CN104122805B - Digital satellite equipment control signal produces circuit and relevant signal generating method - Google Patents
Digital satellite equipment control signal produces circuit and relevant signal generating method Download PDFInfo
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- CN104122805B CN104122805B CN201310149315.8A CN201310149315A CN104122805B CN 104122805 B CN104122805 B CN 104122805B CN 201310149315 A CN201310149315 A CN 201310149315A CN 104122805 B CN104122805 B CN 104122805B
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Abstract
The present invention proposes a kind of digital satellite equipment control signal and produces circuit and relevant signal generating method, and this control signal produces one of embodiment of circuit and includes comparison circuit, matrix current adjustment circuit, switch, current potential selection circuit and filter circuit.Comparison circuit adjusts the running of matrix current adjustment circuit, to produce first, second and third voltage signal according to reference voltage signal.Current potential selection circuit can arrange the conducting state of switch, respectively first, second and third voltage signal is sent to filter circuit.In the first period, the second voltage signal and tertiary voltage signal alternately can be sent to filter circuit, to produce AC signal by current potential selection circuit.In the second period, the first voltage signal only can be sent to filter circuit by current potential selection circuit, to produce direct current signal.Above-mentioned digital satellite equipment control signal produces the impact that circuit can reduce high-frequency noise and low-frequency noise is caused, and provides direct current signal and the AC signal of low noise.
Description
Technical field
The relevant signal generating circuit of the present invention, the signal of a kind of digital satellite equipment control protocol produces
Circuit and relevant signal generating method.
Background technology
Along with the progress of science and technology, satellite communication has been generally applicable in the middle of daily life, such as, is permitted
Multi-user can receive multimedia video to view and admire by satellite communication.User would generally make
Receive satellite-signal with outdoor antenna, then use box (set top box) demodulation of satellite letter on the machine of indoor
Number to view and admire.Additionally, user can also control disc-shaped antenna (dish antenna) by box on machine
Or the device such as signal selector, hurry back and forth back and forth without in indoor and outdoor, it becomes possible to be easily adjusted dish
The direction of type antenna or selection signal source.
Digital satellite equipment control protocol (digital satellite equipment control protocol, DiSEqC
Protocol) it is a kind of communications protocol being applied between the devices such as box on machine, antenna or signal selector.Counting
In word satellite equipment control protocol, power supply can be transmitted by coaxial wire and carry out two-way signal
Transmission.Such as, when the satellite-signal that box reception antenna on machine is transmitted, on machine, box can be simultaneously by electricity
Source and control signal send antenna to, make the motor in antenna can carry out the running turned to, to adjust sky
The direction of line and can clearer reception satellite-signal.
In digital satellite equipment control protocol, on machine box need the direct current signal transmitting 12～20 volts to
Antenna, and sometimes for the AC signal of superposition 22 kilo hertzs (kilohertz, KHz) on direct current signal,
So that antenna is carried out required control.But, the 22KHz AC signal that on machine, box is provided often has height
The harmonic wave (harmonic) of frequency, causes box on machine to be easily subject to interference from the satellite-signal that antenna is received, and
Have impact on the usefulness of reception, the multimedia video that received thus produce the problems such as deterioration.
Additionally, when the AC signal superposition of 22 kilo hertzs is on direct current signal, the AC signal meeting of 22 kilo hertzs
Cause the noise of low frequency, and the direct current signal level causing box on machine to be transmitted is inaccurate, and cannot be accurate
Ground controls antenna or the running of other devices.
Summary of the invention
In view of this, how in the application of digital satellite equipment control protocol, control letter is mitigated or eliminated
Harmonic wave in number and noise, actually industry has problem to be solved.
This specification provides a kind of digital satellite equipment control signal to produce the embodiment of circuit, includes:
One matrix current adjustment circuit, includes one first end, one second end and one and controls end, this matrix current adjustment circuit
This first end be used for coupling one first preset potential, this second end of this matrix current adjustment circuit is used for coupling
One first end of one first resistance, one second end of this first resistance is for being coupled to the one of one second resistance
First end, one second end of this second resistance is for coupling one first end of one the 3rd resistance, and the 3rd is electric
One second end of resistance is used for coupling one second preset potential；One first switch, is used for being coupled to this electric current and adjusts
This second end of whole circuit and this first end of this first resistance, to receive one second voltage signal；One
Two switches, for being coupled to this second end of this first resistance and this first end of this second resistance, to connect
Receive one first voltage signal；One the 3rd switch, for be coupled to this second end of this second resistance and this
This first end of three resistance, to receive a tertiary voltage signal；One comparison circuit, includes one first defeated
Entering end, one second input and an outfan, this first input end of this comparison circuit is for receiving a ginseng
Examine voltage signal, this second input of this comparison circuit for couple this first resistance this second end and
This first end of this second resistance, to receive this first voltage signal, this outfan coupling of this comparison circuit
Be connected to this control end of this matrix current adjustment circuit, this comparison circuit according to this reference voltage signal and this first
Voltage signal, and adjust the running of this matrix current adjustment circuit；One filter circuit, be coupled to this first switch,
This second switch and the 3rd switch；And a current potential selection circuit, be coupled to this first switch, this
Two switches and the 3rd switch, be alternately turned on this first switch in one first period according to a clock signal
And the 3rd switch one of them, so that this second voltage signal and this tertiary voltage signal are alternately passed
Deliver to this filter circuit, and only turn on this second switch in one second period, so that this first voltage is believed
Number it is sent to this filter circuit；Wherein this filter circuit is by this second voltage signal of this first period and should
Tertiary voltage signal is filtered, to provide an AC signal, and according to this second period this first
Voltage signal provides a direct current signal.
This specification separately provides the embodiment of a kind of digital satellite equipment control signal production method, in order to set
Putting a signal generating circuit and provide digital satellite equipment control signal, this signal generating circuit includes: one
Matrix current adjustment circuit, this matrix current adjustment circuit includes one first end, one second end and one and controls end, should
This first end of matrix current adjustment circuit is used for coupling one first preset potential, this matrix current adjustment circuit this
Two ends are for coupling one first end of one first resistance, and one second end of this first resistance is used for being coupled to one
One first end of the second resistance, one second end of this second resistance is for coupling the one first of one the 3rd resistance
End, one second end of the 3rd resistance is used for coupling one second preset potential；One first switch, for coupling
It is connected to this second end of this matrix current adjustment circuit and this first end of this first resistance, to receive one second electricity
Pressure signal；One second switch, for being coupled to this second end of this first resistance and being somebody's turn to do of this second resistance
First end, to receive one first voltage signal；One the 3rd switch, for being coupled to being somebody's turn to do of this second resistance
This first end of second end and the 3rd resistance, to receive a tertiary voltage signal；One comparison circuit, should
Comparison circuit includes a first input end, one second input and an outfan, being somebody's turn to do of this comparison circuit
First input end is for receiving a reference voltage signal, and this second input of this comparison circuit is used for coupling
This second end of this first resistance and this first end of this second resistance, to receive this first voltage signal,
This outfan of this comparison circuit is coupled to this control end of this matrix current adjustment circuit, this comparison circuit foundation
This reference voltage signal and this first voltage signal, and adjust the running of this matrix current adjustment circuit；One filtering
Circuit, is coupled to this first switch, this second switch and the 3rd switch；And a current potential selection circuit,
It is coupled to this first switch, this second switch and the 3rd switch；The method includes: in one first time
Section is alternately turned on one of them of this first switch and the 3rd switch according to a clock signal, with should
Second voltage signal and this tertiary voltage signal are alternately sent to this filter circuit, and this filter circuit should
This second voltage signal and this tertiary voltage signal of the first period are filtered, to provide an AC signal；
And only turn on this second switch in one second period, so that this first voltage signal is sent to this filtered electrical
Lu Zhong, and this filter circuit provides a direct current signal according to this first voltage signal of this second period.
One of advantage of above-described embodiment is high-frequency noise and low-frequency noise will not coupled to signal generating circuit
The direct current signal exported and AC signal, and high-frequency noise can be reduced and impact that low-frequency noise is caused.
Other advantages of the present invention will explain orally in more detail by the following description and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing further understanding of the present application, constitutes of the application
Point, the schematic description and description of the application is used for explaining the application, is not intended that the application's
Improper restriction.
Fig. 1 is the functional block diagram after the signal generating circuit simplification of one embodiment of the invention.
Fig. 2 is the functional block diagram after an embodiment simplification of the current potential selection circuit of Fig. 1.
After Fig. 3 to Fig. 6 is several embodiments simplification of switch controlling signal produced by current potential selection circuit
Sequential chart.
Fig. 7 is the functional block diagram after an embodiment simplification of the filter circuit of Fig. 1.
Detailed description of the invention
Below in conjunction with relevant drawings, embodiments of the present invention are described.In the drawings, identical mark
Number represent same or similar element or or method flow.
Fig. 1 is the functional block diagram after signal generating circuit 100 simplification of one embodiment of the invention, signal
Generation circuit 100 can be arranged in the equipment that various digital satellite equipment controls and (such as, be arranged on machine
Box), and can be used for producing the direct current signal needed for digital satellite equipment control protocol and AC signal, such as,
The direct current signal of 12～20 volts and the AC signal of 22 kilo hertzs.Signal generating circuit 100 includes voltage
Source circuit 110, comparison circuit 120, matrix current adjustment circuit 130, resistance 141,142 and 143, current potential
Selection circuit 160, switch 171,172 and 173 and filter circuit 180.For making drawing simple and clear and easy
In explanation, other elements of signal generating circuit 100 and annexation are not illustrated in Fig. 1.
Voltage source circuit 110 is positioned to provide the reference voltage signal Vref of multiple unlike signal value, and
And the circuit framework that various active member and/or passive device formed can be used to implement.Such as, use
The circuit frameworks such as band gap (bandgap) circuit or electric charge pump (charge pump) circuit are implemented.In an embodiment
In, corresponding to 12 needed for digital satellite equipment control protocol～20 volt DC signals, voltage source circuit
The 110 reference voltage signal Vref that can produce multiple unlike signal value, make the signal generating circuit 100 can
Produce the direct current signal that signal value is between 12～20 volts accordingly.
Comparison circuit 120 adjusts according to voltage source circuit 110 provided reference voltage signal Vref and electric current
The voltage signal VM that circuit 130 is provided, and it is arranged in correspondence with the running of matrix current adjustment circuit 130.
Comparison circuit 120 can use to be had gain or not to have the circuit framework enforcement of gain.
In the present embodiment, matrix current adjustment circuit 130 uses the mode of transistor to implement, such as, and MOSFET
Transistor and BJT transistor etc..In other embodiments, matrix current adjustment circuit 130 can use various
The circuit framework that active member and/or passive device are formed is implemented.First end of matrix current adjustment circuit 130
It is coupled to the first preset potential V1 (such as, the current potential of 5 volts), the second end of matrix current adjustment circuit 130
Being coupled to the first end of resistance 141, the second end of the first resistance 141 is coupled to the of the second resistance 142
One end, the second end of the second resistance 142 is coupled to the first end of the 3rd resistance 143, the 3rd resistance 143
The second end be coupled to the second preset potential V2 (such as, the current potential of earth terminal).Matrix current adjustment circuit 130
Control end be coupled to comparison circuit 120, it is possible to provided according to the setting and adjusting of comparison circuit 120
Electric current.
In the present embodiment, the current potential of the first preset potential V1 is set above the second preset potential V2
Current potential, in order to explanation.In other embodiments, the current potential of the first preset potential V1 can also be arranged
For the current potential less than the second preset potential V2, and matrix current adjustment circuit 130 is carried out the adjustment of correspondence.
Primary nodal point 151 is coupled to the second end of matrix current adjustment circuit 130 and the first end of resistance 141,
And it is provided that the second voltage signal VH.Secondary nodal point 152 is coupled to the second end and the resistance of resistance 141
First end of 142, and it is provided that the first voltage signal VM.3rd node 153 is coupled to resistance 142
Second end and the first end of resistance 143, and it is provided that tertiary voltage signal VL.In the present embodiment, will
Resistance 141 and 142 is set to have resistance value Rc being substantially the same, and is set to by resistance 143
There is variable resistance value Rv.On the implementation, resistance 143 can include one or more impedor,
And according to the signal value of voltage signal VM and/or other control signal, and can be arranged to required
Resistance value.Therefore, voltage signal VH=VM+Rc (VM/ (Rc+Rv)), and voltage signal VL=VM
-Rc·(VM/(Rc+Rv)).Voltage signal VH, VM and VL are through its of signal generating circuit 100
After the process of his circuit, just can produce required AC signal, and the amplitude of AC signal can be with
Rc (VM/ (Rc+Rv)) presents proportionate relationship.
Owing to when the numerical value difference of reference voltage signal Vref, voltage signal VM also can change therewith.
In one embodiment, in order to make signal generating circuit 100 can all can when different direct current level
The AC signal of output same-amplitude, can adjust the resistance value of resistance 143 according to voltage signal VM
Rv, makes Rc (VM/ (Rc+Rv)) maintain a fixed value, and makes signal generating circuit 100 can export phase
AC signal with amplitude.In another embodiment, it is also possible to according to the signal of reference voltage signal Vref
Value and adjust resistance value Rv of resistance 143, make Rc (VM/ (Rc+Rv)) maintain a fixed value, and make letter
Number producing circuit 100 can export the AC signal of same-amplitude.In another embodiment, it is also possible to point
Do not adjust resistance according to voltage signal VM, reference voltage signal Vref and/or other control signal
141, the resistance value of 142 and 143, makes Rc (VM/ (Rc+Rv)) maintain a fixed value, and makes signal produce
Raw circuit 100 all can export the AC signal of same-amplitude when different direct current level.
Current potential selection circuit 160 can produce circuit 100 signal interiorly or exteriorly with basis signal, and divides
The conducting state of switch 171,172 and 173 is not set with switch controlling signal DM, DH and DL.
In the present embodiment, the mode of switch 171,172 and 173 employing transistor is implemented, in other embodiments
In, switch 171,172 and 173 can also be respectively adopted various active member and/or passive device is formed
Circuit framework implement.Current potential selection circuit 160 can switch 171 and 173 by being alternately turned on, with
The voltage signal Vsqu formed by voltage signal VH and VL is supplied to filter circuit 180, and mat
By one of them of conducting switch 171,172 and 173, by its of voltage signal VH, VM and VL
One of be output as voltage signal Vsqu, to be supplied to filter circuit 180.Voltage signal Vsqu can be
AC signal or direct current signal.
Filter circuit 180 can use various suitable circuit framework, to produce according to voltage signal Vsqu
Raw output signal Vsin, output signal Vsin can be AC signal or direct current signal.Such as, filtered electrical
Road 180 can be implemented to use the modes such as low-pass filter circuit.In one embodiment, filter circuit 180 quilt
Be set at least to decay the signal that frequency is 44 kilo hertzs 20 decibels (decibel, dB) (be 22 relative to frequency
Kilo hertz signal), and by the signal of integral multiple that frequency is 22 kilo hertzs (such as, frequency be 44 kilo hertzs,
66 kilo hertzs and the signal of 88 kilo hertzs) 20 decibels (signal relative to frequency is 22 kilo hertzs) of at least decaying.Cause
This, the harmonic wave of 22 kilo hertzs of AC signals can be carried out the decay of sufficient degree by filter circuit 180.
In the above-described embodiment, when signal generating circuit 100 direct current signal to be exported, electricity can be set
Source circuit 110 exports the reference voltage signal Vref of correspondence, and arranges matrix current adjustment circuit 130 and electricity
Resistance 141～143 produces required voltage signal VH, VM and VL accordingly, and arranges current potential selection
Circuit 160 produces the switch controlling signal DM of high potential, so that voltage signal VM is sent to filtered electrical
Road 180, and it is provided that the direct current signal corresponding to voltage signal VM.In other embodiments, current potential
Selection circuit 160 can also produce required switch controlling signal DH, DM and DL respectively, with by electricity
One of them of pressure signal VH, VM and VL is sent to filter circuit 180, and is provided that required straight
Stream signal.
When signal generating circuit 100 is intended to output AC signal, can arrange voltage source circuit 110 export right
The reference voltage signal Vref answered, and matrix current adjustment circuit 130 and the corresponding real estate of resistance 141～143 are set
Voltage signal VH, VM and VL needed for life, and current potential selection circuit 160 is set alternately produces
Switch controlling signal DH and DL of high potential, to be alternately sent to filter by voltage signal VH and VL
Wave circuit 180, voltage signal VH and VL received is filtered computing by filter circuit 180, and
It is provided that the AC signal of 22 kilo hertzs.
In one embodiment, when signal generating circuit 100 direct current signal to be exported, current potential selection circuit
The 160 switch controlling signal DM that can produce high potential and switch controlling signal DH and DL of electronegative potential,
So that voltage signal VM is sent to filter circuit 180.When signal generating circuit 100 is intended to export 22 kilo hertzs
AC signal time, current potential selection circuit 160 can produce the switch controlling signal DH of alternately high potential
With the switch controlling signal DM of DL and electronegative potential, so that voltage signal VH and VL is alternately transmitted
To filter circuit 180.
Fig. 2 is the functional block diagram after an embodiment simplification of the current potential selection circuit 160 of Fig. 1.At Fig. 2
Embodiment in, current potential selection circuit 160 include AND circuit (AND gate circuit) 211～219,
Negative circuit 231～233, OR circuit (OR gate circuit) 251 and 252, with according to 22 kilo hertzs
Clock signal CLOCK, mode signal MODE, lock signal GATE and investigation mission outside the city or town signal EXTM, and
Switch controlling signal DH, DM and DL needed for generation.For making drawing simple and clear and ease of explanation, current potential
Other elements of selection circuit 160 and annexation are not illustrated in Fig. 2.
In the embodiment of fig. 2, the input of AND circuit 211 be set to receive lock signal GATE and
Investigation mission outside the city or town signal EXTM, and carry out and the computing of (AND), negative circuit 231 can be to mode signal
MODE carries out anti-phase computing.
AND circuit 212 can to the output signal of AND circuit 211 and mode signal MODE is carried out and
Computing.AND circuit 213 can be to the output letter of the output signal of AND circuit 211 and negative circuit 231
Number carry out and computing.
AND circuit 214 can to the output signal of AND circuit 212 and clock signal CLOCK is carried out and
Computing, output signal and the investigation mission outside the city or town signal EXTM of AND circuit 213 can be carried out by AND circuit 215
And computing, output signal and the mode signal MODE of AND circuit 211 can be entered by AND circuit 216
Row and computing, output signal and the lock signal GATE of negative circuit 231 can be entered by AND circuit 217
Row and computing.
OR circuit 251 can be to the output signal of AND circuit 214 and the output signal of AND circuit 215
Carrying out or the computing of (OR), OR circuit 252 can be to the output signal of AND circuit 216 and AND circuit
The output signal of 217 carry out or computing.
Negative circuit 232 can carry out anti-phase computing to the output signal of OR circuit 251.Negative circuit 233
The output signal of OR circuit 252 can be carried out anti-phase computing, to produce switch controlling signal DM.
AND circuit 218 can be by the output signal of OR circuit 252 and the output signal of negative circuit 232
Carry out and computing, and produce switch controlling signal DL.
AND circuit 219 can be by the output signal of OR circuit 251 and the output signal of negative circuit 233
And carry out and computing, and produce switch controlling signal DH.
The embodiment of Fig. 2 is only one of possible embodiment, and current potential selection circuit 160 can use respectively
Plant logic circuit, signal processing circuit, microcontroller and/or other component to implement, to produce
Switch controlling signal DH, DM and the DL needed.
Fig. 3 to Fig. 6 is several embodiments letter of switch controlling signal produced by current potential selection circuit 160
Sequential chart after change, will further illustrate the running side of current potential selection circuit 160 below with Fig. 2 to Fig. 6
Formula.
In the fig. 3 embodiment, mode signal MODE is arranged to high potential, investigation mission outside the city or town signal EXTM
It is arranged to high potential.When lock signal GATE is arranged to high potential, current potential selection circuit 160 meeting
Alternately produce switch controlling signal DH and DL of high potential, with alternately by voltage signal VH and
VL is output as voltage signal Vsqu, and filter circuit 180 can produce frequency according to voltage signal Vsqu and be
Output signal Vsin of the form of communication of 22 kilo hertzs.When lock signal GATE is arranged to electronegative potential, electricity
Position selection circuit 160 can produce the switch controlling signal DM of high potential, to be exported by voltage signal VM
For voltage signal Vsqu, filter circuit 180 can produce the defeated of DC form according to voltage signal Vsqu
Go out signal Vsin.
In the fig. 4 embodiment, mode signal MODE is arranged to high potential, lock signal GATE quilt
It is set to high potential.When investigation mission outside the city or town signal EXTM is arranged to high potential, current potential selection circuit 160 meeting
Alternately produce switch controlling signal DH and DL of high potential, with alternately by voltage signal VH and
VL is output as voltage signal Vsqu, and filter circuit 180 can produce frequency according to voltage signal Vsqu and be
Output signal Vsin of the form of communication of 22 kilo hertzs.When investigation mission outside the city or town signal EXTM is arranged to electronegative potential,
Current potential selection circuit 160 can produce the switch controlling signal DM of high potential, with by defeated for voltage signal VM
Go out and produce DC form for voltage signal Vsqu, filter circuit 180 meeting foundation voltage signal Vsqu
Output signal Vsin.
In the 5 embodiment of figure 5, mode signal MODE is arranged to electronegative potential.As lock signal GATE
When being arranged to high potential, current potential selection circuit 160 alternately can produce according to investigation mission outside the city or town signal EXTM
Switch controlling signal DH and DL of high potential, to be alternately output as electricity by voltage signal VH and VL
Pressure signal Vsqu, filter circuit 180 can produce, according to voltage signal Vsqu, the friendship that frequency is 22 kilo hertzs
Streamed output signal Vsin.When lock signal GATE is arranged to electronegative potential, current potential selection circuit
The 160 switch controlling signal DM that can produce high potential, to be output as voltage signal by voltage signal VM
Vsqu, filter circuit 180 can produce output signal Vsin of DC form according to voltage signal Vsqu.
In the embodiment in fig 6, mode signal MODE is arranged to electronegative potential, and lock signal is arranged to
High potential.When investigation mission outside the city or town signal EXTM is arranged to high potential, current potential selection circuit 160 can produce height
The switch controlling signal DH of current potential, to be output as voltage signal Vsqu by voltage signal VH.Work as investigation mission outside the city or town
When signal EXTM is arranged to electronegative potential, current potential selection circuit 160 can produce the on-off control of high potential
Signal DL, to be output as voltage signal Vsqu by voltage signal VL.Filter circuit 180 can be according to voltage
Signal Vsqu and produce output signal Vsin of the form of communication that frequency is 22 kilo hertzs or the defeated of DC form
Go out signal Vsin.
Fig. 7 is the functional block diagram after an embodiment simplification of the filter circuit 180 of Fig. 1.Filter circuit
180 include resistance 711～714, electric capacity 721～724 and amplifying circuit 731 and 732, resistance 711
With 712, electric capacity 721 and 722 and amplifying circuit 731 be a second-order low-pass filter circuit, and resistance
713 and 714, electric capacity 723 and 724 and amplifying circuit 732 be also a second-order low-pass filter circuit.Electricity
Resistance 711～714 and the resistance value of electric capacity 721～724 and amplifying circuit 731 and 732 yield value all
The adjustment that can distinguish, makes filter circuit 180 can provide the characteristics such as suitable frequency response and gain,
The harmonic wave of 22 kilo hertzs of AC signals to be carried out the decay of sufficient degree.
In the above-described embodiment, each function block all can be respectively adopted one or more component
Mode implement, and multiple function block is likely to be integrated in one or more component.Such as,
Each function block of above-described embodiment is integrated in an IC chip, and each function block is all
Can consider according to different designs and be arranged at inside and/or the outside of IC chip.
In the above-described embodiment, when signal generating circuit 100 provides direct current signal, filter circuit 180
Can also be arranged to be not filtered by voltage signal VM computing, and directly by defeated for voltage signal VM
Go out for direct current signal.
In the above-described embodiment, the comparison circuit 120 of signal generating circuit 100 can be according to voltage source electricity
Reference voltage signal Vref produced by road 110, and matrix current adjustment circuit 130 and resistance 141,142 are set
The voltage signal VM being substantially the same is produced accordingly with 143.Therefore, voltage source circuit 110 is produced
Raw low-frequency noise will not coupled to direct current signal and the AC signal that signal generating circuit 100 is exported,
And the impact that low-frequency noise is caused can be reduced.
Additionally, the current potential selection circuit 160 of signal generating circuit 100 can be according to the clock signal of 22 kilo hertzs
And produce the switch controlling signal of correspondence, so that voltage signal VH and VL is alternately sent to filter circuit
180.Therefore, internal frequency signal generating circuit or External frequency signals produce high frequency produced by circuit and make an uproar
Sound and low-frequency noise, will not coupled to direct current signal and AC signal that signal generating circuit 100 is exported,
And high-frequency noise can be reduced and impact that low-frequency noise is caused.
Some vocabulary is employed to censure specific element in specification and claims.Affiliated technology
The technical staff in field is it is to be appreciated that same element may be called with different nouns.This explanation
In the way of book and claims not difference by title is used as distinguishing element, but with element in merit
Difference on energy is used as the benchmark distinguished." comprising " mentioned in specification and claims
For open term, " comprise but be not limited to " should be construed to.It addition, " coupling " word is at this
Comprise and any directly and indirectly connect means.Therefore, if the first element is coupled to second yuan described in literary composition
Part, then represent the first element can by being electrically connected with or being wirelessly transferred, the signal connected mode such as optical delivery
And be attached directly to the second element, or the indirectly electrical or signal company by other element or connection means
It is connected to the second element.
Used herein " and/or " describing mode, comprise cited one of them or multiple project
Combination in any.It addition, unless specialized in description, the term of the most any odd number lattice is all simultaneously
Comprise the connotation of plural number lattice.
The foregoing is only embodiments herein, be not limited to the application, for this area
Technical staff for, the application can have various modifications and variations.All in spirit herein with principle
Within, any modification, equivalent substitution and improvement etc. made, claims hereof all should be included in
Within the scope of.
Claims (6)
1. digital satellite equipment control signal produces a circuit, includes:
One matrix current adjustment circuit, includes one first end, one second end and one and controls end, and this electric current adjusts
This first end of circuit is used for coupling one first preset potential, and this second end of this matrix current adjustment circuit is used for
Coupling one first end of one first resistance, one second end of this first resistance is used for being coupled to one second resistance
One first end, one second end of this second resistance is for coupling one first end of one the 3rd resistance, and this is the years old
One second end of three resistance is used for coupling one second preset potential；
One first switch, for being coupled to this second end of this matrix current adjustment circuit and being somebody's turn to do of this first resistance
First end, to receive one second voltage signal；
One second switch, for be coupled to this second end of this first resistance and this second resistance this first
End, to receive one first voltage signal；
One the 3rd switch, for be coupled to this second end of this second resistance and the 3rd resistance this first
End, to receive a tertiary voltage signal；
One comparison circuit, includes a first input end, one second input and an outfan, and this compares
This first input end of circuit is for receiving a reference voltage signal, this second input of this comparison circuit
This first end of this second end and this second resistance for coupling this first resistance, to receive this first electricity
Pressure signal, this outfan of this comparison circuit is coupled to this control end of this matrix current adjustment circuit, and this compares
Circuit is according to this reference voltage signal and this first voltage signal, and adjusts the running of this matrix current adjustment circuit；
One filter circuit, is coupled to this first switch, this second switch and the 3rd switch；And
One current potential selection circuit, is coupled to this first switch, this second switch and the 3rd switch, Yu Yi
First period was alternately turned on one of them of this first switch and the 3rd switch according to a clock signal,
So that this second voltage signal and this tertiary voltage signal are alternately sent to this filter circuit, and in one
Second period only turned on this second switch, so that this first voltage signal is sent to this filter circuit；
Wherein this second voltage signal and this tertiary voltage signal of this first period are carried out by this filter circuit
Filtering, to provide an AC signal, and provides always according to this first voltage signal of this second period
Stream signal.
2. digital satellite equipment control signal as claimed in claim 1 produces circuit, wherein this first electricity
Resistance and this second resistance have identical resistance value.
3. digital satellite equipment control signal as claimed in claim 1 or 2 produces circuit, wherein this
The resistance value of three resistance can according to this first voltage signal and this reference voltage signal at least one and become
Change.
4. a digital satellite equipment control signal production method, provides in order to arrange a signal generating circuit
Digital satellite equipment control signal, this signal generating circuit includes: a matrix current adjustment circuit, this electric current
Adjust circuit include one first end, one second end and one control end, this matrix current adjustment circuit this first
End is used for coupling one first preset potential, and this second end of this matrix current adjustment circuit is used for coupling one first electricity
One first end of resistance, one second end of this first resistance is used for being coupled to one first end of one second resistance,
One second end of this second resistance is for coupling one first end of one the 3rd resistance, and the 1 of the 3rd resistance the
Two ends are used for coupling one second preset potential；One first switch, for being coupled to this matrix current adjustment circuit
This first end of this second end and this first resistance, to receive one second voltage signal；One second switch,
This first end of this second end and this second resistance for being coupled to this first resistance, to receive one first
Voltage signal；One the 3rd switch, for being coupled to this second end of this second resistance and the 3rd resistance
This first end, to receive a tertiary voltage signal；One comparison circuit, this comparison circuit includes one first
Input, one second input and an outfan, this first input end of this comparison circuit is used for reception one
Reference voltage signal, this second input of this comparison circuit is for coupling this second end of this first resistance
And this first end of this second resistance, to receive this first voltage signal, this outfan of this comparison circuit
Be coupled to this control end of this matrix current adjustment circuit, this comparison circuit according to this reference voltage signal and this
One voltage signal, and adjust the running of this matrix current adjustment circuit；One filter circuit, is coupled to this and first opens
Close, this second switch and the 3rd switchs；And a current potential selection circuit, be coupled to this first switch,
This second switch and the 3rd switch；The method includes:
It is alternately turned on its of this first switch and the 3rd switch according to a clock signal in one first period
One of, so that this second voltage signal and this tertiary voltage signal are alternately sent to this filter circuit,
This second voltage signal and this tertiary voltage signal of this first period are filtered by this filter circuit, with
One AC signal is provided；And
This second switch is only turned on, so that this first voltage signal is sent to this filtered electrical in one second period
Lu Zhong, and this filter circuit provides a direct current signal according to this first voltage signal of this second period.
5. digital satellite equipment control signal production method as claimed in claim 4, additionally comprises:
This first resistance and this second resistance are set to have identical resistance value.
6. the digital satellite equipment control signal production method as described in claim 4 or 5, additionally comprises:
The resistance value of the 3rd resistance is set to according to this first voltage signal and this reference voltage signal extremely
Lack one of them and change.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310149315.8A CN104122805B (en) | 2013-04-26 | 2013-04-26 | Digital satellite equipment control signal produces circuit and relevant signal generating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310149315.8A CN104122805B (en) | 2013-04-26 | 2013-04-26 | Digital satellite equipment control signal produces circuit and relevant signal generating method |
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| CN104122805A CN104122805A (en) | 2014-10-29 |
| CN104122805B true CN104122805B (en) | 2016-12-28 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558244A (en) * | 2004-01-13 | 2004-12-29 | 王振铎 | Wireless telemetering system for wire loaded current |
| CN101621250A (en) * | 2008-07-01 | 2010-01-06 | 立锜科技股份有限公司 | Detecting device for output current of voltage regulator and method |
| CN101895698A (en) * | 2010-06-29 | 2010-11-24 | 苏州市华芯微电子有限公司 | Integrated circuit with functions of bias and polarization selection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI485681B (en) * | 2005-08-12 | 2015-05-21 | Semiconductor Energy Lab | Display device |
| US20080039035A1 (en) * | 2006-08-10 | 2008-02-14 | Joshua Posamentier | Antenna based listen-before-talk apparatus, system and method |
-
2013
- 2013-04-26 CN CN201310149315.8A patent/CN104122805B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1558244A (en) * | 2004-01-13 | 2004-12-29 | 王振铎 | Wireless telemetering system for wire loaded current |
| CN101621250A (en) * | 2008-07-01 | 2010-01-06 | 立锜科技股份有限公司 | Detecting device for output current of voltage regulator and method |
| CN101895698A (en) * | 2010-06-29 | 2010-11-24 | 苏州市华芯微电子有限公司 | Integrated circuit with functions of bias and polarization selection |
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| CN104122805A (en) | 2014-10-29 |
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