CN103491281B - Signal receiving device and electronic equipment using same - Google Patents
Signal receiving device and electronic equipment using same Download PDFInfo
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- CN103491281B CN103491281B CN201210189736.9A CN201210189736A CN103491281B CN 103491281 B CN103491281 B CN 103491281B CN 201210189736 A CN201210189736 A CN 201210189736A CN 103491281 B CN103491281 B CN 103491281B
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Abstract
Provided are a signal receiving device and a piece of electronic equipment using the same. The signal receiving device comprises a signal conversion unit, a signal analysis unit and an impedance unit. The signal conversion unit receives an analog input signal and converts the analog input signal into a digital input signal. The signal analysis unit receives the digital input signal and analyzes the signal characteristic of the digital input signal to generate an impedance adjusting signal. The impedance unit is coupled with the signal analysis unit and a signal input end of the signal receiving device. The impedance unit receives the impedance adjusting signal to dynamically adjust input impedance of the signal input end. Therefore, the signal receiving device analyzes an input signal to dynamically adjust the input impedance of the signal receiving device so as to enable the amplitude gain of the input signal to be maintained within a limited input range of the signal receiving device.
Description
Technical field
The invention relates to a kind of signal reception technology, and analyze input signal to adjust automatically in particular to a kind of
The signal receiver of whole its input impedance and include the electronic equipment of the signal receiver.
Background technology
In early stage, the signal input end of electronic equipment would generally arrange one-level signal buffer device (buffer), this signal
Buffer makes input signal in the front reasonable maintenance of the signal processing unit (e.g. process chip) into electronic equipment internal
The voltage quasi position of input signal；Or, electronic equipment can be arranged at its signal input end according to the standard specificationss of input signal
Specified input impedance.
But, electronic equipment may remove signal buffer device because of manufacturing process or change input with cost consideration now
The resistance value of impedance.When losing signal buffer device or change the resistance value of input impedance, or the signal of electronic equipment is defeated
Enter end cannot anticipated input signal amplitude by there is excessive or too small situation when, electronic equipment can only process single using signal
Gain control function in unit is clamped down on (clamping) function to correct input signal with signal, it is to avoid the distortion of input signal.
Here is illustrated to illustrate said circumstances, and Fig. 1 is the schematic diagram of general image application system 100, and e.g. image is passed
In defeated/treatment technology television signal share, or monitor monitoring ... etc. related application.The image application system 100 of Fig. 1 is
Make multiple electronic equipments 110 (example, television set) that identical input signal 130 (for example, image signal) can be obtained simultaneously, these
The signal input end 115 of electronic equipment 110 would generally be parallel with one another being electrically connected to same image signal source 120.When defeated
When entering signal 130 the too small situation of its amplitude occurring, electronic equipment 110 can pass through 140 (for example, image of signal processing unit
Process chip) in gain control function amplifying input signal, to solve the above problems.
However, the volume when the signal input end 115 of these electronic equipments 110 is parallel with one another, in each electronic equipment 110
Determining input impedance RR will make its resistance value significantly decay because of in parallel, therefore the practice having is by removing RR to avoid
Signal is attenuated, but the above-mentioned practice can cause the amplitude of input signal 130 be amplified to several times.If input signal 130
Amplitude is excessive and (assume the electricity of signal processing unit when exceeding the limited input range that signal processing unit 140 can bear
Pressure value input range, that is, the peak to peak magnitude of voltage (higher limit) of input signal can not be more than 1.5V), more than input range
(1.5V) input signal 130 will be clamped down on, and be rejected off-limits part signal.Consequently, it is possible to signal processes single
Unit 140 cannot obtain these input signals 130 being dropped in back-end processing, cause input signal 130 thus occur to lose
Very.
Therefore, how to enable electronic equipment that undistorted input is smoothly received in the case where possessing the problems referred to above
Signal, is at present in the problem solved needed for signal transmission/treatment technology.
The content of the invention
It is an object of the invention to provide a kind of signal receiver and the electronic equipment using which, to overcome known technology
Present in defect.
For achieving the above object, the signal receiver that the present invention is provided, including：
One signal conversion unit, receives a simulation input signal and is converted into a numeral input signal；One signal point
Analysis unit, couples the signal conversion unit, receives and analyze the signal characteristic of the numeral input signal to produce an impedance adjustment
Signal；And an impedance unit, a signal input end of the signal analytic unit and the signal receiver is coupled, receiving should
Impedance adjustment signal adjusts the input impedance of the signal input end with dynamic.
Described signal receiver, wherein, the signal analytic unit includes：One gain analysis module, receives the numeral
Input signal, analyzes amplitude gain of the numeral input signal relative to an acquiescence signal, to produce a digital impedance signal；With
And a digital-to-analogue conversion module, the gain analysis module is coupled, the resistance that the digital impedance signal is simulation is received and change
Anti- adjustment signal.
Described signal receiver, wherein, the impedance unit includes：One transistor, it is defeated that its first end couples the signal
Enter end, the second end of the transistor is ground connection (GND), and the control end of the transistor receives the impedance adjustment signal.
Described signal receiver, wherein, the signal conversion unit is an analog and digital signal transducer.
Described signal receiver, wherein, including：One processing unit, including one first gain control unit, should
First gain control unit receives and adjusts the gain of the numeral input signal, and the processing unit enters to the numeral input signal
Row is processed.
Described signal receiver, wherein, the signal conversion unit, the signal analytic unit and the impedance unit with
One integrated circuit is realized.
The electronic equipment that the present invention is provided, including：
One signal receiver, receives a simulation input signal from a signal source, and the simulation input signal is converted to
One numeral input signal；And
One processing unit, receives and the numeral input signal is processed, wherein, the signal receiver includes：
One signal conversion unit, receives the simulation input signal and is converted into a numeral input signal；One signal point
Analysis unit, couples the signal conversion unit, receives and analyze the signal characteristic of the numeral input signal to produce an impedance adjustment
Signal；And an impedance unit, a signal input end of the signal analytic unit and the signal receiver is coupled, receiving should
Impedance adjustment signal adjusts the input impedance of the signal input end with dynamic.
Described electronic equipment, wherein, the signal analytic unit includes：One gain analysis module, receives the numeral input
Signal, analyzes amplitude gain of the numeral input signal relative to an acquiescence signal, to produce a digital impedance signal；And one
Digital-to-analogue conversion module, couples the gain analysis module, receives and changes the impedance that the digital impedance signal is simulation and adjust
Whole signal.
Described electronic equipment, wherein, the impedance unit includes：One transistor, its first end couple the signal input end,
Second end of the transistor is ground connection (GND), and the control end of the transistor receives the impedance adjustment signal.
Described electronic equipment, wherein, also include：One electric capacity, the first end of the electric capacity couple the news of the electronic equipment
Number input, and the second end of the electric capacity couples the input of the signal conversion unit.
The present invention provide signal receiver and the electronic equipment using which, signal receiver analyze input signal with
Dynamic adjustment input impedance, makes the amplitude gain of input signal be able to maintain that in the limited input range of signal receiver.
Additionally, script is arranged at the input impedance of integrated circuit external using the transistor in integrated circuit by signal receiver
(Transistor) realizing, to reduce building the cost of electronic equipment.
Description of the drawings
Fig. 1 is the schematic diagram of general image application system.
Fig. 2 is the functional block diagram that electronic equipment is illustrated according to one embodiment of the invention.
Fig. 3 is to describe the functional block diagram of electronic equipment in detail according to one embodiment of the invention.
Primary clustering symbol description in accompanying drawing：
100 image application systems, 110 electronic equipments, the signal input end of 115,215 electronic equipments, 120 image signals
Source, 130 simulation input signals, 140 signal processing units, 210 electronic equipments, 220 signal receivers, the conversion of 222 signals are single
Unit, 224 signal analytic units, 225 numeral input signals, 226 impedance units, 227 impedance adjustment signals, 230 processing units,
240 first gain control units, 250 integrated circuits, 310 analog and digital signal transducers (ADC), 320 gain analysis modules,
325 digital impedance signals, 330 digital-to-analog signal converters (DAC), C input capacitances, RR input impedances, M metal-oxides half
Conductor field-effect transistor, GND ground connection.
Specific embodiment
The present invention proposes a kind of signal receiver, and this signal receiver includes that signal conversion unit, signal analysis are single
Unit and impedance unit.Signal conversion unit receives a simulation input signal and is converted into a numeral input signal.Signal
Analytic unit couples the signal conversion unit, and which receives and analyzes the signal characteristic of numeral input signal to produce impedance tune
Whole signal.Impedance unit couples a signal input end of the signal analytic unit and this signal receiver.Impedance unit
The impedance adjustment signal is received with the input impedance of dynamic adjustment signal input end.
In one embodiment of the invention, above-mentioned signal analytic unit includes that gain analysis module and digital simulation turn
Mold changing block.Gain analysis module receives the numeral input signal, and its described numeral input signal of analysis is relative to an acquiescence news
Number amplitude gain, to produce a digital impedance signal.Gain analysis module described in digital-to-analogue conversion module couples, its reception
And change the impedance adjustment signal that the digital impedance signal is simulation.
In one embodiment of the invention, above-mentioned impedance unit includes a transistor, and its first end is coupled to image news
The signal input end in number source.Second end of transistor is ground connection (GND), and the 3rd end of transistor receives the impedance adjustment news
Number.
In one embodiment of the invention, above-mentioned signal conversion unit, signal analytic unit and impedance unit can be with
Realized by a signal process chip.
For another viewpoint, the present invention propose a kind of electronic equipment, this electronic equipment include signal receiver and
Processing unit.Signal receiver receives a simulation input signal from a signal source, and the simulation input signal is converted to
One numeral input signal.Processing unit, receives the numeral input signal and digital input signal is processed.Wherein, institute
Stating signal receiver includes signal conversion unit, signal analytic unit and impedance unit.Signal conversion unit receives a mould
Intend input signal and be converted into a numeral input signal.Signal analytic unit couples the signal conversion unit, its reception
And the signal characteristic of numeral input signal is analyzed to produce an impedance adjustment signal.Impedance unit couples the signal analytic unit
And a signal input end of this signal receiver.It is defeated with dynamic adjustment signal that impedance unit receives the impedance adjustment signal
Enter the input impedance at end.
Described above be refer to using remaining implementation detail of the electronic equipment of signal receiver, here is not added with repeating.
Based on above-mentioned, the signal receiver described in the embodiment of the present invention can be analyzed by automatic gain control
The amplitude gain of input signal, interrogates input so as to using impedance unit come the input impedance of dynamic adjustment signal receiver
Number amplitude gain be able to maintain that in the limited input range of signal receiver.On the other hand, signal receiver is by original
Originally the input impedance of integrated circuit external is arranged at using impedance unit (for example, the metal-oxide semiconductor (MOS) in integrated circuit
Field-effect transistor) realizing, it is possible to decrease the cost of electronic equipment is built, the impedance unit can give according to practical application request
Adjusted to appropriate numerical value individually.
It is that the features described above and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing detailed
It is described as follows.
To avoid there is between signal input end of the input signal because of electronic equipment connection in series-parallel to couple relation or because electricity
Sub- equipment arranges signal buffer device or input impedance without in its signal input end, causes input signal to occur in the electronic device
Distortion, the signal receiver of the embodiment of the present invention are analyzed using automatic growth control (auto gain control) technology
Input signal, with the input impedance of signal receiver in dynamic adjustment electronic equipment, enables the amplitude gain of input signal
Maintain in the limited input range of signal receiver, so as to avoid distortion.Additionally, script is arranged at by signal receiver
The input impedance of integrated circuit external is realized using the transistor (Transistor) in integrated circuit, to reduce building electronics
The cost of equipment.
Below with the related application technology of image signal synchronous transfer/display providing an embodiment, to prove the present invention
The spirit of embodiment.However, the spirit of the embodiment of the present invention should be applied to and signal transmission technology using the present embodiment person
In related other field, will not be described here.Fig. 2 is the function side that electronic equipment 210 is illustrated according to one embodiment of the invention
Block figure.As shown in Fig. 2 electronic equipment 210 includes signal receiver 220 and processing unit 230.Signal receiver 220
From a signal source, (example, image signal source is 120) middle to receive simulation input signal 130, and signal receiver 220 will simulation
Input signal 130 is converted to numeral input signal 225.Processing unit 230 receives numeral input signal 225, and to numeral input
Signal 225 carries out image procossing/image and shows.
Due to being that, using image procossing/Display Technique as embodiment, therefore processing unit 230 can be wrapped in the present embodiment
Include the first gain control unit 240.This first gain control unit 240 can assist process unit 230, using automatic gain technology
To receive and adjust the gain of numeral input signal 225, processing unit 230 is allowed to be easier to carry out phase to digital input signal 230
The image procossing of pass.
The electronic equipment 210 of the present embodiment also includes input capacitance C, the first end coupling electronic equipment 210 of electric capacity C
Signal input end 215, and second end of electric capacity C is then couple to the input of signal conversion unit 222 in signal receiver 220
End.Thus, the noise that input capacitance C is obtained in may filter that signal input end 215, and enable simulation input signal 130 smooth
The input of signal conversion unit 222 is sent to from signal input end 215.As input electricity can't be arranged in section Example
Hold C, therefore the signal input end 215 of electronic equipment 210 is in the input that will be now equal to signal receiver 220.
Signal receiver 220 includes signal conversion unit 222, signal analytic unit 224 and impedance unit 226.News
Number converting unit 222 via input capacitance C to receive simulation input signal 130, and can be converted into a numeral input signal
225.Signal analytic unit 224 couples the outfan of signal conversion unit 222.Signal analytic unit 224 receives numeral input news
Numbers 225, and the signal analysis mechanisms having by itself are analyzing the signal characteristic of numeral input signal 225, to produce resistance
Anti- adjustment signal 227.The coupling of impedance unit 226 signal analytic unit 224 and 210/ signal receiver 220 of electronic equipment
Signal input end 215.Impedance unit 226 receives impedance adjustment signal 227 with the input resistance of dynamic adjustment signal input end 215
It is anti-.
In the present embodiment, using the present embodiment person when signal analytic unit 224 is realized, using picture processing chip
In commonly used automatic gain control function be used as the signal analysis mechanisms that signal analytic unit 224 has, with judge
The acquiescence amplitude gain difference of the signal between both of numeral input signal 225 and affiliated image standard specificationss.Thus,
When numeral input signal 225 is more than the voltage amplitude of acquiescence signal in its peak value to the voltage amplitude of peak value, represent that numeral is defeated
The amplitude gain that enters signal 225 is excessive and input impedance is too small, thus signal analytic unit just using impedance adjustment signal 227 come
Control impedance unit 226, to reduce its input impedance.On the other hand, the electricity when numeral input signal 225 in its peak value to peak value
Pressure amplitude less than acquiescence signal voltage amplitude when, the amplitude gain for representing numeral input signal 225 is too small and input impedance mistake
Greatly, therefore signal analytic unit is just using impedance adjustment signal 227 controlling impedance unit 226, to lift its input impedance.
Thus, signal receiver 220 can analyze the amplitude increasing of input signal 130 by automatic gain control
Benefit, is made defeated come dynamic adjustment signal receiver 220 and the input impedance of electronic equipment 210 so as to using impedance unit 226
The amplitude gain for entering signal 130 is able to maintain that in the limited input range of signal receiver 220 and electronic equipment 210.
Special instruction, signal conversion unit 222, signal analytic unit 224 in above-mentioned signal receiver 220,
Impedance unit 226, even processing unit 230 can be all integrated in a signal process chip (e.g. image display chip)
Realize.Consequently, it is possible to script is arranged at the input impedance of integrated circuit external using in integrated circuit by signal receiver 220
Impedance unit 226 (for example, metal oxide semiconductcor field effect transistor) realizing, it is possible to decrease build electronic equipment 210
Cost, and the circuit area of electronic equipment 210 can be reduced, the impedance unit 226 can give according to practical application request individually
Adjust to appropriate numerical value.In embodiments of the present invention all with metal oxide semiconductcor field effect transistor (Metal-Oxide-
Semiconductor Field-Effect Transistor；MOSFET) as an example illustrating embodiments thereof.However, should
Should not be limited to only use metal oxide semiconductcor field effect transistor ability attainable cost inventive embodiments with the present embodiment person
Expected effect, other kinds of transistor also can reach above-mentioned expected effect by appropriately combined mode, and the present invention is implemented
Example is not restricted to this.
Here is described in greater detail the present embodiment with Fig. 3, and Fig. 3 is set with describing electronics in detail according to one embodiment of the invention
Standby 210 functional block diagram.Signal conversion unit 222 in the embodiment of the present invention is by analog and digital signal transducer (ADC)
310 realizing.Signal analytic unit 224 includes gain analysis module 320 and digital-to-analogue conversion module (for example, digital mould
Intend signal adapter 330).Gain analysis module 320 receives numeral input signal 225, and by automatic gain analytical technology come
The acquiescence signal that numeral input signal 225 is analyzed relative to its inside is in amplitude gain between the two.In the present embodiment, increase
Beneficial analysis module 320 is just needed by this amplitude after amplitude gain of the numeral input signal 225 relative to acquiescence signal has been analyzed
Gain finding out corresponding input impedance value, to obtain optimal digital impedance signal 325.For example, gain analysis module 320 can
Corresponding digital impedance signal 325 is obtained by above-mentioned amplitude gain by a built-in gain corresponding lists.Using this
Embodiment person also can realize gain analysis module 320 using other practices, will not be described here.
Impedance unit 226 then can realize by metal oxide semiconductcor field effect transistor M that its first end is couple to
The signal input end 215 in image signal source 210, the other end of metal oxide semiconductcor field effect transistor M is ground connection (GND).
In the present embodiment, as the digital impedance signal 325 produced by gain analysis module 320 cannot directly control metal-oxide
Semiconductcor field effect transistor M, therefore signal analytic unit 224 also includes a digital-to-analogue conversion module (for example, digital simulation letter
Number transducer (DAC) 330), which is coupled to gain analysis module 320.Digital-to-analog signal converter 330 receives digital impedance news
Numbers 325, and change digital impedance signal 325 into analog form impedance adjustment signal 227.
Metal oxide semiconductcor field effect transistor M receives the impedance adjustment signal 227 of analog form, to allow metal to aoxidize
Thing semiconductcor field effect transistor M is located at triode region (or referred to as linear zone) so that metal oxide semiconductcor field effect transistor M
Two-pole characteristics allows the impedance at metal oxide semiconductcor field effect transistor M two ends can be with impedance adjustment signal similar to resistance
227 and be adjusted.Therefore, signal receiver 220 and using its electronic equipment 210 can by script be arranged at integrated circuit
Input impedance outside 250 is using 226 (for example, the metal oxide semiconductcor field effect crystal of impedance unit in integrated circuit 250
Pipe M) realizing, it is possible to decrease the cost of electronic equipment 210 is built, and reduces the circuit area of electronic equipment 210.
In sum, the signal receiver described in the embodiment of the present invention can be analyzed by automatic gain control
The amplitude gain of input signal, interrogates input so as to using impedance unit come the input impedance of dynamic adjustment signal receiver
Number amplitude gain be able to maintain that in the limited input range of signal receiver.On the other hand, signal receiver is by original
Originally the input impedance of integrated circuit external is arranged at using impedance unit (for example, the metal-oxide semiconductor (MOS) in integrated circuit
Field-effect transistor) realizing, it is possible to decrease build the cost of electronic equipment.
Although the present invention is disclosed as above with embodiment, so which is not limited to the present invention, and those skilled in the art exist
Without departing from the spirit and scope of the present invention, when can make a little change and retouching, therefore protection scope of the present invention should be with Shen
The content defined by right please is defined.
Claims (8)
1. a kind of signal receiver, including：
One signal conversion unit, receives a simulation input signal from a signal input end of the signal receiver and is converted
For a numeral input signal；
One signal analytic unit, couples the signal conversion unit, receives and analyze the signal characteristic of the numeral input signal to produce
A raw impedance adjustment signal；And
One impedance unit, couples the signal analytic unit and the signal input end, receives the impedance adjustment signal with dynamic tune
The input impedance of the whole signal input end,
Wherein, the signal analytic unit includes：
One gain analysis module, receives the numeral input signal, analyzes the numeral input signal shaking relative to an acquiescence signal
Width gain, to produce a digital impedance signal；And
One digital-to-analogue conversion module, couples the gain analysis module, receives and changes the digital impedance signal and adjust for the impedance
Whole signal, the impedance adjustment signal are analog signal.
2. signal receiver according to claim 1, wherein, the impedance unit includes：
One transistor, its first end couple the signal input end, and the second end of the transistor is to be grounded, and the control of the transistor
End receives the impedance adjustment signal.
3. signal receiver according to claim 1, wherein, the signal conversion unit is analog and digital signal conversion
Device.
4. signal receiver according to claim 1, wherein, including：
One processing unit, including one first gain control unit, first gain control unit is received and adjusts the numeral
The gain of input signal, and the processing unit processed to the numeral input signal.
5. signal receiver according to claim 1, wherein, the signal conversion unit, the signal analytic unit and
The impedance unit is realized with an integrated circuit.
6. a kind of electronic equipment, including：
One signal receiver, receives a simulation input signal from a signal source, and the simulation input signal is converted to a number
Word input signal；And
One processing unit, receives and the numeral input signal is processed,
Wherein, the signal receiver includes：
One signal conversion unit, receives the simulation input signal from a signal input end of the signal receiver and is converted
For a numeral input signal；
One signal analytic unit, couples the signal conversion unit, receives and analyze the signal characteristic of the numeral input signal to produce
A raw impedance adjustment signal；And
One impedance unit, couples the signal analytic unit and the signal input end, receives the impedance adjustment signal with dynamic tune
The input impedance of the whole signal input end,
Wherein, the signal analytic unit includes：
One gain analysis module, receives the numeral input signal, analyzes the numeral input signal shaking relative to an acquiescence signal
Width gain, to produce a digital impedance signal；And
One digital-to-analogue conversion module, couples the gain analysis module, receives and changes the digital impedance signal and adjust for the impedance
Whole signal, the impedance adjustment signal are analog signal.
7. electronic equipment according to claim 6, wherein, the impedance unit includes：
One transistor, its first end couple the signal input end, and the second end of the transistor is to be grounded, and the control of the transistor
End receives the impedance adjustment signal.
8. electronic equipment according to claim 6, wherein, also include：
One electric capacity, the first end of the electric capacity couple the signal input end of the electronic equipment, and the second end coupling of the electric capacity should
The input of signal conversion unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210189736.9A CN103491281B (en) | 2012-06-11 | 2012-06-11 | Signal receiving device and electronic equipment using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210189736.9A CN103491281B (en) | 2012-06-11 | 2012-06-11 | Signal receiving device and electronic equipment using same |
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| Publication Number | Publication Date |
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| CN103491281A CN103491281A (en) | 2014-01-01 |
| CN103491281B true CN103491281B (en) | 2017-04-12 |
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| CN201210189736.9A Expired - Fee Related CN103491281B (en) | 2012-06-11 | 2012-06-11 | Signal receiving device and electronic equipment using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109495103B (en) * | 2017-11-30 | 2020-01-24 | 成都英思嘉半导体技术有限公司 | Integrated Circuit (IC) integrating direct current isolation and application thereof |
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|---|---|---|---|---|
| JPH11317633A (en) * | 1998-04-30 | 1999-11-16 | New Japan Radio Co Ltd | Variable gain amplifier |
| JP2007074203A (en) * | 2005-09-06 | 2007-03-22 | Sony Corp | Digital video signal processor and video signal adjustment method |
| JP2008118503A (en) * | 2006-11-07 | 2008-05-22 | Seiko Epson Corp | Video signal output control circuit |
| CN101313475A (en) * | 2005-08-11 | 2008-11-26 | 比特沃半导体公司 | Programmable radio transceiver |
| US8130323B2 (en) * | 2006-08-30 | 2012-03-06 | Ati Technologies, Inc. | Closed loop DAC calibration |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3788928B2 (en) * | 2001-11-01 | 2006-06-21 | 株式会社ルネサステクノロジ | Resistance variable |
| CN101556298B (en) * | 2008-04-10 | 2011-04-13 | 中茂电子(深圳)有限公司 | Rectificative passive type load simulation device and method thereof |
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2012
- 2012-06-11 CN CN201210189736.9A patent/CN103491281B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11317633A (en) * | 1998-04-30 | 1999-11-16 | New Japan Radio Co Ltd | Variable gain amplifier |
| CN101313475A (en) * | 2005-08-11 | 2008-11-26 | 比特沃半导体公司 | Programmable radio transceiver |
| JP2007074203A (en) * | 2005-09-06 | 2007-03-22 | Sony Corp | Digital video signal processor and video signal adjustment method |
| US8130323B2 (en) * | 2006-08-30 | 2012-03-06 | Ati Technologies, Inc. | Closed loop DAC calibration |
| JP2008118503A (en) * | 2006-11-07 | 2008-05-22 | Seiko Epson Corp | Video signal output control circuit |
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| CN103491281A (en) | 2014-01-01 |
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