CN103248363A - Analog-to-digital switching circuit and analog-to-digital switching method - Google Patents
Analog-to-digital switching circuit and analog-to-digital switching method Download PDFInfo
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- CN103248363A CN103248363A CN2012100244331A CN201210024433A CN103248363A CN 103248363 A CN103248363 A CN 103248363A CN 2012100244331 A CN2012100244331 A CN 2012100244331A CN 201210024433 A CN201210024433 A CN 201210024433A CN 103248363 A CN103248363 A CN 103248363A
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Abstract
The invention discloses an analog-to-digital switching circuit and an analog-to-digital switching method. The analog-to-digital switching circuit comprises a reference circuit and an analog-to-digital converter, wherein the reference circuit with one end contacted to earth provides a fundamental voltage; the analog-to-digital converter receives an analog input signal and fundamental voltage signals; the analog-to-digital converter comprises a first direct current buffering unit and an analog-to-digital conversion core unit; the inside of the first direct current buffering unit receives an offset voltage signal and a to-be-digitized data voltage signal, so as to output two conversion control signals; the analog-to-digital conversion core unit receives the two conversion control signals of the first direct current buffering unit and an analog-to-digital conversion input range voltage signal, so as to output a digital code; and the fundamental voltage signals are added to all the offset voltage signal, the data voltage signal, and the analog-to-digital conversion input range voltage signal.
Description
Technical field
The present invention relates to a kind of analog to digital switch technology, can reduce because the transcription error that the change of technology, voltage, temperature or noise etc. is produced.
Background technology
Digitized information form is current very general mode, is beneficial to store data or data and handles.Electronic installation with video is example, and it need convert the signal of simulation to digital signal, for the processing of rear end.The analog to digital change-over circuit is obligato circuit in digitized electronic installation.
Yet, because the AD converter analog-to-digital converter (ADC) of video formula is subjected to technology (process easily, P) voltage (Voltage, V), temperature (Temperature, T) and the change of noise (noise) influence, make ADC output code (digital code) can produce deviation or error result.
Fig. 1 illustrates traditional analog to the digital conversion circuit block schematic diagram.Consult Fig. 1, with regard to the operation mechanism of analog to digital change-over circuit, it needs a reference circuit (Reference Circuit) 50 required in order to produce " operating voltages " and " operating current " to give each AD converter 100.Be example with three AD converters, it is denoted as ADC1, ADC2, ADC3.
In each AD converter 100, change vouching unit (ADC core) 118 by analog to digital conversion input range (the ADC input range) voltage signal 104 that gain unit (Gain Block) 102 causes the demand to analog to digital, to control the scope that will be digitized.
Also comprising a compensating unit (Offset Block) 108 in each AD converter 100 is connected with gain unit 102, with the voltage signal 106 of reception with another output of gain unit 102, represent with ADC_VIM and produce a compensation voltage signal, it is through the voltage stabilizing of an outside voltage stabilizing electrical equipment 110, and its magnitude of voltage is Voffset.
Each AD converter 100 also comprises strangulation voltage cell (Clamp voltage block) 112.Also input to strangulation voltage cell 112 by gain unit 102 generations to the output of compensating unit 108, to produce the strangulation voltage signal of strangulation demand.One multiplexer (MUX) 114 receives strangulation voltage signals and earthed voltage and exports a strangulation voltage Vclamp, and it is also via the voltage stabilizing of the capacitor 120 of outside.
Each AD converter 100 also receives the analog voltage signal Vin of input, it is input to inside via external capacitive 122, simultaneously by a derailing switch 124, the strangulation voltage Vclamp that will be exported by multiplexer (MUX) 114, each input signal is added a DC level, and the generation data voltage signal indicates with ADC_VIP.
Each AD converter 100 also comprises a direct current buffer cell (DC_buffer) 116, and it receives data voltage signal ADC_VIP and compensation voltage signal ADC_VIM.After the voltage signal of this ADC_VIP and ADC_VIM is input to direct current buffer cell 116, export to digital translation vouching unit 118 via direct current buffer cell 116, produce the different sizes of the analog voltage signal Vin of corresponding input again via its computing, and the digital code after the output conversion.At this, analog voltage signal Vin may be the color GTG signal of RGB (RGB) or the color signal under the color system of YPbPr.
Above-mentioned AD converter 100 is under the influence of change of technology, voltage, temperature (PVT) or noise, the operating voltage that reference circuit produces or operating current are changed by it can, and then the voltage signal of ADC_VIP and ADC_VIM and analog to digital conversion input range signal also can produce change.When if the otherness between these signals is not consistency, will produce incorrect digital code.
How improving the correctness of the digital code that digital quantizer 100 exports, is to need further research and development.
Summary of the invention
The invention provides a kind of analog to digital change-over circuit and method, can reduce because the result of the transcription error that the change of technology, voltage, temperature or noise etc. is produced.
The invention provides a kind analog to digital change-over circuit.This circuit comprises a reference circuit and an AD converter.Reference circuit provides a basic voltage, one end ground connection.AD converter receives an analog input signal and basic voltage signal.AD converter comprises one first direct current buffer cell and analog to digital conversion vouching unit.The inner data voltage signal that receives a compensation voltage signal and will be digitized of the first direct current buffer cell is to export two changeover control signals.Analog to digital conversion vouching unit receives these two changeover control signals and the analog to digital conversion input range voltage signal of the first direct current buffer cell, to export a digital code.Aforesaid compensation voltage signal, data voltage signal and analog to digital conversion input range voltage signal have the basic voltage of adding signal.
The invention provides a kind analog to digital conversion method.The method comprises utilizes a reference circuit, and a basic voltage is provided, an end ground connection of this basic voltage signal.Again this basic voltage signal is inputed to an AD converter, so that a plurality of control voltage signals of a direct current buffer cell of this AD converter inside and analog to digital conversion vouching unit all are referenced to this basic voltage, to export a turnover number character code.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 illustrates traditional analog to the digital conversion circuit block schematic diagram.
Fig. 2 illustrates according to one embodiment of the invention, analog to digital change-over circuit schematic diagram.
[main element symbol description]
50: reference circuit
100: AD converter
102: gain unit
104: analog to digital conversion input range voltage signal
106: voltage signal
108: compensating unit
110,120,122: capacitor
112: the strangulation voltage cell
114: multiplexer (MUX)
116: the direct current buffer cell
118: analog to digital conversion vouching unit
122: capacitor
124: derailing switch
200: AD converter
202: the direct current buffer cell
204,210: adder
206: compensating unit
208: gain unit
212: analog to digital conversion input range voltage signal
214: multiplexer
216: the direct current buffer cell
218: circuit box
Embodiment
The present invention proposes analog to digital change-over circuit and method, can reduce because the result of the transcription error that the change of technology, voltage, temperature or noise etc. is produced.
Below for some embodiment the present invention is described, but the present invention is not limited only to illustrated embodiment.
Fig. 2 illustrates according to one embodiment of the invention, analog to digital change-over circuit schematic diagram.Consult Fig. 2, the operating voltage, operating current and the basic voltage Vbase that are caused the demand by reference circuit 50 give each AD converter 200, for example are three and represent with ADC1-ADC3.The basic voltage Vbase that reference circuit 50 produces, one end ground connection, and for example can be through a direct current buffer cell 202 input basic voltage Vbase.That is to say that basic voltage Vbase has comprised reference circuit 50 because the caused change of various factors.
In each AD converter 200, gain unit 208 produces two voltage signals according to demand, one of them output voltage signal is used for compensation voltage signal ADC_VIM and the data voltage signal ADC_VIP of follow-up generation, and another output voltage signal is used for follow-up generation analog to digital conversion input range voltage signal 212.This compensation voltage signal ADC_VIM, data voltage signal ADC_VIP and analog to digital conversion input range voltage signal 212 all can add basic voltage Vbase, so can reduce the mistake of the turnover number character code of being exported by digital translation vouching unit 118 so that AD converter 200 and reference circuit 50 pairs of P, V, T or power supply noises etc. have more consistent variation.
Related with ground voltage and after producing basic voltage Vbase via reference circuit 50, follow-up than detailed circuit knot and the following explanation of processing mode.
At the analog to digital conversion input range voltage signal 212 of demand, the voltage signal that gain unit 208 produces obtains analog to digital conversion input range voltage signal 212 via an adder 210 with basic voltage Vbase addition.
Also comprise a compensating unit 206 in each AD converter 200, it receives a voltage signal of being exported by gain unit 208.The voltage signal that compensating unit 206 is exported is being compensated voltage signal ADC_VIM via an adder 204 with basic voltage Vbase addition.Compensation voltage signal ADC_VIM also can do voltage stabilizing via the voltage regulation capacitor 110 of outside, and the magnitude of voltage after the voltage stabilizing is Voffset.
This compensation voltage signal ADC_VIM is the input signal one of direct current buffer cell (DC_buffer) 116.
Also comprise multiplexer (MUX) 214 and direct current buffer cell 216 in each AD converter 200.Compensation voltage signal and basic voltage Vbase by adder 204 outputs are input to multiplexer 214.A strangulation voltage signal Vclamp is being exported in the output of multiplexer 214 via direct current buffer cell 216.This strangulation voltage signal Vclamp can obtain voltage stabilizing through the voltage regulation capacitor 122 with the outside, adds the data-signal of input thereafter again via a derailing switch 124, and its mechanism is as follows.
One input endpoint of each AD converter 200 can be via a capacitor 122 input analog voltage signal Vin to inner.During analog voltage signal Vin input, control switch device 124 carries out the strangulation action, and the analog voltage signal Vin of each input is added that a direct voltage is to produce data voltage signal ADC_VIP.This direct voltage is exactly the voltage of being exported by direct current buffer cell 216, and it has also comprised the change of basic voltage Vbase.
In each AD converter 200, the voltage signal of ADC_VIP and ADC_VIM is input to analog to digital conversion vouching unit 118 via direct current buffer cell 116 again, produces the numerical value of the different digital sign indicating number of corresponding different Vin sizes again via its computing.
At the above-mentioned and outside circuit box 218 that is connected, it is the source of induction external noise, yet its current potential is identical with signal ADC_VIM.As noise from power supply or ground voltage again or AD converter is outside when producing, signal ADC_VIP also can follow signal ADC_VIM and change together.
The picture signal of analog voltage signal Vin RGB, the YPbPr that can for example be or combined type picture signal (CVBS) etc. again.
According to one embodiment of the invention, under technology, voltage, temperature (P, V, T) or the influence of change of noise, the operating voltage that reference circuit 50 produces and operating current are changed by it can.And the voltage signal ADC_VIP in the AD converter 200 and ADC_VIM also can produce change.Otherness between the two is consistent, and follows basic voltage Vbase one and change.As noise from power supply or ground voltage, again or circuit is outside when producing, voltage signal ADC_VIP can follow voltage signal ADC_VIM and change together.Digital translation input range voltage signal is also followed basic voltage Vbase one simultaneously and is changed.So, the turnover number character code by digital translation vouching unit 118 exports relatively is difficult for following change, to lower wrong generation.
Analog to digital change-over circuit of the present invention makes a plurality of control voltage signals of digital translation vouching unit 116 all be referenced to the basic voltage Vbase that is produced by reference circuit, to export a turnover number character code, so lower make a mistake probability with extent of deviation of output code.
The method that the present invention just handles, it utilizes a reference circuit, and a basic voltage is provided, an end ground connection of this basic voltage signal.Again this basic voltage signal is inputed to an AD converter, so that a plurality of control voltage signals of a direct current buffer cell of this AD converter inside and analog to digital conversion vouching unit all are referenced to this basic voltage, to export a turnover number character code.
Reference circuit can be earlier through providing this basic voltage signal after the direct current buffering.
Though the present invention discloses as above with embodiment; so it is not in order to limit the present invention; those skilled in the art when doing a little change and retouching, are as the criterion so protection scope of the present invention ought be looked the appended claims person of defining without departing from the spirit and scope of the present invention.
Claims (9)
1. analog to digital change-over circuit comprises:
One reference circuit provides a basic voltage, an end ground connection of this basic voltage signal; And
One AD converter receives an analog input signal and this basic voltage signal,
Wherein this AD converter comprises:
One first direct current buffer cell, an inner data voltage signal that receives a compensation voltage signal and will be digitized is to export two changeover control signals; And
One analog to digital conversion vouching unit, receive these two changeover control signals and the analog to digital conversion input range voltage signal of this first direct current buffer cell, to export a digital code, wherein this compensation voltage signal, this data voltage signal and this analog to digital conversion input range voltage signal all add this basic voltage signal.
2. analog to digital change-over circuit as claimed in claim 1, this reference circuit wherein is earlier through one second direct current buffer cell, so that this basic voltage signal to be provided.
3. analog to digital change-over circuit as claimed in claim 1, wherein this AD converter also comprises:
One gain unit produces one first voltage signal and one second voltage signal;
One compensating unit receives this first voltage signal;
One first adder receives an output of this basic voltage signal and this compensating unit, and to export this compensation voltage signal, this compensation voltage signal inputs to this first direct current buffer cell through after the voltage stabilizing;
One multiplexer receives this compensation voltage signal and this basic voltage signal;
One second direct current buffer cell receives an output of this multiplexer, and to export a strangulation voltage, wherein this strangulation voltage signal produces this data voltage signal through being added to this analog input signal of input after the voltage stabilizing and gives this first direct current buffer cell;
One second adder receives this second voltage signal and this basic voltage signal of this gain unit, gives this analog to digital conversion vouching unit to export this analog to digital conversion input range voltage signal.
4. analog to digital change-over circuit as claimed in claim 3, wherein this reference circuit is earlier through one the 3rd direct current buffer cell, so that this basic voltage signal to be provided.
5. analog to digital change-over circuit as claimed in claim 3 also comprises a switch, in order to this strangulation voltage after the voltage stabilizing is added this analog input signal.
6. analog to digital change-over circuit as claimed in claim 3 also comprises a compensation voltage stabilizing capacitor, is connected with an end points of this AD converter, with to this compensation voltage signal voltage stabilizing.
7. analog to digital change-over circuit as claimed in claim 3 also comprises a strangulation voltage regulation capacitor, is connected with an end points of this AD converter, with to this strangulation voltage signal voltage stabilizing.
8. analog to digital conversion method comprises:
Utilize a reference circuit, a basic voltage is provided, an end ground connection of this basic voltage signal; And
This basic voltage signal is inputed to an AD converter, so that a plurality of control voltage signals of a direct current buffer cell of this AD converter inside and analog to digital conversion vouching unit all are referenced to this basic voltage, to export a turnover number character code.
9. analog to digital conversion method as claimed in claim 8 wherein provides this basic voltage signal after this reference circuit elder generation process direct current buffering.
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| CN201210024433.1A CN103248363B (en) | 2012-02-03 | 2012-02-03 | Simulation arrives digital conversion method to digital conversion circuit and simulation |
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| CN201210024433.1A CN103248363B (en) | 2012-02-03 | 2012-02-03 | Simulation arrives digital conversion method to digital conversion circuit and simulation |
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| CN103248363B CN103248363B (en) | 2016-06-08 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371552A (en) * | 1991-10-31 | 1994-12-06 | North American Philips Corporation | Clamping circuit with offset compensation for analog-to-digital converters |
| EP1251507A2 (en) * | 2001-04-17 | 2002-10-23 | Sony Corporation | Asymmetry correcting circuit and information reproducing apparatus using the same |
| TW200541223A (en) * | 2004-06-02 | 2005-12-16 | Mstar Semiconductor Inc | Video signal processing system with a dynamic adc calibration loop and related methods |
| US7116261B1 (en) * | 2005-05-09 | 2006-10-03 | Texas Instruments Incorporated | Method and apparatus for accurate inverse-linear voltage/current generator |
| CN101043215A (en) * | 2007-03-12 | 2007-09-26 | 启攀微电子（上海）有限公司 | High-performance time-digital converter circuit structure |
| TW201014339A (en) * | 2008-09-17 | 2010-04-01 | Realtek Semiconductor Corp | Method and analog front-end processing apparatus for pin-sharing |
-
2012
- 2012-02-03 CN CN201210024433.1A patent/CN103248363B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5371552A (en) * | 1991-10-31 | 1994-12-06 | North American Philips Corporation | Clamping circuit with offset compensation for analog-to-digital converters |
| EP1251507A2 (en) * | 2001-04-17 | 2002-10-23 | Sony Corporation | Asymmetry correcting circuit and information reproducing apparatus using the same |
| TW200541223A (en) * | 2004-06-02 | 2005-12-16 | Mstar Semiconductor Inc | Video signal processing system with a dynamic adc calibration loop and related methods |
| US7116261B1 (en) * | 2005-05-09 | 2006-10-03 | Texas Instruments Incorporated | Method and apparatus for accurate inverse-linear voltage/current generator |
| CN101043215A (en) * | 2007-03-12 | 2007-09-26 | 启攀微电子（上海）有限公司 | High-performance time-digital converter circuit structure |
| TW201014339A (en) * | 2008-09-17 | 2010-04-01 | Realtek Semiconductor Corp | Method and analog front-end processing apparatus for pin-sharing |
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| CN103248363B (en) | 2016-06-08 |
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