CN106209021A - Current mode active filter circuit and signal processing method - Google Patents
Current mode active filter circuit and signal processing method Download PDFInfo
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- CN106209021A CN106209021A CN201610671848.6A CN201610671848A CN106209021A CN 106209021 A CN106209021 A CN 106209021A CN 201610671848 A CN201610671848 A CN 201610671848A CN 106209021 A CN106209021 A CN 106209021A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
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Abstract
The invention provides a kind of current mode active filter circuit and signal processing method, described current mode active filter circuit includes filter unit, transconductance cell and current lens unit.Current lens unit, is used for so that current mode active filter circuit is operated in current field；Filter unit, for input signal is filtered process, and forms the first limit of current mode active filter circuit amplitude-frequency response；Transconductance cell, for being collectively forming and the second limit of the first limit conjugation with current lens unit, so that the output signal of unit filtering is quickly roll-offed outside the band of described filter unit after filtering, improve the rejection ability to DAC clock mirror image signal, extend current mode filter circuit range of application in the middle of various protocol systems.
Description
Technical field
The present invention relates to electronic technology field, at a kind of current mode active filter circuit and signal
Reason method.
Background technology
Existing wave filter mostly is voltage-type wave filter, and most of circuit structure, such as digital to analog converter (DAC), upper change
Frequency mixer (Mixer) etc. is operated in current field more, therefore, when voltage-type wave filter and the circuit being operated in current field are tied
When structure collocation uses, two ends before and after voltage-type wave filter are needed to insert current-voltage conversion circuit and electricity piezo-electric respectively
Stream change-over circuit, this makes overall link structure become complicated, adds power consumption.
But, the current mode wave filter used in prior art can not realize specifically, such as Butterworth, Chebyshev
Deng response, band is outer to roll-off slowly, and the suppression to DAC clock mirror image signal is limited, limits wave filter higher in some requirements
System in application.
Summary of the invention
It is an object of the invention to provide a kind of current mode active filter circuit, while it can operate at current field,
Realize quickly roll-offing outside band, improve the rejection ability to DAC clock mirror image signal.
Another object of the present invention is to provide the processing method of a kind of signal, be applied to current mode active filter circuit,
Use the method so that while current mode active filter circuit works in current field, it is achieved band is outer quickly to roll-off, and improves
Rejection ability to DAC clock mirror image signal.
First aspect, embodiments provides a kind of current mode active filter circuit, and it includes filter unit, mutual conductance
Unit and current lens unit.The outfan of described filter unit respectively with the input of described transconductance cell and described electric current
The input electrical connection of mirror unit, the outfan of described transconductance cell electrically connects with the control end of described current lens unit.Described
Current lens unit, is used for so that described current mode active filter circuit is operated in current field；Described filter unit, for input
Signal is filtered processing, and forms the first limit of described current mode active filter circuit amplitude-frequency response；Described transconductance cell,
For being collectively forming and the second limit of described first limit conjugation with described current lens unit, so that through described filter unit
The output signal of filtering is quickly roll-offed outside the band of described filter unit.
In preferred embodiment of the present invention, described transconductance cell is operational amplifier or comparator.
In preferred embodiment of the present invention, described filter unit includes resistance R and the first electric capacity C1, described first electricity
Hold C1One end ground connection, the other end is in parallel with one end of described resistance R, the other end of described resistance R respectively with described transconductance cell
Input and described current lens unit input electrical connection.
In preferred embodiment of the present invention, described current lens unit include the first metal-oxide-semiconductor field effect transistor subelement, second
Metal-oxide-semiconductor field effect transistor subelement and the second electric capacity C2, described first metal-oxide-semiconductor field effect transistor subelement includes a metal-oxide-semiconductor field effect transistor,
Described second metal-oxide-semiconductor field effect transistor subelement includes a metal-oxide-semiconductor field effect transistor.
In preferred embodiment of the present invention, described first metal-oxide-semiconductor field effect transistor subelement includes the first metal-oxide-semiconductor field effect transistor
M2, the second metal-oxide-semiconductor field effect transistor subelement include the second metal-oxide-semiconductor field effect transistor M3, the input of described first metal-oxide-semiconductor field effect transistor M2 with
The outfan electrical connection of described filter unit, the grid of described first metal-oxide-semiconductor field effect transistor M2 and described second metal-oxide-semiconductor field effect transistor M3
Grid electrical connection, the grid of the outfan of described transconductance cell and described first metal-oxide-semiconductor field effect transistor M2 and described 2nd MOS
The grid electrical connection of field effect transistor M3, described second electric capacity C2Grid and described for described first metal-oxide-semiconductor field effect transistor M2
The common of the grid of two metal-oxide-semiconductor field effect transistor M3 arrives ground electric capacity.
In preferred embodiment of the present invention, the mutual conductance of described first metal-oxide-semiconductor field effect transistor M2 is gm2, described transconductance cell
Mutual conductance is gm1, the gain of described mirror image unit is G, and the three dB bandwidth of described current mode active filter circuit and quality factor are respectively
For ω0And Q, the transfer function of described current mode active filter circuit
In preferred embodiment of the present invention, described first metal-oxide-semiconductor field effect transistor M2 and described second metal-oxide-semiconductor field effect transistor M3 is
P-channel metal-oxide-semiconductor field effect transistor.
In preferred embodiment of the present invention, described first metal-oxide-semiconductor field effect transistor M2 and described second metal-oxide-semiconductor field effect transistor M3's
Equivalently-sized.
In preferred embodiment of the present invention, described input signal is differential signal
Second aspect, embodiments provides the processing method of a kind of signal, is applied to current mode active power filtering electricity
Road, described active filter circuit includes filter unit, transconductance cell and current lens unit；The outfan of described filter unit divides
Do not electrically connect with the input of the input of described transconductance cell and described current lens unit, the outfan of described transconductance cell
Electrically connect with the control end of described current lens unit；Described method includes: described current lens unit so that described current mode is active
Filter circuit is operated in current field；Described filter unit receives current input signal；Described filter unit, is carried out input signal
Filtering Processing, and form the first limit of described current mode active filter circuit amplitude-frequency response；Described transconductance cell, with described electricity
Stream mirror unit is collectively forming and the second limit of described first limit conjugation, so that the output through described filtering unit filters is believed
Number quickly roll-off outside the band of described filter unit.
The embodiment of the present invention provides the benefit that: embodiments provide a kind of current mode active filter circuit and
Signal processing method, described current mode active filter circuit includes filter unit, transconductance cell and current lens unit；Described electricity
Stream mirror unit, is used for so that described current mode active filter circuit is operated in current field；Described filter unit, for input letter
Number it is filtered processing, and forms the first limit of described current mode active filter circuit amplitude-frequency response；Described transconductance cell, uses
In being collectively forming and the second limit of described first limit conjugation, so that filtering through described filter unit with described current lens unit
The output signal of ripple is quickly roll-offed outside the band of described filter unit, improves the rejection ability to DAC clock mirror image signal, extension
Current mode filter circuit range of application in the middle of various protocol systems.
Other features and advantages of the present invention will illustrate in description subsequently, and, partly become from description
It is clear that or understand by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by saying of being write
Structure specifically noted in bright book, claims and accompanying drawing realizes and obtains.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below by embodiment required use attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, and it is right to be therefore not construed as
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this
A little accompanying drawings obtain other relevant accompanying drawings.
The module diagram of the current mode active filter circuit that Fig. 1 provides for the embodiment of the present invention；
The schematic diagram of the filter unit of the current mode active filter circuit that Fig. 2 provides for the embodiment of the present invention；
The schematic diagram of the transconductance cell of the current mode active filter circuit that Fig. 3 provides for the embodiment of the present invention；
The circuit structure diagram of the current mode active filter circuit that Fig. 4 provides for the embodiment of the present invention；
Fig. 5 is the amplitude frequency curve figure of Butterworth function and chebyshev function；
The flow chart of the signal processing method that Fig. 6 provides for the embodiment of the present invention.
In figure:
Current mode filter circuit 100；
Filter unit 110；Transconductance cell 120；Current lens unit 130.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Generally implement with the present invention illustrated described in accompanying drawing herein
The assembly of example can be arranged with various different configurations and design.
Therefore, detailed description to the embodiments of the invention provided in the accompanying drawings is not intended to limit claimed below
The scope of the present invention, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under not making creative work premise, broadly falls into the model of present invention protection
Enclose.
It should also be noted that similar label and letter represent similar terms, therefore, the most a certain Xiang Yi in following accompanying drawing
Individual accompanying drawing is defined, then need not it be defined further and explains in accompanying drawing subsequently.
In describing the invention, it should be noted that term " " center ", " on ", D score, "left", "right", " vertically ",
Orientation or the position relationship of the instruction such as " level ", " interior ", " outward " are based on orientation shown in the drawings or position relationship, or should
The orientation usually put during the use of invention product or position relationship, be for only for ease of the description present invention and simplify description, and not
It is to indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, the most not
It is understood that as limitation of the present invention.Describe additionally, term " first ", " second ", " the 3rd " etc. are only used for distinguishing, and can not manage
Solve as instruction or hint relative importance.
Additionally, the term such as term " level ", " vertically ", " pendency " is not offered as requiring parts abswolute level or pendency, and
It is to be slightly tilted.As " level " only refers to for its direction relatively " vertically " more level, it it is not this structure of expression
Must be perfectly level, but can be slightly tilted.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " arrange ",
" install ", " being connected ", " connection " should be interpreted broadly, and connect for example, it may be fixing, it is also possible to be to removably connect, or one
Body ground connects；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to indirect by intermediary
It is connected, can be the connection of two element internals.For the ordinary skill in the art, can be with in concrete condition understanding
State term concrete meaning in the present invention.
First embodiment
Refer to Fig. 1, the present embodiment provides a kind of current mode active filter circuit 100, it include filter unit 110, across
Lead unit 120 and current lens unit 130.Input signal Iin inputs from the input of filter unit 110, filter unit 110
Outfan electrically connects with the input of described transconductance cell 120 and the input of described current lens unit 130 respectively, described across
The control end of the outfan and described current lens unit 130 of leading unit 120 electrically connects, and output signal Iout is from described current mirror list
The outfan output of unit 130.
Wherein, but input signal Iin differential signal, accordingly, when input signal Iin is differential signal, output letter
Number Iout is also differential signal.
Refer to Fig. 2, filter unit 110 includes resistance R and the first electric capacity C1, described first electric capacity C1One end ground connection, separately
One end is in parallel with one end of described resistance R, the other end of described resistance R respectively with the input of described transconductance cell 120 and
The input electrical connection of described current lens unit 130.I.e. resistance R and the first electric capacity C1Constitute a simple filter circuit,
For input signal Iin being filtered process, and form described current mode active filter circuit 100 at the first of amplitude-frequency response
Limit.
What the current mode active filter circuit 100 that the present embodiment provides did not limited to transconductance cell 120 implements form,
Transconductance cell 120 can be the active device such as operational amplifier or comparator.As a example by operational amplifier, operational amplifier
The highest input impedance and the output impedance close to zero can be had to achieve the form of voltage follow.Refer to Fig. 3, Fig. 3 show
Go out a kind of folded common source and common grid operational transconductance amplifier with operational amplifier.
Refer to Fig. 4, current lens unit 130 includes the first metal-oxide-semiconductor field effect transistor subelement, the second metal-oxide-semiconductor field effect transistor list
Unit and the second electric capacity C2.Described first metal-oxide-semiconductor field effect transistor subelement includes the first metal-oxide-semiconductor field effect transistor M2, a 2nd MOS field
Effect unit of pipe includes a second metal-oxide-semiconductor field effect transistor M3, the input of described first metal-oxide-semiconductor field effect transistor M2 and described filtering
The outfan electrical connection of unit 110, the grid of described first metal-oxide-semiconductor field effect transistor M2 and the grid of described second metal-oxide-semiconductor field effect transistor M3
Pole electrically connects, the outfan of described transconductance cell 120 and the grid of described first metal-oxide-semiconductor field effect transistor M2 and described 2nd MOS
The grid electrical connection of field effect transistor M3.Wherein, described second electric capacity C2Grid and institute for described first metal-oxide-semiconductor field effect transistor M2
The common of grid stating the second metal-oxide-semiconductor field effect transistor M3 arrives ground electric capacity.
Metal-oxide-semiconductor field effect transistor is also referred to as metal oxide semiconductor field effect tube.It typically has depletion type and enhancement mode two
Kind.Enhancement mode MOSFET can be divided into NPN type positive-negative-positive.NPN type is commonly referred to N-channel type, and positive-negative-positive is also P-channel type.Right
In the metal-oxide-semiconductor field effect transistor of N-channel, its source electrode and drain electrode are connected on N-type semiconductor, similarly for the metal-oxide-semiconductor field effect transistor of P-channel,
Its source electrode and drain electrode are then connected on P-type semiconductor.The output electric current of metal-oxide-semiconductor field effect transistor is by the Control of Voltage inputted, and can recognize
Minimum for input current or do not have input current, this makes this device have the highest input impedance, and this is also that we are referred to as simultaneously
Reason for metal-oxide-semiconductor field effect transistor.
In the present embodiment, the preferably first metal-oxide-semiconductor field effect transistor M2 and the second metal-oxide-semiconductor field effect transistor M3 is P-channel MOS field effect
Pipe, and the first metal-oxide-semiconductor field effect transistor M2 and described second metal-oxide-semiconductor field effect transistor M3's is equivalently-sized.
Current mirror is a kind of by the current copy of input branch road to output branch road, to the circuit of other subsystems offer electric current
Structure, in the present embodiment, current lens unit 130 is used for so that described current mode active filter circuit 100 is operated in current field,
Solve tradition filter circuit to need between digital to analog converter and wave filter, inserting current-voltage conversion circuit (I-V),
Current/charge-voltage convertor (V-I) is inserted so that transmitter entirety link is complicated, face between wave filter and up-conversion mixer
Long-pending increase, the problem that power consumption increases.
Additionally, described transconductance cell 120, with the second metal-oxide-semiconductor field effect transistor M3 and second electricity of described current lens unit 130
Hold C2It is collectively forming and the second limit of described first limit conjugation.Complex-conjugate poles improves outside the band of filter unit 110
Rejection ability, so that quickly roll-offing outside the band of described filter unit through the described filtered output signal of filter unit 110.
The mutual conductance assuming described first metal-oxide-semiconductor field effect transistor M2 is gm2, the mutual conductance of described transconductance cell 120 is gm1, described electricity
The gain of stream mirror unit 130 is G, and three dB bandwidth and the quality factor of described current mode active filter circuit 100 are respectively ω0With
Q, the transfer function of the most described current mode active filter circuit 100
According to above-mentioned formula, can be by the different values of above-mentioned parameter, it is achieved specific Butterworth, Chebyshev etc.
Filter function, such as, by above-mentioned R, C1、C2、gm1And gm2Reasonable value, whenTime, i.e. achieve Bart and irrigate
This filter function；WhenTime, i.e. achieve Chebyshev's filter function.Wherein, refer to Fig. 5, in Fig. 5,1 represents bar
Special Butterworth function, 2 represent chebyshev function.In the passband of Butterworth function, the amplitude of amplitude frequency curve is smooth, and in resistance
It is zero that frequency band is then gradually reduced；Chebyshev function is faster than the decay of Butterworth filter function in intermediate zone, but has in passband
Equivalent ripple.
The operation principle of current mode active filter circuit 100 is: the current mode active filter circuit 100 that the present embodiment provides
Including filter unit 110, transconductance cell 120 and current lens unit 130；The outfan of described filter unit 110 respectively with institute
State the input electrical connection of the input of transconductance cell 120 and described current lens unit 130, described transconductance cell 120 defeated
Go out end to electrically connect with the control end of described current lens unit 130.Input signal Iin is after filter unit 110 inputs, through mutual conductance
Unit 120 and current lens unit 130, current lens unit 130 makes the present invention provide current mode active filter circuit 100 to work
At current field, owing to whole current mode active filter circuit 100 existing complex-conjugate poles so that current mode active power filtering electricity
Roll-off outside the band on road 100 quickening, improve Out-of-band rejection ability, thus improve the performance of current mode active filter circuit 100.
Second embodiment
Refer to Fig. 6, embodiments provide the processing method of a kind of signal, be applied to current mode active power filtering electricity
Road, described active filter circuit includes filter unit, transconductance cell and current lens unit；The outfan of described filter unit divides
Do not electrically connect with the input of the input of described transconductance cell and described current lens unit, the outfan of described transconductance cell
Electrically connect with the control end of described current lens unit；Described method includes:
S110: described current lens unit so that described current mode active filter circuit is operated in current field.
S120: described filter unit receives current input signal.
S130: described filter unit, is filtered input signal processing, and forms described current mode active filter circuit
First limit of amplitude-frequency response.
S140: described transconductance cell, is collectively forming and the second pole of described first limit conjugation with described current lens unit
Point, so that the output signal through described filtering unit filters is quickly roll-offed outside the band of described filter unit.
In sum, embodiments provide a kind of current mode active filter circuit 100 and signal processing method,
Described current mode active filter circuit 100 includes filter unit 110, transconductance cell 120 and current lens unit 130；Described electricity
Stream mirror unit 130, is used for so that described current mode active filter circuit 100 is operated in current field；Described filter unit 110, uses
In input signal being filtered process, and form the first limit of described current mode active filter circuit 100 amplitude-frequency response；Institute
State transconductance cell 120, for being collectively forming and the second limit of described first limit conjugation with described current lens unit 130, with
Make the output signal through the filtering of described filter unit 110 quickly roll-off outside the band of described filter unit 110, improve DAC
The rejection ability of clock mirror image signal, extends the current mode filter circuit 100 range of application in the middle of various protocol systems.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, it is also possible to pass through
Other mode realizes.Device embodiment described above is only schematically, such as, and the flow chart in accompanying drawing and block diagram
Show the device of multiple embodiments according to the present invention, the architectural framework in the cards of method and computer program product,
Function and operation.In this, each square frame in flow chart or block diagram can represent a module, program segment or the one of code
Part, a part for described module, program segment or code comprises holding of one or more logic function for realizing regulation
Row instruction.It should also be noted that at some as in the implementation replaced, the function marked in square frame can also be to be different from
The order marked in accompanying drawing occurs.Such as, two continuous print square frames can essentially perform substantially in parallel, and they are the most also
Can perform in the opposite order, this is depending on involved function.It is also noted that every in block diagram and/or flow chart
The combination of the square frame in individual square frame and block diagram and/or flow chart, can be with function or the special base of action performing regulation
System in hardware realizes, or can realize with the combination of specialized hardware with computer instruction.
It addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation
Point, it is also possible to it is modules individualism, it is also possible to two or more modules are integrated to form an independent part.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a current mode active filter circuit, it is characterised in that include filter unit, transconductance cell and current lens unit；
The outfan of described filter unit input with the input of described transconductance cell and described current lens unit respectively is electrically connected
Connecing, the outfan of described transconductance cell electrically connects with the control end of described current lens unit；
Described current lens unit, is used for so that described current mode active filter circuit is operated in current field；
Described filter unit, for input signal is filtered process, and forms described current mode active filter circuit amplitude-frequency
First limit of response；
Described transconductance cell, for being collectively forming and the second limit of described first limit conjugation with described current lens unit, with
The output signal through described filtering unit filters is made quickly to roll-off outside the band of described filter unit.
Current mode active filter circuit the most according to claim 1, it is characterised in that described transconductance cell is operation amplifier
The active device such as device or comparator.
Current mode active filter circuit the most according to claim 1, it is characterised in that described filter unit includes resistance R
And the first electric capacity C1, described first electric capacity C1One end ground connection, the other end is in parallel with one end of described resistance R, described resistance R's
Other end input with the input of described transconductance cell and described current lens unit respectively electrically connects.
Current mode active filter circuit the most according to claim 1, it is characterised in that described current lens unit includes first
Metal-oxide-semiconductor field effect transistor subelement, the second metal-oxide-semiconductor field effect transistor subelement and the second electric capacity C2, described first metal-oxide-semiconductor field effect transistor list
Unit includes that a metal-oxide-semiconductor field effect transistor, described second metal-oxide-semiconductor field effect transistor subelement include a metal-oxide-semiconductor field effect transistor.
Current mode active filter circuit the most according to claim 4, it is characterised in that described first metal-oxide-semiconductor field effect transistor
Unit includes that the first metal-oxide-semiconductor field effect transistor M2, the second metal-oxide-semiconductor field effect transistor subelement include the second metal-oxide-semiconductor field effect transistor M3, described first
The input of metal-oxide-semiconductor field effect transistor M2 electrically connects with the outfan of described filter unit, the grid of described first metal-oxide-semiconductor field effect transistor M2
Electrically connect with the grid of described second metal-oxide-semiconductor field effect transistor M3, the outfan of described transconductance cell and described first metal-oxide-semiconductor field effect transistor
The grid of M2 and the grid electrical connection of described second metal-oxide-semiconductor field effect transistor M3, described second electric capacity C2For a described MOS field effect
Should grid common to ground electric capacity of the grid of pipe M2 and described second metal-oxide-semiconductor field effect transistor M3.
Current mode active filter circuit the most according to claim 5, it is characterised in that described first metal-oxide-semiconductor field effect transistor M2
Mutual conductance be gm2, the mutual conductance of described transconductance cell is gm1, the gain of described mirror image unit is G, described current mode active power filtering electricity
Three dB bandwidth and the quality factor on road are respectively ω0And Q, the transfer function of described current mode active filter circuit
Current mode active filter circuit the most according to claim 5, it is characterised in that described first metal-oxide-semiconductor field effect transistor M2
It is P-channel metal-oxide-semiconductor field effect transistor with described second metal-oxide-semiconductor field effect transistor M3.
Current mode active filter circuit the most according to claim 7, it is characterised in that described first metal-oxide-semiconductor field effect transistor M2
Equivalently-sized with described second metal-oxide-semiconductor field effect transistor M3.
Current mode active filter circuit the most according to claim 1, it is characterised in that described input signal is difference letter
Number.
10. a processing method for signal, is applied to current mode active filter circuit, it is characterised in that described active power filtering electricity
Road includes filter unit, transconductance cell and current lens unit；The outfan of described filter unit respectively with described transconductance cell
Input and the input electrical connection of described current lens unit, the outfan of described transconductance cell and described current lens unit
Control end electrical connection；Described method includes:
Described current lens unit so that described current mode active filter circuit is operated in current field；
Described filter unit receives current input signal；
Described filter unit, is filtered input signal processing, and forms described current mode active filter circuit amplitude-frequency response
The first limit；
Described transconductance cell, is collectively forming and the second limit of described first limit conjugation with described current lens unit, so that warp
The output signal crossing described filtering unit filters is quickly roll-offed outside the band of described filter unit.
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| CN201610671848.6A CN106209021B (en) | 2016-08-16 | 2016-08-16 | Current mode active filter circuit and signal processing method |
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| CN201610671848.6A CN106209021B (en) | 2016-08-16 | 2016-08-16 | Current mode active filter circuit and signal processing method |
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| US20160048152A1 (en) * | 2014-08-14 | 2016-02-18 | Texas Instruments Incorporated | Current mirror with depletion mode mos and embedded noise filter |
| CN205883179U (en) * | 2016-08-16 | 2017-01-11 | 深圳市蓝狮微电子有限公司 | Current mode active power filter circuit |
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| US4404529A (en) * | 1980-12-30 | 1983-09-13 | Rossum David P | Lowpass filter with electronic control of cutoff and resonance |
| JPH09167941A (en) * | 1995-12-15 | 1997-06-24 | Sanyo Electric Co Ltd | Low pass filter |
| CN102571018A (en) * | 2010-12-28 | 2012-07-11 | 杭州中科微电子有限公司 | Automatic frequency tuning circuit of on-chip filter |
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|---|---|
| CN106209021B (en) | 2018-12-04 |
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Effective date of registration: 20191219 Address after: 315499 Zhejiang province Ningbo city Yuyao Economic Development Zone Chengdong new district smelter mountain road Patentee after: Co semiconductor (Ningbo) Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili street Shigu road morning business center B block 508 Patentee before: Shenzhen Blue Lion Microelectronics Co., Ltd. |