CN107340794A - A kind of current mode difference squaring circuit - Google Patents
A kind of current mode difference squaring circuit Download PDFInfo
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- CN107340794A CN107340794A CN201710366881.2A CN201710366881A CN107340794A CN 107340794 A CN107340794 A CN 107340794A CN 201710366881 A CN201710366881 A CN 201710366881A CN 107340794 A CN107340794 A CN 107340794A
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- transistor
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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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of current mode difference squaring circuit, including difference channel, the first resistive elements and the second resistive elements, the first DC current source current, the second DC current source and the first direct voltage source being made up of the transistor of same type.Circuit input is differential current signal, exports as one-terminal current signal, is powered using single supply.Increase the common mode electrical level of special construction adjustment input signal, improve the application of this circuit in systems.System output impedance is improved using feedback circuit structure, and then improves the operational precision of circuit.Input current signal is converted into voltage signal by circuit using linear resistive elements, by the square operation that current signal is realized in MOSFET superposition this voltage signal.Using the design feature of difference channel, error caused by MOSFET back-gate effects is eliminated.The present invention improves the operational precision of squaring circuit, expands the common-mode input range of circuit.
Description
Technical field
The present invention relates to a kind of analog multiplication circuit or the squaring circuit of frequency multiplier circuit, more particularly to a kind of current mode
Difference squaring circuit.
Background technology
Squaring circuit is a kind of typical nonlinear circuit, in circuit mainly complete signal frequency transformation, for a long time with
Come the squaring circuit based on multiplier not only because the particularity of its structure causes circuit voltage too low, and it is transported
Calculate precision as circuit output mutual conductance with the change of input signal and changing causes signal non-linear distortion occur.
How to improve the operational precision of squaring circuit and be that those skilled in the art are urgently to be resolved hurrily with the compatibility of system
Problem.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention seeks to：A kind of current mode difference squaring circuit is provided, is improved
The operational precision of squaring circuit, expand the common-mode input range of circuit.
The technical scheme is that：
A kind of current mode difference squaring circuit, including the difference channel being made up of the transistor of multiple same types, first crystal
The grid of pipe is connected with the grid of second transistor respectively, and the drain electrode of the first transistor is connected with the source electrode of the 5th transistor, the
The drain electrode of two-transistor is connected with grid, and the source electrode to drain also with the 6th transistor of the second transistor is connected, and the 3rd is brilliant
The grid of body pipe is connected with the grid of the 4th transistor, and the drain electrode of third transistor is connected with grid, the third transistor
The source electrode also with the 7th transistor that drains is connected, and the drain electrode of the 4th transistor is connected with the source electrode of the 8th transistor, the 5th crystal
The drain electrode of pipe is connected with grid, and the drain electrode of the 5th transistor is also connected with the first DC current source, the 5th transistor
Grid is connected with the grid of the 6th transistor, and the drain electrode of the 6th transistor is connected with the drain electrode of the 7th transistor, the 7th transistor
Grid be connected with the grid of the 8th transistor, the grid of the 8th transistor is connected with drain electrode, the drain electrode of the 8th transistor
Be also connected with the second DC current source, the source electrode of the first transistor by the source electrode of the first resistive elements and second transistor and
The source electrode of third transistor is connected, and is connected by the second resistive elements with the source electrode of the 4th transistor, the second transistor
Source electrode connection DC voltage provides end, and the DC voltage provides end and is used to provide certain DC voltage, and is to alternating current equivalent
Short circuit, first input end connect the source electrode of the first transistor, and the second input connects the source electrode of the 4th transistor, output end connection
The drain electrode and the drain electrode of the 7th transistor of 6th transistor..
Preferably, it is direct voltage source that the DC voltage, which provides end,.
Preferably, the DC voltage, which provides end, includes the 9th transistor for being operated in saturation region, second crystal
The source electrode of pipe connects the drain electrode of the 9th transistor, and the grid of the 9th transistor is connected with drain electrode, the 9th transistor
Source ground.
Compared with prior art, it is an advantage of the invention that：
The common mode electrical level of the squaring circuit increase special construction adjustment input signal of the present invention, improves this circuit in systems
Application.System output impedance is improved using feedback circuit structure, and then improves the operational precision of circuit.Using linear
Input current signal is converted into voltage signal by resistive elements, realizes that electric current is believed by this voltage signal in MOSFET superposition
Number square operation.Using the design feature of difference channel, error caused by MOSFET back-gate effects is eliminated.As can be seen here, originally
Invention improves the operational precision of squaring circuit, expands the common-mode input range of circuit.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment the invention will be further described：
Fig. 1 is the circuit diagram of an embodiment of differential current mode squaring circuit of the present invention；
Fig. 2 is the circuit diagram of another embodiment of differential current mode squaring circuit of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention of greater clarity, with reference to embodiment and join
According to accompanying drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright scope.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring this
The concept of invention.
Embodiment 1：
Referring to Fig. 1, a kind of schematic diagram of the embodiment for the difference current squaring circuit that Fig. 1 is provided by the embodiment of the present invention should
Circuit includes difference channel, the first resistive elements and the second resistive elements, the first direct current being made up of the transistor of same type
Current source, the second DC current source and the first direct voltage source.Transistor can be N-channel FET or P-channel field
Effect pipe.
It should be noted that M1 transistors correspond to the first transistor hereafter in Fig. 1, M2 transistors are corresponding hereafter in Fig. 1
Second transistor, the corresponding third transistor hereafter of M3 transistors in Fig. 1, corresponding hereafter the 4th brilliant of M4 transistors in Fig. 1
Body pipe, corresponding the 5th transistor hereafter of M5 transistors in Fig. 1, corresponding the 6th transistor hereafter of M6 transistors in Fig. 1, Fig. 1
Corresponding the 7th transistor hereafter of middle M7 transistors, corresponding the 8th transistor hereafter of M8 transistors in Fig. 1, Iin+ is saved in Fig. 1
The corresponding first input end hereafter of point, corresponding the second input hereafter of Iin- nodes in Fig. 1, the Iout nodes in 1 are corresponding
The first output end hereafter, the corresponding first resistors hereafter of R1 in Fig. 1, the corresponding second resistances hereafter of R2 in Fig. 1, Fig. 1
In corresponding the first DC current sources hereafter of ib1, corresponding the second DC current sources hereafter of ib2 in Fig. 1, the vb in Fig. 1
Corresponding the first direct voltage source hereafter.
Mutual clamper realizes two branch road electricity respectively for the first transistor, the transistor of second transistor the 5th and the 6th transistor
The accurate operational of stream, same third transistor, the 4th transistor, the transistor of the 7th transistor AND gate the 8th realize identical work(
Energy.
First direct voltage source anode the second end, the second end of second resistance, second transistor with first resistor respectively
Source electrode be connected with the source electrode of third transistor, first the second end is connected to the ground.First direct voltage source act as entirety
The operation level of circuit is lifted, the dc point for improving circuit is made up to close at supply voltage half, to exchange
Signal is equivalent to short circuit.
Embodiment 2：
The specific schematic diagram of another embodiment for the difference current squaring circuit that Fig. 2 is provided by the embodiment of the present invention, its with
Being distinguished as of Fig. 1 replaces the vb in Fig. 1 using M9, and the function of circuit is realized under the device that circuit gives.M9 crystal in Fig. 2
The grid of pipe is connected with drain electrode, and then the second end with R1, R2, M2, M3 source electrode are connected respectively, source electrode and the ground of M9 transistors
It is connected.M9 is a MOSFET for being operated in saturation region, and it can be equivalent to a diode.From the working characteristics of diode
Once it is turned on for AC signal equivalent to short circuit, while can provide metastable DC voltage again, therefore utilizes company
The MOSFET for being connected into diode is the operation level of overall lifting circuit, suitable with the effect of the first direct voltage source.
It should be appreciated that the above-mentioned embodiment of the present invention is used only for exemplary illustration or explains the present invention's
Principle, without being construed as limiting the invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent substitution, improvement etc., should be included in the scope of the protection.In addition, appended claims purport of the present invention
Covering the whole changes fallen into scope and border or this scope and the equivalents on border and repairing
Change example.
Claims (3)
1. a kind of current mode difference squaring circuit, it is characterised in that including the difference being made up of the transistor of multiple same types
Circuit, the grid of the first transistor are connected with the grid of second transistor respectively, the drain electrode of the first transistor and the 5th transistor
Source electrode be connected, the drain electrode of second transistor is connected with grid, source of the drain electrode also with the 6th transistor of the second transistor
Extremely it is connected, the grid of third transistor is connected with the grid of the 4th transistor, and the drain electrode of third transistor is connected with grid, described
Source electrode of the drain electrode of third transistor also with the 7th transistor is connected, the drain electrode of the 4th transistor and the source electrode phase of the 8th transistor
Even, the drain electrode of the 5th transistor is connected with grid, and the drain electrode of the 5th transistor is also connected with the first DC current source, and described the
The grid of five transistors is connected with the grid of the 6th transistor, and the drain electrode of the 6th transistor is connected with the drain electrode of the 7th transistor,
The grid of 7th transistor is connected with the grid of the 8th transistor, and the grid of the 8th transistor is connected with drain electrode, and the described 8th is brilliant
The drain electrode of body pipe is also connected with the second DC current source, and the source electrode of the first transistor passes through the first resistive elements and the second crystal
The source electrode of pipe is connected with the source electrode of third transistor, is connected by the second resistive elements with the source electrode of the 4th transistor, and described
The source electrode connection DC voltage of two-transistor provides end, and the DC voltage provides end and is used to provide certain DC voltage, and right
Alternating current equivalent is short circuit, and first input end connects the source electrode of the first transistor, and the second input connects the source electrode of the 4th transistor,
Output end connects the drain electrode and the drain electrode of the 7th transistor of the 6th transistor.
2. current mode difference squaring circuit according to claim 1, it is characterised in that it is straight that the DC voltage, which provides end,
Flow voltage source.
3. current mode difference squaring circuit according to claim 1, it is characterised in that the DC voltage, which provides end, to be included
One is operated in the 9th transistor of saturation region, and the source electrode of the second transistor connects the drain electrode of the 9th transistor, and the described 9th
The grid of transistor is connected with drain electrode, the source ground of the 9th transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710366881.2A CN107340794B (en) | 2017-05-23 | 2017-05-23 | A kind of current mode difference squaring circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710366881.2A CN107340794B (en) | 2017-05-23 | 2017-05-23 | A kind of current mode difference squaring circuit |
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| Publication Number | Publication Date |
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| CN107340794A true CN107340794A (en) | 2017-11-10 |
| CN107340794B CN107340794B (en) | 2018-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710366881.2A Active CN107340794B (en) | 2017-05-23 | 2017-05-23 | A kind of current mode difference squaring circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08106504A (en) * | 1994-08-12 | 1996-04-23 | Nec Corp | Square circuit |
| CN102904566A (en) * | 2011-07-28 | 2013-01-30 | 联发科技（新加坡）私人有限公司 | Squaring circuit, integrated circuit, wireless communication unit and method therefor |
| CN104184459A (en) * | 2014-07-30 | 2014-12-03 | 苏州纳芯微电子有限公司 | High-precision analog squaring circuit |
| CN104901674A (en) * | 2014-03-06 | 2015-09-09 | 昆山启达微电子有限公司 | Current mode four-quadrant CMOS analog multiplication circuit |
-
2017
- 2017-05-23 CN CN201710366881.2A patent/CN107340794B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08106504A (en) * | 1994-08-12 | 1996-04-23 | Nec Corp | Square circuit |
| CN102904566A (en) * | 2011-07-28 | 2013-01-30 | 联发科技（新加坡）私人有限公司 | Squaring circuit, integrated circuit, wireless communication unit and method therefor |
| CN104901674A (en) * | 2014-03-06 | 2015-09-09 | 昆山启达微电子有限公司 | Current mode four-quadrant CMOS analog multiplication circuit |
| CN104184459A (en) * | 2014-07-30 | 2014-12-03 | 苏州纳芯微电子有限公司 | High-precision analog squaring circuit |
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| Publication number | Publication date |
|---|---|
| CN107340794B (en) | 2018-08-21 |
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Effective date of registration: 20190423 Address after: 215123 Linquan Street 399, Dushu Lake Higher Education District, Suzhou Industrial Park, Jiangsu Province Patentee after: Suzhou Institute, Southeast University Address before: 210008 No. 2, Four Brand Building, Xinjiekou Street, Xuanwu District, Nanjing City, Jiangsu Province Patentee before: Southeast University |
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