CN102541148A - Two-way adjustable reference current generating device - Google Patents
Two-way adjustable reference current generating device Download PDFInfo
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- CN102541148A CN102541148A CN2010106185906A CN201010618590A CN102541148A CN 102541148 A CN102541148 A CN 102541148A CN 2010106185906 A CN2010106185906 A CN 2010106185906A CN 201010618590 A CN201010618590 A CN 201010618590A CN 102541148 A CN102541148 A CN 102541148A
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Abstract
The invention relates to a two-way adjustable reference current generating device, which comprises a voltage/current conversion device, a current mirror, a current source switch adjustment array and a switch control signal decoding circuit, wherein the voltage/current conversion device and the current mirror are connected in series; the current source switch adjustment array is connected in parallel with a series circuit formed by the voltage/current conversion device and the current mirror; and the switch control signal decoding circuit is used for controlling switches in the current source switch adjustment array. The two-way adjustable reference current generating device provided by the invention is capable of correcting reference current bias caused by a manufacturing process, thereby, the precision of reference current can be increased, and the performance of a circuit chip using the reference current is further promoted.
Description
Technical field
The present invention relates to the mimic channel field, relate in particular to a kind of two-way adjustable reference electric current-producing device.
Background technology
Reference current has widespread use in Analogous Integrated Electronic Circuits, because electric current not loss on long metal wire, and voltage has loss, so in the mimic channel of wiring more complicated, current reference is more welcome.
Fig. 1 is the circuit diagram of a kind of common reference current generator in the prior art.As shown in Figure 1, this existing reference current generator is made up of the voltage commentaries on classics current device and the current mirror of series connection.Wherein, voltage changes current device by differential operational amplifier A0, and NMOS pipe M20 and resistance R 0 are formed, and the in-phase input end of differential operational amplifier A0 connects a reference voltage V with low-temperature coefficient
Ref, inverting input is connected to the source electrode of NMOS pipe M20, and output terminal is connected to the grid of NMOS pipe M20; Resistance R 0 one is connected to the source electrode of NMOS pipe M20, other end ground connection GND; Current mirror is made up of PMOS pipe M10 and PMOS pipe M30; The source electrode of PMOS pipe M10 and PMOS pipe M30 all is connected to power vd D; PMOS pipe M10 and PMOS manage the grid short circuit of M30 and link to each other with the drain electrode of PMOS pipe M10; The drain electrode of PMOS pipe M10 is connected to the drain electrode of NMOS pipe M20 pipe, and the drain electrode of PMOS pipe M30 is reference current output.
It is thus clear that traditional reference current generator generally is to convert a reference voltage with low-temperature coefficient into electric current through differential operational amplifier and resistance, duplicates this electric current through current mirror arrangement then and obtains one or more reference currents.The ultimate principle of duplicating is to be operated in the saturation region and to have same size and two identical electric currents of transistor transmission of gate source voltage.Under the situation of not considering second-order effect, the saturation region electric current is:
I wherein
DFor flowing through the electric current of MOSFET, μ is the mobility of channel carrier, in the NMOS pipe, is electron mobility, in the PMOS pipe, is hole mobility, C
OxBe unit area gate oxide electric capacity, v
GSBe gate source voltage, V
THBe threshold voltage.Unit area gate oxide capacitance C
OxWith threshold voltage V
THAll relevant with technology.In actual chips was made, technological parameter had randomness within the specific limits, even therefore given gate source voltage also can cause the reference current value and there are differences between the design load in advance.If exist a large amount of current sources to duplicate this reference current (for example current steering digital-to-analog converter) in the circuit, can make the electric current after duplicating produce deviation, finally influence the entire chip performance.
Therefore, because the randomness of technological parameter has caused the not high situation of ubiquity reference current precision in the prior art, thereby has influenced the performance of the circuit chip that uses this reference current.
Summary of the invention
Technical matters to be solved by this invention provides a kind of two-way adjustable reference electric current-producing device, can improve the precision of reference current, thereby promotes the performance of the circuit chip that uses this reference current.
For solving the problems of the technologies described above; The present invention proposes a kind of two-way adjustable reference electric current-producing device; Change current device and current mirror, adjust array by the voltage that is connected in series with the parallelly connected current supply switch of series circuit that said voltage commentaries on classics current device and said current mirror are formed, and the switch controlling signal decoding scheme composition of controlling switch in the said current supply switch adjustment array.
Further, said apparatus also can have following characteristics, and said voltage changes current device to be made up of differential operational amplifier A, NMOS pipe M2 and resistance R, and the in-phase input end of differential operational amplifier A connects the reference voltage V with low-temperature coefficient
Ref, inverting input is connected to the source electrode of NMOS pipe M2, and output terminal is connected to the grid of NMOS pipe M2, and the drain electrode of NMOS pipe M2 is connected to the input end of said current mirror, and resistance R one is connected to the source electrode of NMOS pipe M2, other end ground connection GND.
Further; Said apparatus also can have following characteristics; Said current mirror is made up of PMOS pipe M1 and PMOS pipe M3, and the source electrode of PMOS pipe M1 and PMOS pipe M3 all is connected to power vd D, and PMOS manages the grid short circuit of M1 and PMOS pipe M3 and links to each other with the drain electrode of PMOS pipe M1; PMOS pipe M1 drain electrode is the input end of said current mirror, and the drain electrode of PMOS pipe M3 is reference current I
RefOutput terminal.
Further, said apparatus also can have following characteristics, and said current supply switch adjustment array comprises n+1 unit; Each unit is made up of current source I1, switch S, current source I2 and switch Q; Electric current among current source I1 and the current source I2 equates that one of current source I1 is connected to power vd D, and the other end is connected to an end of switch S; The input end of the said current mirror of another termination of switch S; The end ground connection GND of current source I2, the end of another termination switch Q, the input end of the said current mirror of another termination of switch Q.
Further, said apparatus also can have following characteristics, and said voltage changes current device to be made up of differential operational amplifier A4, PMOS pipe M42 and resistance R 4, and the in-phase input end of differential operational amplifier A4 connects the reference voltage V with low-temperature coefficient
Ref, inverting input is connected to the source electrode of PMOS pipe M42, and output terminal is connected to the grid of PMOS pipe M42, and the drain electrode of PMOS pipe M42 is connected to the input end of said current mirror, and one of resistance R 4 is connected to the source electrode of PMOS pipe M42, another termination power vd D.
Further; Said apparatus also can have following characteristics; Said current mirror manages M41 by NMOS and NMOS pipe M43 forms, and the source electrode of NMOS pipe M41 and NMOS pipe M43 all is connected to ground GND, and NMOS manages the grid short circuit of M41 and NMOS pipe M43 and links to each other with the drain electrode of NMOS pipe M41; The drain electrode of NMOS pipe M41 is the input end of said current mirror, and the drain electrode of NMOS pipe M43 is reference current I
RefOutput terminal.
Further, said apparatus also can have following characteristics, and said current supply switch adjustment array comprises n+1 unit; Each unit is made up of current source I41, switch S 4, current source I42 and switch Q4; Electric current among current source I41 and the current source I42 equates that one of current source I41 is connected to power vd D, and the other end is connected to an end of switch S 4; The input end of another termination current mirror of switch S 4; The end ground connection GND of current source I42, the end of another termination switch Q4, the input end of another termination current mirror of switch Q4.
Two-way adjustable reference electric current-producing device provided by the present invention can be proofreaied and correct the reference current deviation that is caused by manufacturing process, thereby can improve the precision of reference current, and then promotes the performance of the circuit chip that uses this reference current.
Description of drawings
Fig. 1 is the circuit diagram of a kind of common reference current generator in the prior art;
Fig. 2 is the circuit diagram of two-way adjustable reference electric current-producing device in the first embodiment of the invention;
Fig. 3 is the switch controlling signal decoding scheme that current supply switch is adjusted switch in the array in the control chart 2;
Fig. 4 is the circuit diagram of two-way adjustable reference electric current-producing device in the second embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and characteristic are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
First embodiment
Fig. 2 is the circuit diagram of two-way adjustable reference electric current-producing device in the first embodiment of the invention, and Fig. 3 is the switch controlling signal decoding scheme that current supply switch is adjusted switch in the array in the control chart 2.As shown in Figures 2 and 3; In the present embodiment; Two-way adjustable reference electric current-producing device is made up of the switch controlling signal decoding scheme that voltage changes switch in current device 2, current mirror, current supply switch adjustment array 1 and the Control current source switch adjustment array; Wherein voltage changes current device and connect with current mirror, and current supply switch adjustment array is parallelly connected with the series circuit of voltage commentaries on classics current device and current mirror composition, the switch controlling signal decoding scheme be input as M road external signal F
1, F
2..., F
M-1, F
M, be output as 2 (n+1) way switch control signal S0, S1......Sn, Q0, Q1......Qn, the respective switch in this 2 (n+1) way switch control signal difference control chart 2 in the current supply switch adjustment array.Wherein, in the present embodiment, voltage changes current device to be made up of differential operational amplifier A, NMOS pipe M2 and resistance R, and the in-phase input end of differential operational amplifier A connects the reference voltage V with low-temperature coefficient
RefInverting input is connected to the source electrode of NMOS pipe M2, and output terminal is connected to the grid of NMOS pipe M2, and the drain electrode of NMOS pipe M2 is connected to the drain electrode of PMOS pipe M1 (drain electrode of PMOS pipe M1 is the input end of current mirror); One of resistance R is connected to the source electrode of NMOS pipe M2, other end ground connection GND; Current mirror is made up of PMOS pipe M1 and PMOS pipe M3; The source electrode of PMOS pipe M1 and PMOS pipe M3 all is connected to power vd D; PMOS pipe M1 and PMOS manage the grid short circuit of M3 and link to each other with the drain electrode of PMOS pipe M1, and PMOS pipe M1 drain electrode is the input end of current mirror, and the drain electrode of PMOS pipe M3 is reference current I
RefOutput terminal; Current supply switch adjustment array comprises n+1 unit, and each unit is made up of current source I1, switch S, current source I2 and switch Q, and the electric current among current source I1 and the current source I2 equates; One of current source I1 is connected to power vd D; The other end is connected to an end of switch S, the input end of another termination current mirror of switch S (being the B point among Fig. 2), the end ground connection GND of current source I2; The end of another termination switch Q; The input end of another termination current mirror of switch Q (being the B point among Fig. 2), in the side circuit design, these current sources and switch can be realized by NMOS pipe or PMOS pipe.Two current source I1 and I2 in the same current supply switch adjustment unit have same current, and the gate source voltage of the current source I1 in all unit is identical, and the gate source voltage of current source I2 is identical, its breadth length ratio
Be Geometric Sequence, be followed successively by
, can know that by formula (1) current value of current source is followed successively by I in the array
0, 2I
0..., 2
nI
0, that is to say, in the adjacent cells of this n+1 unit among current source I1 and the current source I2 size of electric current be followed successively by I respectively with 2 times speed increase
0, 2I
0..., 2
nI
0, I
0Be the minimal adjustment precision.
The course of work of two-way adjustable reference electric current-producing device shown in Figure 2 is following: the reference voltage V with low-temperature coefficient
RefThe in-phase end of input difference operational amplifier A, the end of oppisite phase of amplifier is connected to node A, can be known the voltage V of node A by the character of amplifier
A=V
Ref, be a definite value, so flow through the electric current of resistance R
It also is a definite value.Because the grid of M2 pipe does not have electric current to flow through, the electric current that flows through the drain electrode of M2 pipe equals to flow through the electric current of R.If the reference current of actual measurement is bigger than normal than predetermined value, then input signal F
MAll switching tube Q are broken off, then according to needed reference current size, input appropriate control signals F
1, F
2..., F
M-1,, control corresponding switch S through behind the decoding unit
0, S
1..., S
nIn one or more closure, at this moment with current source that Closing Switch is connected in electric current flow into Node B be certain value owing to flow through the electric current of M2 pipe
So the electric current that flows into Node B through the M1 pipe reduces, thereby makes reference current under the effect of current mirror, reduce; If the reference current of actual measurement is less than normal than predetermined value, then input signal F
MAll switching tube S are broken off, then according to needed reference current size, input appropriate control signals F
1, F
2..., F
M-1,, control corresponding switch Q through behind the decoding unit
0, Q
1..., Q
nIn one or more closure, at this moment from Node B flow out electric current and through Closing Switch to respective current sources, same because to flow through the electric current of M2 pipe be definite value
So the electric current that flows into Node B through the M1 pipe increases, thereby makes reference current under the effect of current mirror, increase.Suppose the ratio of the breadth length ratio of M1 pipe and M3 pipe
Reference current I
RefActual value and the maximum deviation of design load be ± Δ I.Because so the grid and the source shorted of M1 pipe and M3 pipe are their gate source voltage v
GSEquate, can know that the maximum deviation electric current that flows through the M1 pipe is ± a Δ I by formula (1).If I1 electric current sum and I2 electric current sum all equal a Δ I, i.e. I respectively in the current source array
0+ 2I
0+ ...+2
nI
0=a Δ I, two-way adjustable reference electric current-producing device then shown in Figure 2 just can be realized the adjusting to current reference, degree of regulation does
The two-way adjustable reference electric current-producing device of present embodiment can be proofreaied and correct the reference current deviation that is caused by manufacturing process, thereby can improve the precision of reference current, and then promotes the performance of the circuit chip that uses this reference current.
Second embodiment
Fig. 4 is the circuit diagram of two-way adjustable reference electric current-producing device in the second embodiment of the invention.
As shown in Figure 4; In the present embodiment, two-way adjustable reference electric current-producing device also is made up of the switch controlling signal decoding scheme (not shown among Fig. 4) of switch in voltage commentaries on classics current device, current mirror, current supply switch adjustment array and the Control current source switch adjustment array.Different with first embodiment is in the present embodiment, form the M41 pipe and the effective NMOS pipe of M43 of current source and realize, and the effective PMOS of M42 that voltage changes in the current device to realize.
In the present embodiment, voltage changes current device to be made up of differential operational amplifier A4, PMOS pipe M42 and resistance R 4, and the in-phase input end of differential operational amplifier A4 connects the reference voltage V with low-temperature coefficient
RefInverting input is connected to the source electrode of PMOS pipe M42, and output terminal is connected to the grid of PMOS pipe M42, and the drain electrode of PMOS pipe M42 is connected to the drain electrode of NMOS pipe M41 (drain electrode of NMOS pipe M41 is the input end of current mirror); One of resistance R 4 is connected to the source electrode of PMOS pipe M42, another termination power vd D; Current mirror is made up of NMOS pipe M41 and NMOS pipe M43; The source electrode of NMOS pipe M41 and NMOS pipe M43 all is connected to ground GND; NMOS pipe M41 and NMOS manage the grid short circuit of M43 and link to each other with the drain electrode of NMOS pipe M41; The drain electrode of NMOS pipe M41 is the input end of current mirror, and the drain electrode of NMOS pipe M43 is reference current I
RefOutput terminal; Current supply switch adjustment array comprises n+1 unit, and each unit is made up of current source I41, switch S 4, current source I42 and switch Q4, and the electric current among current source I41 and the current source I42 equates; One of current source I41 is connected to power vd D; The other end is connected to an end of switch S 4, the input end of another termination current mirror of switch S 4 (being the B4 point among Fig. 4), the end ground connection GND of current source I42; The end of another termination switch Q4; The input end of another termination current mirror of switch Q4 (being the B4 point among Fig. 4), in the adjacent cells of this n+1 unit among current source I41 and the current source I42 size of electric current be followed successively by I respectively with 2 times speed increase
0, 2I
0..., 2
nI
0, I
0Be the minimal adjustment precision.In the present embodiment, the switch controlling signal decoding scheme of switch is identical with first embodiment in the Control current source switch adjustment array, repeats no more here.
Because in the present embodiment; Forming the M41 pipe and the effective NMOS pipe of M43 of current source realizes; And the effective PMOS pipe of M42 that voltage changes in the current device is realized, and among first embodiment M1 pipe realize with the effective PMOS pipe of M3, the realization of the effective NMOS pipe of M2, so the course of work of two-way adjustable reference circuit generation device is opposite with first embodiment in the present embodiment; The course of work in the present embodiment is: the reference current as if actual measurement is bigger than normal than predetermined value, then input signal F
MAll switching tube S4 are broken off, then according to needed reference current size, input appropriate control signals F
1, F
2..., F
M-1,, control corresponding switch Q through behind the decoding unit
0, Q
1..., Q
nIn one or more closure, at this moment the part electric current flows out Node B 4 through closed switch Q4, is certain value owing to flow through the electric current of M42 pipe
So the electric current that flows into the M41 pipe from Node B 4 reduces, thereby makes reference current under the effect of current mirror, reduce; If the reference current of actual measurement is less than normal than predetermined value, then input signal F
MAll switching tube Q4 are broken off, then according to needed reference current size, input appropriate control signals F
1, F
2..., F
M-1,, control corresponding switch S through behind the decoding unit
0, S
1..., S
nIn one or more closure, the electric current of the current source I1 that at this moment links to each other with the switch S 4 of closure flows into Node B 4, and is same because to flow through the electric current of M42 pipe be definite value
So the electric current that flows into M41 from Node B 4 increases, thereby makes reference current under the effect of current mirror, increase.
The two-way adjustable reference electric current-producing device of present embodiment can be proofreaied and correct the reference current deviation that is caused by manufacturing process, thereby can improve the precision of reference current, and then promotes the performance of the circuit chip that uses this reference current.
Therefore two-way adjustable reference electric current-producing device of the present invention does not need extra technology based on standard CMOS process, is easy to realize; Current source current value size is the Geometric Sequence variation in the current supply switch adjustment unit, makes that the degree of regulation of reference current is high.In addition, the present invention controls two groups of switch arrays through external input signal, and the adjustment electric current is flowed out from current mirror or the inflow current mirror, thereby realizes the function of bidirectional modulation reference current.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. two-way adjustable reference electric current-producing device; It is characterized in that; Change current device and current mirror, adjust array by the voltage that is connected in series with the parallelly connected current supply switch of series circuit that said voltage commentaries on classics current device and said current mirror are formed, and the switch controlling signal decoding scheme composition of controlling switch in the said current supply switch adjustment array.
2. two-way adjustable reference electric current-producing device according to claim 1; It is characterized in that; Said voltage changes current device to be made up of differential operational amplifier (A), NMOS pipe (M2) and resistance (R), and the in-phase input end of differential operational amplifier (A) connects the reference voltage V with low-temperature coefficient
Ref, inverting input is connected to the source electrode of NMOS pipe (M2), and output terminal is connected to the grid of NMOS pipe (M2), and the drain electrode of NMOS pipe (M2) is connected to the input end of said current mirror, and resistance (R) one is connected to the source electrode of NMOS pipe (M2), other end ground connection GND.
3. two-way adjustable reference electric current-producing device according to claim 2; It is characterized in that; Said current mirror is made up of PMOS pipe (M1) and PMOS pipe (M3), and the source electrode of PMOS pipe (M1) and PMOS pipe (M3) all is connected to power vd D, and PMOS manages the grid short circuit of (M1) and PMOS pipe (M3) and links to each other with the drain electrode of PMOS pipe (M1); PMOS pipe (M1) drain electrode is the input end of said current mirror, and the drain electrode of PMOS pipe (M3) is reference current I
RefOutput terminal.
4. two-way adjustable reference electric current-producing device according to claim 3 is characterized in that, said current supply switch adjustment array comprises n+1 unit; Each unit is made up of current source (I1), switch (S), current source (I2) and switch (Q); Electric current in current source (I1) and the current source (I2) equates that one of current source (I1) is connected to power vd D, and the other end is connected to an end of switch (S); The input end of the said current mirror of another termination of switch (S); One end ground connection GND of current source (I2), an end of another termination switch (Q), the input end of the said current mirror of another termination of switch (Q).
5. two-way adjustable reference electric current-producing device according to claim 1; It is characterized in that; Said voltage changes current device to be made up of differential operational amplifier (A4), PMOS pipe (M42) and resistance (R4), and the in-phase input end of differential operational amplifier (A4) connects the reference voltage V with low-temperature coefficient
Ref, inverting input is connected to the source electrode of PMOS pipe (M42), and output terminal is connected to the grid of PMOS pipe (M42), and the drain electrode of PMOS pipe (M42) is connected to the input end of said current mirror, and one of resistance (R4) is connected to the source electrode of PMOS pipe (M42), another termination power vd D.
6. two-way adjustable reference electric current-producing device according to claim 5; It is characterized in that; Said current mirror manages (M41) by NMOS and NMOS pipe (M43) is formed, and the source electrode of NMOS pipe (M41) and NMOS pipe (M43) all is connected to ground GND, and NMOS manages the grid short circuit of (M41) and NMOS pipe (M43) and links to each other with the drain electrode of NMOS pipe (M41); The drain electrode of NMOS pipe (M41) is the input end of said current mirror, and the drain electrode of NMOS pipe (M43) is reference current I
RefOutput terminal.
7. two-way adjustable reference electric current-producing device according to claim 6 is characterized in that, said current supply switch adjustment array comprises n+1 unit; Each unit is made up of current source (I41), switch (S4), current source (I42) and switch (Q4); Electric current in current source (I41) and the current source (I42) equates that one of current source (I41) is connected to power vd D, and the other end is connected to an end of switch (S4); The input end of another termination current mirror of switch (S4); One end ground connection GND of current source (I42), an end of another termination switch (Q4), the input end of another termination current mirror of switch (Q4).
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| CN104345760A (en) * | 2013-08-02 | 2015-02-11 | 英属开曼群岛商恒景科技股份有限公司 | Current correcting circuit and method for adjusting current input generated by current source, and oblique wave generator |
| CN104345760B (en) * | 2013-08-02 | 2016-06-29 | 英属开曼群岛商恒景科技股份有限公司 | Adjust the current correction circuit of electric current input, current correction method and ramp generator produced by current source |
| CN110291486A (en) * | 2017-02-09 | 2019-09-27 | 理光微电子株式会社 | Reference voltage generating circuit and method |
| CN111708400A (en) * | 2020-06-30 | 2020-09-25 | 深圳市芯天下技术有限公司 | Reference voltage circuit with temperature coefficient and adjustable temperature coefficient |
| CN115425961A (en) * | 2022-11-04 | 2022-12-02 | 西安水木芯邦半导体设计有限公司 | High-voltage analog switch array circuit |
| CN115425961B (en) * | 2022-11-04 | 2023-03-10 | 西安水木芯邦半导体设计有限公司 | High-voltage analog switch array circuit |
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