CN109889183A - A kind of low-power consumption province area active RC complex filter - Google Patents
A kind of low-power consumption province area active RC complex filter Download PDFInfo
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- CN109889183A CN109889183A CN201910102494.7A CN201910102494A CN109889183A CN 109889183 A CN109889183 A CN 109889183A CN 201910102494 A CN201910102494 A CN 201910102494A CN 109889183 A CN109889183 A CN 109889183A
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Abstract
The invention discloses a kind of low-power consumption to save area active RC complex filter, it is inputted by the road I and the road Q two paths of differential signals, by bandpass filtering unit, it obtains the road I and the road Q two paths of differential signals exports, bandpass filtering unit includes the first to the 16th resistance, the first to the 6th capacitor, the first amplifier and the second amplifier；The road I anode input signal connects the one end first resistor (R1) by port (IINP) input, and the other end of first resistor (R1) connects with one end of one end of second resistance (R2), one end of first capacitor (C1) and the 7th resistance (R7) respectively；The other end of second resistance (R2) connects with one end of the second capacitor (C2), 3rd resistor (R3) respectively；The other end of 3rd resistor (R3) connects with the road Q cathode output signal port (QOUTN).The present invention only realizes second-order complex filter function with a pair of operational amplifiers, reduces power consumption, has significantly saved chip area, while may make up the complex filter of higher order by cascade.
Description
Technical field
The present invention relates to a kind of low-power consumption to save area active RC complex filter, belongs to complex filter technical field.
Background technique
In radio-frequency receiving system, complex filter is responsible for the especially image signal of the interference signal except radiofrequency signal
Effectively inhibited, is the nucleus module that radio frequency receives system.Compared to passive filter, active filter is more suitable on piece
It is integrated, and considerable gain can be provided, while also bringing very important power consumption.In order to realize low-power consumption application, to multiple
The optimised power consumption of wavenumber filter is most important.
There are following some problems for existing complex filter: (1) mainly being cascaded by first-order filtering, the function of consumption
Consumption is big and chip area is big；(2) structure is complicated for the complex filter of a small number of double operationals realization second-order filter functions, network capacitance
Resistance value is larger, and chip area is big, causes bigger by parasitic effects.
Summary of the invention
Technical problem to be solved by the present invention lies in when overcoming existing complex filter one or second-order filter to be cascaded
Structure is complicated, the deficiency that the power consumption of consumption is big and chip area is big, and it is multiple that the present invention provides a kind of low-power consumption province area Active RC
Wavenumber filter is used only using the active RC complex filter network topology simplified compared to the cascade complex filter of single order
A pair of operational amplifiers just realizes second-order complex filtering, has saved the electric current of half, has realized same filter effect, significantly
Power consumption is reduced, while network parameter is more reasonable, significantly reduces chip area.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of low-power consumption province area active RC complex filter, is inputted by the road I and the road Q two paths of differential signals, by bandpass filtering
Unit obtains the road I and the road Q two paths of differential signals and exports, the bandpass filtering unit include the first to the 16th resistance, first to
6th capacitor, the first amplifier and the second amplifier；
Wherein, by one end of the road I anode input signal port connection first resistor, the other end of first resistor is electric with second respectively
One end of resistance, one end of first capacitor are connected with one end of the 7th resistance；The other end of the second resistance is electric with second respectively
One end of appearance, 3rd resistor one end be connected after be connected to the positive input terminal of the first amplifier, the negative output terminal of the first amplifier and the
The other end of two capacitors is connected to the road I cathode output signal port after being connected；
By the road I cathode input signal port connect the 4th resistance one end, the other end of the 4th resistance respectively with the 5th resistance
One end of one end, the other end of first capacitor and the 8th resistance is connected；The other end of 5th resistance respectively with third capacitor
One end, the 6th resistance one end be connected after be connected to the negative output terminal of the first amplifier, the positive output end and third of the first amplifier
The other end of capacitor is connected to the road I anode output signal port after being connected；
By one end of the road Q anode input signal port connection twelfth resistor, the other end of twelfth resistor is respectively with the 13rd
One end of resistance, the 4th capacitor one end be connected with one end of the 9th resistance；The other end of the thirteenth resistor is respectively with
One end of five capacitors, one end of eleventh resistor are connected to the positive input terminal of the second amplifier, the negative output of the second amplifier after being connected
End is connected to the road Q cathode output signal port after being connected with the other end of the 5th capacitor；
The road Q cathode input signal port is connected to one end of the 14th resistance, the other end of the 14th resistance is respectively with the 15th
One end of one end of resistance, the other end of the 4th capacitor and the tenth resistance is connected；The other end of 15th resistance respectively with
One end of 6th capacitor, the 16th resistance one end be connected after be connected to the negative input end of the second amplifier, the second amplifier it is just defeated
Outlet is connected to the road Q anode output signal port after being connected with the other end of the 6th capacitor；
Also, the other end of the other end of the 3rd resistor, the 8th resistance is connected to the road Q cathode output signal port；Institute
The other end of the other end, the 7th resistance of stating the 6th resistance is connected to the road Q anode output signal port；9th resistance
The other end, the 16th resistance the other end be connected to the road I cathode output signal port；The other end of tenth resistance,
The other end of 11 resistance is connected to the road I anode output signal port.
Further, as a preferred technical solution of the present invention, the active RC complex filter is by several
The multistage complex filter of the unit cascaded composition of bandpass filtering.
Further, as a preferred technical solution of the present invention, the active RC complex filter is to include one
The second-order complex filter of bandpass filtering unit.
Further, as a preferred technical solution of the present invention, the active RC complex filter is two band logicals
The quadravalence complex filter that filter unit cascade is constituted.
The present invention by adopting the above technical scheme, can have the following technical effects:
Low-power consumption provided by the invention saves area active RC complex filter, constitutes network by operational amplifier and capacitance resistance and opens up
It flutters, I, Q two paths of differential signals, by the topological network difference output, realize plural bandpass filtering after input terminal input；This hair
It is bright to realize second-order complex band-pass filtering property with a pair of operational amplifiers, relative to the cascade complex filter of single order, subtract
It is a half the number of operational amplifier, that is, reduces general static current of lcd.Due to inflow related with output port voltage
The electric current of all complex signals of amplifier input terminal electric current, outflow amplifier input terminal is only undertaken by a capacitor, so transmission
There is no real number item in function expression denominator, that is, requires centre frequency equal with the three dB bandwidth of corresponding low-pass filter, it is just low
The intermediate-frequency receiver of requirement in to(for) filtering characteristic can satisfy this condition.Using such a feature, compared to similar
The second-order complex low-pass filter network topology of type is more simplified, and network parameter is more reasonable.
Also, the present invention only realizes second-order complex filtering with a pair of operational amplifiers, while having simplified network topology, reaches
The effect for inhibiting interference signal has been arrived, has significantly reduced power consumption and chip area, while being carried out with the second-order complex filter unit
Cascade the complex filter that higher order can be achieved.
Detailed description of the invention
Fig. 1 is the electrical block diagram that low-power consumption of the present invention saves area active RC complex filter.
Fig. 2 is the schematic diagram for the quadravalence complex bandpass filters that the present invention realizes.
Fig. 3 is the filtering curve for the quadravalence Butterworth complex bandpass filters that the present invention realizes.
Specific embodiment
Embodiments of the present invention are described with reference to the accompanying drawings of the specification.
As shown in Figure 1, the present invention devises a kind of low-power consumption province area active RC complex filter, mainly by the road I and the road Q
Two paths of differential signals input obtains the road I and the road Q two paths of differential signals exports by bandpass filtering unit.
The structure of the bandpass filtering unit is as shown in Figure 1, mainly include the first to the 16th resistance, the first to the 6th electricity
Appearance, the first amplifier OTA1 and the second amplifier OTA2；By one end of the road I anode input signal port IINP connection first resistor R1,
The other end of first resistor R1 one end phase with one end of second resistance R2, one end of first capacitor C1 and the 7th resistance R7 respectively
Even；The other end of the second resistance R2 is connected to after being connected respectively with one end of one end of the second capacitor C2,3rd resistor R3
The positive input terminal of first amplifier OTA1, the negative output terminal of the first amplifier OTA1 are connected to after being connected with the other end of the second capacitor C2
The road I cathode output signal port IOUTN；
By one end of the 4th resistance R4 of the road I cathode input signal port IINN connection, the other end of the 4th resistance R4 is respectively with
One end of one end of five resistance R5, the other end of first capacitor C1 and the 8th resistance R8 is connected；The 5th resistance R5's is another
End is connected to the negative output terminal of the first amplifier OTA1 after being connected respectively with one end of one end of third capacitor C3, the 6th resistance R6,
The positive output end of first amplifier OTA1 is connected to the road I anode output signal port after being connected with the other end of third capacitor C3
IOUTP；
By one end of the road Q anode input signal port QINP connection twelfth resistor R12, the other end point of twelfth resistor R12
It is not connected with one end of one end of thirteenth resistor R13, one end of the 4th capacitor C4 and the 9th resistance R9；The thirteenth resistor
The other end of R13 is connected to the second amplifier OTA2 after being connected respectively with one end of one end of the 5th capacitor C5, eleventh resistor R11
Positive input terminal, the negative output terminal of the second amplifier OTA2 be connected to after being connected with the other end of the 5th capacitor C5 the road Q cathode output
Signal port QOUTN；
By one end of the 14th resistance R14 of the road Q cathode input signal port QINN connection, the other end point of the 14th resistance R14
It is not connected with one end of the 15th resistance R15, the other end of the 4th capacitor C4 and one end of the tenth resistance R10；Described 15th
The other end of resistance R15 is connected to the second amplifier after being connected respectively with one end of one end of the 6th capacitor C6, the 16th resistance R16
The negative input end of OTA2, the positive output end of the second amplifier OTA2 are connected to the road Q anode after being connected with the other end of the 6th capacitor C6
Output signal port QOUTP；
Also, the other end of the 3rd resistor R3, the other end of the 8th resistance R8 are connected to the road Q cathode output signal port
QOUTN；The other end of the 6th resistance R6, the other end of the 7th resistance R7 are connected to the road Q anode output signal port
QOUTP；The other end of the 9th resistance R9, the other end of the 16th resistance R16 are connected to the road I cathode output signal port
IOUTN；The other end of the tenth resistance R10, the other end of eleventh resistor R11 are connected to the road I anode output signal end
Mouth IOUTP.
The working principle of the invention is: after the road I anode input signal is inputted by port IINP, passing through resistance R1, R2, R7
Electric current, which is generated, with the network that capacitor C1 is constituted flows into the first amplifier OTA1 positive input terminal；The road Q cathode QOUTN output signal, passes through
The network that resistance R1, R2, R7 and capacitor C1 are constituted generates electric current and flows into the first amplifier OTA1 positive input terminal；The road Q anode QOUTP is defeated
Signal out generates electric current by 3rd resistor R3 and flows into the first amplifier OTA1 positive input terminal；Three road current signals are superimposed in node 1
It is flow to the road I cathode output end mouth IOUTP by by the second capacitor C2, obtains filtered signal.The road I cathode input signal passes through
After port IINN input, electric current is generated by the network that resistance R4, R5, R6 and first capacitor C1 are constituted and flows into the first amplifier OTA1
Positive input terminal；The road Q cathode QOUTN output signal generates electric current by the network that resistance R1, R2, R7 and first capacitor C1 are constituted
Flow into the first amplifier OTA1 negative input end；The road Q cathode QOUTN output signal generates electric current by the 6th resistance R6 and flows into first
Amplifier OTA1 negative input end；Three road current signals are after node superposition through flowing to the road I cathode output end mouth by third capacitor C3
IOUTN obtains filtered signal.
In the present invention, the handling principle of the positive and negative input signal circulation in the road Q is consistent with the positive and negative input signal in the road I.Pass through
Transfer function is constructed, so that being free of real number item in transfer function denominator, greatly reduces the use of circuit element, while this is also wanted
The half of centering frequency three dB bandwidth is equal, this is reasonable in low intermediate frequency receiver.Using such a feature, compare
It is more simplified in the second-order complex low-pass filter network topology of same type, network parameter is more reasonable.
Also, active RC complex filter of the invention, can be by several bandpass filterings it is unit cascaded constitute it is more
Rank complex bandpass filters.As shown in Figure 1, including that a bandpass filtering unit is constituted by active RC complex filter of the present invention
Second-order complex bandpass filter, only realize second-order complex filtering with a pair of operational amplifiers, while having simplified network and having opened up
It flutters, has achieved the effect that inhibit interference signal.
As shown in Fig. 2, multiple for the quadravalence that active RC complex filter of the present invention is two unit cascaded compositions of bandpass filtering
Second-order complex bandpass filtering unit of the invention need to only be carried out simple cascade by number bandpass filter, multiple using the second order
Number filter unit cascade the complex filter of achievable higher order.
As shown in figure 3, for the filtering curve for the quadravalence Butterworth complex bandpass filters realized using the present invention.
From figure 3, it can be seen that three dB bandwidth is about 4.12M, 0.5dB bandwidth is about 3.3M, centre frequency 2M, gain 15dB, mirror image
Inhibit than being about 24dB.By simulation curve as can be seen that the quadravalence Butterworth plural number bandpass filtering realized using the present invention
Device meets the requirement in radio-frequency transmitter for complex bandpass filters well.
To sum up, the present invention only realizes second-order complex filter function with a pair of operational amplifiers, significantly reduces power consumption, makes
Resistance capacitance quantity is few and numerical value is small, has significantly saved chip area, while the second-order complex filter unit being cascaded, can
To constitute the complex filter of higher order.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Claims (4)
1. a kind of low-power consumption saves area active RC complex filter, is inputted by the road I and the road Q two paths of differential signals, filtered by band logical
Wave unit, obtains the road I and the road Q two paths of differential signals exports, it is characterised in that: the bandpass filtering unit includes first to the tenth
Six resistance, the first to the 6th capacitor, the first amplifier and the second amplifier；
Wherein, by the road I anode input signal port (IINP) connection first resistor (R1) one end, first resistor (R1) it is another
End is connected with one end of one end of second resistance (R2), one end of first capacitor (C1) and the 7th resistance (R7) respectively；Described
The other end of two resistance (R2) is connected to first after being connected respectively with one end of one end of the second capacitor (C2), 3rd resistor (R3)
The positive input terminal of amplifier (OTA1), the negative output terminal of the first amplifier (OTA1) connect after being connected with the other end of the second capacitor (C2)
In the road I cathode output signal port (IOUTN)；
The road I cathode input signal port (IINN) is connected to one end of the 4th resistance (R4), the other end point of the 4th resistance (R4)
It is not connected with one end of one end of the 5th resistance (R5), the other end of first capacitor (C1) and the 8th resistance (R8)；Described 5th
The other end of resistance (R5) is connected to the first fortune after being connected respectively with one end of one end of third capacitor (C3), the 6th resistance (R6)
The negative output terminal of (OTA1) is put, the positive output end of the first amplifier (OTA1) is connected to after being connected with the other end of third capacitor (C3)
The road I anode output signal port (IOUTP)；
By the road Q anode input signal port (QINP) connection twelfth resistor (R12) one end, twelfth resistor (R12) it is another
One end is connected with one end of one end of thirteenth resistor (R13), one end of the 4th capacitor (C4) and the 9th resistance (R9) respectively；Institute
State thirteenth resistor (R13) the other end be connected respectively with one end of one end of the 5th capacitor (C5), eleventh resistor (R11) after
It is connected to the positive input terminal of the second amplifier (OTA2), the other end of the negative output terminal of the second amplifier (OTA2) and the 5th capacitor (C5)
The road Q cathode output signal port (QOUTN) is connected to after being connected；
By the road Q cathode input signal port (QINN) connect the 14th resistance (R14) one end, the 14th resistance (R14) it is another
One end respectively with one end of the 15th resistance (R15), the other end of the 4th capacitor (C4) and one end phase of the tenth resistance (R10)
Even；The other end of 15th resistance (R15) one end with one end of the 6th capacitor (C6), the 16th resistance (R16) respectively
It is connected to the negative input end of the second amplifier (OTA2) after being connected, the positive output end of the second amplifier (OTA2) and the 6th capacitor (C6)
The other end is connected to the road Q anode output signal port (QOUTP) after being connected；
Also, the other end of the 3rd resistor (R3), the other end of the 8th resistance (R8) are connected to the road Q cathode output signal
Port (QOUTN)；The other end of 6th resistance (R6), the other end of the 7th resistance (R7) are connected to the output of the road Q anode
Signal port (QOUTP)；It is negative that the other end of 9th resistance (R9), the other end of the 16th resistance (R16) are connected to the road I
Pole output signal port (IOUTN)；The other end of tenth resistance (R10), the other end of eleventh resistor (R11) are all connected with
To the road I anode output signal port (IOUTP).
2. low-power consumption saves area active RC complex filter according to claim 1, it is characterised in that: the active RC complex
Filter is by the unit cascaded multistage complex filter constituted of several bandpass filterings.
3. low-power consumption saves area active RC complex filter according to claim 2, it is characterised in that: the active RC complex
Filter is the second-order complex filter comprising a bandpass filtering unit.
4. low-power consumption saves area active RC complex filter according to claim 2, it is characterised in that: the active RC complex
Filter is the quadravalence complex filter of two unit cascaded compositions of bandpass filtering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102494.7A CN109889183A (en) | 2019-02-01 | 2019-02-01 | A kind of low-power consumption province area active RC complex filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910102494.7A CN109889183A (en) | 2019-02-01 | 2019-02-01 | A kind of low-power consumption province area active RC complex filter |
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| CN109889183A true CN109889183A (en) | 2019-06-14 |
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| CN201910102494.7A Pending CN109889183A (en) | 2019-02-01 | 2019-02-01 | A kind of low-power consumption province area active RC complex filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504946A (en) * | 2019-09-20 | 2019-11-26 | 中国电子科技集团公司第五十四研究所 | A kind of multifunctional filter circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664600A (en) * | 2012-05-23 | 2012-09-12 | 东南大学 | Second-order complex band-pass filter circuit for implementing high-order complex filter |
-
2019
- 2019-02-01 CN CN201910102494.7A patent/CN109889183A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664600A (en) * | 2012-05-23 | 2012-09-12 | 东南大学 | Second-order complex band-pass filter circuit for implementing high-order complex filter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504946A (en) * | 2019-09-20 | 2019-11-26 | 中国电子科技集团公司第五十四研究所 | A kind of multifunctional filter circuit |
| CN110504946B (en) * | 2019-09-20 | 2024-03-22 | 中国电子科技集团公司第五十四研究所 | Multifunctional filter circuit |
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