CN202143039U - Gilbert unit with folding structure - Google Patents
Gilbert unit with folding structure Download PDFInfo
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- CN202143039U CN202143039U CN201120275776U CN201120275776U CN202143039U CN 202143039 U CN202143039 U CN 202143039U CN 201120275776 U CN201120275776 U CN 201120275776U CN 201120275776 U CN201120275776 U CN 201120275776U CN 202143039 U CN202143039 U CN 202143039U
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Abstract
A Gilbert unit with a folding structure is composed of a first input end, a second input end, a load circuit, an input control circuit, a gain control circuit, tail current, a first output end and a second output end. The first input end and the second input end are used for inputting a pair of differential signals, and the first output end and the second output end are used for outputting a pair differential signals. The Gilbert unit with the folding structure also comprises a mirror image circuit connecting between the input control circuit and the gain control circuit. The mirror image circuit comprises a fifth field effect transistor connected with the input control circuit, a sixth field effect transistor connected with the input control circuit, a tenth field effect transistor connected with the sixth field effect transistor and the gain control circuit, and a eleventh field effect transistor connected with the fifth field effect transistor and the gain control circuit. The unit is simple in structure and wide in use application.
Description
Technical field
The utility model relates to a kind of Gilbert cell, refers to a kind of Gilbert cell with foldable structure especially.
Background technology
Gilbert cell is a kind of variable gain amplifier, its gain can by negative value vary continuously on the occasion of, being applicable to that gain requires the system of inverse change.
See also Fig. 1, Fig. 1 is existing Gilbert cell, and wherein VIN1+, VIN1-are input differential signal, and Vcont1+, Vcont1-are the gain-adjusted signal, and VB1 is a source current offset voltage, and VOUT1+, VOUT1-are output voltage.The scope that can draw common mode input VCM1 according to this structure is: VGS11+2*VDS1 < VCM1 < VDD1-I1*R/2+VTH1; Wherein VDD1 is a supply voltage, and I1 is the electric current that flows through FET M77, and VGS11 is the gate source voltage of FET M11 when flowing through I1/2; VDS1 is an overdrive voltage; VCM1 is the common-mode voltage of input differential signal VIN1+, VIN1-, and R=R1=R2, VTH1 are the threshold voltage of FET M11; The scope that can draw the minimum voltage value VOUT1 of output voltage simultaneously is: VOUT1>3VDS1.
This shows that existing Gilbert cell input common-mode scope is narrower, output voltage swing is less.When the amplitude of oscillation of upper level output needs the big input amplitude of oscillation than big or next stage, this structure can not satisfy.
Summary of the invention
In view of above content, be necessary to provide a kind of simple in structure and have the frequency divider reset circuit and a system of reset function.
A kind of Gilbert cell with foldable structure; Comprise first output and one second output that input control circuit that a first input end, one second input, a load circuit, link to each other with said first input end and said second input, the tail current, that a gain control circuit, links to each other with said gain control circuit link to each other with said load circuit and said input control circuit; Said first input end and said second input are used to import a pair of differential signal; Said first output and said second output are used to export a pair of differential signal; Said Gilbert cell with foldable structure comprises that also one is connected in the mirror image circuit between said input control circuit and the said gain control circuit, and said mirror image circuit comprises the 11 FET that the tenth FET and that the 6th FET, that the 5th FET, that links to each other with said input control circuit links to each other with said input control circuit links to each other with said the 6th FET and said gain control circuit links to each other with said the 5th FET and said gain control circuit.
Preferably; Said input control circuit comprises one first FET, one second FET, one the 3rd FET and one the 4th FET; Said first input end links to each other with the grid of said first FET and the grid of said second FET, and said second input links to each other with the grid of said the 3rd FET and the grid of said the 4th FET.
Preferably; Said load circuit comprises one first resistance and one second resistance; The source class of said first FET and the common drain electrode that is connected said the 5th FET of the source class of said the 4th FET; Said second output of the common connection of one end of the drain electrode of the drain electrode of said first FET, said the 3rd FET and said first resistance; The common drain electrode that is connected said the 6th FET of the source class of the source class of said second FET and said the 3rd FET, said first output of the common connection of the drain electrode of the drain electrode of said second FET, said the 4th FET and an end of said second resistance.
Preferably; Said gain control circuit comprises the 9th FET that the 8th FET and that one first control end, one second control end, link to each other with said first control end links to each other with said second control end; The grid of said the 5th FET is connected with grid, the drain electrode of the drain electrode of said the 9th FET, said the 11 FET jointly, and the grid of said the 6th FET is connected with grid, the drain electrode of the drain electrode of said the 8th FET, said the tenth FET jointly.
Preferably; Said tail current is one the 7th FET; The grid of said the 7th FET links to each other with a source current offset voltage end; Its drain electrode links to each other with the source class of said the 8th FET and the source class of said the 9th FET, and the grid of said the 8th FET links to each other with said first control end, and the grid of said the 9th FET links to each other with said second control end.
Preferably; The common power end that connects of the other end of the other end of the source class of said the 7th FET, said first resistance and said second resistance, the common earth terminal that connects of the source class of the source class of the source class of said the 5th FET, said the 6th FET, the source class of said the tenth FET and said the 11 FET.
Relative prior art; The Gilbert cell preferred embodiments that the utlity model has foldable structure folds the source electric current in the existing Gilbert cell; Make the scope of common mode input increase, the scope of output voltage has also increased, and the amplitude of oscillation that can satisfy the upper level output voltage is than situation big or the input amplitude of oscillation that the next stage needs are big; And the utility model is simple in structure, and the scope of application is extensive.
Description of drawings
Fig. 1 is the circuit diagram of existing Gilbert cell.
Fig. 2 is the structured flowchart that the utlity model has the Gilbert cell preferred embodiments of foldable structure.
Fig. 3 is the circuit diagram that the utlity model has the Gilbert cell preferred embodiments of foldable structure.
Embodiment
See also Fig. 2, the Gilbert cell preferred embodiments that the utlity model has foldable structure comprises first output and one second output that tail current, that gain control circuit, that mirror image circuit, that input control circuit, that a first input end, one second input, a load circuit, link to each other with this first input end and this second input links to each other with this input control circuit links to each other with this mirror image circuit links to each other with this gain control circuit links to each other with this load circuit and this input control circuit.
Please consult Fig. 3 simultaneously, this first input end and this second input are used to import a pair of differential signal VIN+, VIN-.This load circuit comprises one first resistance R D1 and one second resistance R D2.This input control circuit comprises one first FET M1, one second FET M2, one the 3rd FET M3 and one the 4th FET M4.This mirror image circuit comprises one the 5th FET M5, one the 6th FET M6,1 the tenth FET M10 and 1 the 11 FET M11.This gain control circuit comprises the 9th FET M9 that the 8th FET M8 and that one first control end Vcont+, one second control end Vcont-, link to each other with this first control end Vcont+ links to each other with this second control end Vcont-.This tail current is one the 7th FET M7.This first output and this second output are used to export a pair of differential signal VOUT+, VOUT-.
The physical circuit annexation of Gilbert cell preferred embodiments that the utlity model has foldable structure is following: this first input end links to each other with the grid of this first FET M1 and the grid of this second FET M2; And input differential signal VIN+; This second input links to each other with the grid of the 3rd FET M3 and the grid of the 4th FET M4, and input differential signal VIN-.The source class of this first FET M1 and the source class of the 4th FET M4 are connected the drain electrode of the 5th FET M5 jointly; The end of the drain electrode of this first FET M1, the drain electrode of the 3rd FET M3 and this first resistance R D1 connects this second output jointly, and output differential signal VOUT-.The source class of this second FET M2 and the source class of the 3rd FET M3 are connected the drain electrode of the 6th FET M6 jointly; The end of the drain electrode of this second FET M2, the drain electrode of the 4th FET M4 and this second resistance R D2 connects this first output jointly, and output differential signal VOUT+.The grid of the 5th FET M5 is connected with drain electrode, the grid of the 11 FET M11, the drain electrode of the 9th FET M9 jointly, and the grid of the 6th FET M6 is connected with drain electrode, the grid of the tenth FET M10, the drain electrode of the 8th FET M8 jointly.The grid of the 7th FET M7 links to each other with a source current offset voltage end VB; Its drain electrode links to each other with the source class of the 8th FET M8 and the source class of the 9th FET M9; The grid of the 8th FET M8 links to each other with this first control end Vcont+, and the grid of the 9th FET M9 links to each other with this second control end Vcont-.The common power end VDD that connects of the other end of the other end of the source class of the 7th FET M7, this first resistance R D1 and this second resistance R D2, the common earth terminal GND that connects of the source class of the source class of the source class of the 5th FET M5, the 6th FET M6, the source class of the tenth FET M10 and the 11 FET M11.
The principle Analysis of Gilbert cell preferred embodiments that the utlity model has foldable structure is following: this input control circuit, this mirror image circuit and this load circuit have been formed two operational amplifiers jointly; Wherein first operational amplifier is made up of this first FET M1, the 4th FET M4, the 5th FET M5, this first resistance R D1 and this second resistance R D2, and second operational amplifier is made up of this second FET M2, the 3rd FET M3, the 6th FET M6, this first resistance R D1 and this second resistance R D2.First operational amplifier has positive gain, and second operational amplifier has negative gain, and the 7th FET M7 provides the tail current that needs for these two operational amplifiers.This gain control circuit flows into the tail current of two operational amplifiers through the first control end Vcont+ and second control end Vcont-control; Thereby change the gain of two operational amplifiers; Because the gain of Gilbert cell is two operational amplifier gain sums; So the control through the first control end Vcont+ and the second control end Vcont-can make Gilbert cell change continuously to postiive gain from negative the gain, thereby has realized variable gain amplifier.Wherein, This first control end Vcont+ crosses the electric current of the tenth FET M10 through the 8th FET M8 control flows; This second control end Vcont-crosses the electric current of the 11 FET M11 through the 9th FET M9 control flows; Again because the 6th FET M6 is the mirror image of the tenth FET M10; The 5th FET M5 is the mirror image of the 11 FET M11, thereby has realized controlling through the first control end Vcont+ and the second control end Vcont-effect of the 5th FET M5 and the 6th FET M6.This moment, the scope of common mode input VCM was: VGS1+VDS < VCM < VDD-I*RD/2+VTH; Wherein VDD is a supply voltage, and I is the electric current that flows through FET M7, and VGS1 is the gate source voltage of FET M1 when flowing through I/2; VDS is an overdrive voltage; VCM is the common-mode voltage of input differential signal VIN+, VIN-, and RD=RD1=RD2, VTH are the threshold voltage of FET M1; The scope that can draw the minimum voltage value VOUT of output voltage simultaneously is: VOUT>2VDS.
This shows; The Gilbert cell preferred embodiments that the utlity model has foldable structure folds the source electric current in the existing Gilbert cell; Make the scope of common mode input VCM increase, the scope of output voltage has also increased, and the amplitude of oscillation that can satisfy the upper level output voltage is than situation big or the input amplitude of oscillation that the next stage needs are big; And the utility model is simple in structure, and the scope of application is extensive.
Claims (6)
1. Gilbert cell with foldable structure; Comprise first output and one second output that input control circuit that a first input end, one second input, a load circuit, link to each other with said first input end and said second input, the tail current, that a gain control circuit, links to each other with said gain control circuit link to each other with said load circuit and said input control circuit; Said first input end and said second input are used to import a pair of differential signal; Said first output and said second output are used to export a pair of differential signal; It is characterized in that: said Gilbert cell with foldable structure comprises that also one is connected in the mirror image circuit between said input control circuit and the said gain control circuit, and said mirror image circuit comprises the 11 FET that the tenth FET and that the 6th FET, that the 5th FET, that links to each other with said input control circuit links to each other with said input control circuit links to each other with said the 6th FET and said gain control circuit links to each other with said the 5th FET and said gain control circuit.
2. the Gilbert cell with foldable structure as claimed in claim 1; It is characterized in that: said input control circuit comprises one first FET, one second FET, one the 3rd FET and one the 4th FET; Said first input end links to each other with the grid of said first FET and the grid of said second FET, and said second input links to each other with the grid of said the 3rd FET and the grid of said the 4th FET.
3. the Gilbert cell with foldable structure as claimed in claim 2; It is characterized in that: said load circuit comprises one first resistance and one second resistance; The source class of said first FET and the common drain electrode that is connected said the 5th FET of the source class of said the 4th FET; Said second output of the common connection of one end of the drain electrode of the drain electrode of said first FET, said the 3rd FET and said first resistance; The common drain electrode that is connected said the 6th FET of the source class of the source class of said second FET and said the 3rd FET, said first output of the common connection of the drain electrode of the drain electrode of said second FET, said the 4th FET and an end of said second resistance.
4. the Gilbert cell with foldable structure as claimed in claim 3; It is characterized in that: said gain control circuit comprises the 9th FET that the 8th FET and that one first control end, one second control end, link to each other with said first control end links to each other with said second control end; The grid of said the 5th FET is connected with grid, the drain electrode of the drain electrode of said the 9th FET, said the 11 FET jointly, and the grid of said the 6th FET is connected with grid, the drain electrode of the drain electrode of said the 8th FET, said the tenth FET jointly.
5. the Gilbert cell with foldable structure as claimed in claim 4; It is characterized in that: said tail current is one the 7th FET; The grid of said the 7th FET links to each other with a source current offset voltage end; Its drain electrode links to each other with the source class of said the 8th FET and the source class of said the 9th FET, and the grid of said the 8th FET links to each other with said first control end, and the grid of said the 9th FET links to each other with said second control end.
6. the Gilbert cell with foldable structure as claimed in claim 5; It is characterized in that: the common power end that connects of the other end of the source class of said the 7th FET, said first resistance and the other end of said second resistance, the common earth terminal that connects of the source class of the source class of the source class of said the 5th FET, said the 6th FET, the source class of said the tenth FET and said the 11 FET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120275776U CN202143039U (en) | 2011-08-01 | 2011-08-01 | Gilbert unit with folding structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120275776U CN202143039U (en) | 2011-08-01 | 2011-08-01 | Gilbert unit with folding structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202143039U true CN202143039U (en) | 2012-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120275776U Withdrawn - After Issue CN202143039U (en) | 2011-08-01 | 2011-08-01 | Gilbert unit with folding structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202143039U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355216A (en) * | 2011-08-01 | 2012-02-15 | 四川和芯微电子股份有限公司 | Gilbert cell with folding structure |
-
2011
- 2011-08-01 CN CN201120275776U patent/CN202143039U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355216A (en) * | 2011-08-01 | 2012-02-15 | 四川和芯微电子股份有限公司 | Gilbert cell with folding structure |
| CN102355216B (en) * | 2011-08-01 | 2014-01-15 | 四川和芯微电子股份有限公司 | Gilbert cell with folding structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120208 Effective date of abandoning: 20140115 |
|
| RGAV | Abandon patent right to avoid regrant |