CN106502298B - 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
- Publication number
- CN106502298B CN106502298B CN201611181651.0A CN201611181651A CN106502298B CN 106502298 B CN106502298 B CN 106502298B CN 201611181651 A CN201611181651 A CN 201611181651A CN 106502298 B CN106502298 B CN 106502298B
- Authority
- CN
- China
- Prior art keywords
- phase
- current
- circuit
- converter
- generating circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a kind of electric current generation technology.More specifically, the invention provides 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 converter, and electric current caused by current converter controls follow-up phase blender.By the linearity that phase interpolator can be greatly improved applied to current generating circuit in phase interpolator proposed by the invention, there is important application value.
Description
Technical field
The present invention relates to a kind of electric current generation technology.More particularly it relates to 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 a variety of
High speed transport protocols, data bandwidth up to number Gbps even ten number Gbps.These high speed protocols mostly use the side of serial communication
Formula, and clock is lain in data, just needs a clock and data recovery there is no single clock line, therefore in receiving terminal
Circuit, correctly to extract data.The implementation method of clock and data recovery is a lot, such as PHASE-LOCKED LOOP PLL TECHNIQUE is based on, 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, and its is simple in construction,
It is easily integrated, cost is relatively low, and performance is more preferable, 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, it can also influence its jitter toleration.
With the development of microelectric technique, in order to realize higher message transmission rate, the chip manufacturing work that people use
Skill is more advanced, and operating voltage is lower, and more challenges are proposed to circuit design.At low supply voltages, lead to from power supply to ground
The pipe number that can be connected on road is fewer and fewer, and this proposes challenge to phase interpolation circuit.Phase in phase interpolation circuit
Position blender is 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 the overdrive voltage of tail current source capsule can be designed less and less, and its drain terminal voltage will
Less than grid end voltage, and along with the influence of 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
Produced in the electric current of phase interpolator, it will the performance of phase interpolator is greatly improved.
The 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
Flow matching precision.
One kind is applied to current generating circuit in low pressure phase interpolator, it is characterised in that：Including phase quantization DAC electricity
Road, current converter：
Phase quantization DAC-circuit realizes the voltage signal that digital coding is converted to simulation；
Current converter is realized is converted to current signal by voltage signal；
Front stage circuits, which input N positions input code to phase quantization DAC-circuit, phase quantization DAC-circuit output voltage, to be used for
Control electric current converter, electric current caused by current converter control follow-up phase blender, and N is the nature more than or equal to 2
Number.
Further, described current converter is made up of two structure identical current converters.
Further, the electric current reforming unit of described current converter includes operational amplifier, common-source stage transistor, adjusts
Section pipe, mirror image resistance.
Further, the common-source stage transistor described in the electric current reforming unit of described current converter, regulation pipe, mirror
As the sign-changing amplifier of resistance one single ended input Single-end output of composition, a closed loop electricity is formed together with the operational amplifier
Road；Described closed loop circuit phase margin is more than or equal to 60 degree.
Further, the regulation pipe size described in described current converter is subsequent phase blender differential pair tube chi
Very little 2 times.
Further, the value of the mirror image resistance described in described current converter is equal to load resistance in phase blender
Value half, and type is identical.
Further, the op-amp gain described in described current converter is at least above 60dB.
Further, described phase quantization DAC-circuit includes temperature code device, current switch and 2 output resistances.
Further, described phase quantization DAC-circuit uses structure of current rudder, the resistance of phase quantization DAC-circuit with
The resistance sizes of the current converter are identical, and type is also identical.Brief description of the drawings
Fig. 1 is the current generating circuit structure chart applied to phase interpolator；
Fig. 2 is phase quantization DAC-circuit structure chart；
Fig. 3 is current converter circuit structure chart.
Embodiment
The following examples can make those skilled in the art that the present invention be more fully understood, but not limit in any way
The present invention.
To make 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.
Referring to Fig. 1, Fig. 1 is the current generating circuit structure chart applied to phase interpolator, application of the present invention
Current generating circuit 100 includes phase quantization DAC-circuit (hereinafter referred to as DAC-circuit) 200, electric current conversion in phase interpolator
Device 300.Front stage circuits give N positions input code 500 current generating circuit 100 of phase interpolator, the basis of current generating circuit 100
N positions input code 500 produces corresponding electric current 700 to phase blender 400, so as to control phase blender 400 to produce accordingly
Output signal.The present invention controls the electric current of phase blender 400 by current generating circuit, realizes and is controlled by N positions input code 500
The signal that system obtains out of phase output is that realization will be circuitry digitizing, to reduce design complexities, improve level of integrated system and
Systematic function.
Referring to Fig. 2, Fig. 2 is the structure chart of phase quantization DAC-circuit 200, using structure of current rudder, the structure has knot
The features such as structure is simple, and the linearity is good, and speed is fast.DAC-circuit 200 of the present invention includes temperature code 201, current switch 202,
Output resistance R1205, R2206.Temperature code 201 encodes N positions input code 500, produces 2N-2- 1 thermometer code, go to select electric current
Switch 202, current switch 202 is by opening or closing its current value, to control by resistance R1205, R2206 current value point
Wei not IDACP, IDACN, so as in R1205, R2It is respectively I to produce voltage on 206 respectivelyDACP*R1, IDACN* R2, so as to produce output
Voltage Vrefp204, Vrefn203 be Vdd-IDACP*R1,Vdd-IDACN*R2.Voltage Vrefp204, Vrefn203 are used to control next stage electric
The circuit of stream transformer 300.Resistance R1205, R2The selection of 206 resistance value and resistance type will coordinate next stage current converter
300 circuits, to realize the accurate matching 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, forms 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 to be 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 flowing 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 is with flowing 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 are used for the difference of matched-phase blender 400
Divide to pipe, its size is 2 times of the differential pair tube size of phase blender 400, resistance R3303 be that phase blender 400 is single-ended negative
The half of resistance is 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 minimizes.
In summary, the tail current value of phase blender can use equation below 1,2 to describe：
The present invention also can be by adjusting R1With R3, R2With R4Ratio, reduce IDACPWith IDACNSize obtain identical
IaWith IbValue, so as to reduce system power dissipation.
Current generating circuit applied to phase interpolator proposed by the invention is simple in construction, in low pressure deep-submicron work
Service behaviour is good under skill, and can give phase blender tail current source provide a preferable electric current of the linearity, the electric current by
The influence of temperature, supply voltage and technique is smaller.Therefore, the electric current in phase interpolator that is applied to proposed by the invention produces electricity
The linearity of phase interpolator can be greatly improved in road, have important application value.
It foregoing has outlined the feature of embodiment so that the aspect of the present invention may be better understood in those skilled in the art.
Many embodiments for having very big difference can also be formed without departing from the spirit and scope of the present invention.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 is converted to current signal by voltage signal；
Front stage circuits input N positions input code to phase quantization DAC-circuit, and phase quantization DAC-circuit output voltage is used to control
Current converter, electric current caused by current converter control follow-up phase blender, and N is the natural number more than or equal to 2.
2. according to claim 1 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
Converter is made up of two structure identical current converters.
3. according to claim 1 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
The electric current reforming unit of converter includes operational amplifier, common-source stage transistor, regulation pipe, mirror image resistance.
4. according to claim 3 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
It is single-ended that common-source stage transistor, regulation pipe, mirror image resistance described in the electric current reforming unit of converter form a single ended input
The sign-changing amplifier of output, a closed loop circuit is formed together with the operational amplifier；Described closed loop circuit phase margin
More than or equal to 60 degree.
5. according to claim 3 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
Regulation pipe size described in converter is 2 times of subsequent phase blender differential pair tube size.
6. according to claim 3 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
The value of mirror image resistance described in converter is equal to the half of the value of load resistance in phase blender, and type is identical.
7. according to claim 3 be applied to current generating circuit in phase interpolator, it is characterised in that：Described electric current
Op-amp gain described in converter is at least above 60dB.
8. according to claim 1 be applied to current generating circuit in phase interpolator, it is characterised in that：Described phase
Quantifying DAC-circuit includes temperature code device, current switch and 2 output resistances.
9. according to claim 1 be applied to current generating circuit in phase interpolator, it is characterised in that：Described phase
Quantify DAC-circuit and use structure of current rudder, the resistance sizes phase of the resistance of phase quantization DAC-circuit and the current converter
Together, type is also 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106502298A CN106502298A (en) | 2017-03-15 |
| CN106502298B true CN106502298B (en) | 2017-11-14 |
Family
ID=58333291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611181651.0A Active CN106502298B (en) | 2016-12-20 | 2016-12-20 | One kind is applied to current generating circuit in low pressure phase interpolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106502298B (en) |
Citations (3)
| 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 |
| CN101310440A (en) * | 2005-12-27 | 2008-11-19 | 英特尔公司 | Phase interpolator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070063741A1 (en) * | 2005-09-22 | 2007-03-22 | Tarango Tony M | Testing of integrated circuit receivers |
| 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 (3)
| 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 |
| CN101310440A (en) * | 2005-12-27 | 2008-11-19 | 英特尔公司 | Phase interpolator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106502298A (en) | 2017-03-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Song et al. | A 0.47–0.66 pJ/bit, 4.8–8 Gb/s I/O transceiver in 65 nm CMOS | |
| CN101692603B (en) | Gain bootstrap type C class reverser and application circuit thereof | |
| US9634685B2 (en) | Telescopic amplifier with improved common mode settling | |
| US20220239305A1 (en) | Differential source follower with current steering devices | |
| CN106537276B (en) | A kind of linear regulator | |
| JP5906960B2 (en) | Semiconductor integrated circuit, signal transmission circuit, signal transmission system, and signal transmission method | |
| TW201724797A (en) | A clock and data recovery circuit and a phase interpolator therefor | |
| CN105071806B (en) | High linearity buffer input signal device applied to high-speed AD converter | |
| CN109314497B (en) | Low Supply Class AB Output Amplifier | |
| CN102025352A (en) | Hysteresis voltage comparator | |
| Song et al. | An 8–16 Gb/s, 0.65–1.05 pJ/b, voltage-mode transmitter with analog impedance modulation equalization and sub-3 ns power-state transitioning | |
| CN106953606A (en) | Fully differential amplifier and margin gain circuit using same | |
| CN104426525B (en) | Signal generation device | |
| JP6438422B2 (en) | Reference current generation circuit, AD converter, and wireless communication device | |
| CN102498672B (en) | Integrated circuit and electronic device comprising threshold generation circuitry and method therefor | |
| CN110460308B (en) | Wide-range annular voltage-controlled oscillator circuit | |
| CN103401551A (en) | Method and device for sampling high-speed serial signal in SerDes technology | |
| CN106502298B (en) | One kind is applied to current generating circuit in low pressure phase interpolator | |
| CN107066024A (en) | A kind of low power consumption high-precision non-bandgap reference voltage source | |
| US7663442B2 (en) | Data receiver including a transconductance amplifier | |
| KR20110098747A (en) | System and method for converting between cml signal logic families | |
| CN104917529B (en) | A kind of analog-digital commutator based on voltage controlled oscillator of restructural | |
| US7821305B1 (en) | Dual voltage buffer with current reuse | |
| TW201733271A (en) | Comparator and delta-sigma modulation circuit including a differential amplifier and an offset generator | |
| WO2018120555A1 (en) | Phase inerpolator circuit and method for improving linearity thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |