CN104345760B - Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source - Google Patents
Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source Download PDFInfo
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Abstract
A kind of adjust the current correction circuit of the input of electric current produced by current source, current correction method and ramp generator.The present invention provides a kind of in order to adjust the current correction circuit of electric current input produced by current source, and this current correction circuit comprises process function block and adjusts function block.This process function block is coupled to this current source, in order to receive preset reference voltage input and the input of this electric current, and produces result according to the input of this preset reference voltage with the input of this electric current.This adjustment function block is coupled to this process function block and this current source, in order to produce to adjust signal to this current source to adjust the input of this electric current according to this result, so that there is predetermined ratio between the size of the size of this electric current input and the input of this preset reference voltage.
Description
Technical field
The present invention relates to current correction, particularly relate to a kind of in order to adjust the current correction circuit of electric current input produced by current source, and its relevant current correction method and ramp generator.
Background technology
The oblique wave linearity (ramplinearity) of ramp generator (rampgenerator) and the accuracy of ramp slopes (rampslope) can by providing stable current source to promote.Owing to band gap reference voltage (bandgapreferencevoltage) can provide stable voltage source, therefore by resistance element, band gap reference voltage can be converted to required electric current, but, the resistance value of resistance element still can produce change slightly, cause and also change to some extent according to electric current produced by band gap reference voltage, and then affect the performance of ramp generator.
Make current source stably provide the design mechanism that electric current inputs accordingly, it would be desirable to a kind of, solve the problems referred to above.
Summary of the invention
In view of this, an object of the present invention is in that to provide a kind of in order to adjust the current correction circuit of electric current input produced by current source, and its relevant current correction method and ramp generator, solves the problems referred to above.
According to one embodiment of the invention, it discloses a kind of in order to adjust the current correction circuit of electric current input produced by current source.This current correction circuit comprises process function block and adjusts function block.This process function block is coupled to this current source, in order to receive preset reference voltage input and the input of this electric current, and produces result according to the input of this preset reference voltage with the input of this electric current.This adjustment function block is coupled to this process function block and this current source, in order to produce to adjust signal to this current source to adjust the input of this electric current according to this result, so that there is predetermined ratio between the size of the size of this electric current input and the input of this preset reference voltage, wherein said process function block comprises: control unit, in order to produce multiple switch controlling signal, wherein said multiple switch controlling signals include at least the first switch controlling signal and second switch control signal；Core cell；First electric capacity, it is coupled between described core cell and the first specific endpoints, wherein said core cell carries out processing to store output result to described first electric capacity for the input of described electric current and the input of described preset reference voltage, then adjusts described output result so that described first electric capacity stores described result；First switching switch, in order to optionally described first specific endpoints to be coupled to reference voltage end according to described first switch controlling signal；And second switching switch, in order to optionally described first specific endpoints to be coupled to described adjustment function block according to described second switch control signal.
According to another embodiment of the present invention, it separately discloses a kind of current correction method for above-mentioned current correction circuit.Current correction method comprises the steps of and produces result according to preset reference voltage input with the input of this electric current；And produce to adjust signal to this current source to adjust the input of this electric current according to this result, so that there is predetermined ratio between the size of the size of this electric current input and the input of this preset reference voltage.
According to another embodiment of the present invention, it separately discloses a kind of ramp generator.This ramp generator comprises current source, current correction circuit and ramp generating circuit.This current source is in order to produce electric current input.This current correction circuit is in order to adjust this electric current input produced by this current source.This ramp generating circuit is coupled to this current source, in order to produce ramp signal according to via this electric current input after this current correction circuit adjustment.This current correction circuit comprises process function block and adjusts function block.This process function block is coupled to this current source, in order to receive preset reference voltage input and the input of this electric current, and produces result according to the input of this preset reference voltage with the input of this electric current.This adjustment function block is coupled to this process function block and this current source, in order to produce to adjust signal to this current source to adjust the input of this electric current according to this result, so that there is predetermined ratio between the size of the size of this electric current input and the input of this preset reference voltage, wherein said process function block comprises: control unit, in order to produce multiple switch controlling signal, wherein said multiple switch controlling signals include at least the first switch controlling signal and second switch control signal；Core cell；First electric capacity, it is coupled between described core cell and the first specific endpoints, wherein said core cell carries out processing to store output result to described first electric capacity for the input of described electric current and the input of described preset reference voltage, then adjusts described output result so that described first electric capacity stores described result；First switching switch, in order to optionally described first specific endpoints to be coupled to reference voltage end according to described first switch controlling signal；And second switching switch, in order to optionally described first specific endpoints to be coupled to described adjustment function block according to described second switch control signal.
Disclosed current correction circuit can input (such as according to preset reference voltage, band gap reference voltage) adjust electric current input, and then the impact that electric current is inputted by the variation reducing/prevent resistance element, therefore can the performance (such as, the oblique wave linearity or ramp slopes) of lifting inclined baud generator.
Accompanying drawing explanation
Fig. 1 is the function block schematic diagram of the embodiment of the current correction circuit of broad sense of the present invention.
Fig. 2 is that the present invention is in order to adjust the schematic diagram of the embodiment of the current correction circuit of electric current input produced by current source.
Fig. 3 is the signal timing diagram of the implementation example of the multiple switch controlling signals for controlling the multiple switching switches shown in Fig. 2.
Fig. 4 is that the present invention is in order to adjust the schematic diagram of another embodiment of the current correction circuit of electric current input produced by current source.
Fig. 5 is the signal timing diagram of the implementation example of the multiple switch controlling signals for controlling the multiple switching switches shown in Fig. 4.
Fig. 6 is the function block schematic diagram of the embodiment of ramp generator of the present invention.
Detailed description of the invention
Refer to the function block schematic diagram of the embodiment of the current correction circuit that Fig. 1, Fig. 1 are broad sense of the present invention.Current correction circuit 100 is in order to adjust electric current input I_IN produced by current source CR, and it comprises process function block 110 and adjusts function block 120.As shown in Figure 1, process function block 110 and be coupled to current source CR, in order to receive preset reference voltage input V_IN and electric current input I_IN, and produce result PR according to preset reference voltage input V_IN with electric current input I_IN.Adjust function block 120 and be coupled to process function block 110 and current source CR, in order to produce to adjust signal S_A to current source CR to adjust electric current input I_IN according to result PR, so that there is predetermined ratio between the size of the size of electric current input I_IN and preset reference voltage input V_IN.In implementation example, preset reference voltage input V_IN can be band gap reference voltage.
For example (but the invention is not limited in this), the electric current input I_IN that can be intended to adjust is converted to voltage signal, and be compared to produce result PR (such as with this voltage signal to preset reference voltage input V_IN, voltage difference between the two), next, adjust function block 120 to produce to adjust signal S_A (such as, voltage signal or current signal) to current source CR to adjust electric current input I_IN according to result PR.In implementation example, the magnitude of voltage of the electric current input this voltage signal corresponding to I_IN finally can be adjusted to that the magnitude of voltage inputting V_IN equal to preset reference voltage.In another implementation example, the current mirror branch (currentmirrorbranch) that can pass through to be transferred to adjustment signal S_A (such as, voltage signal or current signal) current source CR adjusts electric current input I_IN.Please note, more than it is intended for needing of explanation, not it is used for the restriction as the present invention, that is, as long as adopt, preset reference voltage is inputted (such as, band gap reference voltage) carry out processing to produce result with the electric current input being intended to adjust, and then produce to adjust signal to this current source to adjust the input of this electric current according to this result, so that the electric current input after adjusting maintains stable current value (such as, this electric current input size and this preset reference voltage input size between there is predetermined ratio) current correction mechanism, all follow the spirit of the present invention.Details are as follows for further instruction.
Referring to Fig. 2, Fig. 2 is that the present invention is in order to adjust the schematic diagram of the embodiment of the current correction circuit of electric current input I_IN produced by current source CR.Current correction circuit 200 comprises process function block 210 and adjusts function block 220, wherein the process function block 110 shown in Fig. 1 can adopt process function block 210 to carry out implementation and go out, and the adjustment function block 120 shown in Fig. 1 can adopt adjustment function block 220 to carry out implementation to go out.Process function block 210 and comprise control unit 212, core cell the 214, first electric capacity C1, the first switching switch SW1 and second switching switch SW2.First electric capacity C1 is coupled between core cell 214 and the first specific endpoints N1, wherein core cell 214 inputs I_IN and preset reference voltage V_IN input for electric current and carries out processing store output result R_O to first electric capacity C1, then adjusts output result R_O so that the first electric capacity C1 storage result PR.As shown in Figure 2, core cell 214 comprises amplifier the 216, second electric capacity C2, the 3rd electric capacity C3, the 3rd switching switch SW3, the 4th switching switch SW4, the 5th switching switch SW5 and the 6th switching switch SW6.As shown in Figure 2, amplifier 216 has first input port P_1, the second input port P_2 and output port P_OUT, and wherein the second input port P_2 is coupled to reference voltage end V_R (such as, having the voltage end of constant voltage or ground voltage).Second electric capacity C2 is coupled between first input port P_1 and output port P_OUT, and the 3rd electric capacity C2 is coupled between first input port P_1 and the second specific endpoints N2.Control unit 212 is in order to produce multiple switch controlling signal S_C1～S_C6, plurality of switch controlling signal S_C1～S_C6 is respectively intended to control multiple switching switch SW1～SW6 Guan Bi/conducting and open/disconnect, more specifically, the first switching switch SW1 is in order to optionally the first specific endpoints N1 to be coupled to reference voltage end V_R according to the first switch controlling signal S_C1；Second switching switch SW2 is in order to optionally to be coupled to by the first specific endpoints N1 adjustment function block 220 according to second switch control signal S_C2；3rd switching switch SW3 optionally current source CR to be coupled to first input port P_1 according to the 3rd switch controlling signal S_C3；According to the 4th switch controlling signal S_C4,4th switching switch SW4 that preset reference voltage optionally inputs V_IN and is coupled to the second specific endpoints N2；5th switching switch SW5 optionally to be coupled to by first input port P_1 output port P_OUT according to the 5th switch controlling signal S_C5；And the 6th switching switch SW6 optionally the second specific endpoints N2 to be coupled to reference voltage end V_R according to the 6th switch controlling signal S_C6.
In this embodiment, adjust function block 220 and comprise amplifier 226 and electric capacity C.Amplifier 226 has multiple input port P_A and P_B and output port P_C, and wherein input port P_A is in order to receive result PR, and output port P_C is in order to export adjustment signal S_A, and input port P_B is coupled to reference voltage end V_R.It addition, electric capacity C is coupled between input port P_A and output port P_C.Please consulting Fig. 2 together with Fig. 3, wherein Fig. 3 is the signal timing diagram of the implementation example of the multiple switch controlling signal S_C1～S_C6 for controlling the multiple switching switch SW1～SW6 shown in Fig. 2.In this implementation example, when switch controlling signal is in the first voltage quasi position (such as, high voltage level) time, the switching switch that this switch controlling signal controls can be closed/turn on, and when this switch controlling signal is in the second voltage quasi position (such as, low voltage level) time, the switching switch that this switch controlling signal controls can be unlocked/disconnect.In design variation, multiple switching switch SW1～SW6 also can be set and close/turn on when multiple switch controlling signal S_C1～S_C6 are in low voltage level.
For example (but the invention is not limited in this), when electric current input I_IN is converted into voltage signal, as the first switching switch SW1, 3rd switching switch SW3 and the 4th switching switch SW4 is in closure state (closed), and the second switching switch SW2, when 5th switching switch SW5 and the 6th switching switch SW6 is in opening (open) (that is, after time point T1), core cell 214 utilizes electric current input I_IN to the second electric capacity C2 charging to produce voltage signal in output port P_OUT, and utilize the second electric capacity C2, the circuit that 3rd electric capacity C3 and amplifier 216 form to produce another voltage signal of corresponding preset reference voltage input V_IN in output port P_OUT, that is, the magnitude of voltage of output port P_OUT is inputted I_IN and preset reference voltage input V_IN by electric current and is contributed.In implementation example, when reference voltage end V_R is earth terminal (ground), the magnitude of voltage of another then above-mentioned voltage signal is-V_IN × (C3/C2), therefore, the output result R_O (that is, the magnitude of voltage of output port P_OUT) being stored in the first electric capacity C1 can be considered the voltage difference between this voltage signal and preset reference voltage input V_IN.
When the 3rd switching switch SW3 and the 4th switching switch SW4 switches to closure state by opening, and first switching switch S1 still in closure state time (that is, after time point T2), the output result R_O being stored in the first electric capacity C1 can tend towards stability.When the first switching switch SW1, the 3rd switching switch SW3 and the 4th switching switch SW4 are in opening (that is, after time point T3), owing to electric capacity has the characteristic maintaining fixing cross-pressure (voltagedrop), therefore core cell 214 can pass through adjust output port P_OUT magnitude of voltage (that is, output result R_O) change the current potential (that is, result PR) of the first specific endpoints N1.More specifically, after time point T4, second switching switch SW2, the 5th switching switch SW5 and the 6th switching switch SW6 switch to closure state by opening, therefore, the magnitude of voltage of output port P_OUT is adjusted to the voltage of reference voltage end V_R (such as, ground voltage), and the current potential of the first specific endpoints N1 (that is, result PR) output can adjust operation to adjusting function block 220 for follow-up by the first electric capacity C1.For example, when reference voltage end V_R is earth terminal, when the first specific endpoints N1 is not coupled to reference voltage end V_R (such as, in time point T4), the exportable ground voltage of core cell 214 is used as output result R_O so that the first electric capacity C1 stores result PR, therefore, core cell 214 can by the magnitude of voltage of output port P_OUT from this above-mentioned voltage difference (such as,-1 volt) it is adjusted to this ground voltage (such as, 0 volt), the current potential making the first specific endpoints N1 also has the adjustment amplitude of this voltage difference (such as, 1 volt), therefore, adjust function block 220 can according to receive electric current input I_IN and preset reference voltage input V_IN between difference information (that is, this above-mentioned voltage difference) produce to adjust signal S_A to adjust electric current input I_IN.
As it has been described above, after time point T4, adjusting function block 220 and can receive the current potential (that is, result PR) of the first specific endpoints N1, in other words, input port P_A can receive the current potential of the first specific endpoints N1.In this embodiment, adjust function block 220 and can be considered integrator circuit, therefore, the current potential of output port P_C (that is, adjust signal S_A) can adjust to reach with the current potential (that is, result PR) of input port P_A the purpose of stabling current input I_IN.It addition, the second switching switch SW2 after the 5th switching switch SW5 is switched to opening by closure state (as shown in time point T5), can be switched to opening (as shown in time point T6) by closure state.In implementation example, the repeatable operation performing to adjust electric current input I_IN of current correction circuit 200, until the result PR instruction that adjustment function block 220 receives is without till adjusting electric current input I_IN (such as, the current potential of the first specific endpoints N1 after adjustment is still this ground voltage).In other words, between size and the size of preset reference voltage input V_IN of electric current input I_IN, there is this predetermined ratio.It should be noted that the above need being intended for explanation, be not used for the restriction as the present invention.In design variation, the constant voltage that reference voltage end V_R is coupled to ungrounded voltage is also feasible.In another design variation, also preset reference voltage can be inputted V_IN and be converted to current signal, for core cell 214 to this current signal and electric current input I_IN process.
As known from the above, in preferred embodiment, relation between multiple switch controlling signal S_C1～S_C6 can simply be summarized as follows: the 4th switch controlling signal S_C4 and the 6th switch controlling signal S_C6 is non-overlapped signal, 3rd switch controlling signal S_C3 and the 5th switch controlling signal S_C5 is non-overlapped signal, first switch controlling signal S_C1, 3rd switch controlling signal S_C3 and the 4th switch controlling signal S_C4 is least partially overlapped, and second switch control signal S_C2, 5th switch controlling signal S_C5 and the 6th switch controlling signal S_C6 is least partially overlapped.It addition, the first switching switch SW1 is after the 3rd switching switch SW3 and the four switching switch SW4 is switched to opening by closure state, just opening can be switched to by closure state.Second switching switch SW2, after the 5th switching switch SW5 is switched to opening by closure state, just can be switched to opening by closure state.
Please note, the circuit framework using the process function block 210 shown in Fig. 2 carrys out the process function block 110 shown in implementation Fig. 1 and is only used as example explanation, in other words, any V_IN and electric current input I_IN that can preset reference voltage be inputted processes and the circuit framework of preset reference voltage input V_IN and the result PR of the information of electric current input I_IN that produces according to this to carry under one's arms all can be adopted by the process function block 110 shown in Fig. 1；Similarly, the circuit framework using the adjustment function block 220 shown in Fig. 2 carrys out the adjustment function block 120 shown in implementation Fig. 1 and is only used as example explanation, in other words, any can according to result PR adjust electric current input I_IN circuit framework all can be adopted by the adjustment function block 120 shown in Fig. 1.Change in these designs each falls within scope of the invention.
Furthermore, owing to the process function block 210 shown in Fig. 2 and the circuit framework adjusting function block 220 are only a kind of embodiments possible of current correction circuit of the present invention, therefore, the number of the above switching switch and switch controlling signal is intended for needing of explanation, not it is used for the restriction as the present invention, as long as can reach equally to produce the preset reference voltage input V_IN result PR with the information of electric current input I_IN that carries under one's arms, the number of switching switch and switch controlling signal is not limited to the number shown in Fig. 2.Referring to Fig. 4, Fig. 4 is the present invention in order to adjust the schematic diagram of another embodiment of the current correction circuit of electric current input I_IN produced by current source CR, and wherein the framework of current correction circuit 400 is based on the framework of the current correction circuit shown in Fig. 1 and Fig. 2.As shown in Figure 4, current correction circuit 400 comprises the adjustment function block 120 shown in Fig. 1, and processes function block 410.Additionally, process function block 410 to comprise control unit 412, core cell 414 and the first electric capacity C1 shown in Fig. 2, the first switching switch SW1 and second switching switch SW2.Similarly, core cell 414 inputs I_IN and preset reference voltage V_IN input for electric current to carry out processing to store output result R_O to first electric capacity C1, then adjusts output result R_O so that the first electric capacity C1 stores result PR.Control unit 412 is in order to produce multiple switch controlling signal, it includes at least the first switch controlling signal S_C1 and second switch control signal S_C2, wherein the first switch controlling signal S_C1 and second switch control signal S_C2 is respectively intended to the Guan Bi/conducting controlling the first switching switch SW1 and second switching switch SW2 and opens/disconnect, more specifically, first switching switch SW1 is in order to optionally the first specific endpoints N1 to be coupled to reference voltage end V_R (such as according to the first switch controlling signal S_C1, there is the voltage end of constant voltage or ground voltage), and second switching switch SW1 in order to optionally to be coupled to by the first specific endpoints N1 adjustment function block 120 according to second switch control signal S_C2.
Please consulting Fig. 4 together with Fig. 5, wherein Fig. 5 is the signal timing diagram of the implementation example of the multiple switch controlling signal S_C1～S_C2 for controlling the multiple switching switch SW1～SW2 shown in Fig. 4.For example (but the invention is not limited in this), when electric current input I_IN is converted into voltage signal, when when the first switching switch S1 is in closure state, the second switching switch SW2 is in opening (that is, after time point T1), the voltage difference that this voltage signal and preset reference voltage input between V_IN can be stored to the first electric capacity C1 by core cell 414, that is, the current potential of end points NS (that is, export result R_O) can level off to this voltage difference；When the first switching switch SW1 is in opening (that is, after time point T2), core cell 214 can pass through to adjust the current potential (that is, export result R_O) of end points NS and change the current potential (that is, result PR) of the first specific endpoints N1；And when when the first switching switch SW1 is in opening, the second switching switch SW2 is in closure state (that is, after time point T3), core cell 214 adjust end points NS current potential (that is, output result R_O) after, the current potential of the first specific endpoints N1 (that is, result PR) output can be adjusted operation to adjusting function block 120 for follow-up by the first electric capacity C1.Note that after time point T3 the operation of the current potential (that is, export result R_O) just performing to adjust end points NS is also feasible.
As mentioned above, operation and the storage/transmission of signal of the switching switch of current correction circuit 400 can simply be summarized as follows: when the first specific endpoints N1 be coupled to reference voltage end V_R and the first specific endpoints N1 be not coupled to adjustment function block 120 time, the first electric capacity C1 can store and export result R_O；And when the first specific endpoints N1 is not coupled to reference voltage end V_R, the first electric capacity C1 can store result PR, and when the first specific endpoints N1 is coupled to adjustment function block 120, the first electric capacity C1 can output processing result PR to adjusting function block 120.Additionally, in a preferred embodiment, the first switch controlling signal S_C1 and second switch control signal S_C2 is non-overlapped signal.Additionally, when reference voltage end V_R is earth terminal, when the first specific endpoints N1 is not coupled to reference voltage end V_R, the exportable ground voltage of core cell 414 is used as output result R_O so that the first electric capacity C1 stores result PR.Owing to those skilled in the art are after reading about the explanation of Fig. 1～Fig. 3, the operational details of current correction circuit 400 should be understood easily, therefore further instruction just repeats no more at this.
Refer to the function block schematic diagram of the embodiment that Fig. 6, Fig. 6 are ramp generator of the present invention (rampgenerator).Ramp generator 600 comprises (but being not limited to) current source CR, aforesaid current correction circuit 100/200/400 and ramp generating circuit (rampgeneratorcircuit) 602.Current source CR is in order to produce electric current input I_IN, and current correction circuit 100/200/400 is in order to adjust electric current input I_IN produced by current source CR.Ramp generating circuit 602 is coupled to current source CR, in order to produce ramp signal (rampsignal) S_R according to the electric current input I_IN after adjusting via current correction circuit 100/200/400.Owing to those skilled in the art are after reading about the explanation of Fig. 1～Fig. 5, the operational details of ramp generator 600 should be understood easily, therefore further instruction just repeats no more at this.
Summary, disclosed current correction circuit can input (such as according to preset reference voltage, band gap reference voltage) adjust electric current input, and then the impact that electric current is inputted by the variation reducing/prevent resistance element, therefore can the performance (such as, the oblique wave linearity or ramp slopes) of lifting inclined baud generator.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to claim change and modify, and all should belong to the covering scope of the present invention.
Claims (12)
1., in order to adjust a current correction circuit for electric current input produced by current source, comprise:
Process function block, be coupled to described current source, in order to receive preset reference voltage input and the input of described electric current, and produce result according to the input of described preset reference voltage with the input of described electric current；And
Adjust function block, it is coupled to described process function block and described current source, in order to produce to adjust signal to described current source to adjust the input of described electric current according to described result, so that there is predetermined ratio between the size of the size of described electric current input and the input of described preset reference voltage
Wherein said process function block comprises:
Control unit, in order to produce multiple switch controlling signal, wherein said multiple switch controlling signals include at least the first switch controlling signal and second switch control signal；
Core cell；
First electric capacity, it is coupled between described core cell and the first specific endpoints, wherein said core cell carries out processing to store output result to described first electric capacity for the input of described electric current and the input of described preset reference voltage, then adjusts described output result so that described first electric capacity stores described result；
First switching switch, in order to optionally described first specific endpoints to be coupled to reference voltage end according to described first switch controlling signal；And
Second switching switch, in order to optionally described first specific endpoints to be coupled to described adjustment function block according to described second switch control signal.
2. current correction circuit as claimed in claim 1, wherein when described first specific endpoints is coupled to described reference voltage end and described first specific endpoints is not coupled to described adjustment function block, described first electric capacity can store described output result；And when described first specific endpoints is not coupled to described reference voltage end, described first electric capacity can store described result, and when described first specific endpoints is coupled to described adjustment function block, described first electric capacity can export described result extremely described adjustment function block.
3. current correction circuit as claimed in claim 1, wherein said first switch controlling signal and described second switch control signal are non-overlapped signal.
4. current correction circuit as claimed in claim 1, wherein said reference voltage end is earth terminal, and when described first specific endpoints is not coupled to described reference voltage end, described core cell output ground voltage is used as described output result so that described first electric capacity stores described result.
5. current correction circuit as claimed in claim 1, wherein said multiple switch controlling signals separately comprise the 3rd switch controlling signal, the 4th switch controlling signal, the 5th switch controlling signal and the 6th switch controlling signal；And described core cell comprises:
Amplifier, has first input port, the second input port and output port, and wherein said second input port is coupled to described reference voltage end；
Second electric capacity, is coupled between described first input port and described output port；
3rd electric capacity, is coupled between described first input port and the second specific endpoints；
3rd switching switch, optionally described current source to be coupled to described first input port according to described 3rd switch controlling signal；
4th switching switch, optionally the input of described preset reference voltage to be coupled to described second specific endpoints according to described 4th switch controlling signal；
5th switching switch, optionally described first input port to be coupled to described output port according to described 5th switch controlling signal；And
6th switching switch, optionally described second specific endpoints to be coupled to described reference voltage end according to described 6th switch controlling signal.
6. current correction circuit as claimed in claim 5, wherein said 4th switch controlling signal and described 6th switch controlling signal are non-overlapped signal, described 3rd switch controlling signal and described 5th switch controlling signal are non-overlapped signal, described first switch controlling signal, described 3rd switch controlling signal and described 4th switch controlling signal are least partially overlapped, and described second switch control signal, described 5th switch controlling signal and described 6th switch controlling signal are least partially overlapped.
7. current correction circuit as claimed in claim 6, wherein after described 3rd switching switch and described 4th switching switch are switched to opening by closure state, described first switching switch just meeting be switched to opening by closure state.
8. current correction circuit as claimed in claim 6, wherein after described 5th switching switch is switched to opening by closure state, described second switching switch just can be switched to opening by closure state.
9. current correction circuit as claimed in claim 1, wherein said adjustment function block comprises:
Amplifier, there is first input port, the second input port and output port, wherein said first input port is in order to receive described result, and described output port is in order to export described adjustment signal, and described second input port is coupled to reference voltage end；And
Electric capacity, is coupled between described first input port and described output port.
10. current correction circuit as claimed in claim 1, the input of wherein said preset reference voltage is band gap reference voltage.
11. for a current correction method for the current correction circuit as according to any one of claim 1-10, comprise:
Result is produced with the input of described electric current according to preset reference voltage input；And
Produce to adjust signal to described current source to adjust the input of described electric current according to described result, so that there is predetermined ratio between the size of the size of described electric current input and the input of described preset reference voltage.
12. a ramp generator, comprise:
Current source, in order to produce electric current input；
Current correction circuit, in order to adjust described electric current input produced by described current source, comprises:
Process function block, be coupled to described current source, in order to receive preset reference voltage input and the input of described electric current, and produce result according to the input of described preset reference voltage with the input of described electric current；And
Adjust function block, it is coupled to described process function block and described current source, in order to produce to adjust signal to described current source to adjust the input of described electric current according to described result, so that there is predetermined ratio between the size of the size of described electric current input and the input of described preset reference voltage；And
Ramp generating circuit, is coupled to described current source, in order to produce ramp signal according to via the described electric current input after described current correction circuit adjustment,
Wherein said process function block comprises:
Control unit, in order to produce multiple switch controlling signal, wherein said multiple switch controlling signals include at least the first switch controlling signal and second switch control signal；
Core cell；
First electric capacity, it is coupled between described core cell and the first specific endpoints, wherein said core cell carries out processing to store output result to described first electric capacity for the input of described electric current and the input of described preset reference voltage, then adjusts described output result so that described first electric capacity stores described result；
First switching switch, in order to optionally described first specific endpoints to be coupled to reference voltage end according to described first switch controlling signal；And
Second switching switch, in order to optionally described first specific endpoints to be coupled to described adjustment function block according to described second switch control signal.
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| CN201310334698.6A CN104345760B (en) | 2013-08-02 | 2013-08-02 | Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source |
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| CN201310334698.6A CN104345760B (en) | 2013-08-02 | 2013-08-02 | Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source |
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| CN104345760A CN104345760A (en) | 2015-02-11 |
| CN104345760B true CN104345760B (en) | 2016-06-29 |
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| CN201310334698.6A Active CN104345760B (en) | 2013-08-02 | 2013-08-02 | Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009399A (en) * | 1974-10-07 | 1977-02-22 | Tektronix, Inc. | Gated ramp generator |
| US5394020A (en) * | 1992-12-30 | 1995-02-28 | Zenith Electronics Corporation | Vertical ramp automatic amplitude control |
| CN102541148A (en) * | 2010-12-31 | 2012-07-04 | 国民技术股份有限公司 | Two-way adjustable reference current generating device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4996294B2 (en) * | 2007-03-19 | 2012-08-08 | 株式会社リコー | Power supply device, LED device using the power supply device, and electronic apparatus |
| DE102009060504B4 (en) * | 2009-12-23 | 2014-07-03 | Atmel Corp. | A circuit and method for adjusting an offset output current for an input current amplifier |
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2013
- 2013-08-02 CN CN201310334698.6A patent/CN104345760B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009399A (en) * | 1974-10-07 | 1977-02-22 | Tektronix, Inc. | Gated ramp generator |
| US5394020A (en) * | 1992-12-30 | 1995-02-28 | Zenith Electronics Corporation | Vertical ramp automatic amplitude control |
| CN102541148A (en) * | 2010-12-31 | 2012-07-04 | 国民技术股份有限公司 | Two-way adjustable reference current generating device |
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| Publication number | Publication date |
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| CN104345760A (en) | 2015-02-11 |
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