CN103149967A - High-swing programmable current source - Google Patents

High-swing programmable current source Download PDF

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Publication number
CN103149967A
CN103149967A CN2013100503909A CN201310050390A CN103149967A CN 103149967 A CN103149967 A CN 103149967A CN 2013100503909 A CN2013100503909 A CN 2013100503909A CN 201310050390 A CN201310050390 A CN 201310050390A CN 103149967 A CN103149967 A CN 103149967A
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pmos pipe
voltage
pipe
source
high voltage
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CN2013100503909A
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CN103149967B (en
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刘文用
马剑武
陈君
林剑辉
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HUNAN RONGHE MICROELECTRONICS CO Ltd
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HUNAN RONGHE MICROELECTRONICS CO Ltd
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Abstract

The invention discloses a high-swing programmable current source which comprises a reference circuit, a mirror image circuit and a protection circuit, wherein the reference circuit is composed of a first low-voltage PMOS (P-channel Metal Oxide Semiconductor) pipe and a first high-voltage PMOS pipe and a second high-voltage PMOS pipe; the mirror image circuit comprises a second low-voltage PMOS pipe, a third high-voltage PMOS pipe, a fourth high-voltage PMOS pipe, a fifth high-voltage PMOS pipe, a sixth high-voltage PMOS pipe and a seventh high-voltage PMOS pipe; and the protection circuit comprises an eighth high-voltage PMOS pipe and a ninth high-voltage PMOS pipe. The high-swing programmable current source provided by the invention has the advantages as follows: under the same mismatching and output impedance requirements, VdsBIAS drops greatly; secondly, the voltage Vdsswitch occupied by a switch originally can be saved; and thirdly, the high-voltage MOS pipe is used for protecting a low-voltage pipe at the voltages of Vds and Vgs of a clamping low-voltage current telescope. Therefore, the output swing of the current source is enhanced.

Description

A kind of high amplitude of oscillation programmable current source
Technical field
The invention belongs to current source, be specifically related to a kind of high amplitude of oscillation programmable current source.
Background technology
In the high-voltage power supply field, need that size of current is adjustable, during the current source of constant output current, general implementation method programmable current source circuit as shown in Figure 1.At first produce an accurate reference current of roadbed, then by current mirror, produce multichannel and the proportional image current of reference electric current, control by switch, selection one tunnel or multichannel image current, the electric current of the required size of generation.
Fig. 2 is the reference circuit 100 of existing programmable current source and the circuit diagram of mirror image circuit 101.Reference circuit 100 is comprised of high voltage PMOS pipe M1 and M2.Reference electric current I REF flows through reference circuit 100, generation current mirror pipe grid end bias voltage VBIAS, cascade tube grid end bias voltage VCAS.Mirror image circuit 101 is comprised of high voltage PMOS pipe M3, M4, M5.M3 is the current mirror pipe, and current mirror pipe grid end bias voltage VBIAS makes M3 be operated in the saturation region for M3 provides grid end bias voltage, and according to formula, the drain terminal output current of M3: Id=0.5K ' is (Vgs-Vth) (W/L) 2(1+ λ Vds), as long as Vgs and Vds are constant, output current Id is constant.M4 is cascade tube, and when making current source output terminal IOUT change in voltage, the drain-source voltage Vds of M3 is substantially constant, for increasing the output impedance of current source, improves outputting current steadily.M5 is switching tube, is used for selecting mirror image circuit 101 whether to access programmable current source, controls the size of current of current source.
There is the limited problem of output voltage swing in above-mentioned traditional high-voltage power supply territory programmable current source.Analyze its reason: the one, the threshold voltage of high-voltage tube is larger than the threshold voltage of low-voltage tube, in the situation that satisfy same current precision and yield, the required saturation voltage drop Vds of high-voltage tube is larger; The 2nd, switching tube is added on current path, attrition voltage to fall.Suppose that supply voltage VCC is 9V, high voltage PMOS pipe threshold voltage Vth is 1.5V, and the current source output voltage swing is up to: VCC-Vds BIAS-Vds CAS-Vds Switch, wherein, Vds BIASBe the drain-source voltage of current mirror pipe, Vds CASBe the drain-source voltage of cascade tube, Vds SwitchDrain-source voltage for switching tube.Make each device be operated in the saturation region, under critical conditions: Vds BIAS=1V, Vds CAS=0.5V, Vds Switch=0.3V, the pressure drop in load is up to: VCC-1V-0.5V-0.3V=7.2V, when pull-up resistor was 4K Ω, current source can't provide required 2mA electric current.
Summary of the invention
The purpose of this invention is to provide a kind of high amplitude of oscillation programmable current source, to increase the output voltage swing of programmable current source, make it in the situation that output current is different, loading condition is different, keep the stability of programmable current source output current as far as possible.
The technical scheme that realizes the object of the invention employing is as follows:
High amplitude of oscillation programmable current source provided by the invention comprises reference circuit, mirror image circuit, holding circuit;
Described reference circuit is comprised of the first low pressure PMOS pipe and first and second high voltage PMOS pipe; The source of the first high voltage PMOS pipe connects supply voltage, and the grid end of drain terminal and grid end and the second high voltage PMOS pipe links together and connects cascade tube grid end bias voltage; The source of the first low pressure PMOS pipe connects supply voltage, and the drain terminal of grid end and the second high voltage PMOS pipe links together and connects current mirror pipe grid end bias voltage, and drain terminal connects the source of the second high voltage PMOS pipe;
Described mirror image circuit by the second low pressure PMOS manage, third and fourth, five, six, seven high voltage PMOS pipes form; The source of the second low pressure PMOS pipe connects supply voltage, and the drain terminal of grid termination fourth, fifth high voltage PMOS pipe, drain terminal connect the source that third high is pressed the PMOS pipe; Third high is pressed the grid termination the 6th of PMOS pipe, the drain terminal of seven high voltage PMOS pipes, and drain terminal connects current source output;
Described holding circuit is comprised of the 8th, nine high voltage PMOS pipes, is connected across between the source and grid end of the second low pressure PMOS pipe; The source of the 8th high voltage PMOS pipe connects supply voltage, and drain terminal and grid end are linked the source of the 9th high voltage PMOS pipe; The drain terminal of the 9th high voltage PMOS pipe and grid end connect together and connect current mirror pipe grid end bias voltage.
Compare advantage of the present invention with existing programmable current source: the one, adopt low pressure PMOS pipe belt for original high voltage PMOS pipe as the current mirror pipe, be operated in the high-voltage power supply territory, under equal mismatch and output impedance require, Vds BIASTo decline to a great extent; The 2nd, switch is moved to the grid end of current mirror pipe and cascade tube from original current channel, can save the voltage Vds that original switch takies SwitchThe 3rd, adopt low-voltage tube to be operated under the high-voltage power supply territory risk that may be punctured by accident in order to solve, added holding circuit, with Vds and the Vgs voltage of clamp low-voltage current mirror pipe, the protection low-voltage tube.The benefit of bringing like this is the output voltage swing that has improved current source.Suppose that supply voltage VCC is 9V, the current source output voltage swing is up to: VCC-Vds BIAS-Vds CAS, for low pressure PMOS pipe, Vds BIASThe minimum 0.3V that is down to, cascade tube are still high-voltage tube, Vds CASBe 0.3V, the pressure drop in load is up to: VCC-0.3V-0.3V=8.4V, even load is 4K Ω, current source also can provide stable 2mA electric current.The present invention has increased the output voltage swing of programmable current source to greatest extent in the situation that supply voltage is fixing.
Further illustrate technical scheme of the present invention below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the circuit diagram of existing programmable current source.
Fig. 2 is reference circuit, the mirror image circuit schematic diagram in existing programmable current source.
Fig. 3 is circuit diagram of the present invention.
Fig. 4 is reference circuit, mirror image circuit, the holding circuit schematic diagram in the present invention.
Embodiment
The present invention comprises reference circuit, mirror image circuit, holding circuit as shown in Figure 3, Figure 4.
Reference circuit 200 is comprised of low pressure PMOS pipe PM1 and high voltage PMOS pipe M2, M3; The source of high voltage PMOS pipe M2 meets supply voltage VCC, and the grid end of drain terminal and grid end and high voltage PMOS pipe M3 links together and meets cascade tube grid end bias voltage VCAS, and reference current IB flows through high voltage PMOS pipe M2, produces cascade tube grid end bias voltage VCAS; The source of low pressure PMOS pipe PM1 meets supply voltage VCC, the drain terminal of grid end and high voltage PMOS pipe M3 links together and meets current mirror pipe grid end bias voltage VBIAS, drain terminal connects the source of high voltage PMOS pipe M3, and reference current IREF flows through low pressure PMOS pipe PM1 and high voltage PMOS pipe M3 generation current mirror pipe grid end bias voltage VBIAS.
Mirror image circuit 201 is comprised of low pressure PMOS pipe PM6, high voltage PMOS pipe M14, M15, M16, M17, M18; The source of low pressure PMOS pipe PM6 meets supply voltage VCC, the drain terminal of grid termination high voltage PMOS pipe M15, M16, and drain terminal connects the source of high voltage PMOS pipe M14; The grid termination high voltage PMOS pipe M17 of high voltage PMOS pipe M14, the drain terminal of M18, drain terminal meets current source output terminal IOUT; Wherein, low pressure PMOS pipe PM6 is the current mirror pipe, high voltage PMOS pipe M14 is cascade tube, high voltage PMOS pipe M15, M16, M17, M18 are switching tube, high voltage PMOS pipe M15, M16 form an either-or switch, be used for controlling the grid terminal voltage of low-voltage current mirror pipe PM6, high voltage PMOS pipe M17, M18 form an either-or switch, are used for controlling the grid terminal voltage of high pressure stage union M14.
B＜0〉with BN＜0 anti-phase, be switch controlling signal, B＜0〉meet supply voltage VCC, be logical one, BN＜0〉ground connection, be logical zero, M15 conducting, M16 cut-off, low-voltage current mirror pipe PM6 grid termination power voltage VCC, low-voltage current mirror pipe PM6 cut-off; M17 conducting, M18 cut-off, high pressure stage union M14 grid termination power voltage VCC, high-voltage tube M14 cut-off, mirror image circuit 201 no currents.B＜0〉ground connection, be logical zero, BN＜0〉and meet supply voltage VCC, be logical one, M15 cut-off, M16 conducting, low-voltage current mirror pipe PM6 grid termination current mirror pipe grid end bias voltage VBIAS, low-voltage current mirror pipe PM6 conducting; M17 cut-off, M18 conducting, high pressure stage union M14 grid termination cascade tube grid end bias voltage VCAS, high-voltage tube M14 conducting, mirror image circuit 201 access programmable current sources.
The type of mirror image circuit 201 mesolow current mirror pipe PM6 and reference current mesolow PMOS pipe PM1, measure-alike, the type of mirror image circuit 201 mesohigh cascade tube M14 and reference current mesohigh PMOS pipe M3, measure-alike, the size of mirror image circuit 201 output currents equals reference electric current I REF.Other mirror image circuit and mirror image circuit 201 are similar, are comprised of low pressure PMOS current mirror pipe, high voltage PMOS cascade tube, high voltage PMOS switching tube equally.The 2 road mirror image circuit is that mirror image circuit 201 copies 2 parts, and the electric current that flows through is 2*IREF, and switch controlling signal is B＜1〉and BN＜1; The 3 road mirror image circuit is that mirror image circuit 201 copies 2 2Part, the electric current that flows through is 2 2* IREF, switch controlling signal is B＜2〉and BN＜2; The rest may be inferred, and i+1 road mirror image circuit is that mirror image circuit 201 copies 2 iPart, the electric current that flows through is 2 i* IREF, switch controlling signal is B＜i〉and BN＜i, wherein, between i desirable 0 to 7 and comprise 0 and 7 integer.B＜i〉be logical one, BN＜i〉be logical zero, i+1 road mirror image circuit does not access programmable current source; B＜i〉be logical zero, BN＜i〉be logical one, i+1 road mirror image circuit access programmable current source.The total output current Iout of programmable current source is:
Iout=IREF*(BN<0>+BN<1>*2+BN<2>*4+BN<3>*2 3+BN<4>*2 4+BN<5>*2 5+BN<6>*2 6+?BN<7>*2 7)
Control signal B＜i〉get different values, the value of the output current Iout of programmable current source is different.B＜i〉be " 1 ", i.e. BN＜i entirely be " 0 " entirely, the value of Iout is minimum, is 0; B＜i〉be " 0 ", i.e. BN＜i entirely be " 1 " entirely, the value of Iout is maximum, is 255*IREF.By B＜i〉different values, the value of Iout can change between 0 ~ 255*IREF, the minimum interval is IREF.If the accuracy requirement of programmable current source is higher, dynamic range is larger, and current minimum interval IREF and 8 bit change scopes are not enough to meet the demands, the figure place of the value of capable of regulating reference electric current I REF, increase mirror image circuit and switch controlling signal.Can cause like this area of domain and the increase of placement-and-routing's difficulty.
holding circuit 202 is comprised of high voltage PMOS pipe M4, M5, is connected across between the source and grid end of low pressure PMOS pipe PM1, the source of high voltage PMOS pipe M4 meets supply voltage VCC, and drain terminal and grid end are linked the source of high voltage PMOS pipe M5, the drain terminal of high voltage PMOS pipe M5 and grid end connect together and meet current mirror pipe grid end bias voltage VBIAS, during normal operation, the pressure drop of low pressure PMOS pipe PM1 source and grid end is less, trigger voltage lower than holding circuit 202, high voltage PMOS pipe M4, M5 is in cut-off state, do not affect the work of current source, powered on moment in programmable current source work, if low pressure PMOS pipe PM1 source, the grid side pressure is poor excessive, the trigger voltage that surpasses holding circuit 202, high voltage PMOS pipe M4, the M5 conducting, to low pressure PMOS pipe PM1 source, the poor clamp that carries out of grid terminal voltage, gate oxide with protection low pressure PMOS pipe PM1 can be not breakdown, simultaneously, in the situation that selector switch is opened, holding circuit 202 can protect the gate oxide of the low-voltage current mirror pipe of mirror image circuit can be not breakdown, after circuit is stable, return to normal operating conditions, holding circuit 202 quits work.
The structure of holding circuit 203 is identical with the structure of holding circuit 202; formed by the high voltage PMOS pipe equally; both principle of work is also similar; difference is: holding circuit 203 clamps be source and the drain terminal voltage difference of mirror image circuit mesolow current mirror pipe, can be not breakdown with source, the drain terminal of protection low-voltage current mirror pipe.

Claims (1)

1. one kind high amplitude of oscillation programmable current source, is characterized in that comprising reference circuit, mirror image circuit, holding circuit;
Described reference circuit is comprised of the first low pressure PMOS pipe and first and second high voltage PMOS pipe; The source of the first high voltage PMOS pipe connects supply voltage, and the grid end of drain terminal and grid end and the second high voltage PMOS pipe links together and connects cascade tube grid end bias voltage; The source of the first low pressure PMOS pipe connects supply voltage, and the drain terminal of grid end and the second high voltage PMOS pipe links together and connects current mirror pipe grid end bias voltage, and drain terminal connects the source of the second high voltage PMOS pipe;
Described mirror image circuit by the second low pressure PMOS manage, third and fourth, five, six, seven high voltage PMOS pipes form; The source of the second low pressure PMOS pipe connects supply voltage, and the drain terminal of grid termination fourth, fifth high voltage PMOS pipe, drain terminal connect the source that third high is pressed the PMOS pipe; Third high is pressed the grid termination the 6th of PMOS pipe, the drain terminal of seven high voltage PMOS pipes, and drain terminal connects current source output;
Described holding circuit is comprised of the 8th, nine high voltage PMOS pipes, is connected across between the source and grid end of the second low pressure PMOS pipe; The source of the 8th high voltage PMOS pipe connects supply voltage, and drain terminal and grid end are linked the source of the 9th high voltage PMOS pipe; The drain terminal of the 9th high voltage PMOS pipe and grid end connect together and connect current mirror pipe grid end bias voltage.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI661292B (en) * 2017-06-01 2019-06-01 新唐科技股份有限公司 Electronic circuit and method of current mirror array

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5680038A (en) * 1996-06-20 1997-10-21 Lsi Logic Corporation High-swing cascode current mirror
EP1229656A2 (en) * 2001-02-02 2002-08-07 Broadcom Corporation Low power, charge injection compensated charge pump
US7365593B1 (en) * 2006-01-11 2008-04-29 Xilinx, Inc. Output equalized charge pump
EP2284841A1 (en) * 2009-07-14 2011-02-16 Raytheon Company Programmable efuse and sense circuit
CN102043420A (en) * 2009-10-12 2011-05-04 台湾积体电路制造股份有限公司 Programmable current mirror
CN203133656U (en) * 2013-02-11 2013-08-14 湖南融和微电子有限公司 High-oscillation-amplitude programmable current source

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5680038A (en) * 1996-06-20 1997-10-21 Lsi Logic Corporation High-swing cascode current mirror
EP1229656A2 (en) * 2001-02-02 2002-08-07 Broadcom Corporation Low power, charge injection compensated charge pump
US7365593B1 (en) * 2006-01-11 2008-04-29 Xilinx, Inc. Output equalized charge pump
EP2284841A1 (en) * 2009-07-14 2011-02-16 Raytheon Company Programmable efuse and sense circuit
CN102043420A (en) * 2009-10-12 2011-05-04 台湾积体电路制造股份有限公司 Programmable current mirror
CN203133656U (en) * 2013-02-11 2013-08-14 湖南融和微电子有限公司 High-oscillation-amplitude programmable current source

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI661292B (en) * 2017-06-01 2019-06-01 新唐科技股份有限公司 Electronic circuit and method of current mirror array

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