CN102035547A - Voltage-to-current converter - Google Patents
Voltage-to-current converter Download PDFInfo
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- CN102035547A CN102035547A CN2010105752656A CN201010575265A CN102035547A CN 102035547 A CN102035547 A CN 102035547A CN 2010105752656 A CN2010105752656 A CN 2010105752656A CN 201010575265 A CN201010575265 A CN 201010575265A CN 102035547 A CN102035547 A CN 102035547A
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Abstract
The invention discloses a voltage-to-current converter. The voltage-to-current converter comprises a first super source follower, a second super source follower and a current mirror image circuit. In the converter, output resistance is reduced by combining the two super source followers with the current mirror image circuit, and current is fed back to the super source followers to stabilize the super source followers through the current mirror image circuit to realize low impedance of an output end of the voltage-to-current converter; thus extremely high power supply rejection ratio can be obtained and good suppression effect on power noise can be achieved. The two super source followers are adopted to reduce the output voltage of the voltage-to-current converter and keep the output voltage close to input control voltage, so output of the converter can act on a current controlled oscillator of a metallic oxide semiconductor field effect transistor (MOSFET) device using low working voltage to improve the frequency of a voltage controlled oscillator.
Description
Technical field
The present invention is about a kind of voltage-current converter, particularly about a kind of voltage-current converter that is used for voltage controlled oscillator.
Background technology
As everyone knows, in the prior art, voltage-current converter is used for input voltage is converted to proportional with it output current.For example, all can use voltage-current converter usually in the voltage controlled oscillator in phase-locked loop circuit (generally being abbreviated as VCO).
Conventional voltage-current converter circuit adopts a nmos pass transistor and a current mirror 10 to realize the conversion of voltage to electric current usually, as shown in Figure 1, according to its operation principle, the output current I2=I1 of voltage-current converter, wherein I1 is the leakage current of nmos pass transistor M8, I1=VG, V then is the input voltage Vctrl of voltage-current converter, G is the mutual conductance of N type MOS transistor M8, thereby realized the conversion of voltage-to-current, but there is the very poor shortcoming of Power Supply Rejection Ratio in this current/charge-voltage convertor.
For solving conventional voltage-very poor shortcoming of current converter circuit Power Supply Rejection Ratio, prior art often adopts super source follower effectively to reduce output resistance to obtain Power Supply Rejection Ratio preferably in conjunction with current mirror circuit.Fig. 2 is a kind of circuit structure diagram that adopts the voltage-current converter of super source follower in the prior art.As shown in Figure 2, wherein voltage-current converter mainly utilizes super source follower 101 to reduce output resistance in conjunction with current mirror circuit 102, and by current mirror circuit 102 with current feedback to super source follower 101 to stablize the electric current of super source follower 101, further reduce the electric current shake of super source follower 101, better improve, can obtain Power Supply Rejection Ratio preferably outside Noise Suppression effect.
Along with the requirement of the renewal of technology and phase-locked loop frequency is more and more higher, the metal-oxide-semiconductor of the current control oscillator (ICO) that is connected with the current/charge-voltage convertor output uses the device (operating voltage is generally 1V or 1.2V) of low-work voltage high workload electric current gradually.Yet, the super source follower of voltage-current converter in the prior art is because will improve a Vgs to input control voltage Vctrl, will make the output voltage of voltage-current converter substantially exceed 1V like this, thereby make current control oscillator (ICO) can't use the metal-oxide-semiconductor of low-work voltage, and then the frequency raising of phase-locked loop (PLL) is restricted, can't embody the advantage of advanced technologies.
In sum, thereby the voltage current adapter of prior art exists output voltage to make the Current Control oscillating circuit can't use the problem of the metal-oxide-semiconductor of low-work voltage greatly as can be known, and therefore, reality is necessary to propose improved technological means, solves this problem.
Summary of the invention
For overcoming the big problem of voltage-current converter output voltage that above-mentioned prior art exists, main purpose of the present invention is to provide a kind of voltage-current converter, it is by adopting two super source followers, make the output voltage and the input control voltage of voltage-current converter very approaching, thereby it can be linked to each other with the current control oscillator that adopts the low-work voltage device, thereby improve the frequency of voltage controlled oscillator (VCO) in the phase-locked loop.
For reaching above-mentioned and other purpose, a kind of voltage-current converter of the present invention comprises:
The first super source follower, it comprises a PMOS transistor AND gate second nmos pass transistor that a current source, one the 3rd nmos pass transistor and drain electrode are joined at least, the one PMOS transistor source is connected in this current source and the 3rd nmos transistor drain simultaneously, grid is connected to an input control voltage, this second nmos pass transistor grid links to each other with a current mirror circuit, the source electrode of source electrode and the 3rd nmos pass transistor is ground connection simultaneously, and the 3rd nmos pass transistor grid is connected to a PMOS transistor drain;
One current mirror circuit is connected in this first super source follower and this input control voltage, be used for this input control voltage is converted to electric current, and with this current feedback to this first super source follower to stablize this first super source follower; And
The second super source follower, reduce the output voltage of this voltage-current converter when being used to keep outputting current steadily, make it approach this input control voltage, it comprises the 8th PMOS transistor AND gate the 9th nmos pass transistor that this current source, 1 the tenth nmos pass transistor and drain electrode are joined at least, the 8th PMOS transistor source is connected in this current source and the tenth nmos transistor drain simultaneously, and grid is connected to this current mirror circuit; The 9th MOS transistor grid links to each other with this second MOS transistor grid, and the source electrode of source electrode and the tenth MOS transistor is ground connection simultaneously, and the tenth MOS transistor grid is connected to the drain electrode of the 8th MOS transistor.
Further, this current mirror circuit comprises the 4th nmos pass transistor, the 7th nmos pass transistor, the 5th PMOS transistor and the 6th PMOS transistor, the 4th nmos pass transistor grid links to each other with this second nmos pass transistor grid, drain electrode and grid short circuit, source electrode and the 7th nmos pass transistor source electrode be ground connection simultaneously, the 7th nmos pass transistor grid is connected to this input control voltage, drain electrode is connected in the 6th PMOS transistor drain, link to each other its source electrode and the 6th PMOS transistor source with the 7th nmos transistor drain behind the 5th PMOS transistor AND gate the 6th PMOS transistor gate short circuit, the one PMOS transistor source and the transistorized grid of the 8th PMOS join jointly.
Further, this first super source follower also comprises a miller circuit, this miller circuit comprises the electric capacity and a resistance of mutual series connection, and this electric capacity other end is connected to a PMOS transistor source, and this resistance other end is connected to a PMOS transistor drain.
Further, this second super source follower also comprises a miller circuit, this miller circuit comprises the electric capacity and a resistance of mutual series connection, and this electric capacity other end is connected to the 8th PMOS transistor source, and this resistance other end is connected to the 8th PMOS transistor drain.
Further, this input control voltage is 0.7V-1.2V.
Compared with prior art, a kind of voltage-current converter of the present invention is by adopting two super source follow circuits, and utilize super source follower to reduce output resistance in conjunction with current mirror circuit, by current mirror circuit with current feedback to super source follower to stablize the electric current of super source follower, in the electric current shake that has further reduced super source follower, make the output voltage and the input control voltage of voltage-current converter very approaching, thereby make its can output action on the current control oscillator that adopts the low-work voltage device, further improve the frequency of voltage controlled oscillator.
Description of drawings
Fig. 1 is the electrical block diagram of conventional voltage-current converter;
Fig. 2 is the electrical block diagram of the voltage-current converter of the super source follower of available technology adopting;
Fig. 3 adopts the circuit structure diagram of the voltage-current converter of two super source followers for the present invention.
Embodiment
Below by specific instantiation and accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by the content that this specification disclosed.The present invention also can be implemented or be used by other different instantiation, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications and change under the spirit of the present invention not deviating from.
Fig. 3 is the circuit structure diagram of the preferred embodiment of a kind of voltage-current converter of the present invention.As shown in Figure 3, in preferred embodiment of the present invention, voltage-current converter of the present invention is used for voltage controlled oscillator (VCO), and it comprises at least: first super source follower 201, second super source follower 202 and the current mirror circuit 203.
Wherein, the first super source follower 201 comprise a current source A1, a P type MOS transistor (the first MOS transistor M1), two N type MOS transistor (the second MOS transistor M2 and the 3rd MOS transistor M3).Power supply Vcc links to each other with the source electrode of the first MOS transistor M1 by current source A1, the drain electrode of the first MOS transistor M1 links to each other with the drain electrode of the second MOS transistor M2, its grid is connected to an input control voltage Vctrl, in the present invention, input control voltage Vctrl is preferably 0.7V-1.2V, thereby makes the voltage current adapter output voltage approach 1V; The second MOS transistor M2 source ground, grid links to each other with current mirror circuit 202; The source ground of the 3rd MOS transistor M3, its drain electrode links to each other with the source electrode of the first MOS transistor M1, and grid is connected to the drain electrode of the first MOS transistor M1.
Similar to the first super source follower 201, the second super source follower 202 also comprises current source A1, a P type MOS transistor (the 8th MOS transistor M8), two N type MOS transistor (the 9th MOS transistor M9 and the tenth MOS transistor M10) at least, power supply Vcc links to each other with the source electrode of the 8th MOS transistor M8 by current source A1, the drain electrode of the 8th MOS transistor M8 links to each other with the drain electrode of the 9th MOS transistor M9, different with the first super source follower 201 is that its grid is connected to current mirror circuit 203; The 9th MOS transistor M9 source ground, grid links to each other with current mirror circuit 203, and links to each other with the grid of the second MOS transistor M2 of the first super source follower 201; The source ground of the tenth MOS transistor M10, its drain electrode links to each other with the source electrode of the 8th MOS transistor M8, grid is connected to the drain electrode of the 8th MOS transistor M8, the second super source follower 203 is used for reducing the output voltage of voltage-current converter when keeping outputting current steadily, make it approach input control voltage Vctrl, thereby the output of voltage-current converter can directly directly be linked to each other with the ICO that adopts low-work voltage MOS transistor (operating voltage is generally 1V or 1.2V at present).
For making output signal of the present invention more stable, the present invention also can be provided with Miller (Miller) circuit in the first super source follower 201 and the second super source follower 202, with to the first super source follower 201 and second 203 Millers of super source follower (Miller) compensating action.Miller circuit is made up of with resistance R 1 capacitor C 1 of mutual polyphone, in the first super source follower 201, capacitor C 1 one ends link to each other with the source electrode of the first MOS transistor M1, and the other end links to each other with resistance R 1, and the other end of resistance R 1 is connected with the drain electrode of the first MOS transistor M1; In the second super source follower 203, capacitor C 1 one ends link to each other with the source electrode of the 8th MOS transistor M8, and the other end links to each other with resistance R 1, and the other end of resistance R 1 is connected with the drain electrode of the 8th MOS transistor M8.
As seen, voltage-current converter of the present invention is by adopting two super source followers, and utilize super source follower to reduce output resistance in conjunction with current mirror circuit, by current mirror circuit with current feedback to super source follower to stablize the electric current of super source follower, in the electric current shake that has further reduced super source follower, make the output voltage and the input control voltage of voltage-current converter very approaching, thereby make its can output action on the current control oscillator that adopts the low-work voltage device, further improved the frequency of voltage controlled oscillator.
The foregoing description is illustrative principle of the present invention and effect thereof only, but not is used to limit the present invention.Any those skilled in the art all can be under spirit of the present invention and category, and the foregoing description is modified and changed.Therefore, the scope of the present invention should be listed as claims.
Claims (5)
1. voltage-current converter comprises at least:
The first super source follower, it comprises a PMOS transistor AND gate second nmos pass transistor that a current source, one the 3rd nmos pass transistor and drain electrode are joined at least, the one PMOS transistor source is connected in this current source and the 3rd nmos transistor drain simultaneously, grid is connected to an input control voltage, this second nmos pass transistor grid links to each other with a current mirror circuit, the source electrode of source electrode and the 3rd nmos pass transistor is ground connection simultaneously, and the 3rd nmos pass transistor grid is connected to a PMOS transistor drain;
One current mirror circuit is connected in this first super source follower and this input control voltage, be used for this input control voltage is converted to electric current, and with this current feedback to this first super source follower to stablize this first super source follower; And
The second super source follower, reduce the output voltage of this voltage-current converter when being used to keep outputting current steadily, make it approach this input control voltage, it comprises the 8th PMOS transistor AND gate the 9th nmos pass transistor that this current source, 1 the tenth nmos pass transistor and drain electrode are joined at least, the 8th PMOS transistor source is connected in this current source and the tenth nmos transistor drain simultaneously, and grid is connected to this current mirror circuit; The 9th MOS transistor grid links to each other with this second MOS transistor grid, and the source electrode of source electrode and the tenth MOS transistor is ground connection simultaneously, and the tenth MOS transistor grid is connected to the drain electrode of the 8th MOS transistor.
2. voltage-current converter as claimed in claim 1, it is characterized in that: this current mirror circuit comprises the 4th nmos pass transistor, the 7th nmos pass transistor, the 5th PMOS transistor and the 6th PMOS transistor, the 4th nmos pass transistor grid links to each other with this second nmos pass transistor grid, drain electrode and grid short circuit, source electrode and the 7th nmos pass transistor source electrode be ground connection simultaneously, the 7th nmos pass transistor grid is connected to this input control voltage, drain electrode is connected in the 6th PMOS transistor drain, link to each other its source electrode and the 6th PMOS transistor source with the 7th nmos transistor drain behind the 5th PMOS transistor AND gate the 6th PMOS transistor gate short circuit, the one PMOS transistor source and the transistorized grid of the 8th PMOS join jointly.
3. voltage-current converter as claimed in claim 2, it is characterized in that: this first super source follower also comprises a miller circuit, this miller circuit comprises the electric capacity and a resistance of mutual series connection, this electric capacity other end is connected to a PMOS transistor source, and this resistance other end is connected to a PMOS transistor drain.
4. voltage-current converter as claimed in claim 2, it is characterized in that: this second super source follower also comprises a miller circuit, this miller circuit comprises the electric capacity and a resistance of mutual series connection, this electric capacity other end is connected to the 8th PMOS transistor source, and this resistance other end is connected to the 8th PMOS transistor drain.
5. as claim 3 or 4 described voltage-current converters, it is characterized in that: this input control voltage is 0.7V-1.2V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010105752656A CN102035547A (en) | 2010-12-06 | 2010-12-06 | Voltage-to-current converter |
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| CN2010105752656A CN102035547A (en) | 2010-12-06 | 2010-12-06 | Voltage-to-current converter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102520757A (en) * | 2011-12-28 | 2012-06-27 | 南京邮电大学 | Sink current and source current generating circuit |
| CN103036558A (en) * | 2011-09-30 | 2013-04-10 | 中芯国际集成电路制造(上海)有限公司 | Voltage-controlled oscillator |
| CN103490767A (en) * | 2013-08-29 | 2014-01-01 | 苏州苏尔达信息科技有限公司 | High-speed high-precision buffer circuit |
| CN105071802A (en) * | 2015-08-14 | 2015-11-18 | 成都振芯科技股份有限公司 | VCO circuit with high phase noise performance |
| CN103475367B (en) * | 2013-09-26 | 2015-12-23 | 昆山锐芯微电子有限公司 | Voltage controlled oscillator |
| CN107979371A (en) * | 2017-12-28 | 2018-05-01 | 上海先基半导体科技有限公司 | A kind of phaselocked loop and its voltage controlled oscillator |
| CN107979356A (en) * | 2017-12-21 | 2018-05-01 | 上海华力微电子有限公司 | A kind of voltage-controlled oscillator circuit |
| CN110572151A (en) * | 2019-09-12 | 2019-12-13 | 辰芯科技有限公司 | Phase-locked loop circuit |
| CN111404540A (en) * | 2020-04-02 | 2020-07-10 | 深圳能芯半导体有限公司 | Class AB super-source follower circuit and differential class AB super-source follower circuit |
| WO2020188649A1 (en) * | 2019-03-15 | 2020-09-24 | 三菱電機株式会社 | Amplifier circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001094399A (en) * | 1999-09-20 | 2001-04-06 | Nec Corp | Voltage controlled oscillator |
| US20020057135A1 (en) * | 2000-05-01 | 2002-05-16 | Lizhong Sun | Low voltage differential voltage-controlled ring oscillator |
| US20100182086A1 (en) * | 2009-01-21 | 2010-07-22 | Carmine Cozzolino | Super source follower output impedance enhancement |
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2010
- 2010-12-06 CN CN2010105752656A patent/CN102035547A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001094399A (en) * | 1999-09-20 | 2001-04-06 | Nec Corp | Voltage controlled oscillator |
| US20020057135A1 (en) * | 2000-05-01 | 2002-05-16 | Lizhong Sun | Low voltage differential voltage-controlled ring oscillator |
| US20100182086A1 (en) * | 2009-01-21 | 2010-07-22 | Carmine Cozzolino | Super source follower output impedance enhancement |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036558A (en) * | 2011-09-30 | 2013-04-10 | 中芯国际集成电路制造(上海)有限公司 | Voltage-controlled oscillator |
| CN103036558B (en) * | 2011-09-30 | 2015-10-14 | 中芯国际集成电路制造(上海)有限公司 | Voltage controlled oscillator |
| CN102520757A (en) * | 2011-12-28 | 2012-06-27 | 南京邮电大学 | Sink current and source current generating circuit |
| CN102520757B (en) * | 2011-12-28 | 2013-11-27 | 南京邮电大学 | Sink current and source current generating circuit |
| CN103490767A (en) * | 2013-08-29 | 2014-01-01 | 苏州苏尔达信息科技有限公司 | High-speed high-precision buffer circuit |
| CN103475367B (en) * | 2013-09-26 | 2015-12-23 | 昆山锐芯微电子有限公司 | Voltage controlled oscillator |
| CN105071802A (en) * | 2015-08-14 | 2015-11-18 | 成都振芯科技股份有限公司 | VCO circuit with high phase noise performance |
| CN107979356A (en) * | 2017-12-21 | 2018-05-01 | 上海华力微电子有限公司 | A kind of voltage-controlled oscillator circuit |
| CN107979371A (en) * | 2017-12-28 | 2018-05-01 | 上海先基半导体科技有限公司 | A kind of phaselocked loop and its voltage controlled oscillator |
| CN107979371B (en) * | 2017-12-28 | 2024-03-22 | 上海先基半导体科技有限公司 | Phase-locked loop and voltage-controlled oscillator thereof |
| WO2020188649A1 (en) * | 2019-03-15 | 2020-09-24 | 三菱電機株式会社 | Amplifier circuit |
| CN110572151A (en) * | 2019-09-12 | 2019-12-13 | 辰芯科技有限公司 | Phase-locked loop circuit |
| CN111404540A (en) * | 2020-04-02 | 2020-07-10 | 深圳能芯半导体有限公司 | Class AB super-source follower circuit and differential class AB super-source follower circuit |
| CN111404540B (en) * | 2020-04-02 | 2023-06-23 | 深圳能芯半导体有限公司 | Class AB super source follower circuit and differential class AB super source follower circuit |
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Application publication date: 20110427 |