CN104393886B - Two-way down coversion conversion control circuit - Google Patents
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Abstract
The invention discloses a kind of two-way down coversion conversion control circuit, its external input signal end being provided with partial wave switching control in circuit and partial wave switch control logic circuit, partial wave switch control logic circuit has partial wave switch-over control signal input, the first polarized signal input and the second polarized signal input.The outfan of partial wave switch control logic circuit has four, is respectively used to control the first, second, third and fourth high frequency amplifier of partial wave switching.When the external input signal end of partial wave switching control is in a certain state, the RFin1 end of two-way low-converter as the input of V partial wave, the RFin2 end of two-way low-converter as the input of H partial wave, and when outside switch terminal is in another kind of state, the RFin1 end of two-way low-converter uses as the RFin2 end then input as V partial wave signal of the input of H partial wave, two-way low-converter.The present invention is applicable to include L word structure and the various heteroid tuner of I word structure, increases the degree of freedom of tuner tectonic sieving.
Description
Technical field
The present invention relates to the high frequency technique field of wireless communication receiver, particularly relate to the high frequency of satellite television receiver
Head technical field, especially relates to the two-way down coversion conversion control circuit of doubleway output tuner.
Background technology
It is known that the reception of satellite television is high-frequency signal satellite passed down by cubical antenna focuses on high frequency
Head feed intracavity, high frequency probe electric wave is transferred to the signal of telecommunication, in tuner after low noise amplification, use frequency demultiplier handle
Radiofrequency signal is converted to intermediate-freuqncy signal, then by cable, intermediate-freuqncy signal is sent in indoor reception machine, humorous by receiver
Adjust device and decoder that TV signal is restored, carry out rating for television set.In order to improve propagation efficiency, the high frequency that satellite passes down
Signal mostly is compound partial wave signal.Such as, the signal that the Astra satellite in Europe passes down is horizontal linear partial wave and vertical line
The composite signal of partial wave, the signal that the Echostar satellite of the U.S. passes down is then the compound of left-handed round partial wave and dextrorotation circle partial wave
Signal.These compound partial wave signals contain different television channels and TV programme.Each receiver then needs
Guarantee to receive all programs of all of television channel.So, the feed intracavity of tuner needs to arrange at diverse location
Two high frequency probes are respectively intended to receive two kinds of different partial wave signals.By the two probe, high-frequency signal is introduced to high frequency
On circuit board in Tou, two different low-noise amplifiers respectively different partial wave signals is amplified, defeated after superposition
Enter, to low-converter, high-frequency signal is transformed to intermediate-freuqncy signal.In order to avoid different biased signals interferes with each other, in tuner
Two different low-noise amplifiers are exclusiveness actions.Their action be by be applied on tuner outfan by connecing
The polarization controlled signal that receipts machine is sent here controls.As a example by Astra satellite television receiver, receiver is passed by tuner in reception
While the intermediate-freuqncy signal sent here, receiver then passes to polarizing control voltage signal in tuner by same cable, as
Really polarizing voltage is 13 volts, then the amplifier regular event of vertical partial wave, and the amplifier of horizontal partial wave is in cut-off state；And
If polarizing voltage is 18 volts, then the amplifier of vertical partial wave is in cut-off state, the amplifier regular event of horizontal partial wave.
, the tuner of single channel output can only be controlled by a receiver.
In order to solve such problem, utility model patent CN203104639U and CN203279017U all discloses two-way
The technology of output high frequency tuner.Such two channel high frequency head can independently be controlled by two receivers to receive.But not only circuit is multiple
Miscellaneous, the switching of partial wave relates to the power divider of microwave and action can control the matching problem of amplifier and isolation reduces
Problem, cause the difficulty of manufacturer's R & D design.In order to solve this problem, CN103516374A application for a patent for invention is public
Open the low-converter integrated circuit of a kind of doubleway output to realize the technology of doubleway output tuner.This integrated circuit except
It is integrated with outside two-way low-converter and frequency range, polarization partial wave control circuit, is also integrated with four radio frequencies for partial wave switching and puts
Big device, efficiently solves the problem that the R & D design of doubleway output tuner is difficult.But, from CN103516374A patent of invention
It can be seen that control the defeated of the polarisation voltage detector of the partial wave input of the low-converter on each road in the disclosed description of application
Do well and directly control the operating state of four radio frequency amplifiers that partial wave switches.As shown in Figure 4, sound/polarizing voltage list
Unit 17 controls amplifier 123 and amplifier 125, and sound/polarizing voltage unit 27 then controls amplifier 124 and amplifier 126
Operating state.When the input polarizing voltage of sound/polarizing voltage unit 17 is 13 volts, illustrate that the receptor receiving OUT1 is wanted
What Qiu Ci road low-converter received is vertical partial wave signal, so amplifier 123 is operating normally, amplifier 125 is then in cut-off
State.Otherwise, when the input polarizing voltage of sound/polarizing voltage unit 17 is 18 volts, this receptor is required of horizontal partial wave
Signal, then, amplifier 123 ends, and receptor 125 is then operating normally.As a same reason, amplifier 124 and receptor 126 is dynamic
Making state is then to be controlled by sound/polarizing voltage unit 27.It is to say, disclosed in CN103516374A application for a patent for invention
The partial wave signal that the rf inputs of doubleway output integrated circuit and feed intracavity high frequency probe are received is one to one.
The input 161 of RFin1 is fixed as vertical partial wave signal input part, is namely marked in this patent application specification accompanying drawing
Bright V signal input；Similarly, the input 162 of RFin2 is fixed as horizontal partial wave signal input part, namely should
The H signal input indicated in patent application specification accompanying drawing.This has the doubleway output collection of fixing partial wave input
Become circuit can suffer a problem that in reality application.That is exactly that same such doubleway output integrated circuit, at certain height
Frequently the structure of head framework is lower cannot be able to use because of the intersection of radiofrequency signal.Below by schematic diagram, this problem is described.
Fig. 2 is a kind of doubleway output tuner applying integrated circuit disclosed in CN103516374A application for a patent for invention
Structural map.40 is feed chamber, and 41 are used to reprint amplifier and the framework of down-converter circuit plate.The configuration direction of circuit board with
The direction in feed chamber is vertical, and this kind of tuner is the tuner of the L word structure often having.Wherein, 400 is the spy of vertical (V) partial wave
Needle adapter, 401 is the probe joint of level (H) partial wave, and 411,412,413,414 are respectively CN103516374A patent of invention Shen
31,32,33,34 4 low-noise amplifiers in circuit diagram disclosed in please, 411 and 412 signals being responsible for V partial wave amplify, and 413
It is amplified with 414 pairs of H partial wave signals.Then, vertical partial wave signal is input to vertical (V) of integrated circuit through transmission line 420
Partial wave input RFin1, horizontal partial wave signal is input to level (H) the partial wave input of integrated circuit through transmission line 421
RFin2, after doubleway output integrated circuit is transformed to intermediate-freuqncy signal, is respectively outputted to first via medium frequency output end 430 and
Two road medium frequency output ends 431.On circuit board, the configuration of device is reasonable, and high-frequency signal transmission wire does not intersect.
But, for the tuner of I glyph construction as shown in Figure 3, because the low noise of vertical partial wave signal is put
Big device 411 and 412 must be arranged near vertical partial wave probe, so amplifier 411 and 412 need are configured to horizontal partial wave and put
The left side of big device 413 and 414.So, because the vertical partial wave input of chip IC is on the right, it is the formation of vertical partial wave signal
Transmission line and the intersection of horizontal partial wave signal transmssion line.In actual tuner manufactures, in order to reduce manufacturing cost, circuit board
Generally using two-sided high-frequency circuit board, surface is mounted with various components and parts and is configured with radio-frequency transmission line, the back side then needs big face
Long-pending ground connection does not cause the big loss of signal with the transmission line ensureing surface.So, in this case, CN103516374A invents
The application of the integrated circuit of patent application publication is then not suitable for.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, it is an object of the invention to provide and a kind of go for various structure
The two-way down coversion conversion control circuit of doubleway output tuner.
To achieve these goals, the present invention adopts the following technical scheme that
Two-way down coversion conversion control circuit, including amplifying unit, the first down coversion change-over circuit, the second down coversion conversion
Circuit, partial wave switch control logic circuit, the first partial wave control signal detector and the second partial wave control signal detector, its
In:
Amplifying unit includes the first amplifier and the second amplifier, and the input of the first amplifier connects the first partial wave signal
Input, outfan are connected to the input of the first down coversion change-over circuit；The input of the second amplifier connects the second partial wave
Signal input part, outfan are connected to the input of the second down coversion change-over circuit；
First down coversion change-over circuit includes the first high frequency amplifier, the second high frequency amplifier, the first frequency mixer, first
Ground agitator, first vibration frequency control signal detector and the first intermediate frequency amplifier；Second down coversion change-over circuit includes
Three high frequency amplifiers, the 4th high frequency amplifier, the second frequency mixer, the second local oscillator, the second local frequency control signal inspection
Survey device and the second intermediate frequency amplifier；
The input of first, second high frequency amplifier is respectively connecting to the outfan of the first amplifier, the three, the 4th high frequencies
The input of amplifier is respectively connecting to the outfan of the second amplifier, and the outfan of the first, the 3rd high frequency amplifier connects jointly
Being connected to the input of the first frequency mixer, the outfan of the second, the 4th high frequency amplifier is commonly connected to the input of the second frequency mixer
End, four outfans of partial wave switch control logic circuit are respectively connecting to first, second, third, fourth high frequency amplifier
Operating state controls end, under the control of partial wave switch control logic circuit, the first high frequency amplifier and the 3rd high frequency amplifier
Being exclusiveness action, say, that when the first high frequency amplifier is in regular event state, the 3rd high frequency amplifier must be
It is in cut-off state；And the 3rd high frequency amplifier is when being in regular event state, the first high frequency amplifier is necessarily in cut-off
State；Similarly, the second high frequency amplifier and the 4th high frequency amplifier are also exclusiveness actions；First, second frequency mixer
Outfan be respectively connecting to the input of first, second intermediate frequency amplifier, the outfan of the first intermediate frequency amplifier connects first
Road intermediate-freuqncy signal outfan, the outfan of the second intermediate frequency amplifier connects the second tunnel intermediate-freuqncy signal outfan；First, second local oscillator
The input of frequency control signal detector connects the compound input of first, second audio signal and polarized signal respectively, the
One, the outfan of the second local frequency control signal detector connects the input of first, second local oscillator respectively, the
One, the outfan of the second local oscillator connects the local oscillation signal input of first, second frequency mixer respectively；
The input of first, second partial wave control signal detector connects first, second audio signal and polarization letter respectively
Number compound input, the outfan of first, second partial wave control signal detector is connected respectively to partial wave switching control
First, second polarized signal input of logic circuit, the partial wave switch-over control signal input of partial wave switch control logic circuit
End connects the external input signal end of partial wave switching control.
After using such scheme, the two-way down coversion conversion control circuit of the present invention, a partial wave is set in circuit and cuts
Change the external input signal end of control, and a partial wave switch control logic circuit is set, this partial wave switch control logic electricity
The input on road has three, is partial wave switch-over control signal input, the first polarized signal input and the second polarization letter respectively
Number input.And the outfan of this partial wave switch control logic circuit has four, be respectively used to control partial wave switching first,
Second, third and the 4th high frequency amplifier.When the external input signal end of partial wave switching control is in a certain state, under two-way
The RFin1 end of converter as the input of V partial wave, the RFin2 end of two-way low-converter is as the input of H partial wave, and work as
When outside switch terminal is in another kind of state, the RFin1 end of two-way low-converter is as the input of H partial wave, two-way down coversion
The RFin2 end of device then input as V partial wave signal uses.Compared with prior art, the invention has the beneficial effects as follows: be suitable for
In including L word structure and the various heteroid tuner of I word structure, increase the degree of freedom of tuner tectonic sieving.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the two-way down coversion conversion control circuit of the present invention；
Fig. 2 is the organigram of the doubleway output tuner applying doubleway output integrated circuit in prior art；
Fig. 3 is that the structure of the doubleway output tuner that in prior art, doubleway output integrated circuit can not be applied normally shows
It is intended to.
Fig. 4 is the structural map of the tuner of two-way intermediate frequency output disclosed in CN103516374A application for a patent for invention.
Detailed description of the invention
The present invention is further described below in conjunction with the accompanying drawings.
The structure of the doubleway output down coversion conversion control circuit of the present invention as it is shown in figure 1, include amplifying unit, first time
Down-conversion circuitry, the second down coversion change-over circuit, partial wave switch control logic circuit the 81, first partial wave control signal detector
641 and the second partial wave control signal detector 741, wherein:
Amplifying unit includes the first amplifier 601 and the second amplifier 701, and the input of the first amplifier 601 connects the
One partial wave signal input part 600, outfan are connected to the input of the first down coversion change-over circuit；Second amplifier 701 defeated
Enter to hold connection the second partial wave signal input part 700, outfan to be connected to the input of the second down coversion change-over circuit；
First down coversion change-over circuit includes first high frequency amplifier the 602, second high frequency amplifier the 603, first frequency mixer
610, the first local oscillator 630, first vibration frequency control signal detector 640 and the first intermediate frequency amplifier 620；Second time
Down-conversion circuitry includes that the 3rd high frequency amplifier the 702, the 4th high frequency amplifier the 703, second frequency mixer 710, second this locality shakes
Swing device the 730, second local frequency control signal detector 740 and the second intermediate frequency amplifier 720；
The input of first, second high frequency amplifier 602,603 is respectively connecting to the outfan of the first amplifier 601, the
Three, the input of the 4th high frequency amplifier 702,703 is respectively connecting to the outfan of the second amplifier 701, the first, the 3rd high frequency
The outfan of amplifier 602,702 is commonly connected to the input of the first frequency mixer 610, the second, the 4th high frequency amplifier 603,
The outfan of 703 is commonly connected to the input of the second frequency mixer 710, and the outfan of first, second frequency mixer 610,710 is respectively
Being connected to the input of first, second intermediate frequency amplifier 620,720, the outfan of the first intermediate frequency amplifier 620 connects the first via
Intermediate-freuqncy signal outfan 621, the outfan of the second intermediate frequency amplifier 720 connects the second tunnel intermediate-freuqncy signal outfan 721；The first,
The input of the second local frequency control signal detector 640,740 connects first, second audio signal and polarized signal respectively
Compound input 642,742, the outfan of first, second local frequency control signal detector 640,740 connects respectively
One, the input of the second local oscillator 630,730, the outfan of first, second local oscillator 630,730 connects respectively
One, the local oscillation signal input of the second frequency mixer 610,710；
The input of first, second partial wave control signal detector 641,741 connect respectively first, second audio signal and
The compound input 642,742 of polarized signal, the outfan of first, second partial wave control signal detector 641,741 is the most right
Should be connected to first, second polarized signal input 811,812 of partial wave switch control logic circuit 81, partial wave switching control is patrolled
The partial wave switch-over control signal input 810 collecting circuit 81 connects the external input signal end 80 of partial wave switching control.
First, second partial wave signal input part 600 is respectively intended to 700 input the high-frequency signal that two-way is different.This two-way
After high-frequency signal amplifies respectively through first, second normally opened amplifier 601 and 701, the signal on each road is respectively divided into two
Road, print is added to the input of first, second switchable high frequency amplifier 602,603 and the three, the 4th high frequency amplifier 702,703
End, the output of the 3rd high frequency amplifier 702 and the output of the first high frequency amplifier 602 combine, the second high frequency amplifier 603 defeated
Go out the output with the 4th high frequency amplifier 703 to combine.First high frequency amplifier 602 and the 3rd high frequency amplifier 702 are exclusiveness
Action, say, that when the first high frequency amplifier 602 is in regular event state, the 3rd high frequency amplifier 702 must be place
In cut-off state；And the 3rd high frequency amplifier 702 is when being in regular event state, the first high frequency amplifier 602 is necessarily in
Cut-off state.Similarly, the second high frequency amplifier 603 and the 4th high frequency amplifier 703 are also exclusiveness actions.These four
The operating state of switchable high frequency amplifier be respectively by four outfans 814 of partial wave switch control logic circuit 81,
813,815,816 control.So, 4 switchable high frequency amplifiers define two-way high frequency output signal, and print is added to respectively
The input of first, second frequency mixer 610 and 710.After first, second frequency mixer 610 and 710 frequency reducing, signal becomes intermediate frequency
Signal, amplifies respectively through first, second intermediate frequency amplifier 620 and 720 again, is then passed through first, second road medium frequency output end
621 and 721 outputs.It addition, first, second down coversion change-over circuit is respectively equipped with selectable first, second an of frequency range
Ground agitator 630,730, respectively first, second frequency mixer 610,710 provides local oscillated signal.The doubleway output of the present invention
Down coversion conversion control circuit is except being provided with first, second above-mentioned partial wave signal input part 600,700, in first, second tunnel
Frequently, outside outfan 621,721, it is additionally provided with the compound input 642,742 of first, second audio signal and polarized signal, uses respectively
High-frequency signal object in the local oscillator frequency range and down coversion controlling first, second low-converter change-over circuit.For defending
During the application of the general tuner of star radiotelevisor, audio frequency and polarization controlled signal are changed in the doubleway output down coversion of the present invention
Examine through first, second local frequency control signal detector 640,740 and first, second partial wave control signal in control circuit
Survey 641,741 pairs of audio frequency 22KHz signals of device with or without and after the size (13V or 18V) of polarizing voltage detects, first, the
The frequency range of two local frequency control signal detector 640,740 output first, second local oscillators 630,730 controls numeral letter
Number, first, second partial wave control signal detector 641,741 then exports the digital signal controlling high-frequency signal passage.The most just
Being to say, the frequency range of the first local oscillator 630 is controlled by the output signal of first vibration frequency control signal detector 640；The
The frequency range of two local oscillators 730 is controlled by the output signal of the second local frequency control signal detector 740.The present invention's is double
The maximum feature of road output down coversion conversion control circuit then, first, second partial wave control signal detector 641,741 defeated
Go out digital signal be not be directly used in control switchable first, second, third, fourth high frequency amplifier 602,603,702,
703, but originally made by such as table 1(by the input signal of the external input signal end 80 of the partial wave switching control arranged especially
Partial wave switch logic truth table with novel doubleway output down coversion conversion control circuit) shown in specific logical operations
After, 4 first, second, third, fourth switchable high frequency amplifiers 602,603,702,70 are controlled by output digit signals
System.
Table 1
The signal inputted through the external input signal end 80 of partial wave switching control is digital signal, can have various states,
Such as ground connection, connect power supply or open circuit etc..Two of which state is input to partial wave switch-over control signal input 810 for
One, each road polarization controlled signal of the second polarized signal input 811,812 input carries out logical operations.If saying, first
The state 1 of polarized signal input 811 represents the pole inputted from the compound input 642 of the first audio signal and polarized signal
Changing and controlling voltage is 13V, and it is 18V that state 2 represents its polarizing control voltage, state 1 generation of the second polarized signal input 812
The polarizing control voltage of compound input 742 input that table the second audio signal and polarized signal is 13V, and state 2 represents
Its polarizing control voltage is 18V, then, as it can be seen from table 1 when partial wave switch-over control signal input 810 is state 1；The
One polarized signal input 811 is required to export vertical partial wave signal for state 1(the first down coversion change-over circuit)；Second polarization
Signal input part 812 is required to export vertical partial wave signal for state 1(the second down coversion change-over circuit) time, first, second is high
Audio amplifier 602 and 603 is operating normally, the three, the 4th high frequency amplifiers 702 and 703 cut-offs.In turn, switch when partial wave
Control signal input 810 is state 2；First polarized signal input 811 is that state 1(the first down coversion change-over circuit is wanted
Seek the vertical partial wave signal of output)；Second polarized signal input 812 is required output for state 1(the second down coversion change-over circuit
Vertical partial wave signal) time, the three, the 4th high frequency amplifier 702 and 703 regular events, first, second high frequency amplifier 602 He
603 cut-offs.It is to say, the second partial wave signal input part 700 must be vertical partial wave signal input part and the first partial wave letter
Number input 600 must be then horizontal partial wave input.For other states in table 1, it is also possible to make similar description.Also
That is, the two-way down coversion conversion control circuit of the present invention, by setting the external input signal end 80 of partial wave switching control
State, the first partial wave signal input part 600 can be set as vertical partial wave input, the second partial wave signal input part 700
For horizontal partial wave signal input part, it is also possible to the first partial wave signal input part 600 is set as horizontal partial wave input, second inclined
Ripple signal input part 700 is vertical partial wave signal input part.
So, when the situation as shown in Fig. 3 occurs, designer is external input signal end 80 state of partial wave switching control
Change the intersection that the most just can avoid high-frequency signal transmission wire.It is to say, the two-way down coversion conversion and control electricity of the present invention
Road is applicable to the doubleway output tuner of arbitrary shape, and its tectonic sieving is not configured by the high frequency input terminal of internal integrated circuit
Restriction.Then, the degree of freedom of tuner tectonic sieving is expanded, for manufacturing and designing manufacturer simultaneously for tuner,
Diversified doubleway output tuner can be produced with relatively low Cost Design.
It should be noted that partial wave mentioned above is to be illustrated as a example by straight line partial wave, change round partial wave signal into
If, then as long as vertical partial wave and horizontal partial wave are transformed to left-handed round partial wave and dextrorotation circle partial wave.Operating principle is one
Sample.Further, the polarizing control voltage mentioned in this specification is 13V or 18V, this numerical value right model without limitation itself
The key element enclosed, as long as meet all application of the intention of the present invention, broadly falls in the interest field of patent of the present invention.
Claims (1)
1. two-way down coversion conversion control circuit, it is characterised in that include amplifying unit, the first down coversion change-over circuit, second
Down coversion change-over circuit, partial wave switch control logic circuit, the first partial wave control signal detector and the second partial wave control signal
Detector, wherein:
Amplifying unit includes the first amplifier and the second amplifier, and the input of the first amplifier connects the first partial wave signal input
End, outfan are connected to the input of the first down coversion change-over circuit；The input of the second amplifier connects the second partial wave signal
Input, outfan are connected to the input of the second down coversion change-over circuit；
First down coversion change-over circuit includes that the first high frequency amplifier, the second high frequency amplifier, the first frequency mixer, first this locality shake
Swing device, first vibration frequency control signal detector and the first intermediate frequency amplifier；Second down coversion change-over circuit includes three-hypers
Audio amplifier, the 4th high frequency amplifier, the second frequency mixer, the second local oscillator, the second local frequency control signal detector
With the second intermediate frequency amplifier；
The input of first, second high frequency amplifier is respectively connecting to the outfan of the first amplifier, the three, the 4th High frequency amplifications
The input of device is respectively connecting to the outfan of the second amplifier, and the outfan of the first, the 3rd high frequency amplifier is commonly connected to
The input of the first frequency mixer, the outfan of the second, the 4th high frequency amplifier is commonly connected to the input of the second frequency mixer, partially
Four outfans of ripple switch control logic circuit are respectively connecting to the action shape of first, second, third, fourth high frequency amplifier
State controls end, and under the control of partial wave switch control logic circuit, the first high frequency amplifier and the 3rd high frequency amplifier are exclusive
Sexual act, say, that when the first high frequency amplifier is in regular event state, the 3rd high frequency amplifier is necessarily in cutting
Only state；And the 3rd high frequency amplifier is when being in regular event state, the first high frequency amplifier is necessarily in cut-off state；
Similarly, the second high frequency amplifier and the 4th high frequency amplifier are also exclusiveness actions；The outfan of first, second frequency mixer
Being respectively connecting to the input of first, second intermediate frequency amplifier, the outfan of the first intermediate frequency amplifier connects first via intermediate frequency letter
Number outfan, the outfan of the second intermediate frequency amplifier connects the second tunnel intermediate-freuqncy signal outfan；First, second local frequency controls
The input of signal detector connects the compound input of first, second audio signal and polarized signal respectively, first, second
The outfan of vibration frequency control signal detector connects the input of first, second local oscillator respectively, and first, second is local
The outfan of agitator connects the local oscillation signal input of first, second frequency mixer respectively；
The input of first, second partial wave control signal detector connects first, second audio signal and polarized signal respectively
Compound input, the outfan of first, second partial wave control signal detector is connected respectively to partial wave switch control logic
First, second polarized signal input of circuit, the partial wave switch-over control signal input of partial wave switch control logic circuit is even
Connect the external input signal end of partial wave switching control.
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| CN201410689589.0A CN104393886B (en) | 2014-11-26 | 2014-11-26 | Two-way down coversion conversion control circuit |
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| CN201410689589.0A CN104393886B (en) | 2014-11-26 | 2014-11-26 | Two-way down coversion conversion control circuit |
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| CN104393886B true CN104393886B (en) | 2016-11-30 |
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| JP2013258622A (en) * | 2012-06-14 | 2013-12-26 | Renesas Electronics Corp | Down converter and control method of the same |
| JP2014103625A (en) * | 2012-11-22 | 2014-06-05 | Renesas Electronics Corp | Down converter |
| CN204272096U (en) * | 2014-11-26 | 2015-04-15 | 厦门科塔电子有限公司 | Two-way frequency down-converts control circuit |
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Denomination of invention: Dual channel down conversion control circuit Granted publication date: 20161130 Pledgee: Agricultural Bank of China Limited Xiamen Lianqian Branch Pledgor: XIAMEN KTD ELECTRONICS CO.,LTD. Registration number: Y2024980036913 |