CN100347954C - Switchable high frequency bandpass filter - Google Patents

Switchable high frequency bandpass filter Download PDF

Info

Publication number
CN100347954C
CN100347954C CNB031241050A CN03124105A CN100347954C CN 100347954 C CN100347954 C CN 100347954C CN B031241050 A CNB031241050 A CN B031241050A CN 03124105 A CN03124105 A CN 03124105A CN 100347954 C CN100347954 C CN 100347954C
Authority
CN
China
Prior art keywords
frequency
switchable
switching signal
coupled
bandpass filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB031241050A
Other languages
Chinese (zh)
Other versions
CN1543066A (en
Inventor
叶明训
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delta Electronics Inc
Original Assignee
Delta Electronics Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delta Electronics Inc filed Critical Delta Electronics Inc
Priority to CNB031241050A priority Critical patent/CN100347954C/en
Publication of CN1543066A publication Critical patent/CN1543066A/en
Application granted granted Critical
Publication of CN100347954C publication Critical patent/CN100347954C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Landscapes

  • Filters And Equalizers (AREA)

Abstract

The invention relates to a switchable high-frequency band-pass filter, which comprises an input node, an output node, a switchable LC resonator and a switching signal input interface circuit. The switchable LC resonator is coupled between the input node and the output node for providing switchable filter transform functions for high frequency signals of different frequencies transmitted between the input node and the output node. The switching signal input interface circuit is coupled to the switchable LC resonator. A switching signal is applied to the switchable LC resonator via the switching signal input interface circuit to control the switchable LC resonator to provide an appropriate one of the plurality of switchable filter transfer functions for each of the plurality of high frequency signals having different frequencies.

Description

Switchable high freguency bandpass filter
Technical field
The present invention relates to a kind of high freguency bandpass filter.The present invention be more particularly directed to a kind of switchable high freguency bandpass filter, be applied in the high frequency communication technique field, can provide different filter transform functions respectively the high-frequency signal of two different frequencies.
Background technology
In the high frequency communication technique field of today,, developed multiple frequency communication electronic product, for example dual-band mobile phone or multi-frequency mobile phone in order to increase the spectral range that can be used for communication.Typically, use in the communication electronic product in multiple frequency, must be respectively at the suitable composition assembly circuit of each operating frequency design, to answer the particular demands of each operating frequency.As a result, cause multiple frequency too much, not only hindered the size of high frequency communication system to dwindle, also improve production cost with the number of the composition assembly circuit in the communication electronic product.
In order to reduce the size of multiple frequency, expect that each operating frequency can share identical composition assembly circuit, to reduce the number of necessary composition assembly with the communication electronic product.Yet each high-frequency characteristic of forming assembly circuit is neither identical, so be difficult to be applied to each operating frequency.In other words, if each service frequency signal is shared identical composition assembly circuit, then may suffer from the problem that interferes with each other between the signal of each operating frequency.
For example, high freguency bandpass filter is applied in the high frequency communication system often, in order to carry out the function that frequency is selected.Use in the communication electronic product in multiple frequency, for the function that each operating frequency is provided best frequency select, must provide different filter transform functions respectively with high-frequency signal at the high freguency bandpass filter of each operating frequency design specialized to different frequency.Yet as previously mentioned, this mode has not only hindered multiple frequency to dwindle with the size of communication electronic product, also improves its production cost.
Summary of the invention
Because foregoing problems, one object of the present invention is to provide a kind of switchable high freguency bandpass filter, can provide two kinds of different filter transform functions to give two kinds of different high-frequency signals, improving the frequency selective power, and reduce the interference between each frequency signal.
Another object of the present invention is to provide a kind of switchable high freguency bandpass filter, can provide two kinds of different filter transform functions to give two kinds of different high-frequency signals, reducing the number of the necessary composition electronic building brick that is associated with high freguency bandpass filter, and minification and reducing production costs.
According to an embodiment of the present invention, a kind of switchable high freguency bandpass filter is provided, comprising: an input node and an output node, a switchable LC resonator and switch signal input interface circuit.This switchable LC resonator is coupled between this input node and this output node, is used for to providing a plurality of switchable filter transform functions via a plurality of high-frequency signals that different frequency is arranged that transmit between this input node and this output node.This switching signal input interface circuit is coupled to this switchable LC resonator.One switches signal is applied to this switchable LC resonator via this switching signal input interface circuit, provides a suitable function in these a plurality of switchable filter transform functions to control this switchable LC resonator respectively for these a plurality of high-frequency signals with different frequency.
Preferably, this switchable LC resonator comprises an inductive unit, is coupled between this input node and ground; One first capacitive unit is coupled between this input node and ground, makes this inductive unit and this first capacitive unit constitute one first state LC resonant circuit in parallel; And one second capacitive unit, be coupled between this input node and ground, make this inductive unit, this first capacitive unit, constitute one second state LC resonant circuit in parallel with this second capacitive unit.
Preferably, this switching signal is a direct current voltage signal, has a predetermined accurate and predetermined high voltage level in low-voltage position, and to be in this predetermined low-voltage position punctual when this switching signal, this switching signal is controlled this second capacitive unit becomes the state of energizing, and when this switching signal is in this predetermined high voltage level, this switching signal is controlled this second capacitive unit becomes the state of not energizing, and makes this switchable LC resonator switch between this first state parallel connection LC resonant circuit and this second state LC resonant circuit in parallel.
Description of drawings
Fig. 1 shows the circuit diagram according to switchable high freguency bandpass filter of the present invention.
Fig. 2 (a) shows according to the high frequency equivalent circuit schematic diagram of switchable high freguency bandpass filter of the present invention when first state.
Fig. 2 (b) shows according to the high frequency equivalent circuit schematic diagram of switchable high freguency bandpass filter of the present invention when second state.
The filter transform function that is provided when first state according to switchable high freguency bandpass filter of the present invention is provided Fig. 3 (a).
The filter transform function that is provided when second state according to switchable high freguency bandpass filter of the present invention is provided Fig. 3 (b).
The element numbers explanation:
100 switchable high freguency bandpass filters
101 switchable LC resonators
102 switching signal input interface circuits
200 high frequency signal generator
201 first frequencies produce circuit
202 second frequencies produce circuit
300 buffers
400 direct currents stop circuit
C1～C5 electric capacity
The D1 diode
L1, the L2 inductance
R1 resistance
S1, the S2 high-frequency signal
f 1, f 2Frequency
Embodiment
Explanation hereinafter and accompanying drawing will make aforementioned and other purpose of the present invention, feature, more obvious with advantage.Now describe in detail according to the preferred embodiments of the invention with reference to the accompanying drawings.
Fig. 1 shows the circuit diagram according to switchable high freguency bandpass filter 100 of the present invention.With reference to Fig. 1, the input node of switchable high freguency bandpass filter 100 comes mark and its output node to come mark with reference symbol B with reference symbol A.The input node A of switchable high freguency bandpass filter 100 is in order to receive the high-frequency signal of two kinds of different frequencies that high frequency signal generator 200 exported.For example, high frequency signal generator 200 is made up of first frequency generation circuit 201 and second frequency generation circuit 202.It is to have first frequency f in order to generation that first frequency produces circuit 201 1The first high-frequency signal S1, and second frequency to produce circuit 202 be to have second frequency f in order to generation 2The second high-frequency signal S2.In an embodiment of the present invention, the second frequency f of the second high-frequency signal S2 2The first frequency f that is about the first high-frequency signal S1 1Twice.It will be apparent to those skilled in the art that according to switchable high freguency bandpass filter 100 of the present invention to be not limited thereto the embodiment that lift in the place, and can be applicable to have between the first high-frequency signal S1 and the second high-frequency signal S2 situation of any frequency relation.
For example, first frequency generation circuit 201 is formed by different voltage control oscillator (VCO) with second frequency generation circuit 202.Therefore, the suitable fm voltage V of supply TProduce circuit 201 to first frequency and produce circuit 202, can produce the first desired high-frequency signal S1 and the second high-frequency signal S2 with second frequency.In addition, high frequency signal generator 200 is controlled by a switching signal SW, produce that circuit 201 and second frequency produce in the circuit 202 what person is in the state of energizing and what person is in (forbidding manufacture) state of not energizing with the decision first frequency, thereby that determine to be exported from high frequency signal generator 200 is the first high-frequency signal S1 or the second high-frequency signal S2.
As shown in Figure 1, in an embodiment of the present invention, the first high-frequency signal S1 and the second high-frequency signal S2 import the input node A of switchable high freguency bandpass filter 100 via a buffer 300.The output node B of switchable high freguency bandpass filter 100 then exports through first high-frequency signal and second high-frequency signal after the filter conversion process.This type of from the output node B of switchable high freguency bandpass filter 100 and the signal that comes via flow resistance retaining circuit 400 always and be coupled to a high frequency output OUT who shares.For example, direct current stops that circuit 400 is a capacitance component (not shown), and the output node B other end that the one end is coupled to switchable high freguency bandpass filter 100 then is coupled to the high frequency output OUT that this is shared.In this case, stop that by the direct current that capacitance component constituted circuit 400 can completely cut off passing through of direct current signal, do not hinder the transmission of high-frequency signal simultaneously.
With reference to Fig. 1, switchable high freguency bandpass filter 100 comprises a switchable LC resonator 101, be coupled between input node A and output node B, and a switching signal input interface circuit 102, be coupled to switchable LC resonator 101.Switchable LC resonator 101 provides switchable filter transform function via the first high-frequency signal S1 and the second high-frequency signal S2 that transmit between input node A and output node B.Via switching signal input interface circuit 102, aforementioned switching signal SW in order to control high frequency signal generator 200 also should be used for controlling switchable LC resonator 101, to determine providing suitable filter transform function respectively for the first high-frequency signal S1 with different frequency and the second high-frequency signal S2.
Particularly, switchable LC resonator 101 comprises an inductive unit that is made of first inductance L 1 and first capacitor C 1; First capacitive unit that is constituted by second capacitor C 2; And second capacitive unit that is constituted by the 3rd capacitor C 3, diode D1, the 4th capacitor C 4, with resistance R 1.In the inductive unit, an end of first inductance L 1 is coupled to an extraneous direct voltage source V DC, the other end then is coupled to input node A and output node B.Moreover an end of first capacitor C 1 is coupled to extraneous direct voltage source V DC, the other end is ground connection then.In first capacitive unit, an end of second capacitor C 2 is coupled to input node A and output node B, and the other end is ground connection then.In second capacitive unit, an end of the 3rd capacitor C 3 is coupled to input node A and output node B, and the other end then is coupled to the P utmost point of diode D1.The 4th capacitor C 4 is coupled in series with between the N utmost point and ground of diode D1.Resistance R 1 also is coupled in series with between the N utmost point and ground of diode D1.
Particularly, switching signal input interface circuit 102 comprises second inductance L 2 and the 5th capacitor C 5.One end of second inductance L 2 is coupled to the P utmost point of diode D1, and the other end is then in order to receive switching signal SW.One end of the 5th capacitor C 5 is coupled in second inductance L 2 in order to receive the terminal of switching signal SW, and the other end is ground connection then.In the present invention, switching signal SW is designed to have the predetermined low-voltage position standard and the d. c. voltage signal of the two states of the high voltage level of being scheduled to.In addition, the switching signal SW with predetermined low-voltage position standard can't conducting diode D1, but the conducting diode D1 then of the switching signal SW with predetermined high voltage level.For d. c. voltage signal, the effect of second inductance L 2 is as short circuit, and the effect of the 5th capacitor C 5 is as open circuit.Therefore, switching signal SW is as the P utmost point that couples directly to diode D1.
Now with reference to Fig. 1 and Fig. 2 (a) and the operation of 2 (b) detailed description according to switchable high freguency bandpass filter 100 of the present invention.At first with reference to Fig. 1, to be positioned at predetermined low-voltage position punctual as the switching signal SW via the switchable LC resonator 101 of switching signal input interface circuit 102 inputs, and diode D1 is not switched on.The result, second capacitive unit that is constituted by the 3rd capacitor C 3, diode D1, the 4th capacitor C 4, with resistance R 1 in the switchable LC resonator 101 is in (open circuit) state of not energizing, that is second capacitive unit is not contributed for the high frequency conversion function that switchable LC resonator 101 is provided.
Fig. 2 (a) shows that foundation switchable high freguency bandpass filter 100 of the present invention is positioned at the punctual high frequency equivalent circuit schematic diagram in predetermined low-voltage position at switching signal SW.With reference to Fig. 2 (a), it is punctual that high frequency signal generator 200 is designed so that proper switching signal SW is positioned at predetermined low-voltage position, and only second frequency generation circuit 202 is in the state of energizing, thereby output has second frequency f 2The second high-frequency signal S2.On the other hand, because first capacitor C 1 in the switchable LC resonator 101 can be equivalent to short circuit under the high frequency field,, first inductance L 1 is coupled in series with between input node A and ground so becoming.As a result, switchable LC resonator 101 becomes a LC antiresonant circuit of being made up of first inductance L 1 and second capacitor C 2.
Later refer again to Fig. 1, when the switching signal SW via the switchable LC resonator 101 of switching signal input interface circuit 102 inputs was positioned at predetermined high voltage level, diode D1 was switched on.The result, second capacitive unit that is constituted by the 3rd capacitor C 3, diode D1, the 4th capacitor C 4, with resistance R 1 in the switchable LC resonator 101 is in the state of energizing, that is second capacitive unit produces contribution to the high frequency conversion function that switchable LC resonator 101 is provided.
Fig. 2 (b) shows according to the high frequency equivalent circuit schematic diagram of switchable high freguency bandpass filter 100 of the present invention when switching signal SW is positioned at predetermined high voltage level.With reference to Fig. 2 (b), when high frequency signal generator 200 was designed so that proper switching signal SW is positioned at predetermined high voltage level, only first frequency generation circuit 201 was in the state of energizing, thereby output has first frequency f 1The first high-frequency signal S1.On the other hand, as previously mentioned,,, first inductance L 1 is coupled in series with between input node A and ground so becoming because first capacitor C 1 in the switchable LC resonator 101 can be equivalent to short circuit under the high frequency field.Moreover, since second capacitive unit that is constituted by the 3rd capacitor C 3, diode D1, the 4th capacitor C 4, with resistance R 1 in the switchable LC resonator 101 is in the state of energizing, so second capacitive unit must come across in the switchable LC resonator 101 shown in Fig. 2 (b).Please note in second capacitive unit shown in Fig. 2 of the present invention (b), diode D1 can be regarded as short circuit under conducting state, and the resistance value of resistance R 1 and the 4th capacitor C 4 is designed to much larger than the resistance value of the 3rd capacitor C 3, makes the 4th capacitor C 4 to be considered as short circuit under the high frequency field.As a result, switchable LC resonator 101 becomes a LC antiresonant circuit of being formed by first inductance L 1, second capacitor C 2, with the 3rd capacitor C 3.
The filter transform function that is provided according to switchable high freguency bandpass filter 100 of the present invention is provided for Fig. 3 (a) and 3 (b), wherein Fig. 3 (a) shows that to be positioned at predetermined low-voltage position punctual as switching signal SW, the filter transform function that switchable high freguency bandpass filter 100 is provided, and Fig. 3 (b) shows when switching signal SW is positioned at predetermined high voltage level, the filter transform function that switchable high freguency bandpass filter 100 is provided.
With reference to Fig. 3 (a), to be positioned at predetermined low-voltage position punctual as switching signal SW, and second frequency produces circuit 202 outputs and has second frequency f 2The second high-frequency signal S2.In the case, as previously mentioned, the LC antiresonant circuit that switchable LC resonator 101 is made up of first inductance L 1 and second capacitor C 2.From Fig. 3 (a) as can be known, switchable LC resonator 101 provides suitable filter transform function, with to having second frequency f 2The second high-frequency signal S2 carry out desired bandpass filtering function.
With reference to Fig. 3 (b), when switching signal SW was positioned at predetermined high voltage level, first frequency produced circuit 201 outputs and has first frequency f 1The first high-frequency signal S1.In the case. as previously mentioned, the LC antiresonant circuit that switchable LC resonator 101 is formed by first inductance L 1, second capacitor C 2, with the 3rd capacitor C 3.Because the existence of the 3rd capacitor C 3 makes the filter transform function of switchable LC resonator 101 be offset left, so can carry out desired bandpass filtering function to the first high-frequency signal S1 with lower frequency.In addition, clear as can be known from Fig. 3 (b), switchable LC resonator 101 can successfully prevent to have 2f under this state 1The second harmonic noise HN of frequency pass through, realize lowering the advantage that second harmonic noise HN disturbs.
In sum, can provide two kinds of different transforming function transformation functions to two kinds of different frequency signals, improve the frequency selective power, thereby reduce the interference between each frequency signal according to the switchable high freguency bandpass filter of the present invention.Moreover, can provide two kinds of different transforming function transformation functions to two kinds of different frequency signals according to switchable high freguency bandpass filter of the present invention, thereby reduce the number of necessary composition electronic building brick, the realization minification also reduces cost.
Though the present invention is illustrated as illustration by preferred embodiment, should understand: the invention is not restricted to the embodiment that this is disclosed.On the contrary, the present invention tends to contain tangible for a person skilled in the art various modifications and similar configuration.Therefore, the scope of claim should be according to the widest annotation, and this type of is revised and similar configuration to contain all.

Claims (12)

1.一种可切换的高频带通滤波器；其包含：1. A switchable high frequency bandpass filter; it comprises: 一输入节点与一输出节点；an input node and an output node; 一可切换的LC谐振器，包含，一电感性单元，耦合于所述的输入节点与地面间；一第一电容性单元，耦合于所述的输入节点与地面间，使得所述的电感性单元与所述的第一电容性单元构成一第一状态并联LC谐振电路；以及一第二电容性单元，耦合于所述的输入节点与地面间，使得所述的电感性单元、所述的第一电容性单元、与所述的第二电容性单元构成一第二状态并联LC谐振电路，其中所述可切换的LC谐振器耦合于所述的输入节点与所述的输出节点间，用以提供多个可切换的滤波器变换函数以经由所述的输入节点与所述的输出节点间传送的具有不同频率的多个高频信号，以及A switchable LC resonator, comprising, an inductive unit coupled between the input node and the ground; a first capacitive unit coupled between the input node and the ground such that the inductive The unit and the first capacitive unit constitute a first-state parallel LC resonant circuit; and a second capacitive unit is coupled between the input node and the ground, so that the inductive unit, the The first capacitive unit and the second capacitive unit constitute a second-state parallel LC resonant circuit, wherein the switchable LC resonator is coupled between the input node and the output node for use in to provide a plurality of switchable filter transform functions for a plurality of high frequency signals having different frequencies transmitted between said input node and said output node, and 一切换信号输入接口电路，耦合至所述的可切换的LC谐振器，a switching signal input interface circuit, coupled to the switchable LC resonator, 其中一切换信号经由所述的切换信号输入接口电路施加至所述的可切换的LC谐振器，以控制所述的可切换的LC谐振器对于所述的具有不同频率的多个高频信号分别提供所述的多个可切换的滤波器变换函数中的一个适当的函数。A switching signal is applied to the switchable LC resonator via the switching signal input interface circuit, so as to control the switchable LC resonator to respond to the multiple high-frequency signals with different frequencies respectively A suitable one of said plurality of switchable filter transform functions is provided. 2.根据权利要求1所述的可切换的高频带通滤波器，其中所述的切换信号是一直流电压信号，具有一预定的低电压位准与一预定的高电压位准，并且当所述的切换信号处于所述的预定的低电压位准时，所述的切换信号控制所述的第二电容性单元成为一赋能状态，而当所述的切换信号处于所述的预定的高电压位准时，所述的切换信号控制所述的第二电容性单元成为一不赋能状态，使得所述的可切换的LC谐振器切换于所述的第一状态并联LC谐振电路与所述的第二状态并联LC谐振电路间。2. The switchable high-frequency bandpass filter according to claim 1, wherein said switching signal is a DC voltage signal having a predetermined low voltage level and a predetermined high voltage level, and when When the switching signal is at the predetermined low voltage level, the switching signal controls the second capacitive unit to be in an enabled state, and when the switching signal is at the predetermined high voltage level voltage level, the switching signal controls the second capacitive unit to be in a non-energized state, so that the switchable LC resonator is switched in the first state to parallel the LC resonant circuit and the The second state is connected in parallel between the LC resonant circuit. 3.根据权利要求2所述的可切换的高频带通滤波器，还包括：3. The switchable high frequency bandpass filter according to claim 2, further comprising: 一直流阻挡电路，具有一第一端子与一第二端子，其中所述的第一端子耦合于所述的输出节点而所述的第二端子作为一共享的高频输出端，用以阻绝一直流信号的通过。A DC blocking circuit has a first terminal and a second terminal, wherein the first terminal is coupled to the output node and the second terminal is used as a shared high-frequency output terminal for blocking constant flow signal through. 4.根据权利要求2所述的可切换的高频带通滤波器，还包括：4. The switchable high frequency bandpass filter according to claim 2, further comprising: 一高频信号发生器，耦合于所述的输入节点，用以产生所述的具有不同频率的多个高频信号并且由所述的切换信号所控制，使得在任何时间中仅允许所述的多个高频信号中的一个输入所述的输入节点。A high-frequency signal generator, coupled to the input node, is used to generate the plurality of high-frequency signals with different frequencies and is controlled by the switching signal so that only the above-mentioned One of the plurality of high-frequency signals is input to the input node. 5.根据权利要求4所述的可切换的高频带通滤波器，还包括：5. The switchable high frequency bandpass filter according to claim 4, further comprising: 一缓冲器，耦合于所述的高频信号发生器与所述的输入节点间。A buffer is coupled between the high frequency signal generator and the input node. 6.根据权利要求4所述的可切换的高频带通滤波器，其中所述的高频信号发生器包括：6. The switchable high frequency bandpass filter according to claim 4, wherein said high frequency signal generator comprises: 一第一频率产生电路，耦合于一调频电压与所述的输入节点间，用以产生具有第一频率的一第一高频信号，以及a first frequency generating circuit, coupled between a frequency modulation voltage and the input node, for generating a first high frequency signal with a first frequency, and 一第二频率产生电路，耦合于所述的调频电压与所述的输入节点间，用以产生具有第二频率的一第二高频信号，a second frequency generating circuit, coupled between the frequency modulation voltage and the input node, for generating a second high frequency signal with a second frequency, 其中所述的第二频率大于所述的第一频率，并且当所述的切换信号处于所述的预定的低电压位准时，所述的切换信号控制所述的第二频率产生电路成为一赋能状态，从而允许所述的第二高频信号输入所述的输入节点，而当所述的切换信号处于所述的预定的高电压位准时，所述的切换信号控制所述的第二频率产生电路成为一赋能状态，从而允许所述的第一高频信号输入所述的输入节点。Wherein the second frequency is greater than the first frequency, and when the switching signal is at the predetermined low voltage level, the switching signal controls the second frequency generating circuit to become a given enabled state, thereby allowing the second high frequency signal to be input to the input node, and when the switching signal is at the predetermined high voltage level, the switching signal controls the second frequency The generating circuit becomes an enabled state, thereby allowing the first high-frequency signal to be input to the input node. 7.根据权利要求6所述的可切换的高频带通滤波器，其中所述的第二高频信号的所述的第二频率约为所述的第一高频信号的所述的第一频率的两倍。7. The switchable high frequency bandpass filter according to claim 6, wherein said second frequency of said second high frequency signal is about the first frequency of said first high frequency signal twice the frequency. 8.根据权利要求1所述的可切换的高频带通滤波器，其中所述的电感性单元包含：8. The switchable high frequency bandpass filter according to claim 1, wherein said inductive unit comprises: 一第一电感，其一端耦合至一外界直流电压源而其另一端则耦合至所述的输入节点与所述的输出节点，以及a first inductor, one end of which is coupled to an external DC voltage source and the other end thereof is coupled to the input node and the output node, and 一第一电容，其一端耦合至所述的外界直流电压源而其另一端则接地。A first capacitor, one end of which is coupled to the external DC voltage source and the other end is grounded. 9.根据权利要求1所述的可切换的高频带通滤波器，其中所述的第一电容性单元包含：9. The switchable high frequency bandpass filter according to claim 1, wherein said first capacitive unit comprises: 一第二电容，其一端耦合至所述的输入节点与所述的输出节点而其另一端则接地。A second capacitor, one end of which is coupled to the input node and the output node and the other end of which is grounded. 10.根据权利要求1所述的可切换的高频带通滤波器，其中所述的第二电容性单元包含：10. The switchable high frequency bandpass filter according to claim 1, wherein said second capacitive unit comprises: 一第三电容，其一端耦合至所述的输入节点与所述的输出节点；a third capacitor, one end of which is coupled to the input node and the output node; 一二极管，具有一P极与一N极，其中所述的P极耦合至所述的第三电容的另一端与所述的切换信号输入接口电路，用以接收所述的切换信号；A diode having a P pole and an N pole, wherein the P pole is coupled to the other end of the third capacitor and the switching signal input interface circuit for receiving the switching signal; 一第四电容，串联耦合于所述的二极管的所述的N极与地面间；以及a fourth capacitor, coupled in series between the N pole of the diode and ground; and 一电阻，串联耦合于所述的二极管的所述的N极与地面间。A resistor is coupled in series between the N pole of the diode and the ground. 11.根据权利要求10所述的可切换的高频带通滤波器，其中所述的切换信号是一直流电压信号，具有一预定的低电压位准与一预定的高电压位准，并且当所述的切换信号处于所述的预定的低电压位准时，所述的切换信号无法导通所述的二极管，而当所述的切换信号处于所述的预定的高电压位准时，所述的切换信号使所述的二极管导通。11. The switchable high-frequency bandpass filter according to claim 10, wherein said switching signal is a DC voltage signal having a predetermined low voltage level and a predetermined high voltage level, and when When the switching signal is at the predetermined low voltage level, the switching signal cannot conduct the diode, and when the switching signal is at the predetermined high voltage level, the The switching signal turns on the diode. 12.根据权利要求10所述的可切换的高频带通滤波器，其中所述的切换信号输入接口电路包括：12. The switchable high frequency bandpass filter according to claim 10, wherein said switching signal input interface circuit comprises: 一第二电感，其一端耦合至所述的二极管的所述的P极而另一端则用以接收所述的切换信号，以及a second inductor, one end of which is coupled to the P pole of the diode and the other end is used to receive the switching signal, and 一第五电容，其一端耦合于所述的第二电感中用以接收所述的切换信号的所述的另一端，而其另一端则接地。A fifth capacitor, one end of which is coupled to the other end of the second inductor for receiving the switching signal, and the other end of which is grounded.
CNB031241050A 2003-04-29 2003-04-29 Switchable high frequency bandpass filter Expired - Fee Related CN100347954C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB031241050A CN100347954C (en) 2003-04-29 2003-04-29 Switchable high frequency bandpass filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB031241050A CN100347954C (en) 2003-04-29 2003-04-29 Switchable high frequency bandpass filter

Publications (2)

Publication Number Publication Date
CN1543066A CN1543066A (en) 2004-11-03
CN100347954C true CN100347954C (en) 2007-11-07

Family

ID=34321571

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB031241050A Expired - Fee Related CN100347954C (en) 2003-04-29 2003-04-29 Switchable high frequency bandpass filter

Country Status (1)

Country Link
CN (1) CN100347954C (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2862275B1 (en) * 2012-06-18 2021-06-16 InterDigital Madison Patent Holdings, SAS Apparatus and method for inserting electrical power or control signals into a diplexer circuit
US10541713B2 (en) * 2015-06-29 2020-01-21 Skyworks Solutions, Inc. Multiplexers having hybrid circuits with resonators
CN105680898A (en) * 2016-01-08 2016-06-15 上海斐讯数据通信技术有限公司 Circuit for perfecting performance of mobile terminal
JP2021087035A (en) * 2019-11-25 2021-06-03 株式会社村田製作所 High-frequency signal transmission and reception circuit
CN113014222B (en) * 2021-04-26 2023-08-08 哈尔滨海能达科技有限公司 Band-pass filter circuit and electronic equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1224276A (en) * 1997-07-03 1999-07-28 西门子公司 Circuit arrangement for switching and regulating frequency range filter branches connected in parallel with each other
CN1250253A (en) * 1998-08-07 2000-04-12 艾利森电话股份有限公司 Controllable electric wave filter
WO2003015301A1 (en) * 2001-08-10 2003-02-20 Hitachi Metals, Ltd. Bypass filter, multi-band antenna switch circuit, and layered module composite part and communication device using them

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1224276A (en) * 1997-07-03 1999-07-28 西门子公司 Circuit arrangement for switching and regulating frequency range filter branches connected in parallel with each other
CN1250253A (en) * 1998-08-07 2000-04-12 艾利森电话股份有限公司 Controllable electric wave filter
WO2003015301A1 (en) * 2001-08-10 2003-02-20 Hitachi Metals, Ltd. Bypass filter, multi-band antenna switch circuit, and layered module composite part and communication device using them

Also Published As

Publication number Publication date
CN1543066A (en) 2004-11-03

Similar Documents

Publication Publication Date Title
US7535323B2 (en) Bulk acoustic wave filter with reduced nonlinear signal distortion
EP2128979A1 (en) Variable frequency band removing filter
EP2555376A1 (en) Wireless power transmission system
CN101351922A (en) Bandpass filter with multiple attenuation poles
JPWO2002056467A1 (en) Phase shifters and multi-bit phase shifters
CN100347954C (en) Switchable high frequency bandpass filter
KR100397729B1 (en) Filter, Antenna Duplexer, And Communication Apparatus Incorporating The Same
JP2001244704A (en) Thin-film resonator filter and method for extending its band width
US6831530B2 (en) Monolithic LC filter with enhanced magnetic coupling between resonator inductors
EP2773041B1 (en) A two stage source-follower based filter
JP2001069766A (en) Half-bridge inverter
CN114978042A (en) Switched capacitor circuit, voltage controlled oscillator and method of forming a switched capacitor circuit
EP1754308B1 (en) Q enhancement circuit and method
CN1520027A (en) Voltage-controlled oscillator, combined module and communicator
JP2006508579A (en) Decoupling module for decoupling high-frequency signals from voltage power lines
JP2004236111A (en) Voltage-controlled oscillator, composite module, and communication apparatus
US20250015783A1 (en) Hybrid bandpass filter having acoustic wave and electromagnetic resonators
JP3839123B2 (en) Tunable frequency variable filter
JP2015159488A (en) tunable filter
CN219875694U (en) Bipolar point LC filter circuit
CN115986345B (en) Filter, duplexer and multiplexer for improving nonlinear characteristics
CN115333565B (en) RF front-end filters, RF circuits, communication equipment
JP3776199B2 (en) High speed tuning filter
CN111342805B (en) Filter units, filters and electronic equipment with impedance curve adjustment modules
JPH07312543A (en) High frequency switch circuit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20071107

Termination date: 20150429

EXPY Termination of patent right or utility model