CN102638240A - Double-mode type active power filter circuit with adjustable bandwidth - Google Patents
Double-mode type active power filter circuit with adjustable bandwidth Download PDFInfo
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Abstract
The invention provides a double-mode type active power filter circuit with an adjustable bandwidth. The filter circuit can be configured to be at two modes of a complex band-pass filter and a low-pass filter which are respectively used for a receiving chain and an emitting chain in a wireless receiver chip. The filter circuit comprises a first third-order low-pass filter, a second third-order low-pass filter, a multi-resistance network, a first extra input end, a second extra input end, a first first-order passive RC (Remote Control) filter and a second first-order passive RC filter. The filter circuit has the advantages that the double-mode type active power filter circuit can be controlled through an internal switch and can be configured to be at the two work modes, so that the area of the chip is saved and the cost of a system is reduced.
Description
Technical field
The present invention relates to the adjustable double mode active filter circuit of a kind of bandwidth, belong to the analog integrated circuit technical field.
Background technology
Adopt technology that CMOS technology realizes short-distance wireless transceiving chip comparative maturity at present, the short-distance wireless transceiving chip has been widely used in wireless mouse, wireless remote control, wireless data sending and other Radio Network Systems.On market, many moneys product has appearred, and the competition of radio transmitting and receiving chip is growing more intense.How to reduce chip area, save cost, become the focus of short-distance wireless transceiving chip design.
The short-distance wireless transceiving chip is divided into and receives link and transmitting chain, and its working method is a semiduplex mode, and promptly this chip can only receive signal at synchronization and maybe can only transmit.This semiduplex mode of operation makes the designer when designed reception link and transmitting chain, can be through shared common unit to reach the purpose that reduces chip cost.
In the design that receives link, system configuration has super-heterodyne architecture, zero-if architecture and Low Medium Frequency structure, because the Low Medium Frequency structure has been taken into account the advantage of super-heterodyne architecture and zero-if architecture, has therefore obtained using widely.In the low intermediate frequency receiver structure, useful signal and image signal pass through the quadrature mixing respectively, downconvert to lower intermediate frequency, and useful signal and image signal lay respectively at positive frequency place and negative frequency place.Utilize one to align negative frequency components amplitude-frequency response different filter,, amplify useful signal and filtering mirror image and disturb like complex filter.Low intermediate frequency receiver suppresses problem with mirror image and transfers to lower intermediate frequency by radio frequency, makes integrated level improve.Signal after the down-conversion is not positioned at base band simultaneously, has avoided the problem of DC maladjustment.Low intermediate frequency receiver has solved the main difficult point in superheterodyne receiver and the zero intermediate frequency reciver, thereby has obtained using more widely.
In the design of transmitting chain; System configuration is at present most widely used to be exactly direct up-conversion structure; Digital baseband signal at first converts analog signal into by D/A converting circuit (DAC), passes through interference signals such as low pass filter filters out clock again, enters into up-conversion mixer then; Be modulated on the output frequency, launch via power amplifier at last.
In receiving link and transmitting chain, all have an intermediate-frequency filter separately, because operating frequency is low, these two filter circuits can take more chip area.In receiving link; Need the image signal in the complex filter filtering two-way orthogonal signalling; In transmitting chain, need crosstalking of clock signal in the low pass filter filters out DAC output analog signal, system is less demanding to the frequency characteristic of this filter.Transmitting chain with receive link in the bandwidth of operation of system be the same, promptly two filters have same band.Can above-mentioned two filters be merged into a filter in conjunction with above-mentioned 2,, save cost to reduce chip area.
In the short-distance wireless receive-transmit system; System has relatively high expectations to the linearity of active filter, and is operated in the active filter in a few MHz frequency ranges, adopts active RC filter structures to realize usually; Can satisfy the requirement of the linearity, also can satisfy the requirement of operating frequency.
Summary of the invention
The purpose of this invention is to provide the adjustable double mode active filter circuit of a kind of bandwidth, this circuit application is in the short-distance wireless receive-transmit system, thereby the saving chip area reduces chip cost.
According to technical scheme provided by the invention, the double mode active filter circuit that said bandwidth is adjustable is configurable to be complex bandpass filters and two kinds of patterns of low pass filter, be respectively applied in the reception link in the wireless transceiver chip with transmitting chain in.The double mode active filter circuit that this bandwidth is adjustable comprises: first third-order low-pass filter, second third-order low-pass filter, many resistor networks, the first extra input, the second extra input, the first single order passive RC filter, the second single order passive RC filter; Said first third-order low-pass filter; Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the in-phase end signal of two-way orthogonal signalling, simultaneously by signal of its output output, as the in-phase output end signal of complex filter; Said second third-order low-pass filter; Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the quadrature end signal of two-way orthogonal signalling, simultaneously by signal of its output output, as the quadrature output end signal of complex filter; Said many resistor networks are connected between first third-order low-pass filter and second third-order low-pass filter, and first third-order low-pass filter and second third-order low-pass filter are connected and composed a complex filter; The said first extra input is connected with many resistor networks with first third-order low-pass filter; When double mode active filter circuit was configured to low pass filter, the said first extra input was used for receiving inputted signal, input signal was delivered in first third-order low-pass filter, simultaneously the isolation between realization and the complex filter in-phase input end; The said second extra input is connected with many resistor networks with second third-order low-pass filter; When double mode active filter circuit was configured to low pass filter, the said second extra input was used for receiving inputted signal, input signal was delivered in second third-order low-pass filter, simultaneously the isolation between realization and the complex filter orthogonal input; The said first single order passive RC filter is connected with the output of first third-order low-pass filter; When double mode active filter circuit is configured to low pass filter, the output that the said first single order passive RC filter is used to export first third-order low-pass filter, the isolation between realization and the complex filter in-phase output end simultaneously; The said second single order passive RC filter is connected with the output of second third-order low-pass filter; When double mode active filter circuit is configured to low pass filter, the output that the said second single order passive RC filter is used to export second third-order low-pass filter, the isolation between realization and the complex filter quadrature output simultaneously.
Said second third-order low-pass filter and first third-order low-pass filter are identical structures.
When double mode active filter circuit is configured to the low pass filter pattern; Said first third-order low-pass filter itself is worked alone as the low-pass filter circuit of a real signal; This moment, the input of first third-order low-pass filter turn-offed, and input signal is imported by the first extra input; Said first third-order low-pass filter is formed by three low-pass first order filter cascades, and the gain of first order low pass filter is A, and the second level and the gain of third level low pass filter are 1; A is the ratio of feedback resistance and input resistance in the first order low-pass first order filter, and gain A is used to reduce the influence of circuit noise to input signal; Resistance in each low-pass first order filter and electric capacity all are adjustable, and the adjusting of resistance is used to realize the selection of different bandwidth pattern, and the adjusting of electric capacity is used to remedy the deviation of the filter operating frequency that factors such as technology and temperature cause; The input of said first third-order low-pass filter is connected with switch.
The inner resistance of said many resistor networks is controlled by corresponding switch respectively; All switches receive same signal controlling; When switch conduction; Double mode active filter circuit is configured to the complex filter pattern, and when switch turn-offed, double mode active filter circuit was configured to two low pass filter patterns; The switch of controlling each resistance is connected to the output of first third-order low-pass filter and inner each low-pass first order filter of second third-order low-pass filter, makes circuit structure symmetrical.
The said first extra input comprises the resistance of two switch controls, when switch conduction, and the first extra input work, input signal at first passes through resistance through switch again, enters into first third-order low-pass filter then; When switch turn-offed, the first extra input quit work; When input signal during from the input of the first extra input, the gain of double mode active filter circuit is 1, and promptly the inner first order firstorder filter of first third-order low-pass filter no longer provides gain A.
The said second extra input comprises the resistance of two switch controls, when switch conduction, and the second extra input work, input signal at first passes through resistance through switch again, enters into second third-order low-pass filter then; When switch turn-offed, the second extra input quit work; When input signal during from the input of the second extra input, the gain of double mode active filter circuit is 1, and promptly the inner first order firstorder filter of second third-order low-pass filter no longer provides gain A.
The said first single order passive RC filter comprises the resistance, switch and the electric capacity that connect successively to ground, and the output signal of the one or three rank filter passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the first single order passive RC filter is as output work, and when switch turn-offed, the first single order passive RC filter quit work.
The said second single order passive RC filter comprises the resistance, switch and the electric capacity that connect successively to ground, and the output signal of the two or three rank filter passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the second single order passive RC filter is as output work, and when switch turn-offed, the second single order passive RC filter quit work.
The said first third-order low-pass filter switch inside, the second third-order low-pass filter switch inside and many resistor networks switch inside are controlled by the first signal S1 jointly; The first extra input switch inside, the second extra input switch inside, the first single order passive RC filter switch inside and the second single order passive RC filter switch inside are controlled by secondary signal S2 jointly; S1 and S2 be conducting simultaneously not; When S1 controls corresponding switch conduction, S2 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the complex filter pattern; When S2 controls corresponding switch conduction, S1 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the low pass filter pattern.
Advantage of the present invention is:
1, the present invention is based on the basis of traditional active RC complex filter, has adopted the switching of digital switch control active filter between complex filter and two kinds of mode of operations of low pass filter, has realized two kinds of mode of operations.
2, two input stages and two output stages are arranged in the circuit of the present invention, respectively with switch control, thereby realized the isolation between two kinds of mode of operations, unaffected each other.
3, the extra output stage in the circuit of the present invention adopts the passive RC low pass filter of a single order, has both realized isolation, does not consume big power consumption and area again.
4, in the circuit of the present invention, adopt the digital switch technology to realize complex filter and two kinds of mode of operations of low pass filter, realized the shared of circuit, thereby saved chip area, saved cost.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the circuit structure diagram of adjustable resistance icon among Fig. 1.
Fig. 3 is the circuit structure diagram of tunable capacitor icon among Fig. 1.
Fig. 4 is the circuit structure diagram of switch icon among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
The adjustable double mode active filter circuit of bandwidth that the present invention proposes, as shown in Figure 1.This circuit is based on traditional low-pass first order filter structure; Form the third-order low-pass filter circuit through three-stage cascade; Two third-order low-pass filters connect through too much resistor network, have just formed a complex filter circuit, and promptly complex filter is made up of two low pass filters and many resistor networks; Conducting and shutoff when the many resistor networks of control have just realized the switching between complex filter and the low-pass filter circuit.
In the short-distance wireless transceiving chip, complex filter is used in and receives in the link, realizes the inhibition to image signal, and low pass filter is used in the transmitting chain, realizes the inhibition to the clock interference signal.In transmitting chain, only need a low-pass filter circuit, two low-pass filter circuits are arranged in this active filter circuit, when emission state, another low pass filter is not worked, to save power consumption.
The double mode active filter circuit concrete structure that said bandwidth is adjustable comprises: the extra input of the extra input of first third-order low-pass filter 26, second third-order low-pass filter 27, many resistor networks 23, first 21, second 22, the first single order passive RC filter 24, the second single order passive RC filter 25; Said first third-order low-pass filter 26; Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the in-phase end signal of two-way orthogonal signalling, simultaneously by signal of its output output, as the in-phase output end signal of complex filter; Said second third-order low-pass filter 27; Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the quadrature end signal of two-way orthogonal signalling, simultaneously by signal of its output output, as the quadrature output end signal of complex filter; Said many resistor networks 23 are connected between first third-order low-pass filter 26 and second third-order low-pass filter 27, and first third-order low-pass filter 26 and second third-order low-pass filter 27 are connected and composed a complex filter; The said first extra input 21 is connected with many resistor networks 23 with first third-order low-pass filter 26; When double mode active filter circuit was configured to low pass filter, the said first extra input 21 was used for receiving inputted signal, input signal was delivered in first third-order low-pass filter 26, simultaneously the isolation between realization and the complex filter in-phase input end; The said second extra input 22 is connected with many resistor networks 23 with second third-order low-pass filter 27; When double mode active filter circuit was configured to low pass filter, the said second extra input 22 was used for receiving inputted signal, input signal was delivered in second third-order low-pass filter 27, simultaneously the isolation between realization and the complex filter orthogonal input; The said first single order passive RC filter 24 is connected with the output of first third-order low-pass filter 26; When double mode active filter circuit is configured to low pass filter, the output that the said first single order passive RC filter 24 is used to export first third-order low-pass filter 26, the isolation between realization and the complex filter in-phase output end simultaneously; The said second single order passive RC filter 25 is connected with the output of second third-order low-pass filter 27; When double mode active filter circuit is configured to low pass filter, the output that the said second single order passive RC filter 25 is used to export second third-order low-pass filter 27, realization and complex filter are failed and are just being surrendered the isolation between the end simultaneously.
When double mode active filter circuit is configured to the low pass filter pattern; Said first third-order low-pass filter 26 itself is worked alone as the low-pass filter circuit of a real signal; This moment, the input of first third-order low-pass filter 26 turn-offed, and input signal is imported by the first extra input 21.Said first third-order low-pass filter 26 is formed by three low-pass first order filter cascades, and the gain of first order low pass filter is A, and the second level and the gain of third level low pass filter are 1; The ratio of feedback resistance and input resistance is A in first low-pass first order filter through adjusting, and the gain that can realize first order low pass filter is A, and A is usually greater than 1, and this gain is used to reduce the influence of circuit noise to input signal; Resistance in each low-pass first order filter and electric capacity all are adjustable, and the adjusting of resistance is used to realize the selection of different bandwidth pattern, and the adjusting of electric capacity is used to remedy the deviation of the filter operating frequency that factors such as technology and temperature cause; The input of said first third-order low-pass filter 26 is connected with switch.Second third-order low-pass filter 27 and first third-order low-pass filter 26 are identical structures.
Said many resistor networks 23 inner resistance are controlled by corresponding switch respectively; All switches receive same signal controlling; When switch conduction; Double mode active filter circuit is configured to the complex filter pattern, and when switch turn-offed, double mode active filter circuit was configured to two low pass filter patterns; The switch of controlling each resistance is connected to the output of first third-order low-pass filter 26 and second third-order low-pass filter, 27 inner each low-pass first order filter, makes circuit structure symmetrical.
The said first extra input 21 comprises the resistance of two switch controls, when switch conduction, and first extra input 21 work, input signal at first passes through resistance through switch again, enters into first third-order low-pass filter 26 then; When switch turn-offed, the first extra input 21 quit work; When input signal during from 21 inputs of the first extra input, the gain of double mode active filter circuit is 1, and promptly first third-order low-pass filter, 26 inner first order firstorder filters no longer provide gain A.
The said second extra input 22 comprises the resistance of two switch controls, when switch conduction, and second extra input 22 work, input signal at first passes through resistance through switch again, enters into second third-order low-pass filter 27 then; When switch turn-offed, the second extra input 22 quit work; When input signal during from 22 inputs of the second extra input, the gain of double mode active filter circuit is 1, and promptly second third-order low-pass filter, 27 inner first order firstorder filters no longer provide gain A.
The said first single order passive RC filter 24 comprises the resistance, switch and the electric capacity that connect successively to ground, and the output signal of the one or three rank filter 26 passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the first single order passive RC filter 24 is as output work, and when switch turn-offed, the first single order passive RC filter 24 quit work.
The said second single order passive RC filter 25 comprises the resistance, switch and the electric capacity that connect successively to ground, and the output signal of the two or three rank filter 27 passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the second single order passive RC filter 25 is as output work, and when switch turn-offed, the second single order passive RC filter 25 quit work.
Said first third-order low-pass filter, 26 switch inside, second third-order low-pass filter, 27 switch inside and many resistor networks 23 switch inside are controlled by the first signal S1 jointly; First extra input 21 switch inside, second extra input 22 switch inside, the first single order passive RC filter, 24 switch inside and the second single order passive RC filter, 25 switch inside are controlled by secondary signal S2 jointly; S1 and S2 be conducting simultaneously not; When S1 controls corresponding switch conduction, S2 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the complex filter pattern; When S2 controls corresponding switch conduction, S1 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the low pass filter pattern.
In Fig. 1, input VIIP, VIIN and VQIP, VQIN are respectively two groups of inputs of complex filter, receive the two-way positive blending output signal of front stage circuits output.VIIP wherein, VIIN receives the in-phase input end signal, VQIP, VQIN receives the orthogonal input signal.Output VION, VIOP and VQON, VQOP are respectively two groups of outputs of complex filter, are respectively in-phase output end and quadrature output.When filter of the present invention was operated in the complex filter pattern, signal was exactly to get into from above-mentioned input, output output.
In Fig. 1, input port VTIP, VTIN are the input of low pass filter, the input of corresponding system works signal when emission state, and output port VTOP, VTON are the output of low pass filter.Transmitting chain only needs a low-pass filter circuit, and signal is through above-mentioned input port VTIP at this moment, and VTIN enters into third-order low-pass filter circuit 26, and from output port VTOP, VTON output.
The input port VTIP of first third-order low-pass filter 26, the input port VIIP of VTIN and complex filter, VIIN contain pair of switches separately, in order to realize two isolation between the port.The output port VTOP of low pass filter, the output port VION of VTON and complex filter, VIOP isolates through first a single order passive RC filter 24 that has switch.When being operated in the low pass filter pattern, the 24 switch inside conductings of the first single order passive RC filter, when being operated in the complex filter pattern, the first single order passive RC filter, 24 switch inside are turn-offed.
Under the mode of operation of low pass filter, because transmitting chain only needs a third-order low-pass filter circuit, therefore; Second third-order low-pass filter 27 is in idle state; But be the symmetry of holding circuit structure, guarantee the performance of complex filter, second third-order low-pass filter 27 is also the same with first third-order low-pass filter 26; One second extra input 22 and output have been added respectively, i.e. the second single order passive RC filter 25.Owing to do not have the input of signal, so the input of this second third-order low-pass filter 27 and output termination reference potential VCM.Usually VCM is exactly an earth potential.
The structure of all adjustable resistances is all as shown in Figure 2 among Fig. 1, and first resistance R 1, second resistance R 2, the 3rd resistance R 3 are connected switch of parallel connection on the 3rd resistance R 3, parallelly connected again switch on the tandem compound of second resistance R 2 and the 3rd resistance R 3 successively.Resistance has three kinds of optional values among the design, corresponding three kinds of bandwidth preference patterns.When changing resistance R BW1, RBW2 is during RBW3; Bandwidth is promptly adjusted accordingly; And the centre frequency of complex filter can be affected when bandwidth changes, thus the resistance R FC1 in many resistor networks, RFC2; RFC3 also will adjust accordingly, so that the centre frequency of complex filter is constant.
The structure of all tunable capacitors is all as shown in Figure 3 among Fig. 1, and tunable capacitor shown in Figure 3 realizes that through a capacitor array it is made up of the sub-electric capacity of 6 parallel connections, and each sub-electric capacity is all controlled by switch separately.The value of 6 sub-electric capacity is respectively △ C, 2 △ C, 4 △ C, 8 △ C, 16 △ C and C.Wherein C is the fixing electric capacity of conducting, and it is controlled by switch Tclosed, and this switch is in the state of normal conducting.Capacitance is that the electric capacity of △ C is controlled by switch T0; Capacitance is that the electric capacity of 2 △ C is controlled by switch T1; Capacitance is that the electric capacity of 4 △ C is controlled by switch T2, and capacitance is that the electric capacity of 8 △ C is controlled by switch T3, and capacitance is that the electric capacity of 16 △ C is controlled by switch T4; Its control signal is from automatic frequency tuning circuit on the sheet (this circuit is provided by system), and the purpose of control capacittance is the deviation that compensate for process and temperature etc. are introduced the filter operating frequency.
In many resistor networks 23; Each resistance all has switch its conducting of control and shutoff; One end of each switch connects an end of resistance; The other end is connected to the output of first third-order low-pass filter 26 and second third-order low-pass filter, 27 inner each low-pass first order filter, makes circuit structure symmetrical.The structure of many resistor networks 23 is symmetrical, and the ghost effect of its introducing also is symmetrical to two filter circuits, makes the best performance of filter.
Control complex filter input VIIP; VIIN and VQIP; The switch of VQIN and many resistor networks 23 switch inside are with the control that receives the first signal S1, and two extra input 21,22 switch inside and two single order passive RC filter 24,25 switch inside are with controlled by secondary signal S2.When S1 controls corresponding switch conduction, S2 controls corresponding switch and turn-offs, and this moment, filter was operated under the pattern of complex filter; When S2 controls corresponding switch conduction, S1 controls corresponding switch and turn-offs, and this moment, filter was operated under the pattern of low pass filter.
Switches all among Fig. 1 all adopt structure shown in Figure 4, i.e. the structure of transmission gate.Transmission gate is made up of a NMOS pipe and a PMOS pipe in CMOS technology.The drain terminal of NMOS pipe connects the source end of PMOS pipe, as the input of transmission gate; The source end of NMOS pipe connects the drain terminal of PMOS pipe, as the output of transmission gate; The grid end connection control signal S of NMOS pipe, simultaneously, control signal S is also connected to an inverter; The output signal of inverter is connected to the grid end of PMOS pipe, when control signal S is high level, and the transmission gate conducting; Input signal can pass through; When control signal S was low level, transmission gate turn-offed, and input signal can not pass through.
Claims (9)
1. the double mode active filter circuit that bandwidth is adjustable is characterized in that: comprise first third-order low-pass filter (26), second third-order low-pass filter (27), many resistor networks (23), the first extra input (21), the second extra input (22), the first single order passive RC filter (24), the second single order passive RC filter (25);
Said first third-order low-pass filter (26); Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the in-phase end signal of two-way orthogonal signalling, export a signal simultaneously, as the in-phase output end signal of complex filter;
Said second third-order low-pass filter (27); Itself can work alone as the low-pass filter circuit of a real signal; When constituting complex filter circuit a part of; Be used for receiving the quadrature end signal of two-way orthogonal signalling, export a signal simultaneously, as the quadrature output end signal of complex filter;
Said many resistor networks (23) are connected between first third-order low-pass filter (26) and second third-order low-pass filter (27), and first third-order low-pass filter (26) and second third-order low-pass filter (27) are connected and composed a complex filter;
The said first extra input (21) is connected with many resistor networks (23) with first third-order low-pass filter (26); When double mode active filter circuit is configured to low pass filter; The said first extra input (21) is used for receiving inputted signal; Input signal is delivered in first third-order low-pass filter (26), simultaneously the isolation between realization and the complex filter in-phase input end;
The said second extra input (22) is connected with many resistor networks (23) with second third-order low-pass filter (27); When double mode active filter circuit is configured to low pass filter; The said second extra input (22) is used for receiving inputted signal; Input signal is delivered in second third-order low-pass filter (27), simultaneously the isolation between realization and the complex filter orthogonal input;
The said first single order passive RC filter (24) is connected with the output of first third-order low-pass filter (26); When double mode active filter circuit was configured to low pass filter, the said first single order passive RC filter (24) was used to export the output of first third-order low-pass filter (26), simultaneously the isolation between realization and the complex filter in-phase output end;
The said second single order passive RC filter (25) is connected with the output of second third-order low-pass filter (27); When double mode active filter circuit was configured to low pass filter, the said second single order passive RC filter (25) was used to export the output of second third-order low-pass filter (27), simultaneously the isolation between realization and the complex filter quadrature output.
2. the double mode active filter circuit that bandwidth as claimed in claim 1 is adjustable is characterized in that, said second third-order low-pass filter (27) is identical structure with first third-order low-pass filter (26).
3. the double mode active filter circuit that bandwidth as claimed in claim 2 is adjustable; It is characterized in that; When double mode active filter circuit is configured to the low pass filter pattern; Said first third-order low-pass filter (26) itself is worked alone as the low-pass filter circuit of a real signal, and the input of first third-order low-pass filter this moment (26) turn-offs, and input signal is imported by the first extra input (21);
Said first third-order low-pass filter (26) is formed by three low-pass first order filter cascades, and the gain of first order low pass filter is A, and the second level and the gain of third level low pass filter are 1; A is the ratio of feedback resistance and input resistance in the first order low-pass first order filter, and gain A is used to reduce the influence of circuit noise to input signal; Resistance in each low-pass first order filter and electric capacity all are adjustable, and the adjusting of resistance is used to realize the selection of different bandwidth pattern, and the adjusting of electric capacity is used to remedy the deviation of the filter operating frequency that factors such as technology and temperature cause; The input of said first third-order low-pass filter (26) is connected with switch.
4. the double mode active filter circuit that bandwidth as claimed in claim 3 is adjustable; It is characterized in that the inner resistance of said many resistor networks (23) is controlled by corresponding switch respectively, all switches receive same signal controlling; When switch conduction; Double mode active filter circuit is configured to the complex filter pattern, and when switch turn-offed, double mode active filter circuit was configured to two low pass filter patterns; The switch of controlling each resistance is connected to the output of first third-order low-pass filter (26) and inner each low-pass first order filter of second third-order low-pass filter (27), makes circuit structure symmetrical.
5. the double mode active filter circuit that bandwidth as claimed in claim 3 is adjustable; It is characterized in that; The said first extra input (21) comprises the resistance of two switch controls, when switch conduction, and the work of the first extra input (21); Input signal at first passes through resistance through switch again, enters into first third-order low-pass filter (26) then; When switch turn-offed, the first extra input (21) quit work; When input signal when the first extra input (21) is imported, the gain of double mode active filter circuit is 1, promptly the inner first order firstorder filter of first third-order low-pass filter (26) no longer provides gain A.
6. the double mode active filter circuit that bandwidth as claimed in claim 3 is adjustable; It is characterized in that; The said second extra input (22) comprises the resistance of two switch controls, when switch conduction, and the work of the second extra input (22); Input signal at first passes through resistance through switch again, enters into second third-order low-pass filter (27) then; When switch turn-offed, the second extra input (22) quit work; When input signal when the second extra input (22) is imported, the gain of double mode active filter circuit is 1, promptly the inner first order firstorder filter of second third-order low-pass filter (27) no longer provides gain A.
7. the double mode active filter circuit that bandwidth as claimed in claim 1 is adjustable; It is characterized in that; The said first single order passive RC filter (24) comprises that the resistance, switch and the electric capacity that connect successively are to ground; The output signal of the one or three rank filter (26) passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the first single order passive RC filter (24) is as output work, and when switch turn-offed, the first single order passive RC filter (24) quit work.
8. the double mode active filter circuit that bandwidth as claimed in claim 1 is adjustable; It is characterized in that; The said second single order passive RC filter (25) comprises that the resistance, switch and the electric capacity that connect successively are to ground; The output signal of the two or three rank filter (27) passes through switch again through resistance, is exported after the filtering over the ground by electric capacity then; When switch conduction, the second single order passive RC filter (25) is as output work, and when switch turn-offed, the second single order passive RC filter (25) quit work.
9. the double mode active filter circuit that bandwidth as claimed in claim 1 is adjustable; It is characterized in that; Said first third-order low-pass filter (26) switch inside, second third-order low-pass filter (27) switch inside and many resistor networks (23) switch inside are controlled by the first signal S1 jointly; First extra input (21) switch inside, second extra input (22) switch inside, first single order passive RC filter (24) switch inside and second single order passive RC filter (25) switch inside are controlled by secondary signal S2 jointly; S1 and S2 be conducting simultaneously not; When S1 controls corresponding switch conduction, S2 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the complex filter pattern; When S2 controls corresponding switch conduction, S1 controls corresponding switch and turn-offs, and double mode active filter circuit is operated in the low pass filter pattern.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123385.1A CN102638240B (en) | 2012-04-24 | 2012-04-24 | Double-mode type active power filter circuit with adjustable bandwidth |
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| CN103151996A (en) * | 2013-03-01 | 2013-06-12 | 东南大学 | Reconfigurable filter |
| CN103227620A (en) * | 2013-05-09 | 2013-07-31 | 重庆西南集成电路设计有限责任公司 | Reconfigurable Gm_C filter circuit |
| CN103326694A (en) * | 2013-05-23 | 2013-09-25 | 江苏天源电子有限公司 | Novel calibration complex filter |
| CN103326693A (en) * | 2013-05-09 | 2013-09-25 | 重庆西南集成电路设计有限责任公司 | Reconfigurable Gm-C filter circuit |
| CN103715876A (en) * | 2013-12-23 | 2014-04-09 | 延锋伟世通电子科技（上海）有限公司 | Low-voltage drop active power filter |
| WO2014075215A1 (en) * | 2012-11-13 | 2014-05-22 | 海能达通信股份有限公司 | Active power filter, duplexer and wireless communication device |
| CN103956989A (en) * | 2014-05-23 | 2014-07-30 | 武汉大学 | Multimode multiband reconfigurable Gm-C complex filter |
| CN104967425A (en) * | 2015-07-21 | 2015-10-07 | 海宁市丰达电子有限公司 | Bipolar low-pass filter |
| CN106330131A (en) * | 2015-06-30 | 2017-01-11 | 大唐半导体设计有限公司 | Zero frequency high-suppression complex filter device |
| CN106953614A (en) * | 2017-03-01 | 2017-07-14 | 贵州木弓贵芯微电子有限公司 | A kind of controllable complex filter of intermediate frequency and complex filter intermediate frequency control method |
| CN107819451A (en) * | 2017-10-26 | 2018-03-20 | 山东大学 | A kind of active RC complex bandpass filter |
| CN107888224A (en) * | 2017-12-18 | 2018-04-06 | 南京中感微电子有限公司 | A kind of radio transceiver machine |
| CN109714022A (en) * | 2018-12-13 | 2019-05-03 | 航天恒星科技有限公司 | A kind of filter that multidimensional is restructural |
| CN109728793A (en) * | 2019-02-28 | 2019-05-07 | 南开大学 | A kind of multi-pass band complex filter circuit |
| CN113644932A (en) * | 2021-08-17 | 2021-11-12 | 江苏星宇芯联电子科技有限公司 | Big dipper No. three RDSS system transmission link filter bandwidth automatic switching circuit |
| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
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| WO2014075215A1 (en) * | 2012-11-13 | 2014-05-22 | 海能达通信股份有限公司 | Active power filter, duplexer and wireless communication device |
| CN103151996A (en) * | 2013-03-01 | 2013-06-12 | 东南大学 | Reconfigurable filter |
| CN103151996B (en) * | 2013-03-01 | 2016-03-16 | 东南大学 | A kind of reconfigurable filter |
| CN103326693A (en) * | 2013-05-09 | 2013-09-25 | 重庆西南集成电路设计有限责任公司 | Reconfigurable Gm-C filter circuit |
| CN103227620B (en) * | 2013-05-09 | 2016-06-22 | 重庆西南集成电路设计有限责任公司 | reconfigurable Gm-C filter circuit |
| CN103227620A (en) * | 2013-05-09 | 2013-07-31 | 重庆西南集成电路设计有限责任公司 | Reconfigurable Gm_C filter circuit |
| CN103326694B (en) * | 2013-05-23 | 2015-08-26 | 江苏博纳雨田通信电子有限公司 | Calibration complex filter |
| CN103326694A (en) * | 2013-05-23 | 2013-09-25 | 江苏天源电子有限公司 | Novel calibration complex filter |
| CN103715876A (en) * | 2013-12-23 | 2014-04-09 | 延锋伟世通电子科技（上海）有限公司 | Low-voltage drop active power filter |
| CN103715876B (en) * | 2013-12-23 | 2018-03-13 | 延锋伟世通电子科技（上海）有限公司 | Low-voltage drop active power filter |
| CN103956989A (en) * | 2014-05-23 | 2014-07-30 | 武汉大学 | Multimode multiband reconfigurable Gm-C complex filter |
| CN103956989B (en) * | 2014-05-23 | 2018-01-26 | 武汉大学 | A kind of multimode multi-frequency restructural Gm C complex filters |
| CN106330131B (en) * | 2015-06-30 | 2019-06-07 | 大唐半导体科技有限公司 | A kind of complex filter device that zero-frequency height inhibits |
| CN106330131A (en) * | 2015-06-30 | 2017-01-11 | 大唐半导体设计有限公司 | Zero frequency high-suppression complex filter device |
| CN104967425A (en) * | 2015-07-21 | 2015-10-07 | 海宁市丰达电子有限公司 | Bipolar low-pass filter |
| CN106953614A (en) * | 2017-03-01 | 2017-07-14 | 贵州木弓贵芯微电子有限公司 | A kind of controllable complex filter of intermediate frequency and complex filter intermediate frequency control method |
| CN106953614B (en) * | 2017-03-01 | 2021-04-23 | 贵州木弓贵芯微电子有限公司 | Complex filter with controllable intermediate frequency and intermediate frequency control method of complex filter |
| CN107819451A (en) * | 2017-10-26 | 2018-03-20 | 山东大学 | A kind of active RC complex bandpass filter |
| CN107819451B (en) * | 2017-10-26 | 2022-07-05 | 山东大学 | Active RC complex band-pass filter |
| CN107888224A (en) * | 2017-12-18 | 2018-04-06 | 南京中感微电子有限公司 | A kind of radio transceiver machine |
| CN109714022A (en) * | 2018-12-13 | 2019-05-03 | 航天恒星科技有限公司 | A kind of filter that multidimensional is restructural |
| CN109728793A (en) * | 2019-02-28 | 2019-05-07 | 南开大学 | A kind of multi-pass band complex filter circuit |
| CN113644932A (en) * | 2021-08-17 | 2021-11-12 | 江苏星宇芯联电子科技有限公司 | Big dipper No. three RDSS system transmission link filter bandwidth automatic switching circuit |
| CN116683882A (en) * | 2023-06-06 | 2023-09-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
| CN116683882B (en) * | 2023-06-06 | 2023-12-01 | 上海韬润半导体有限公司 | N-phase input configurable passive filter system and implementation method |
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