CN106656126A - Negative voltage generation circuit, radio frequency switch system and radio frequency switch circuit control method - Google Patents
Negative voltage generation circuit, radio frequency switch system and radio frequency switch circuit control method Download PDFInfo
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- CN106656126A CN106656126A CN201510713059.XA CN201510713059A CN106656126A CN 106656126 A CN106656126 A CN 106656126A CN 201510713059 A CN201510713059 A CN 201510713059A CN 106656126 A CN106656126 A CN 106656126A
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Abstract
The application provides a negative voltage generating circuit, includes: the radio frequency switch circuit comprises a control and delay unit, a first control unit and a second control unit, wherein the control and delay unit receives a control signal for controlling the switching of a switch of the radio frequency switch circuit and outputs a delay signal to set delay time, the delay signal has a first level within the delay time, and the delay signal has a second level outside the delay time; the oscillator unit outputs clock signals with different frequencies according to the delay signals; and a negative voltage generating unit converting a positive voltage into a negative voltage according to the clock signal and outputting the negative voltage, wherein the oscillator unit outputs a first clock signal within the delay time, and the oscillator unit outputs a second clock signal outside the delay time, and the frequency of the first clock signal is higher than that of the second clock signal. According to the application, the switching speed of the radio frequency switching circuit can be improved.
Description
Technical field
The application is related to radio circuit technical field, more particularly to a kind of circuit for generating negative voltage, RF switch system and
Radio-frequency switch circuit control method.
Background technology
In RF switch chip, switching time (switching time) is a weight for weighing switch chip performance
Index is wanted, its value is the smaller the better generally in 1～10 μ s magnitudes.
Fig. 1 is a theory diagram of existing RF switch chip, as shown in figure 1, during normal work, power supply
VDD provides the positive voltage of system work, and negative voltage generation unit 1 provides the negative voltage of system work.In FIG,
RFC is rf signal reception end, for example, can be antenna end, and RF1 and RF2 is respectively RF signal output mouth 1
With RF signal output mouth 2；M1 and M3 are PMOS transistor；M2, M4, M5 and M6 are
Nmos pass transistor, and M5 and M6 is output switch；CTRL is control signal；U is phase inverter.
RF switch chip described in Fig. 1 in normal work, in the presence of control signal CTRL, such as
CTRL=0, then M1, M4 conducting, M2, M3 is closed, and the grid of M5 is presented negative pressure, so M5 is closed,
The grid of M6 is presented malleation, so M6 conductings, radiofrequency signal is from RF2 outputs；Conversely, as CTRL=1,
Then M5 conductings, M6 is closed, and radiofrequency signal is exported from RF1.Thus, when control signal CTRL is in different electricity
When switching between flat, different output switchs can be switched over, by the radiofrequency signal for receiving from different output
Switch output.
It should be noted that the introduction of technical background is intended merely to above the convenient technical scheme to the application carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be in this Shen
Background section please is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
Inventors herein have recognized that, existing RF switch system is unable to reach and not only reduce switching time but also drop
The effect good altogether of low switch system.
The application provides a kind of circuit for generating negative voltage, RF switch system and radio-frequency switch circuit control method, is opening
When concern is changed, negative voltage generation unit is driven using high-frequency clock, to improve switch speed, be changed to use after the completion of switching
Low-speed clock drive negative voltage generation unit, to reduce system power dissipation, thus, be not only to have reduced switching time but also
Reduce system power dissipation.
According to the one side of the embodiment of the present application, there is provided a kind of circuit for generating negative voltage, for for radio-frequency switch circuit
Negative voltage is provided, the radio-frequency switch circuit is switched under control of the control signal to output switch, with from difference
Output switch exports radiofrequency signal, it is characterised in that the circuit for generating negative voltage includes：
Control and delay unit, it is received for controlling the control signal of the switch switching of radio-frequency switch circuit, and is exported
Time delayed signal, to set delay time, in the delay time, the time delayed signal has the first level, in institute
State outside delay time, the time delayed signal has second electrical level；
Oscillator unit, it exports the clock signal of different frequency according to the time delayed signal；And
Negative voltage generation unit, positive voltage is converted to negative voltage and is exported by it according to the clock signal,
Wherein, in the delay time, the oscillator unit exports the first clock signal, in the delay time
Outside, the oscillator unit exports second clock signal, when the frequency of first clock signal is higher than described second
The frequency of clock signal.
According to the other side of the embodiment of the present application, wherein, switch to low level from high level in the control signal
Or from the moment that low level switches to high level, the time delayed signal switches to the first level, when the time delay
Between after, the time delayed signal switches to second electrical level.
According to the other side of the embodiment of the present application, wherein, the delay time is the microsecond of 2 microsecond -5.
According to the other side of the embodiment of the present application, wherein, when the frequency of first clock signal is described second
4-8 times of the frequency of clock signal.
According to the other side of the embodiment of the present application, wherein, the control and delay circuit are monostable flipflops.
According to the one side of the application, there is provided a kind of RF switch system, the RF switch system includes：
Radio-frequency switch circuit, including at least two output switchs, the radio-frequency switch circuit according to control signal, to institute
State output switch to switch over, the radiofrequency signal for receiving is exported from the different output switchs, wherein, institute
State radio-frequency switch circuit carries out the switching under positive voltage and negative voltage；
Circuit for generating negative voltage, the positive voltage is converted to negative voltage by it according to the control signal, by negative electricity
Pressure is supplied to the radio-frequency switch circuit,
The circuit for generating negative voltage includes：
Control and delay unit, it receives the control signal, and exports time delayed signal, to set delay time,
In the delay time, the time delayed signal has the first level, outside the delay time, the time delayed signal tool
There is second electrical level；
Oscillator unit, it exports the clock signal of different frequency according to the time delayed signal；And
Negative voltage generation unit, it produces the negative voltage according to the clock signal, wherein, in the time delay
Interior, the oscillator unit exports the first clock signal, and outside the delay time, the oscillator unit is defeated
Go out second clock signal, the frequency of first clock signal is higher than the frequency of the second clock signal.
According to the one side of the application, there is provided a kind of control method of radio-frequency switch circuit, the radio-frequency switch circuit
Output switch is switched under control of the control signal, to export radiofrequency signal, its feature from different output switchs
It is that the control method of radio-frequency switch circuit includes：
According to being used to control the control signal of the switch switching of radio-frequency switch circuit, time delayed signal is exported, to set time delay
Time, in the delay time, the time delayed signal has the first level, described to prolong outside the delay time
When signal there is second electrical level；
According to the time delayed signal, the clock signal of different frequency is exported；And
According to the clock signal, negative voltage is produced, wherein, in the delay time, the clock signal is the
One clock signal, outside the delay time, the clock signal is second clock signal, the first clock letter
Number frequency higher than the second clock signal frequency.
The beneficial effect of the application is：In switch switching, negative voltage generation unit is driven using high-frequency clock, with
Switch speed is improved, is changed to drive negative voltage generation unit with low-speed clock after the completion of switching, to reduce system power dissipation,
Thus, it is not only to have reduced switching time but also reduced system power dissipation.
With reference to explanation hereinafter and accompanying drawing, the particular implementation of the application is disclose in detail, specify the original of the application
Reason can be in adopted mode.It should be understood that presently filed embodiment is not so limited in scope.
In the range of the spirit and terms of claims, presently filed embodiment includes many changes, modifications and equivalent.
The feature for describing for a kind of embodiment and/or illustrating can be in same or similar mode one or more
It is combined with the feature in other embodiment used in individual other embodiment, or substitute in other embodiment
Feature.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when using herein, but
It is not precluded from the presence of one or more further features, one integral piece, step or component or additional.
Description of the drawings
Included accompanying drawing is used for providing being further understood from the embodiment of the present application, which constitutes the one of specification
Part, for illustrating presently filed embodiment, and comes together to explain the principle of the application with word description.It is aobvious and easy
Insight, drawings in the following description are only some embodiments of the present application, for those of ordinary skill in the art,
Without having to pay creative labor, can be with according to these other accompanying drawings of accompanying drawings acquisition.In the accompanying drawings：
Fig. 1 is a theory diagram of existing RF switch chip；
Fig. 2 is a structural representation of the circuit for generating negative voltage of the present embodiment；
Fig. 3 is the sequential chart of control signal CTRL of the present embodiment, time delayed signal A and clock signal B；
Fig. 4 is a composition schematic diagram of the RF switch system of the present embodiment.
Specific embodiment
Referring to the drawings, by description below, the aforementioned and further feature of the application will be apparent from.In explanation
In book and accompanying drawing, the particular implementation of the application is specifically disclosed, which show can wherein adopt the original of the application
Some embodiments then, it will thus be appreciated that the application is not limited to described embodiment, conversely, the application bag
Include whole modifications, modification and the equivalent for falling within the scope of the appended claims.
Embodiment 1
The embodiment of the present application 1 provides a kind of circuit for generating negative voltage, for providing negative voltage for radio-frequency switch circuit, its
In, the radio-frequency switch circuit is switched under control of the control signal to output switch, with defeated from different output switchs
Go out radiofrequency signal.
Fig. 2 is a structural representation of the circuit for generating negative voltage of the present embodiment, as shown in Fig. 2 the negative voltage is produced
Raw circuit 200 includes control and delay unit 201, oscillator unit 202 and negative voltage generation unit 203.
In the present embodiment, control receives the control for controlling the switch switching of radio-frequency switch circuit with delay unit 201
Signal CTRL processed, and time delayed signal A is exported, it is described to prolong in the delay time t to set delay time t
When signal A there is the first level, outside the delay time, the time delayed signal A has second electrical level；Vibration
Device unit 202 exports clock signal B of different frequency according to the time delayed signal A；Negative voltage generation unit 203
According to clock signal B, positive voltage is converted into negative voltage and is exported.
In the present embodiment, in the delay time t, oscillator unit 202 exports the first clock signal B1,
Outside delay time t, the output second clock signal of oscillator unit 202, the frequency of first clock signal is high
In the frequency of the second clock signal.
In the present embodiment, control signal CTRL can switch between high level and low level, so as to open output
Pass switches over.In the present embodiment, switch to low level from high level in control signal CTRL or cut from low level
It is changed to from the moment of high level, time delayed signal A switches to the first level, after delay time t, time delayed signal A
Switch to second electrical level.
According to the present embodiment, after the control signal CTRL change state of radio-frequency switch circuit, control and delay unit
201 produce one section of delay time t, in delay time t, using high frequency clock negative voltage generation unit 203 are driven,
The voltage for enabling negative voltage generation unit 203 lowers rapidly, so as to reduce the switching time of RF switch；Time delay
After finishing, negative voltage generation unit 203, also, low-frequency clock work is driven to contribute to reducing system using low-frequency clock
System power consumption.
In the present embodiment, control and delay unit 201 for example can be monostable flipflops, when its input control letter
When number having logic to change, output reverts to former output state after postponing a period of time, but the present embodiment is not limited to this,
The control and delay unit 201 can also be other circuits that can produce time delayed signal.
In the present embodiment, the operation principle of oscillator unit 202 and negative voltage generation unit 203 may be referred to existing
Technology, the present embodiment is repeated no more.
In the present embodiment, time delay t can set under thinking provided herein according to selecting, for example,
If the time delay is too short, possibly cannot play preferably reduces the effect of switching time, but if postpone
Between it is long, the power consumption of system may be improved, therefore, it can to consider reduction switching time and reduce system
System the two factors of power consumption setting the time delay, for example, without plus this delay unit 201 and oscillator list
In the case of unit 202, switching time is 5us, and switching time shorten to 2us after having added, then can be with
To be taken as time delay between 2 microsecond～5 microseconds.
In the present embodiment, if cause originally can be just under second clock signal for the too high meeting of the frequency of the first clock signal
Often the efficiency of the negative voltage generating circuit of work declines or operation irregularity, also, if the frequency of the first clock signal is too high
The transient power consumption of system can be increased.Therefore, in the present embodiment, the frequency of the first clock signal needs to meet above-mentioned two
Point requires that i.e. negative voltage generating circuit remains to normal work under the first clock signal, and makes the transient power consumption of system not
Can exceed and limit, be to meet above-mentioned two condition, the first clock signal of the high frequency and the second clock signal of low frequency
Frequency ratio for example can be 4-8.
Fig. 3 is the sequential chart of control signal CTRL of the present embodiment, time delayed signal A and clock signal B, such as
Shown in Fig. 3, when control signal is low level, time delayed signal A can in the relatively low second electrical level of level, now,
Clock signal is the second clock B2 of low frequency；When control signal CTRL switches to the switching of high level from low level
Moment, or control signal CTRL switches to the moment of low level switching, time delayed signal A to be changed into from high level
The first higher level of level, now, clock signal is the first clock B1 of high frequency；Have passed through delay time t
Afterwards, time delayed signal A is changed into the relatively low second electrical level of level, and clock signal is the second clock B2 of low frequency.
In the present embodiment, due to negative voltage generation unit drive be capacitive load, so the frequency of clock signal B
Change does not interfere with its output voltage, while work additionally aiding reduction system power dissipation in the low-speed mode.
Embodiment 2
The embodiment of the present application 2 provides a kind of RF switch system.Fig. 4 is of the RF switch system of the present embodiment
Composition schematic diagram, as shown in figure 4, the RF switch system 400 includes radio-frequency switch circuit 401 and implements 1 institute
The circuit for generating negative voltage 200 stated.
As shown in figure 4, the radio-frequency switch circuit includes at least two output switch M5 and M6, the RF switch
Circuit is switched over according to control signal CTRL to the output switch, by the radiofrequency signal for receiving from difference
The output switch output, wherein, the radio-frequency switch circuit carries out the switching under positive voltage and negative voltage；
Circuit for generating negative voltage 200, according to control signal CTRL, by the positive voltage negative voltage is converted to,
So that negative voltage is supplied into the radio-frequency switch circuit.
In the present embodiment, the radio-frequency switch circuit 401 can have identical to constitute structure, for example, RFC with Fig. 1
It is rf signal reception end, for example, can is antenna end, RF1 and RF2 is respectively the He of RF signal output mouth 1
RF signal output mouth 2；M1 and M3 are PMOS transistor；M2, M4, M5 and M6 are NMOS
Transistor, and M5 and M6 is output switch；CTRL is control signal；U is phase inverter.Open with regard to radio frequency
The operation principle on powered-down road 401, may be referred to the explanation to Fig. 1, be not repeated herein.
For the composition and operation principle of circuit for generating negative voltage 200, embodiment 1 is may be referred to Fig. 2's and Fig. 3
Illustrate, be also not repeated herein.
According to the RF switch system of the present embodiment, after the control signal CTRL change state of radio-frequency switch circuit,
Control produces one section of delay time t with delay unit 201, in delay time t, is driven using high frequency clock negative
Voltage generating unit 203 so that the voltage of negative voltage generation unit 203 can lower rapidly, opens so as to reduce radio frequency
The switching time of pass；After time delay is finished, negative voltage generation unit 203 is driven using low-frequency clock, also, during low frequency
Clock work contributes to reducing system power dissipation.
Embodiment 3
Embodiment 3 provides a kind of control method of radio-frequency switch circuit, control of the radio-frequency switch circuit in control signal
Output switch is switched under system, to export radiofrequency signal from different output switchs.The control method of the present embodiment with
Embodiment 1,2 correspondences.
In the present embodiment, the control method of the radio-frequency switch circuit may include steps of：
S101, basis are used to control the control signal of the switch switching of radio-frequency switch circuit, time delayed signal are exported, to set
Determine delay time, in the delay time, the time delayed signal has the first level, outside the delay time,
The time delayed signal has second electrical level；
S102, according to the time delayed signal, export the clock signal of different frequency；And
S103, according to the clock signal, produce negative voltage,
Wherein, in the delay time, the clock signal is the first clock signal, outside the delay time,
The clock signal is second clock signal, and the frequency of first clock signal is higher than the frequency of the second clock signal
Rate.
With regard to the explanation of above steps, explanation of the embodiment 1 to each unit is may be referred to.
According to the control method of the radio-frequency switch circuit of the present embodiment, the switching time of RF switch can be reduced, also,
Contribute to reducing system power dissipation.
The application is described above in association with specific embodiment, it will be appreciated by those skilled in the art that this
A little descriptions are all exemplary, are not the restriction to the application protection domain.Those skilled in the art can be according to this
The spirit and principle of application makes various variants and modifications to the application, and these variants and modifications are also in scope of the present application
It is interior.
Claims (9)
1. a kind of circuit for generating negative voltage, for providing negative voltage, the radio-frequency switch circuit for radio-frequency switch circuit
Output switch is switched under control of the control signal, to export radiofrequency signal, its feature from different output switchs
It is that the circuit for generating negative voltage includes：
Control and delay unit, it is received for controlling the control signal of the switch switching of radio-frequency switch circuit, and is exported
Time delayed signal, to set delay time, in the delay time, the time delayed signal has the first level, in institute
State outside delay time, the time delayed signal has second electrical level；
Oscillator unit, it exports the clock signal of different frequency according to the time delayed signal；And
Negative voltage generation unit, positive voltage is converted to negative voltage and is exported by it according to the clock signal,
Wherein, in the delay time, the oscillator unit exports the first clock signal, in the delay time
Outside, the oscillator unit exports second clock signal, when the frequency of first clock signal is higher than described second
The frequency of clock signal.
2. circuit for generating negative voltage as claimed in claim 1, it is characterised in that
Low level is switched in the control signal or from the moment that low level switches to high level from high level, it is described
Time delayed signal switches to the first level, and after the delay time, the time delayed signal switches to second electrical level.
3. circuit for generating negative voltage as claimed in claim 1, it is characterised in that
The delay time is the microsecond of 2 microsecond -5.
4. circuit for generating negative voltage as claimed in claim 1, it is characterised in that
The frequency of first clock signal is 4-8 times of the frequency of the second clock signal.
5. circuit for generating negative voltage as claimed in claim 1, it is characterised in that
The control and delay circuit are monostable flipflops.
6. a kind of RF switch system, it is characterised in that the RF switch system includes：
Radio-frequency switch circuit, including at least two output switchs, the radio-frequency switch circuit according to control signal, to institute
State output switch to switch over, the radiofrequency signal for receiving is exported from the different output switchs, wherein, institute
State radio-frequency switch circuit carries out the switching under positive voltage and negative voltage；
Circuit for generating negative voltage, the positive voltage is converted to negative voltage by it according to the control signal, by negative electricity
Pressure is supplied to the radio-frequency switch circuit,
The circuit for generating negative voltage includes：
Control and delay unit, it receives the control signal, and exports time delayed signal, to set delay time,
In the delay time, the time delayed signal has the first level, outside the delay time, the time delayed signal tool
There is second electrical level；
Oscillator unit, it exports the clock signal of different frequency according to the time delayed signal；And
Negative voltage generation unit, it produces the negative voltage according to the clock signal,
Wherein, in the delay time, the oscillator unit exports the first clock signal, in the delay time
Outside, the oscillator unit exports second clock signal, when the frequency of first clock signal is higher than described second
The frequency of clock signal.
7. RF switch system as claimed in claim 6, it is characterised in that
Low level is switched in the control signal or from the moment that low level switches to high level from high level, it is described
Time delayed signal switches to the first level, and after the delay time, the time delayed signal switches to second electrical level.
8. a kind of control method of radio-frequency switch circuit, the radio-frequency switch circuit is under control of the control signal to defeated
Go out switch to switch over, to export radiofrequency signal from different output switchs, it is characterised in that the control of radio-frequency switch circuit
Method processed includes：
According to being used to control the control signal of the switch switching of radio-frequency switch circuit, time delayed signal is exported, to set time delay
Time, in the delay time, the time delayed signal has the first level, described to prolong outside the delay time
When signal there is second electrical level；
According to the time delayed signal, the clock signal of different frequency is exported；And
According to the clock signal, negative voltage is produced,
Wherein, in the delay time, the clock signal is the first clock signal, outside the delay time,
The clock signal is second clock signal, and the frequency of first clock signal is higher than the frequency of the second clock signal
Rate.
9. the control method of radio-frequency switch circuit as claimed in claim 8, it is characterised in that
Low level is switched in the control signal or from the moment that low level switches to high level from high level, it is described
Time delayed signal switches to the first level, and after the delay time, the time delayed signal switches to second electrical level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510713059.XA CN106656126A (en) | 2015-10-28 | 2015-10-28 | Negative voltage generation circuit, radio frequency switch system and radio frequency switch circuit control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510713059.XA CN106656126A (en) | 2015-10-28 | 2015-10-28 | Negative voltage generation circuit, radio frequency switch system and radio frequency switch circuit control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106656126A true CN106656126A (en) | 2017-05-10 |
Family
ID=58816191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510713059.XA Pending CN106656126A (en) | 2015-10-28 | 2015-10-28 | Negative voltage generation circuit, radio frequency switch system and radio frequency switch circuit control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110324062A (en) * | 2019-06-20 | 2019-10-11 | 成都天锐星通科技有限公司 | A kind of quick negative voltage switching circuit |
| WO2022247843A1 (en) * | 2021-05-27 | 2022-12-01 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
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| CN102739217A (en) * | 2011-03-29 | 2012-10-17 | 日立金属株式会社 | High frequency antenna switch module |
| CN103219973A (en) * | 2012-01-19 | 2013-07-24 | 三星电机株式会社 | High-frequency switching circuit and control method thereof |
| CN103888119A (en) * | 2012-12-21 | 2014-06-25 | 三星电机株式会社 | Radio frequency switch circuit |
| CN104335280A (en) * | 2012-06-08 | 2015-02-04 | 高通股份有限公司 | Negative voltage generators |
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| CN102403990A (en) * | 2010-09-14 | 2012-04-04 | 瑞萨电子株式会社 | Radio frequency module |
| CN102739217A (en) * | 2011-03-29 | 2012-10-17 | 日立金属株式会社 | High frequency antenna switch module |
| CN103219973A (en) * | 2012-01-19 | 2013-07-24 | 三星电机株式会社 | High-frequency switching circuit and control method thereof |
| CN104335280A (en) * | 2012-06-08 | 2015-02-04 | 高通股份有限公司 | Negative voltage generators |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110324062A (en) * | 2019-06-20 | 2019-10-11 | 成都天锐星通科技有限公司 | A kind of quick negative voltage switching circuit |
| WO2022247843A1 (en) * | 2021-05-27 | 2022-12-01 | 广东工业大学 | Low-power-consumption negative pressure generator for radio frequency switch |
| US11711075B2 (en) | 2021-05-27 | 2023-07-25 | Guangdong University Of Technology | Low-power consumption negative voltage generator for radio frequency switches |
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