CN106027057B - A kind of rail-to-rail current output switch - Google Patents
A kind of rail-to-rail current output switch Download PDFInfo
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- CN106027057B CN106027057B CN201610338082.XA CN201610338082A CN106027057B CN 106027057 B CN106027057 B CN 106027057B CN 201610338082 A CN201610338082 A CN 201610338082A CN 106027057 B CN106027057 B CN 106027057B
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- current
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- pmos
- nmos
- balun
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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
Abstract
The present invention provides a kind of rail-to-rail current output switch, including PMOS current switch and NMOS current switch, further includes the first BALUN and the 2nd BALUN, and PMOS current switch and NMOS current switch add identical difference cmos signal；Difference cmos signal is converted into the first differential current signal by PMOS current switch, and the first differential current signal is converted into the first single-ended signal and exported by the first BALUN, 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 second differential current signal is converted into the second single-ended signal and exported by the 2nd BALUN, and NMOS current switch completes power rail output.The present invention proposes a kind of new current switch structure, and relative to original current switching circuit, the circuit output amplitude of oscillation of the invention is bigger, is able to achieve rail-to-rail output.
Description
Technical field
The present invention relates to belong to semiconductor integrated circuit technology field, and in particular to a kind of rail-to-rail current output switch,
It is mainly used in high-speed DAC converter circuit.
Background technique
The bridge of signal transmitting, and analog-digital converter (ADC) and digital-to-analogue conversion are erected between simulation and number
Device (DAC) is exactly such a essential interface circuit.
Under many typical cases, such as wired or wireless telecommunications, video frequency signal processing, Direct Digital Synthesis
Deng the performance of high-speed, high precision converter has been largely fixed the performance of whole system, especially in high speed communication field, turns
The performance of parallel operation possibly even becomes the bottleneck of systematic entirety energy.
In the DAC of numerous types, the structure of electric current boat DAC determines its high-speed, high precision characteristic come with raw Ju.It
It is usually made of one group of current source and corresponding current switch, the current switch of difference is just as steering engine according to the signal of input
By conduct current positive or reversed-phase output.Signal before current switch belongs to digital signal scope, opens through overcurrent
Digital signal transition is at analog signal behind pass.Current switch is the bridge of numeric field and analog domain in DAC, its performance to DAC
There is conclusive influence.
Traditional current switching circuit is generally used for the output end of high-speed DAC, including two PMOS tube, and two PMOS tube are only
The flow direction for playing on-off action switching electric current, does not change total current size, this current switch operating rate quickly, but output voltage
The amplitude of oscillation is limited, for high-speed DAC, cannot achieve rail-to-rail output.
Summary of the invention
In consideration of it, the object of the present invention is to provide a kind of rail-to-rail current output switch, which can be improved
The output voltage swing of DAC.
What the purpose of the present invention was realized by following technical solution: a kind of rail-to-rail current output switch, including PMOS
Current switch and NMOS current switch further include the first BALUN and the 2nd BALUN, PMOS current switch and NMOS current switch
Add identical difference cmos signal；
Difference cmos signal is converted into the first differential current signal by PMOS current switch, and the first BALUN is by the first difference
Current signal is converted into the output of the first single-ended signal, 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 output of the second single-ended signal, and NMOS current switch completes power rail output.
Further, the PMOS current switch include the first PMOS tube, the second PMOS tube, first resistor, second resistance and
One end of current source, the current source connects to power supply, the other end of current source respectively with the source electrode of the first PMOS tube, second
The source electrode of PMOS tube connects, and the drain electrode of first PMOS tube is grounded through first resistor, and the drain electrode of second PMOS tube is through the
The drain electrode of two resistance eutral groundings, first PMOS tube is connect with the anode of the first BALUN, the drain electrode of the second PMOS tube and first
The negative terminal of BALUN connects, and the grid input signal of the grid input signal of the first PMOS tube and the second PMOS tube each other believe by difference
Number；Output port of the output end of first BALUN as PMOS current switch.
Further, the NMOS current switch include the first NMOS tube, the second NMOS tube, 3rd resistor, the 4th resistance and
Electric current is heavy, the heavy one end ground connection of the electric current, the heavy other end of electric current respectively with the source electrode of the first NMOS tube, the second NMOS tube
Source electrode connection；The drain electrode of first NMOS tube is connected to power supply through 3rd resistor, and the drain electrode of second NMOS tube is through the 4th
Resistance connects to power supply, and the drain electrode of first NMOS tube is connect with the anode of the 2nd BALUN, the drain electrode of second NMOS tube
It is connect with the negative terminal of the 2nd BALUN, the grid input signal of the grid input signal of the first NMOS tube and the second NMOS tube is each other
Differential signal；Output port of the output end of 2nd BALUN as NMOS current switch.
Due to using above technical scheme, the present invention has following advantageous effects:
The present invention proposes a kind of new current switch structure, relative to original current switching circuit, circuit of the invention
Output voltage swing is bigger, is able to achieve rail-to-rail output.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
The detailed description of one step, in which:
Fig. 1 is current switching circuit figure proposed by the present invention.
Specific embodiment
Below with reference to attached drawing, a preferred embodiment of the present invention will be described in detail；It should be appreciated that preferred embodiment
Only for illustrating the present invention, rather than limiting the scope of protection of the present invention.
A kind of rail-to-rail current output switch, including PMOS current switch C1, the first BALUN, NMOS current switch C2 and
2nd BALUN.
PMOS current switch C1 include the first PMOS tube MP1, the first PMOS tube MP2, first resistor R1, second resistance R2 and
Current source I1.PMOS current switch C1 further includes input port D and DN, output port OUTN.
NMOS current switch C2 include the first NMOS tube MN1, the second NMOS tube MN2,3rd resistor R3, the 4th resistance R4 and
Electric current sinks I2.NMOS current switch C2 further includes input port D and DN, output port OUTP.
Below for convenience, PMOS current switch is replaced with C1, NMOS current switch is replaced with C2, by first
PMOS tube is replaced with MP1, similarly to the referred to as replacement of other electrical components.
For C1, one end of current source I1 is connected with power supply, the other end source electrode phase with the source electrode of MP1, MP2 respectively
Even；The grid of MP1 is connected with port D, and the grid of MP2 is connected with input port DN；One end of resistance R1 is grounded, other end difference
It is connected with the anode of the drain electrode of MP1, the first BALUN；One end of resistance R2 is grounded, the other end respectively with the drain electrode of MP2, first
The negative terminal of BALUN is connected；The output of first BALUN terminates port OUTN.The grid input signal of MP1 and the grid of MP2 input
Signal differential signal each other.
For C2, one end of the heavy I2 of electric current is connected to the ground, and the other end is connected with the source electrode of MN1, MN2；The grid of MN1 with
Port D is connected, and the grid of MN2 is connected with port DN；A termination power of resistance R3, the drain electrode of the other end and MN1, BALUN2
Anode is connected；A termination power of resistance R4, the other end are connected with the negative terminal of the drain electrode of MN2, BALUN2；The output end of BALUN2
Meet port OUTP.The grid input signal of MN1 and the grid input signal of MN2 differential signal each other
The working principle of lower surface analysis once C1, the end D and DN is typically sent to difference cmos signal.
When D is sent into high level, DN is sent into low level, MP1 cut-off, MP2 is connected, and the electric current of constant-current source I1 all flows through
No current flows through in MP2, MP1, and signal is transformed into voltage signal after electric current flows through R2, and differential signal is converted into single-ended by BALUN1
Signal, OUTN output are low.
When D is sent into low level, DN is sent into high level, MP1 conducting, MP2 ends, and the electric current of constant-current source I1 all flows through
No current flows through in MP1, MP2, and signal is transformed into voltage signal after electric current flows through R1, and differential signal is converted by the first BALUN
Single-ended signal, OUTN output are height.
MP1 and MP2 always has a conducting, and for constant-current source, electric current is never turned off.Nodes X will not undergo from 0 and open in this way
The charge and discharge process of beginning.Corresponding X point voltage is almost motionless.MP1 and MP2 is only responsible for switching electric current, but it is total not change output
The current switch operating rate of the size of electric current, this structure is very high.Due to being PMOS current switch, C1 realization common mode is in track
Neighbouring swing.
It is corresponding, it can analyze the working principle of C2, the end D and DN is typically sent to difference cmos signal.
When D is sent into high level, DN is sent into low level, the electric current of MN1 conducting, MP2 cut-off, the heavy I2 of constant current all flows through
No current flows through in MN1, MN2, and signal is transformed into voltage signal after electric current flows through R3, and differential signal is converted by the 2nd BALUN
Single-ended signal, OUTP output are low.
When D is sent into low level, DN is sent into high level, the electric current of MN1 cut-off, MP2 conducting, the heavy I2 of constant current all flows through
No current flows through in MN2, MN1, and signal is transformed into voltage signal after electric current flows through R4, and differential signal is converted by the 2nd BALUN
Single-ended signal, OUTP output are height.
MN1 and MN2 always has a conducting, and for constant-current source, electric current is never turned off.Node Y will not undergo from 0 and open in this way
The charge and discharge process of beginning.Corresponding X point voltage is almost motionless.MN1 and MN2 is only responsible for switching electric current, but it is total not change output
The current switch operating rate of the size of electric current, this structure is very high.Due to being NMOS current switch, C2 realization common mode is in power supply
Swing near rail.
C1 and C2 combine, and can be achieved with the output of power rail to track.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, it is clear that those skilled in the art
Various changes and modifications can be made to the invention by member without departing from the spirit and scope of the present invention.If in this way, of the invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to encompass these to these modifications and variations
Including modification and variation.
Claims (1)
1. a kind of rail-to-rail current output switch, it is characterised in that: including PMOS current switch and NMOS current switch, further include
First BALUN and the 2nd BALUN, PMOS current switch and NMOS current switch add identical difference cmos signal；
Difference cmos signal is converted into the first differential current signal by PMOS current switch, and the first BALUN is by the first difference current
Signal is converted into the output of the first single-ended signal, 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 output of the second single-ended signal, and NMOS current switch completes power rail output；
The PMOS current switch includes the first PMOS tube, the second PMOS tube, first resistor, second resistance and current source I1, institute
The one end for stating current source I1 connects to power supply, the other end of current source I1 respectively with the source electrode of the first PMOS tube, the second PMOS tube
Source electrode connection, the drain electrode of first PMOS tube is grounded through first resistor, and the drain electrode of second PMOS tube is through second resistance
Ground connection, the drain electrode of first PMOS tube are connect with the anode of the first BALUN, and the drain electrode of the second PMOS tube is with the first BALUN's
The grid input signal of negative terminal connection, the grid input signal of the first PMOS tube and the second PMOS tube differential signal each other；It is described
Output port of the output end of first BALUN as PMOS current switch；
The NMOS current switch includes that the first NMOS tube, the second NMOS tube, 3rd resistor, the 4th resistance and electric current are heavy, described
The heavy one end ground connection of electric current, the heavy other end of electric current are connect with the source electrode of the source electrode of the first NMOS tube, the second NMOS tube respectively；Institute
The drain electrode for stating the first NMOS tube is connected to power supply through 3rd resistor, and the drain electrode of second NMOS tube connects through the 4th resistance and power supply
It connects, the drain electrode of first NMOS tube is connect with the anode of the 2nd BALUN, the drain electrode of second NMOS tube and the 2nd BALUN
Negative terminal connection, the grid input signal of the grid input signal of the first NMOS tube and the second NMOS tube differential signal each other；Institute
State output port of the output end of the 2nd BALUN as NMOS current switch.
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 |
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| Publication Number | Publication Date |
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| CN106027057A CN106027057A (en) | 2016-10-12 |
| CN106027057B true CN106027057B (en) | 2019-03-26 |
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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 |
|---|
| 《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》;薛晓博;《中国博士学位论文全文数据库（电子期刊）信息科技辑》;20140715;第2014年卷(第7期);I135-27 |
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| CN106027057A (en) | 2016-10-12 |
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