor M18With the 21st metal-oxide-semiconductor M21Channel width-over-length ratio be the 15th Metal-oxide-semiconductor M15FnTimes.
The electric current of the outside outfan of described second switch current bilinear integrator and the electricity of positive input Flow ratio value is
The electric current of the positive feedback outfan of described second switch current bilinear integrator and positive input Current ratio be
The electric current of the negative sense feedback output end of described second switch current bilinear integrator and positive input Current ratio be
The outside outfan of described first switched-current bilinear integrator and described second switch electric current two-wire The outside outfan of property integrator is the most connected, together as the output of described Switched-Current Filter, specifically For:
When the outside outfan of described first switched-current bilinear integrator exports negative value electric current, described The outside outfan of the first switched-current bilinear integrator connects the first negater circuit, described first reverse The outfan of circuit and other the first switched-current bilinear integrator and second switch current bilinear amass Divide all connected output together as described Switched-Current Filter of outside outfan of device；First is the most electric Road is reverse for the electric current exported by the outside outfan of described first switched-current bilinear integrator；
When the outside outfan of described second switch current bilinear integrator exports negative value electric current, described The outside outfan of second switch current bilinear integrator connects the second negater circuit, described second reverse The outfan of circuit and the outside outfan of the first switched-current bilinear integrator are all connected together as institute State the output of Switched-Current Filter；Second negater circuit is for amassing described second switch current bilinear The electric current dividing the outside outfan output of device is reverse.
As shown in Figure 6, a kind of leap-frogging multiloop feedback switch current filter, including:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for carrying out respectively external input signal replicating with reverse, generation n is just To output signal, n negative sense output signal；Input is connected with external input signal；Front n-1 is described just Positive input to output signal n-1 corresponding with sequence number respectively the first switched-current bilinear integrator It is connected, front n-1 described negative sense output signal n-1 corresponding with sequence number respectively the first switched-current bilinear The negative input of integrator is connected；Forward output signal described in n-th and described second switch electric current two-wire Property integrator positive input be connected, negative sense output signal described in n-th and described second switch electric current are double The negative input of line integral device is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan and negative sense feedback output end；Wherein, serial number 1 The described forward outfan of described first switched-current bilinear integrator to n-2 exports respectively to cascade The positive input of next the first switched-current bilinear integrator, described first switch of serial number 1 to n-2 The described negative sense outfan of current bilinear integrator exports to next first switching current of cascade double respectively The negative input of line integral device；The institute of the described first switched-current bilinear integrator of serial number n-1 State forward outfan and export the positive input to second switch current bilinear integrator, serial number n-1 The described negative sense outfan output of described first switched-current bilinear integrator is electric to the second switch of cascade The negative input of stream bilinear integrators；Serial number 2 is to the described first switched-current bilinear integration of n-1 The described positive feedback outfan of device exports the upper one first switched-current bilinear integrator to cascade respectively Negative input, the described negative sense of the described first switched-current bilinear integrator of serial number 2 to n-1 is anti- Feedback outfan exports the positive input of the upper one first switched-current bilinear integrator to cascade respectively, The positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 exports to serial number 1 The negative input of described first switched-current bilinear integrator, the described first switch electricity of serial number 1 The negative sense feedback output end of stream bilinear integrators exports described first switched-current bilinear to serial number 1 The positive input of integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators, outside outfan is the output of described Switched-Current Filter.
As shown in Fig. 7-1 and Fig. 7-2, described current mirroring circuit includes:
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe Mcj, first input end Iin, n the first forward output signal icj +, n the first negative sense output signal icj -；J is the nature more than or equal to 0 and less than or equal to n-1 Number；
Described first metal-oxide-semiconductor M1Drain electrode connect first input end Iin, described first metal-oxide-semiconductor M1Grid It is connected with drain electrode；
Described first metal-oxide-semiconductor M1Grid connect n described negative sense feedback output mos pipe M respectivelycjGrid Pole；N described negative sense feedback output mos pipe McjDrain electrode to connect sequence number respectively the most described first negative To output signal icj -；
Described first metal-oxide-semiconductor M1Grid connect described second metal-oxide-semiconductor M2Grid；
Described second metal-oxide-semiconductor M2Drain electrode connect described 3rd metal-oxide-semiconductor M3Drain and gate；
Described 3rd metal-oxide-semiconductor M3Grid connect n described positive feedback output mos pipe M respectivelydjGrid Pole；N described positive feedback output mos pipe MdjDrain electrode just connecting sequence number the most described first respectively To output signal icj +；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe McjDrain electrode all connect power supply；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe McjSource grounding.
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2With the 3rd metal-oxide-semiconductor M3Channel width-over-length ratio equal；
The positive feedback output mos pipe M that sequence number is identicaldjOutput mos pipe M is fed back with negative sensecjRaceway groove width Long ratio is equal, and is the first metal-oxide-semiconductor M1CjTimes.
As shown in Fig. 8-1 and Fig. 8-2, described first switched-current bilinear integrator includes:
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th Metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the second forward Input ik +, the second negative input ik -, the second forward outfan iak +, the second negative sense outfan iak -, One positive feedback outfan ifk +With the first negative sense feedback output end ifk -；K is the first switched-current bilinear integration The sequence number of device, is greater than 0 natural number less than or equal to n-1；
Described 4th metal-oxide-semiconductor M4Drain electrode connect described 5th metal-oxide-semiconductor M5Drain electrode；Described 4th Metal-oxide-semiconductor M4Grid and drain electrode by second clock φ2The first switch controlled is connected；Described 4th metal-oxide-semiconductor M4Drain electrode and the second positive input ik +By second clock φ2The second switch controlled is connected；Described 4th Metal-oxide-semiconductor M4Drain electrode and the second negative input ik -By the first clock φ1The 3rd switch controlled is connected；φ1With φ2For two-phase non-overlapp-ing clock, clock waveform is as shown in Figure 10.
Described 5th metal-oxide-semiconductor M5Grid and drain electrode by the first clock φ1The 4th switch controlled is connected；Institute State the 5th metal-oxide-semiconductor M5Grid connect described 6th metal-oxide-semiconductor M6Grid；
Described 6th metal-oxide-semiconductor M6Drain electrode connect described second forward outfan iak +, described 6th metal-oxide-semiconductor M6Grid connect described 7th metal-oxide-semiconductor M7Grid；
Described 7th metal-oxide-semiconductor M7Drain electrode connect described first positive feedback outfan ifk +；
Described 7th metal-oxide-semiconductor M7Grid connect described 8th metal-oxide-semiconductor M8Grid；Described 8th Metal-oxide-semiconductor M8Drain electrode connect described 9th metal-oxide-semiconductor M9Drain and gate；
Described 9th metal-oxide-semiconductor M9Grid connect described tenth metal-oxide-semiconductor M10Grid；Described tenth Metal-oxide-semiconductor M10Drain electrode connect described second negative sense outfan iak -；
Described tenth metal-oxide-semiconductor M10Grid connect described 11st metal-oxide-semiconductor M11Grid；Described tenth One metal-oxide-semiconductor M11Drain electrode connect described first negative sense feedback output end ifk -；
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, Eight metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11Drain electrode equal Connect power supply；
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th Metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11Source electrode all connect Ground.
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9Raceway groove Breadth length ratio is equal；
6th metal-oxide-semiconductor M6With the tenth metal-oxide-semiconductor M10Channel width-over-length ratio be the 4th metal-oxide-semiconductor M4Raceway groove The a of breadth length ratiokTimes；
7th metal-oxide-semiconductor M7With the 11st metal-oxide-semiconductor M11Channel width-over-length ratio be the 4th metal-oxide-semiconductor M4Raceway groove The f of breadth length ratiokTimes.
The electric current of the forward outfan of described kth the first switched-current bilinear integrator and positive input Electric current between ratio and the negative sense outfan of described kth the first switched-current bilinear integrator Ratio between electric current and the electric current of negative input is
The electric current of the positive feedback outfan of described kth the first switched-current bilinear integrator is defeated with forward The current ratio entering end is
The electric current of the negative sense feedback output end of described kth the first switched-current bilinear integrator is defeated with forward The current ratio entering end is
As shown in Fig. 9-1 and Fig. 9-2, described second switch current bilinear integrator includes:
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th metal-oxide-semiconductor M18, the 3rd forward Input in +, the 3rd negative input in -, the second positive feedback outfan ifn +, the second negative sense feedback output end ifn -, outside outfan ian +；
Described 12nd metal-oxide-semiconductor M12Drain electrode connect described 13rd metal-oxide-semiconductor M13Drain electrode, described 12 metal-oxide-semiconductor M12Grid and drain electrode by second clock φ2The switch controlled is connected, described 13rd MOS Pipe M13Grid and drain electrode by the first clock φ1The switch controlled is connected；Described 12nd metal-oxide-semiconductor M12's Drain electrode and the 3rd positive input in +By second clock φ2The switch controlled is connected, described 12nd metal-oxide-semiconductor M12Drain electrode and the 3rd negative input in -By the first clock φ1The switch controlled is connected；
Described 13rd metal-oxide-semiconductor M13Grid connect described 14th metal-oxide-semiconductor M14Grid；Described 14 metal-oxide-semiconductor M14Drain electrode connect described outside outfan ian +；
Described 14th metal-oxide-semiconductor M14Grid connect described 15th metal-oxide-semiconductor M15Grid, described 15 metal-oxide-semiconductor M15Drain electrode connect described second positive feedback outfan ifn +；
Described 15th metal-oxide-semiconductor M15Grid connect described 16th metal-oxide-semiconductor M16Grid；
Described 16th metal-oxide-semiconductor M16Drain electrode connect described 17th metal-oxide-semiconductor M17Drain and gate；
Described 17th metal-oxide-semiconductor M17Grid connect described 18th metal-oxide-semiconductor M18Grid；
Described 18th metal-oxide-semiconductor M18Drain electrode connect described second negative sense feedback output end ifn -；
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17With the 18th metal-oxide-semiconductor M18Drain electrode all connect Power supply；
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17With the 18th metal-oxide-semiconductor M18Source electrode all connect Ground.
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 16th metal-oxide-semiconductor M16With the 17th MOS Pipe M17Channel width-over-length ratio equal；14th metal-oxide-semiconductor M14Channel width-over-length ratio be the 12nd metal-oxide-semiconductor M12AnTimes；15th metal-oxide-semiconductor M15With the 18th metal-oxide-semiconductor M18Channel width-over-length ratio be the 12nd Metal-oxide-semiconductor M12FnTimes.
The electric current of the outside outfan of described second switch current bilinear integrator and the electricity of positive input Flow ratio value is
The electric current of the positive feedback outfan of described second switch current bilinear integrator and positive input Current ratio be
The electric current of the negative sense feedback output end of described second switch current bilinear integrator and positive input Current ratio be
Shown in Fig. 1 and Fig. 6 two kind Switched-Current Filter structure has identical leap-frogging negative feedback and connects Mode, it may be assumed that
Serial number 2 is divided to the described positive feedback outfan of the described first switched-current bilinear integrator of n-1 Shu Chu be to the negative input of the upper one first switched-current bilinear integrator of cascade, serial number 2 to n-1 The described negative sense feedback output end of described first switched-current bilinear integrator export respectively to cascade The positive input of upper one first switched-current bilinear integrator, described first switching current of serial number 1 The positive feedback outfan output of bilinear integrators is amassed to described first switched-current bilinear of serial number 1 Dividing the negative input of device, the negative sense feedback of the described first switched-current bilinear integrator of serial number 1 is defeated Go out end and export the positive input of the described first switched-current bilinear integrator to serial number 1；
The positive feedback outfan output of second switch current bilinear integrator is opened to the first of serial number n-1 Close the negative input of current bilinear integrator, the negative sense feedback of second switch current bilinear integrator Outfan exports the positive input of the first switched-current bilinear integrator to serial number n-1.
The invention have the benefit that
Employing Standard Digital CMOS realizes, and has that dynamic range is big, design process simple, without mould Number converter, be suitable to the advantages such as Low-voltage Low-power large-scale integrated；Can accurate integrated analog filter Time constant, thus accurately realize the Frequency Response of analog filter；Utilization has leap-frogging negative feedback and props up The switched-current integrator cascade structure structure wave filter on road, can effectively shorten Switched-Current Filter feedback The length of path, and reduce the circuit sensitivity of Switched-Current Filter.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not Being confined to this, any those familiar with the art, can in the technical scope that the invention discloses The change readily occurred in or replacement, all should contain within protection scope of the present invention.Therefore, the present invention Protection domain should be as the criterion with scope of the claims.

Claims (10)

1. a leap-frogging multiloop feedback switch current filter, it is characterised in that including:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for external input signal carries out equivalent duplication and reverse respectively, generates Forward output signal, negative sense output signal；Input is connected with external input signal, and described forward exports Signal is connected with the positive input of the described first switched-current bilinear integrator of serial number 1, described negative Negative input to output signal with the described first switched-current bilinear integrator of serial number 1 is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan, negative sense feedback output end and outside outfan； Wherein, serial number 1 is to the described forward outfan difference of the described first switched-current bilinear integrator of n-2 The positive input of output extremely next the first switched-current bilinear integrator of cascade, serial number 1 arrives n-2's The described negative sense outfan of described first switched-current bilinear integrator export respectively to cascade next the The negative input of one switched-current bilinear integrator；The described first switching current two-wire of serial number n-1 Property integrator described forward outfan output to second switch current bilinear integrator forward input End, the described negative sense outfan of the described first switched-current bilinear integrator of serial number n-1 exports to level The negative input of the second switch current bilinear integrator of connection；Serial number 2 is to described first switch of n-1 The described positive feedback outfan of current bilinear integrator exports the upper one first switch electricity to cascade respectively The negative input of stream bilinear integrators, the described first switched-current bilinear integration of serial number 2 to n-1 The described negative sense feedback output end of device exports the upper one first switched-current bilinear integrator to cascade respectively Positive input, the positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 Export the negative input of the described first switched-current bilinear integrator to serial number 1, serial number 1 The negative sense feedback output end of described first switched-current bilinear integrator exports to described the first of serial number 1 The positive input of switched-current bilinear integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators；
The outside outfan of n-1 described first switched-current bilinear integrator and described second switch electric current The outside outfan of bilinear integrators is the most connected, together as the output of described Switched-Current Filter.
Leap-frogging multiloop feedback switch current filter the most according to claim 1, its feature exists In, described current mirroring circuit includes:
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th Metal-oxide-semiconductor M5, first input end Iin, the first negative sense outfan ia0 -With the first forward outfan ia0 +；
Second metal-oxide-semiconductor M2Grid connect the first metal-oxide-semiconductor M respectively1Grid and drain electrode, and connect first Input Iin；Second metal-oxide-semiconductor M2Drain electrode connect the first negative sense outfan ia0 -；Described second metal-oxide-semiconductor M2 Grid connect described 3rd metal-oxide-semiconductor M3Grid；
Described 3rd metal-oxide-semiconductor M3Drain electrode connect described 4th metal-oxide-semiconductor M4Grid and drain electrode；Described Four metal-oxide-semiconductor M4Grid connect described 5th metal-oxide-semiconductor M5Grid；
Described 5th metal-oxide-semiconductor M5Drain electrode connect described first forward outfan ia0 +；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th Metal-oxide-semiconductor M5Drain electrode all connect power supply；First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, the 4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5Source grounding.
Leap-frogging multiloop feedback switch current filter the most according to claim 1, its feature exists In, described first switched-current bilinear integrator includes:
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14, the second positive input ik +, the second negative input ik -, the second forward outfan iak +、 Second negative sense outfan iak -, the first positive feedback outfan ifk +, the first negative sense feedback output end ifk -With first Outside outfan ick +；K is the sequence number of the first switched-current bilinear integrator, be greater than 0 less than or etc. Natural number in n-1；
Described 6th metal-oxide-semiconductor M6Drain electrode connect described 7th metal-oxide-semiconductor M7Drain electrode；Described 6th Metal-oxide-semiconductor M6Grid with drain electrode by second clock control first switch be connected；Described 6th metal-oxide-semiconductor M6 Drain electrode and the second positive input ik +The second switch controlled by second clock is connected；Described 6th MOS Pipe M6Drain electrode and the second negative input ik -It is connected by the 3rd switch of the first clock control；
Described 7th metal-oxide-semiconductor M7Grid with drain electrode by the first clock control the 4th switch be connected；Described 7th metal-oxide-semiconductor M7Grid connect described 8th metal-oxide-semiconductor M8Grid；
Described 8th metal-oxide-semiconductor M8Drain electrode connect described second forward outfan iak +, described 8th metal-oxide-semiconductor M8Grid connect described 9th metal-oxide-semiconductor M9Grid；
Described 9th metal-oxide-semiconductor M9Drain electrode connect described first outside outfan ick +；
Described 9th metal-oxide-semiconductor M9Grid connect described tenth metal-oxide-semiconductor M10Grid；Described tenth Metal-oxide-semiconductor M10Drain electrode connect described first positive feedback outfan ifk +；
Described tenth metal-oxide-semiconductor M10Grid connect described 11st metal-oxide-semiconductor M11Grid；Described tenth One metal-oxide-semiconductor M11Drain electrode connect described 12nd metal-oxide-semiconductor M12Drain and gate；
Described 12nd metal-oxide-semiconductor M12Grid connect described 13rd metal-oxide-semiconductor M13Grid；Described 13 metal-oxide-semiconductor M13Drain electrode connect described second negative sense outfan iak -；
Described 13rd metal-oxide-semiconductor M13Grid connect described 14th metal-oxide-semiconductor M14Grid；Described 14 metal-oxide-semiconductor M14Drain electrode connect described first negative sense feedback output end ifk -；
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14Drain electrode all connect power supply；
6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth Metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the 12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the tenth Four metal-oxide-semiconductor M14Source grounding.
Leap-frogging multiloop feedback switch current filter the most according to claim 1, its feature exists In, described second switch current bilinear integrator includes:
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20, the 21st metal-oxide-semiconductor M21, the 3rd just To input in +, the 3rd negative input in -, the second positive feedback outfan ifn +, second negative sense feedback output End ifn -, the second outside outfan icn +；
Described 15th metal-oxide-semiconductor M15Drain electrode connect described 16th metal-oxide-semiconductor M16Drain electrode, described 15 metal-oxide-semiconductor M15Grid be connected with the switch that controlled by second clock of drain electrode, described 16th metal-oxide-semiconductor M16Grid with drain electrode be connected by the switch of the first clock control；Described 15th metal-oxide-semiconductor M15Drain electrode With the 3rd positive input in +The switch controlled by second clock is connected, described 15th metal-oxide-semiconductor M15Leakage Pole and the 3rd negative input in -It is connected by the switch of the first clock control；
Described 16th metal-oxide-semiconductor M16Grid connect described 17th metal-oxide-semiconductor M17Grid；Described 17 metal-oxide-semiconductor M17Drain electrode connect described second outside outfan icn +；
Described 17th metal-oxide-semiconductor M17Grid connect described 18th metal-oxide-semiconductor M18Grid；Described 18 metal-oxide-semiconductor M18Drain electrode connect described second positive feedback outfan ifn +；
Described 18th metal-oxide-semiconductor M18Grid connect described 19th metal-oxide-semiconductor M19Grid；
Described 19th metal-oxide-semiconductor M19Drain electrode connect described 20th metal-oxide-semiconductor M20Drain and gate；
Described 20th metal-oxide-semiconductor M20Grid connect described 21st metal-oxide-semiconductor M21Grid；
Described 21st metal-oxide-semiconductor M21Drain electrode connect described second negative sense feedback output end ifn -；
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20With the 21st metal-oxide-semiconductor M21Drain electrode equal Connect power supply；
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th MOS Pipe M18, the 19th metal-oxide-semiconductor M19, the 20th metal-oxide-semiconductor M20With the 21st metal-oxide-semiconductor M21Source electrode equal Ground connection.
Leap-frogging multiloop feedback switch current filter the most according to claim 4, its feature exists In,
15th metal-oxide-semiconductor M15, the 16th metal-oxide-semiconductor M16, the 19th metal-oxide-semiconductor M19With the 20th MOS Pipe M20Channel width-over-length ratio equal；17th metal-oxide-semiconductor M17Channel width-over-length ratio be the 15th metal-oxide-semiconductor M15CnTimes；18th metal-oxide-semiconductor M18With the 21st metal-oxide-semiconductor M21Channel width-over-length ratio be the 15th Metal-oxide-semiconductor M15FnTimes.
Leap-frogging multiloop feedback switch current filter the most according to claim 1, its feature exists In,
The outside outfan of described first switched-current bilinear integrator and described second switch electric current two-wire The outside outfan of property integrator is the most connected, together as the output of described Switched-Current Filter, specifically For:
When the outside outfan of described first switched-current bilinear integrator exports negative value electric current, described The outside outfan of the first switched-current bilinear integrator connects the first negater circuit, described first reverse The outfan of circuit and other the first switched-current bilinear integrator and second switch current bilinear amass Divide all connected output together as described Switched-Current Filter of outside outfan of device；First is the most electric Road is reverse for the electric current exported by the outside outfan of described first switched-current bilinear integrator；
When the outside outfan of described second switch current bilinear integrator exports negative value electric current, described The outside outfan of second switch current bilinear integrator connects the second negater circuit, described second reverse The outfan of circuit and the outside outfan of the first switched-current bilinear integrator are all connected together as institute State the output of Switched-Current Filter；Second negater circuit is for amassing described second switch current bilinear The electric current dividing the outside outfan output of device is reverse.
7. a leap-frogging multiloop feedback switch current filter, it is characterised in that including:
The current mirroring circuit sequentially cascaded, n-1 the first switched-current bilinear integrator and 1 second switch Current bilinear integrator；N is the integer more than 1；
Described current mirroring circuit, for carrying out respectively external input signal replicating with reverse, generation n is just To output signal, n negative sense output signal；Input is connected with external input signal；Front n-1 is described just Positive input to output signal n-1 corresponding with sequence number respectively the first switched-current bilinear integrator It is connected, front n-1 described negative sense output signal n-1 corresponding with sequence number respectively the first switched-current bilinear The negative input of integrator is connected；Forward output signal described in n-th and described second switch electric current two-wire Property integrator positive input be connected, negative sense output signal described in n-th and described second switch electric current are double The negative input of line integral device is connected；
Described first switched-current bilinear integrator, for being integrated electric current；Input includes: Positive input, negative input；The outfan of described first switched-current bilinear integrator just includes To outfan, negative sense outfan, positive feedback outfan and negative sense feedback output end；Wherein, serial number 1 The described forward outfan of described first switched-current bilinear integrator to n-2 exports respectively to cascade The positive input of next the first switched-current bilinear integrator, described first switch of serial number 1 to n-2 The described negative sense outfan of current bilinear integrator exports to next first switching current of cascade double respectively The negative input of line integral device；The institute of the described first switched-current bilinear integrator of serial number n-1 State forward outfan and export the positive input to second switch current bilinear integrator, serial number n-1 The described negative sense outfan output of described first switched-current bilinear integrator is electric to the second switch of cascade The negative input of stream bilinear integrators；Serial number 2 is to the described first switched-current bilinear integration of n-1 The described positive feedback outfan of device exports the upper one first switched-current bilinear integrator to cascade respectively Negative input, the described negative sense of the described first switched-current bilinear integrator of serial number 2 to n-1 is anti- Feedback outfan exports the positive input of the upper one first switched-current bilinear integrator to cascade respectively, The positive feedback outfan of the described first switched-current bilinear integrator of serial number 1 exports to serial number 1 The negative input of described first switched-current bilinear integrator, the described first switch electricity of serial number 1 The negative sense feedback output end of stream bilinear integrators exports described first switched-current bilinear to serial number 1 The positive input of integrator；
Described second switch current bilinear integrator, for being integrated electric current, input includes: Positive input, negative input；Positive input and the described first switching current two-wire of serial number n-1 Property integrator forward outfan be connected, described first switching current of negative input and serial number n-1 is double The negative sense outfan of line integral device is connected；Outfan includes: positive feedback outfan, negative sense feedback is defeated Go out end and outside outfan；Wherein, positive feedback outfan exports the first switching current to serial number n-1 The negative input of bilinear integrators, the first switch electricity of negative sense feedback output end output to serial number n-1 The positive input of stream bilinear integrators, outside outfan is the output of described Switched-Current Filter.
Leap-frogging multiloop feedback switch current filter the most according to claim 7, its feature exists In, described current mirroring circuit includes:
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe Mcj, first input end Iin, n the first forward output signal icj +, n the first negative sense output signal icj -；J is the nature more than or equal to 0 and less than or equal to n-1 Number；
Described first metal-oxide-semiconductor M1Drain electrode connect first input end Iin, described first metal-oxide-semiconductor M1Grid It is connected with drain electrode；
Described first metal-oxide-semiconductor M1Grid connect n described negative sense feedback output mos pipe M respectivelycjGrid Pole；N described negative sense feedback output mos pipe McjDrain electrode to connect sequence number respectively the most described first negative To output signal icj -；
Described first metal-oxide-semiconductor M1Grid connect described second metal-oxide-semiconductor M2Grid；
Described second metal-oxide-semiconductor M2Drain electrode connect described 3rd metal-oxide-semiconductor M3Drain and gate；
Described 3rd metal-oxide-semiconductor M3Grid connect n described positive feedback output mos pipe M respectivelydjGrid Pole；N described positive feedback output mos pipe MdjDrain electrode just connecting sequence number the most described first respectively To output signal icj +；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe McjDrain electrode all connect power supply；
First metal-oxide-semiconductor M1, the second metal-oxide-semiconductor M2, the 3rd metal-oxide-semiconductor M3, n positive feedback output mos Pipe Mdj, n negative sense feedback output mos pipe McjSource grounding.
Leap-frogging multiloop feedback switch current filter the most according to claim 7, its feature exists In, described first switched-current bilinear integrator includes:
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th Metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11, the second forward Input ik +, the second negative input ik -, the second forward outfan iak +, the second negative sense outfan iak -, One positive feedback outfan ifk +With the first negative sense feedback output end ifk -；K is the first switched-current bilinear integration The sequence number of device, is greater than 0 natural number less than or equal to n-1；
Described 4th metal-oxide-semiconductor M4Drain electrode connect described 5th metal-oxide-semiconductor M5Drain electrode；Described 4th Metal-oxide-semiconductor M4Grid with drain electrode by second clock control first switch be connected；Described 4th metal-oxide-semiconductor M4 Drain electrode and the second positive input ik +The second switch controlled by second clock is connected；Described 4th MOS Pipe M4Drain electrode and the second negative input ik -It is connected by the 3rd switch of the first clock control；
Described 5th metal-oxide-semiconductor M5Grid with drain electrode by the first clock control the 4th switch be connected；Described 5th metal-oxide-semiconductor M5Grid connect described 6th metal-oxide-semiconductor M6Grid；
Described 6th metal-oxide-semiconductor M6Drain electrode connect described second forward outfan iak +, described 6th metal-oxide-semiconductor M6Grid connect described 7th metal-oxide-semiconductor M7Grid；
Described 7th metal-oxide-semiconductor M7Drain electrode connect described first positive feedback outfan ifk +；
Described 7th metal-oxide-semiconductor M7Grid connect described 8th metal-oxide-semiconductor M8Grid；Described 8th Metal-oxide-semiconductor M8Drain electrode connect described 9th metal-oxide-semiconductor M9Drain and gate；
Described 9th metal-oxide-semiconductor M9Grid connect described tenth metal-oxide-semiconductor M10Grid；Described tenth Metal-oxide-semiconductor M10Drain electrode connect described second negative sense outfan iak -；
Described tenth metal-oxide-semiconductor M10Grid connect described 11st metal-oxide-semiconductor M11Grid；Described tenth One metal-oxide-semiconductor M11Drain electrode connect described first negative sense feedback output end ifk -；
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th Metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11Drain electrode all connect Power supply；
4th metal-oxide-semiconductor M4, the 5th metal-oxide-semiconductor M5, the 6th metal-oxide-semiconductor M6, the 7th metal-oxide-semiconductor M7, the 8th Metal-oxide-semiconductor M8, the 9th metal-oxide-semiconductor M9, the tenth metal-oxide-semiconductor M10, the 11st metal-oxide-semiconductor M11Source electrode all connect Ground.
Leap-frogging multiloop feedback switch current filter the most according to claim 7, its feature exists In, described second switch current bilinear integrator includes:
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17, the 18th metal-oxide-semiconductor M18, the 3rd forward Input in +, the 3rd negative input in -, the second positive feedback outfan ifn +, the second negative sense feedback output end ifn -, outside outfan ian +；
Described 12nd metal-oxide-semiconductor M12Drain electrode connect described 13rd metal-oxide-semiconductor M13Drain electrode, described 12 metal-oxide-semiconductor M12Grid be connected with the switch that controlled by second clock of drain electrode, described 13rd metal-oxide-semiconductor M13Grid with drain electrode be connected by the switch of the first clock control；Described 12nd metal-oxide-semiconductor M12Drain electrode With the 3rd positive input in +The switch controlled by second clock is connected, described 12nd metal-oxide-semiconductor M12Leakage Pole and the 3rd negative input in -It is connected by the switch of the first clock control；
Described 13rd metal-oxide-semiconductor M13Grid connect described 14th metal-oxide-semiconductor M14Grid；Described 14 metal-oxide-semiconductor M14Drain electrode connect described outside outfan ian +；
Described 14th metal-oxide-semiconductor M14Grid connect described 15th metal-oxide-semiconductor M15Grid, described 15 metal-oxide-semiconductor M15Drain electrode connect described second positive feedback outfan ifn +；
Described 15th metal-oxide-semiconductor M15Grid connect described 16th metal-oxide-semiconductor M16Grid；
Described 16th metal-oxide-semiconductor M16Drain electrode connect described 17th metal-oxide-semiconductor M17Drain and gate；
Described 17th metal-oxide-semiconductor M17Grid connect described 18th metal-oxide-semiconductor M18Grid；
Described 18th metal-oxide-semiconductor M18Drain electrode connect described second negative sense feedback output end ifn -；
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17With the 18th metal-oxide-semiconductor M18Drain electrode all connect Power supply；
12nd metal-oxide-semiconductor M12, the 13rd metal-oxide-semiconductor M13, the 14th metal-oxide-semiconductor M14, the 15th MOS Pipe M15, the 16th metal-oxide-semiconductor M16, the 17th metal-oxide-semiconductor M17With the 18th metal-oxide-semiconductor M18Source electrode all connect Ground.
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