CN106502298A - One kind is applied to current generating circuit in low pressure phase interpolator - Google Patents
One kind is applied to current generating circuit in low pressure phase interpolator Download PDFInfo
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- CN106502298A CN106502298A CN201611181651.0A CN201611181651A CN106502298A CN 106502298 A CN106502298 A CN 106502298A CN 201611181651 A CN201611181651 A CN 201611181651A CN 106502298 A CN106502298 A CN 106502298A
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- current
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- electric current
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
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- Electromagnetism (AREA)
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- Automation & Control Theory (AREA)
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Abstract
The invention provides a kind of electric current generation technology.More specifically, the invention provides being applied to current generating circuit in low pressure phase interpolator.It is characterized in that：Including phase quantization DAC-circuit, current converter；Phase quantization DAC-circuit output voltage is used for control electric current transducer, and the electric current that current converter is produced is controlling follow-up phase blender.The linearity that current generating circuit in phase interpolator can be greatly improved phase interpolator is applied to by proposed by the invention, with important using value.
Description
Technical field
The present invention relates to a kind of electric current generation technology.More particularly it relates to be applied in low pressure phase interpolator
Current generating circuit.
Background technology
With the continuous development of information technology, high density calculating, network service, intensive image procossing, mass data transfers
Deng requirement more and more higher of the application to message transmission rate, in order to improve the traffic rate of chip chamber, have developed in the world multiple
High speed transport protocols, data bandwidth up to number Gbps even ten number Gbps.These high speed protocols are mostly using the side of serial communication
Formula, and clock lain in data, be there is no longer single clock line, is therefore accomplished by a clock and data recovery in receiving terminal
Circuit, correctly to extract data.The implementation method of clock and data recovery is a lot, is such as based on PHASE-LOCKED LOOP PLL TECHNIQUE, based on multi-phase clock
Data oversampling method and phase-interpolation method, wherein phase-interpolation is owned by France in digital dock data recovery technique, its simple structure,
It is easily integrated, cost is relatively low, performance more preferably, is more suitable for business application.Phase interpolator is the clock number based on phase-interpolation method
According to the key modules of restoring circuit, its performance is directly connected to the performance of whole clock and data recovery circuit, phase-interpolation
The non-linear dynamic characteristic that can directly affect clock data recovery circuit of device, when input data and local clock have difference on the frequency
When, can also affect its jitter toleration.
With the development of microelectric technique, in order to realize higher message transmission rate, the chip manufacturing work that people adopt
Skill is more advanced, and running voltage is lower, proposes more challenges to circuit design.At low supply voltages, lead to from power supply to ground
The pipe number that can connect on road is fewer and feweri, and this proposes challenge to phase interpolation circuit.Phase in phase interpolation circuit
Position blender using differential pair tube and connects a tail current source capsule below, due to the reduction of supply voltage, phase interpolator
The common mode electrical level of differential pair tube reduces, and it is less and less that the overdrive voltage of tail current source capsule can be designed, and its drain terminal voltage will
Be less than grid end voltage, and the impact along with channel modulation effect, current mirror precision worse and worse, in different technique,
Voltage, under temperature combined situation, electric current adaptation reaches as high as 30%, and this has had a strong impact on the performance of phase interpolator.
The present invention is directed to low pressure deep submicron process technology, it is proposed that a kind of circuit for carrying high current mathing accuracy, uses
Produce in the electric current of phase interpolator, it will the performance of phase interpolator is greatly improved.
Content of the invention
It is an object of the invention to provide a kind of current generator for phase interpolator, for improving phase interpolator electricity
Stream matching precision.
One kind is applied to current generating circuit in low pressure phase interpolator, and including phase quantization DAC-circuit, electric current is changed
Device：
Phase quantization DAC-circuit realizes the voltage signal that digital coding is converted to simulation；
Current converter is realized for voltage signal being converted to current signal；
Front stage circuits are input into N positions to phase quantization DAC-circuit, and phase quantization DAC-circuit output voltage is used for controlling electricity
Stream transformer, the electric current that current converter is produced is controlling follow-up phase blender；
Wherein current converter includes operational amplifier, common-source stage transistor, regulation pipe, mirror image resistance；
Regulation pipe wherein described in current converter is identical with 2 times of subsequent phase blender differential pair tube size；
Wherein mirror image resistance value is equal to the half of load resistance in phase blender, and type is identical；
Wherein phase quantization DAC-circuit adopts structure of current rudder, and its resistance is identical with current converter resistance sizes, resistance
Type is also identical.
The proposed by the invention current generating circuit simple structure for being applied to phase interpolator, in low pressure deep-submicron work
Under skill, service behaviour is good, and can give phase blender tail current source one linearity of offer preferable electric current, and the electric current is received
The impact of temperature, supply voltage and technique is less.
Description of the drawings
Fig. 1 is the current generating circuit structure chart for being applied to phase interpolator；
Fig. 2 is phase quantization DAC-circuit structure chart；
Fig. 3 is current converter circuit structure chart.
Specific embodiment
The following examples can make those skilled in the art that the present invention is more fully understood, but limit never in any form
The present invention.
For making the object, technical solutions and advantages of the present invention clearer, the present invention is done in detail below in conjunction with accompanying drawing
Description.
Refer to Fig. 1, Fig. 1 is the current generating circuit structure chart for being applied to phase interpolator, application of the present invention
In phase interpolator, current generating circuit 100 includes that phase quantization DAC-circuit (hereinafter referred to as DAC-circuit) 200, electric current are changed
Device 300.Front stage circuits are given the current generating circuit 100 of phase interpolator, 100 basis of current generating circuit by N positions input code 500
N positions input code 500 produces corresponding electric current 700 to phase blender 400, produces accordingly so as to control phase blender 400
Output signal.The present invention controls the electric current of phase blender 400 by current generating circuit, realizes being controlled by N positions input code 500
System obtains the signal of out of phase output, and realize will be circuitry digitizing, to reduce design complexities, improve level of integrated system and
Systematic function.
Fig. 2 is referred to, Fig. 2 is the structure chart of phase quantization DAC-circuit 200, using structure of current rudder, the structure has knot
Structure is simple, and the linearity is good, the features such as speed is fast.DAC-circuit of the present invention 200 includes temperature code 201, current switch 202,
Output resistance R1205, R2206.N positions input code 500 is encoded by temperature code 201, produces 2N-2-1Individual thermometer code, goes to select electric current
Switch 202, current switch 202 is controlled by resistance R by opening or closing its current value1205, R2206 current value point
Wei not IDACP, IDACN, so as in R1205, R2Produce voltage on 206 respectively and be respectively IDACP*R1, IDACN* R2, so that produce output
Voltage Vrefp204, Vrefn203 is Vdd-IDACP*R1,Vdd-IDACN*R2.Voltage Vrefp204, Vrefn203 are used for controlling next stage electricity
300 circuit of stream transformer.Resistance R1205, R2206 resistance value and the selection of resistance type will coordinate next stage current converter
300 circuits, to realize the accurately mate of electric current.
The structure of current converter 300 as shown in figure 3, it includes two identical current converter structures 309,310, because
This, we only carry out expansion description to current converter module 309.Current converter 309 is by difference amplifier 301, common-source stage
Transistor M3307, regulation pipe M1305, mirror image resistance R3303 compositions.Common-source stage transistor M3307, regulation pipe M1305, resistance
R3The sign-changing amplifier of 303 one single ended input Single-end output of composition, constitutes a closed loop electricity together with difference amplifier 301
Road.In design, the closed-loop will take into full account its stability, and phase margin is designed as more than or equal to 60 degree.The closed loop
Circuit makes two input port level of difference amplifier 301 identical, while the gain of difference amplifier 301 is at least greater than
60dB, so that flow through R3303 electric current is (Vdd-Vrefp)/R3, that is to say and flow through transistor M3307 current value, due to stream
Cross the tail current source capsule M of phase blender 4004401 electric current with flow through mirrored transistor M3307 current value is identical, so as to produce
The tail current value of raw phase blender 400 is (Vdd-Vrefp)/R3.Transistor M1305 differences for being used for matched-phase blender 400
Divide to pipe, 2 times for 400 differential pair tube size of phase blender of its size, resistance R3303 is that phase blender 400 is single-ended negative
1/2nd of resistance are carried, so that the tail current source capsule M of phase blender 4004401 drain terminal level and transistor M3307
Drain terminal level is consistent, so that current mirror mismatch is minimized.
In sum, the tail current value of phase blender can use equation below 1,2 to describe：
The present invention can also pass through to adjust R1With R3, R2With R4Ratio, reduce IDACPWith IDACNSize obtaining identical
IaWith IbValue, so as to reduce system power dissipation.
The proposed by the invention current generating circuit simple structure for being applied to phase interpolator, in low pressure deep-submicron work
Under skill, service behaviour is good, and can give phase blender tail current source one linearity of offer preferable electric current, and the electric current is received
The impact of temperature, supply voltage and technique is less.Therefore, the proposed by the invention electric current in phase interpolator that is applied to produces electricity
Road can be greatly improved the linearity of phase interpolator, with important using value.
Foregoing has outlined the feature of embodiment so that those skilled in the art may be better understood the aspect of the present invention.
Many can also be constituted in the case of without departing from the spirit and scope of the present invention the embodiment of very big difference.It should be appreciated that
Except as defined by the appended claims, the invention is not restricted to specific embodiment described in the description.
Claims (9)
1. one kind is applied to current generating circuit in low pressure phase interpolator, it is characterised in that：Including phase quantization DAC-circuit,
Current converter：
Phase quantization DAC-circuit realizes the voltage signal that digital coding is converted to simulation；
Current converter is realized for voltage signal being converted to current signal；
Front stage circuits are input into N positions to phase quantization DAC-circuit, and phase quantization DAC-circuit output voltage turns for control electric current
Parallel operation, the electric current that current converter is produced is controlling follow-up phase blender.
2. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
Transducer is made up of two structure identical current converters.
3. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
The electric current reforming unit of transducer includes operational amplifier, common-source stage transistor, regulation pipe, mirror image resistance.
4. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
Common-source stage transistor, regulation pipe described in the electric current reforming unit of transducer, resistance constitute a single ended input Single-end output
Sign-changing amplifier, constitutes a closed loop circuit together with the difference amplifier；Described closed-loop phase margin more than etc.
In 60 degree.
5. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
Regulation pipe described in transducer is identical with 2 times of subsequent phase blender differential pair tube size.
6. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
Mirror image resistance value described in transducer is equal to the half of load resistance in phase blender, and type is identical.
7. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described electric current
Op-amp gain described in transducer is at least above 60dB.
8. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described phase place
Quantifying DAC-circuit includes temperature code device, current switch and 2 output resistances.
9. according to claim 1 current generating circuit in phase interpolator is applied to, it is characterised in that：Described phase place
Quantify DAC-circuit and adopt structure of current rudder, the resistance of DAC-circuit is identical with the resistance sizes of the current converter, type
Identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611181651.0A CN106502298B (en) | 2016-12-20 | 2016-12-20 | One kind is applied to current generating circuit in low pressure phase interpolator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611181651.0A CN106502298B (en) | 2016-12-20 | 2016-12-20 | One kind is applied to current generating circuit in low pressure phase interpolator |
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| Publication Number | Publication Date |
|---|---|
| CN106502298A true CN106502298A (en) | 2017-03-15 |
| CN106502298B CN106502298B (en) | 2017-11-14 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1846355A (en) * | 2003-10-30 | 2006-10-11 | 因芬尼昂技术股份公司 | Delayed locked loop phase blender circuit |
| US20070063741A1 (en) * | 2005-09-22 | 2007-03-22 | Tarango Tony M | Testing of integrated circuit receivers |
| CN101084626A (en) * | 2004-12-20 | 2007-12-05 | 英特尔公司 | Mechanism to aid a phase interpolator in recovering a clock signal |
| CN101310440A (en) * | 2005-12-27 | 2008-11-19 | 英特尔公司 | Phase interpolator |
| US20130271193A1 (en) * | 2012-04-13 | 2013-10-17 | Intersil Americas LLC | Circuits and methods to guarantee lock in delay locked loops and avoid harmonic locking |
-
2016
- 2016-12-20 CN CN201611181651.0A patent/CN106502298B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1846355A (en) * | 2003-10-30 | 2006-10-11 | 因芬尼昂技术股份公司 | Delayed locked loop phase blender circuit |
| CN101084626A (en) * | 2004-12-20 | 2007-12-05 | 英特尔公司 | Mechanism to aid a phase interpolator in recovering a clock signal |
| US20070063741A1 (en) * | 2005-09-22 | 2007-03-22 | Tarango Tony M | Testing of integrated circuit receivers |
| CN101310440A (en) * | 2005-12-27 | 2008-11-19 | 英特尔公司 | Phase interpolator |
| US20130271193A1 (en) * | 2012-04-13 | 2013-10-17 | Intersil Americas LLC | Circuits and methods to guarantee lock in delay locked loops and avoid harmonic locking |
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| Publication number | Publication date |
|---|---|
| CN106502298B (en) | 2017-11-14 |
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