CN106027057A - Rail-to-rail current output switch - Google Patents
Rail-to-rail current output switch Download PDFInfo
- Publication number
- CN106027057A CN106027057A CN201610338082.XA CN201610338082A CN106027057A CN 106027057 A CN106027057 A CN 106027057A CN 201610338082 A CN201610338082 A CN 201610338082A CN 106027057 A CN106027057 A CN 106027057A
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- Prior art keywords
- current
- pmos
- balun
- rail
- switch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a rail-to-rail current output switch. The switch comprises a PMOS current switch, an NMOS current switch, a first BALUN and a second BALUN. Same differential CMOS signals are applied to the PMOS current switch and the NMOS current switch. The PMOS current switch converts the differential CMOS signals into first differential current signals. The first BALUN converts the first differential current signals into first single-end signals and outputs the first single-end signals. The PMOS current switch finishes ground rail output. The NMOS current switch converts the differential CMOS signals into second differential current signals. The second BALUN converts the second differential current signals into second single-end signals and outputs the second single-end signals. The NMOS current switch finishes power supply rail output. Compared with an original current switch circuit, the new current switch structure provided by the invention has the advantages that the output swing of the circuit is greater, and the rail-to-rail output is realized.
Description
Technical field
The present invention relates to belong to semiconductor integrated circuit technical field, be specifically related to a kind of rail-to-rail current output switch, it mainly should
In high-speed DAC converter circuit.
Background technology
Simulating the bridge erecting a signal transmission between numeral, and analog-digital converter (ADC) and digital to analog converter (DAC)
The requisite interface circuit of such a just.
Under many typical case's application, the most wired or wireless telecommunications, video frequency signal processing, Direct Digital Synthesis etc., at a high speed
The performance of high precision converter has been largely fixed the performance of whole system, especially in high speed communication field, and the performance of transducer
Possibly even become the bottleneck of systematic entirety energy.
In many eurypalynous DAC, the structures shape of electric current boat DAC its with high-speed, high precision characteristic from birth.It leads to
Chang Youyi group current source and corresponding current switch composition, the current switch of difference just as steering wheel according to input signal by electric current
Guide positive or reversed-phase output.Signal before current switch belongs to digital signal category, numeral letter after current switch
Number it is transformed into analogue signal.Current switch is numeric field and the bridge of analog domain in DAC, and the performance of DAC is had decisive by it
Impact.
Traditional current switching circuit is generally used for the outfan of high-speed DAC, and including two PMOS, two PMOS are only
Rise on-off action switching electric current the flow direction, do not change total current size, this current switch operating rate quickly, but output voltage pendulum
Limited, for high-speed DAC, it is impossible to realize rail-to-rail output.
Summary of the invention
In consideration of it, it is an object of the invention to provide a kind of rail-to-rail current output switch, this current output switch can improve DAC's
Output voltage swing.
The purpose of the present invention realizes by following technical solution: a kind of rail-to-rail current output switch, including PMOS electric current
Switch and NMOS current switch, also include a BALUN and the 2nd BALUN, PMOS current switch and NMOS electricity
Stream switch adds identical difference cmos signal；
Difference cmos signal is converted into the first differential current signal by PMOS current switch, and a BALUN is by the first difference
Current signal is converted into the first single-ended signal output, and PMOS current switch completes ground track output；
Difference cmos signal is converted into the second differential current signal by NMOS current switch, and the 2nd BALUN is by the second difference
Current signal is converted into the second single-ended signal output, and NMOS current switch completes power rail output.
Further, described PMOS current switch includes the first PMOS, the second PMOS, the first resistance, the second resistance
And current source, one end of described current source is connected with power supply, the other end of current source respectively with the source electrode of the first PMOS,
The source electrode of two PMOS connects, and the drain electrode of described first PMOS is through the first resistance eutral grounding, the leakage of described second PMOS
Pole the second resistance eutral grounding, the drain electrode of described first PMOS is connected with the anode of a BALUN, the second PMOS
Drain electrode is connected with the negative terminal of a BALUN, and the grid input signal of the first PMOS inputs with the grid of the second PMOS
Signal differential signal each other；The outfan of a described BALUN is as the output port of PMOS current switch.
Further, described NMOS current switch includes the first NMOS tube, the second NMOS tube, the 3rd resistance, the 4th electricity
Resistance and electric current sink, one end ground connection that described electric current is heavy, the heavy other end of electric current respectively with the source electrode of the first NMOS tube, second
The source electrode of NMOS tube connects；The drain electrode of described first NMOS tube is connected with power supply through the 3rd resistance, described second NMOS tube
Drain electrode be connected with power supply through the 4th resistance, the drain electrode of described first NMOS tube is connected with the anode of the 2nd BALUN, described
The drain electrode of the second NMOS tube is connected with the negative terminal of the 2nd BALUN, the grid input signal of the first NMOS tube and the 2nd NMOS
The grid input signal differential signal each other of pipe；The outfan of described 2nd BALUN is as the outfan of NMOS current switch
Mouthful.
Owing to have employed above technical scheme, the present invention has a following Advantageous Effects:
The present invention proposes a kind of new current switch structure, relative to original current switching circuit, the circuit output voltage swing of the present invention
Bigger, rail-to-rail output can be realized.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the present invention is made the most in detail
Thin description, wherein:
Fig. 1 is the current switching circuit figure that the present invention proposes.
Detailed description of the invention
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail；Should be appreciated that preferred embodiment only for
The present invention is described rather than in order to limit the scope of the invention.
A kind of rail-to-rail current output switch, including PMOS current switch C1, BALUN, NMOS current switch C2
With the 2nd BALUN.
PMOS current switch C1 includes the first PMOS MP1, the first PMOS MP2, the first resistance R1, the second electricity
Resistance R2 and current source I1.PMOS current switch C1 also includes input port D and DN, output port OUTN.
NMOS current switch C2 include the first NMOS tube MN1, the second NMOS tube MN2, the 3rd resistance R3, the 4th
Resistance R4 and electric current sink I2.NMOS current switch C2 also includes input port D and DN, output port OUTP.
Hereinafter for convenience, PMOS current switch C1 is replaced, NMOS current switch C2 is replaced, by the
One PMOS MP1 replaces, and in like manner replaces other electrical equipment with abbreviation.
For C1, one end of current source I1 is connected with power supply, and the other end is connected with the source electrode of MP1, the source electrode of MP2 respectively；
The grid of MP1 is connected with port D, and the grid of MP2 is connected with input port DN；One end ground connection of resistance R1, the other end
It is connected with drain electrode, the anode of a BALUN of MP1 respectively；One end ground connection of resistance R2, the other end is respectively with MP2's
Drain electrode, the negative terminal of a BALUN are connected；The output termination port OUTN of the oneth BALUN.The grid input letter of MP1
Number with the grid input signal differential signal each other of MP2.
For C2, electric current sinks one end of I2 and is connected to the ground, and the other end is connected with the source electrode of MN1, MN2；The grid of MN1
Being connected with port D, the grid of MN2 is connected with port DN；One termination power of resistance R3, the other end and the drain electrode of MN1,
The anode of BALUN2 is connected；One termination power of resistance R4, the other end is connected with the drain electrode of MN2, the negative terminal of BALUN2；
The output termination port OUTP of BALUN2.The grid input signal of MN1 and the grid input signal differential signal each other of MN2
The operation principle of lower surface analysis C1 once, D and DN end is typically sent to difference cmos signal.
When D sends into high level, DN feeding low level, MP1 ends, and MP2 turns on, and the electric current of constant-current source I1 all flows through
In MP2, MP1, no current flows through, and after electric current flows through R2, signal is transformed into voltage signal, and differential signal is converted into by BALUN1
Single-ended signal, OUTN is output as low.
When D sends into low level, DN feeding high level, MP1 turns on, and MP2 ends, and the electric current of constant-current source I1 all flows through
In MP1, MP2, no current flows through, and after electric current flows through R1, signal is transformed into voltage signal, and differential signal is turned by a BALUN
Changing single-ended signal into, OUTN is output as height.
MP1 and MP2 always has a conducting, and for constant-current source, electric current never turns off.So nodes X will not experience and open from 0
The charge and discharge process begun.Corresponding X point voltage is the most motionless.MP1 and MP2 is only responsible for switching electric current, but does not change output
The size of total current, the current switch operating rate of this structure is the highest.Owing to being PMOS current switch, C1 realizes common mode and exists
Swing near track.
Corresponding, the operation principle of C2 can be analyzed, D and DN end is typically sent to difference cmos signal.
When D send into high level, DN send into low level time, MN1 turns on, and MP2 ends, and constant current is sunk the electric current of I2 and all flow through
In MN1, MN2, no current flows through, and after electric current flows through R3, signal is transformed into voltage signal, and differential signal is turned by the 2nd BALUN
Changing single-ended signal into, OUTP is output as low.
When D send into low level, DN send into high level time, MN1 ends, and MP2 turns on, and constant current is sunk the electric current of I2 and all flow through
In MN2, MN1, no current flows through, and after electric current flows through R4, signal is transformed into voltage signal, and differential signal is turned by the 2nd BALUN
Changing single-ended signal into, OUTP is output as height.
MN1 and MN2 always has a conducting, and for constant-current source, electric current never turns off.So node Y will not experience from 0
The charge and discharge process started.Corresponding X point voltage is the most motionless.MN1 and MN2 is only responsible for switching electric current, but does not changes
The size of output total current, the current switch operating rate of this structure is the highest.Owing to being NMOS current switch, C2 realizes altogether
Mould swing near power rail.
C1 and C2 combines, and can be achieved with the power rail output to track.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, it is clear that those skilled in the art is permissible
The present invention is carried out various change and modification without departing from the spirit and scope of the present invention.So, if the present invention these amendment and
Modification belongs within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these changes and modification exists
In.
Claims (3)
1. a rail-to-rail current output switch, it is characterised in that: include PMOS current switch and NMOS current switch, also wrap
Include a BALUN and the 2nd BALUN, PMOS current switch and NMOS current switch and add identical difference CMOS letter
Number；
Difference cmos signal is converted into the first differential current signal by PMOS current switch, and a BALUN is by the first difference current
Signal is converted into the first single-ended signal output, and PMOS current switch completes ground track output；
Difference cmos signal is converted into the second differential current signal by NMOS current switch, and the 2nd BALUN is by the second difference current
Signal is converted into the second single-ended signal output, and NMOS current switch completes power rail output.
Rail-to-rail current output switch the most according to claim 1, it is characterised in that: described PMOS current switch includes first
PMOS, the second PMOS, the first resistance, the second resistance and current source, one end of described current source is connected with power supply,
The other end of current source is connected with source electrode, the source electrode of the second PMOS of the first PMOS respectively, described first PMOS
Drain electrode through the first resistance eutral grounding, the drain electrode of described second PMOS is through the second resistance eutral grounding, the leakage of described first PMOS
Pole is connected with the anode of a BALUN, and the drain electrode of the second PMOS is connected with the negative terminal of a BALUN, a PMOS
The grid input signal of pipe and the grid input signal differential signal each other of the second PMOS；The output of a described BALUN
Hold the output port as PMOS current switch.
Rail-to-rail current output switch the most according to claim 1 and 2, it is characterised in that: described NMOS current switch bag
Include the first NMOS tube, the second NMOS tube, the 3rd resistance, the 4th resistance and electric current heavy, one end ground connection that described electric current is heavy,
The other end that electric current is heavy is connected with source electrode, the source electrode of the second NMOS tube of the first NMOS tube respectively；A described NMOS
The drain electrode of pipe is connected with power supply through the 3rd resistance, and the drain electrode of described second NMOS tube is connected with power supply through the 4th resistance, and described
The drain electrode of one NMOS tube is connected with the anode of the 2nd BALUN, and the drain electrode of described second NMOS tube is with the 2nd BALUN's
Negative terminal connects, the grid input signal of the first NMOS tube and the grid input signal differential signal each other of the second NMOS tube；Institute
State the outfan output port as NMOS current switch of the 2nd BALUN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610338082.XA CN106027057B (en) | 2016-05-19 | 2016-05-19 | A kind of rail-to-rail current output switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610338082.XA CN106027057B (en) | 2016-05-19 | 2016-05-19 | A kind of rail-to-rail current output switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106027057A true CN106027057A (en) | 2016-10-12 |
| CN106027057B CN106027057B (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610338082.XA Active CN106027057B (en) | 2016-05-19 | 2016-05-19 | A kind of rail-to-rail current output switch |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6833801B1 (en) * | 2003-12-01 | 2004-12-21 | Maxim Integrated Products, Inc. | Low distortion current switches for high speed current steering digital-to-analog converters |
| CN102388537A (en) * | 2011-07-25 | 2012-03-21 | 华为技术有限公司 | Analog-digital conversion unit circuit and analog-digital converter |
| CN104734720A (en) * | 2013-12-19 | 2015-06-24 | 美国亚德诺半导体公司 | Complementary switches in current switching digital to analog converters |
-
2016
- 2016-05-19 CN CN201610338082.XA patent/CN106027057B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6833801B1 (en) * | 2003-12-01 | 2004-12-21 | Maxim Integrated Products, Inc. | Low distortion current switches for high speed current steering digital-to-analog converters |
| CN102388537A (en) * | 2011-07-25 | 2012-03-21 | 华为技术有限公司 | Analog-digital conversion unit circuit and analog-digital converter |
| CN104734720A (en) * | 2013-12-19 | 2015-06-24 | 美国亚德诺半导体公司 | Complementary switches in current switching digital to analog converters |
Non-Patent Citations (1)
| Title |
|---|
| 薛晓博: "《高速高精度电流舵数模转换器关键设计技术的研究与实现》", 《中国博士学位论文全文数据库（电子期刊）信息科技辑》 * |
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| Publication number | Publication date |
|---|---|
| CN106027057B (en) | 2019-03-26 |
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