CN101592967B - Reference voltage-regulating circuit for temperature compensation and relative conveyer device - Google Patents
Reference voltage-regulating circuit for temperature compensation and relative conveyer device Download PDFInfo
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- CN101592967B CN101592967B CN2008100984984A CN200810098498A CN101592967B CN 101592967 B CN101592967 B CN 101592967B CN 2008100984984 A CN2008100984984 A CN 2008100984984A CN 200810098498 A CN200810098498 A CN 200810098498A CN 101592967 B CN101592967 B CN 101592967B
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Abstract
The invention relates to a reference voltage-regulating circuit for temperature compensation and a relative conveyer device. The reference voltage-regulating circuit comprise a receiving end, an output end, a compensation current generating unit and a resistor, wherein the receiving end is used for receiving a common mode voltage; the output end is used for outputting a reference voltage; the compensation current generating unit is used for generating a temperature compensation current according to temperature variation; one end of the resistor is coupled to the receiving end, and the other end of the resistor is coupled to the output end and the compensation current generating unit so as to generate a compensation voltage according to the temperature compensation current. The reference voltage output by the output end is the sum of the common mode voltage and the compensation voltage, and the common mode reference voltage of an amplifier is controlled by generating the temperature compensation current varied with temperature so as to compensate the influence of temperature effect on the gain of the amplifier. In addition, the circuit construction can simultaneously save the number of operational amplifiers needed in the prior conveyer construction to further save the chip area and electricity consumption.
Description
Technical field
The present invention is meant a kind of reference voltage-regulating circuit and relevant conveyer that is used for carrying out temperature compensation, refers to a kind of by producing reference voltage-regulating circuit and the relevant conveyer of temperature-compensated current to adjust the post-amplifier reference voltage especially.
Background technology
In common wireless telecommunication system, radiofrequency signal sees through conveyer and transmits, to carry out wireless telecommunications.Please refer to Fig. 1, Fig. 1 is the functional block diagram of a known conveyer 10.Conveyer 10 includes a fundamental frequency processing unit 110, a digital to analog converter 120, a modulating unit 130 and a power amplifier 140.Fundamental frequency processing unit 110 is used for producing the fundamental frequency signal of digital form, and sees through the fundamental frequency signal that digital to analog converter 120 converts the fundamental frequency signal of digital form to analog form.Modulating unit 130 is used for a fundamental frequency signal and a high frequency carrier that digital to analog converter 120 is exported are modulated, and after the power amplification of power amplifier 140 with modulation signal, sees through the antenna transmission radiofrequency signal.
In actual conveyer circuit, because resistance and transistor unit regular meeting change its circuit characteristic because of temperature variation, so the amplifier gain of each circuit unit also can be subjected to temperature effect in the conveyer, causes the output power drift or produces wrong radiofrequency signal.
Therefore, known technology generally can produce fixing common mode reference voltage by deciding transduction circuit, is subjected to influence of temperature variation to avoid amplifier gain.For instance, please refer to Fig. 2, Fig. 2 is the configuration diagram of the modulating unit 230 in the known conveyer.Modulating unit 230 includes one first wave filter 231, one second wave filter 232, certain transduction circuit 233 and an amplifier 234.First wave filter 231 and second wave filter 232 are mainly used to the usefulness as wave shaping, so that the signal of prime digital to analog converter output meets required frequency spectrum form.Decide transduction circuit 233 and see through the input end (being the grid of transistor M1) that a resistance R 1 is coupled to amplifier 234, be used to provide the common mode reference voltage Vx of amplifier fixed size, exert an influence with the gain of avoiding the temperature effect pair amplifier.The detailed operation mode of deciding transduction circuit is known to those skilled in the art, does not give unnecessary details in this.234 in amplifier can be various forms of amplifier circuits (as the common-source stage amplifiers), is used for realizing mixer modulation circuits such as (Mixer), carries out modulation treatment with the fundamental frequency signal that wave filter is exported.
In modulating unit 230, resistance R 1 is mainly used to as the usefulness that stops the fundamental frequency signal of form of communication, decide transduction circuit and cause signal attenuation to avoid AC signal to flow into, so it generally needs with big resistance value realization, yet so will cause the raising of chip area and cost.
In order to save chip area and power consumption, known technology can replace active filters by passive wave filter in addition, to save the quantity of operational amplifier in the chip.Please refer to Fig. 3, Fig. 3 is the configuration diagram of the modulating unit 330 in the known conveyer.Compared to Fig. 2, modulating unit 330 is to realize a low-pass filter 332 by a resistance R 2 and a capacitor C 2, replacing the low-pass filter 232 among Fig. 2, and then reaches the purpose of same waveform as shaping.In the case, see through the law of partial pressure, the bias voltage Vx of amplifier 334 can represent by following formula:
Wherein Vcm represents the common mode voltage that first wave filter 331 is exported.Yet, since resistance R 1 still need with big resistance realize (be R1＞＞R2), this moment amplifier bias voltage Vx common mode voltage Vcm that convergence first wave filter 331 is exported, it is ineffective so will to cause deciding transduction circuit.
Summary of the invention
Purpose of the present invention promptly is to provide a kind of reference voltage-regulating circuit and relevant conveyer device thereof that is used for carrying out temperature compensation.
The present invention discloses a kind of reference voltage-regulating circuit that is used for carrying out temperature compensation, and it includes a receiving end and is used for receiving a common mode voltage; One output terminal is used for exporting a reference voltage; One compensation current generating unit is used for according to temperature variation, produces a temperature-compensated current; And a resistance, the one end is coupled to this receiving end, and the other end is coupled to this output terminal and this compensation current generating unit, is used for producing a bucking voltage according to this temperature-compensated current; Wherein this reference voltage of exporting of this output terminal is a summation of this common mode voltage and this bucking voltage.
The present invention discloses a kind of conveyer device of tool temperature compensation function in addition, and it includes a wave filter, an amplifier and a reference voltage-regulating circuit.This reference voltage-regulating circuit is coupled between this wave filter and this amplifier, and it includes a receiving end and is used for receiving the common mode voltage that this wave filter is exported; One output terminal is used for exporting a reference voltage, to drive this amplifier; One compensation current generating unit is coupled to this output terminal, is used for according to temperature variation, produces a temperature-compensated current; And a resistance, the one end is coupled to this receiving end, and the other end is coupled to this output terminal and this compensation current generating unit, is used for producing a bucking voltage according to this temperature-compensated current; Wherein, this reference voltage that this output terminal is exported is a summation of this common mode voltage and this bucking voltage, in order to carry out temperature compensation.
The present invention is by producing temperature variant temperature-compensated current, the common mode reference voltage of control amplifier, the influence that is produced with the gain of compensation temperature effect pair amplifier.In addition, circuit framework of the present invention can be saved the quantity of required use operational amplifier in the known conveyer framework simultaneously, and then saves chip area and power consumption.
Description of drawings
Fig. 1 is the functional block diagram of a known conveyer.
Fig. 2 and Fig. 3 are the configuration diagram of the modulating unit in the known conveyer.
Fig. 4 is used for the synoptic diagram of a modulating unit of a conveyer for the present invention.
Fig. 5 is the embodiment synoptic diagram of reference voltage-regulating circuit among Fig. 4.
Fig. 6 is used for the embodiment synoptic diagram of a modulating unit of a conveyer for the present invention.
Drawing reference numeral:
10 conveyers
110 fundamental frequency processing units
120 digital to analog converters
130 modulating units
140 power amplifiers
230,330,40,60 modulating units
231,232,331,332,41 wave filters
233,333 decide transduction circuit
234,334,42 amplifiers
R1, R2, R3 resistance
C1, C2, C3 electric capacity
The M1 transistor
The Vx common mode reference voltage
The Vcm common mode voltage
43 reference voltage-regulating circuits
435 compensation current generating unit
The Ic temperature-compensated current
The Vc bucking voltage
CS1, CS2 current source
The electric current that IPTAT is directly proportional with absolute temperature
IBG energy gap reference current
Embodiment
Please refer to Fig. 4, Fig. 4 is used for the synoptic diagram of a modulating unit 40 of a conveyer for the present invention.Modulating unit 40 includes a wave filter 41, an amplifier 42 and a reference voltage-regulating circuit 43.Wave filter 41 is used for the signal of prime digital to analog converter output is carried out filtering, to reach the effect of wave shaping.Amplifier 42 can be various forms of amplifier circuits (as the common-source stage amplifiers), is used for realizing mixer modulation circuits such as (Mixer), carries out modulation treatment such as smear or amplification with the fundamental frequency signal that wave filter 41 is exported.Reference voltage-regulating circuit 43 is coupled between wave filter 41 and the amplifier 42, is used for according to temperature variation, adjusts a common mode reference voltage Vx of amplifier 42, the influence that is produced with the gain of compensation temperature effect pair amplifier.
Wherein, reference voltage-regulating circuit 43 includes a compensation current generating unit 435 and a resistance R 3 in addition.Compensation current generating unit 435 is used for according to temperature variation, produces a temperature-compensated current Ic.One end of resistance R 3 is coupled to wave filter 41, the other end is coupled to the input end (being the grid of transistor M1) of compensation current generating unit 435 and amplifier 42, be used for the temperature-compensated current Ic that exported according to compensation current generating unit 435, produce a bucking voltage Vc.In this case, the common mode reference voltage Vx of amplifier 42 will equal a common mode voltage Vcm that wave filter 41 exported and the summation of bucking voltage Vc.
Therefore, the temperature-compensated current Ic that the present invention can be produced by compensation current generating unit 435 adjusts the common mode reference voltage Vx of amplifier, the influence that is produced with the gain of compensation temperature effect pair amplifier.In addition, in the present invention, resistance R 3 is not as the usefulness that stops AC signal, so it can be by resistance existing in the circuit or extra small resistor realization, to save the chip production cost.
For instance, please refer to Fig. 5, Fig. 5 is the embodiment synoptic diagram of reference voltage-regulating circuit 43 among Fig. 4.As shown in Figure 5, compensation current generating unit 435 can be made up of one first current source CS1 and one second current source CS2.The first current source CS1 is used to provide with absolute temperature be directly proportional (Proportionalto Absolute Temperature, one first electric current I PTAT PTAT); The second current source CS2 is used for drawing the one second electric current I BG that becomes to have nothing to do with absolute temperature, or claims with reference to energy gap electric current (Band GapCurrent); The difference of the first electric current I PTAT and the second electric current I BG then flows to resistance R 3 formation temperature offset current Ic.Wherein, the electric current that is directly proportional with absolute temperature and with reference to the producing method of energy gap electric current, known to those skilled in the art, do not give unnecessary details in this.In this case, the first electric current I PTAT also is directly proportional with absolute temperature with the formed temperature-compensated current Ic of the difference of the second electric current I BG, or claims temperature-compensated current Ic to have positive temperature coefficient (PTC).
In general, Amplifier Gain can and reduce along with the temperature rising, for example the transduction meeting of transistor M1 is risen along with temperature and is reduced, therefore the present invention can be by having the temperature-compensated current of positive temperature coefficient (PTC), the influence that the gain of compensation temperature effect pair amplifier is caused takes place with the situation of avoiding conveyer to produce wrong radiofrequency signal or output power drift.
In addition, when reality realizes compensation current generating unit 435, the present invention in addition can be by suitably disposing transistor size or the quantity of the first current source CS1 or the second current source CS2, adjusting the temperature coefficient of temperature-compensated current, and then reaches the compensation effect of amplifier gain.
Note that the foregoing description only is used as of the present invention one explanation for example, those skilled in the art work as and can suitably revise according to the actual requirements, and are not limited thereto.For example, first electric current that the first current source CS1 is produced can be one with the irrelevant reference energy gap electric current of absolute temperature, and second electric current that the second current source CS2 is produced can be an electric current that is directly proportional with absolute temperature.Thus, the difference of first electric current and second electric current will produce the temperature-compensated current of a tool negative temperature coefficient.Perhaps, first electric current and second electric current all can be realized by the electric current that is directly proportional with absolute temperature, to increase the elasticity of adjusting the offset current temperature coefficient.Corresponding variation like this all belongs to scope of the present invention.
In addition, reference voltage-regulating circuit of the present invention is not limited to the application of conveyer, carry out the temperature compensation circuit framework and can be applicable to the gain of any need pair amplifier, and it also belongs to scope of the present invention.On the other hand, please refer to Fig. 6, Fig. 6 is used for the embodiment synoptic diagram of a modulating unit 60 of a conveyer for the present invention.Compared to Fig. 4, modulating unit 60 includes a capacitor C 3 in addition, and the resistance R 3 that is used for arranging in pairs or groups realizes a passive wave filter, with the quantity of required use operational amplifier in the saving conveyer, and then saves chip area and power consumption.
In sum, the present invention is by producing temperature variant temperature-compensated current, the common mode reference voltage of control amplifier, the influence that is produced with the gain of compensation temperature effect pair amplifier.In addition, circuit framework of the present invention can be saved the quantity of required use operational amplifier in the known conveyer framework simultaneously, and then saves chip area and power consumption.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. a reference voltage-regulating circuit that carries out temperature compensation is characterized in that, described reference voltage-regulating circuit includes:
One receiving end is used for receiving a common mode voltage;
One output terminal is used for exporting a reference voltage;
One compensation current generating unit is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage exported of described output terminal is a summation of described common mode voltage and described bucking voltage;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide one first electric current that is directly proportional with absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing and one second irrelevant electric current of absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
2. reference voltage-regulating circuit as claimed in claim 1 is characterized in that, described resistance is the resistance of a tool small resistor value.
3. reference voltage-regulating circuit as claimed in claim 1 is characterized in that described reference voltage-regulating circuit comprises an electric capacity in addition, and the one end is coupled to described output terminal, and the other end is coupled to a ground end.
4. reference voltage-regulating circuit as claimed in claim 3 is characterized in that, described resistance and described electric capacity are used as a passive wave filter in addition.
5. reference voltage-regulating circuit as claimed in claim 1 is characterized in that described output terminal is coupled to the input end of a post-amplifier, and the described reference voltage that described output terminal is exported is a common mode bias voltage of described post-amplifier.
6. a reference voltage-regulating circuit that carries out temperature compensation is characterized in that, described reference voltage-regulating circuit includes:
One receiving end is used for receiving a common mode voltage;
One output terminal is used for exporting a reference voltage;
One compensation current generating unit is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage exported of described output terminal is a summation of described common mode voltage and described bucking voltage;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide and one first irrelevant electric current of absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing one second electric current that is directly proportional with absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
7. a reference voltage-regulating circuit that carries out temperature compensation is characterized in that, described reference voltage-regulating circuit includes:
One receiving end is used for receiving a common mode voltage;
One output terminal is used for exporting a reference voltage;
One compensation current generating unit is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage exported of described output terminal is a summation of described common mode voltage and described bucking voltage;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide one first electric current that is directly proportional with absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing one second electric current that is directly proportional with absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
8. the conveyer device of a tool temperature compensation function is characterized in that, described conveyer device includes:
One wave filter;
One amplifier; And
One reference voltage-regulating circuit is coupled between described wave filter and the described amplifier, and it includes:
One receiving end is used for receiving the common mode voltage that described wave filter is exported;
One output terminal is used for exporting a reference voltage, to drive described amplifier;
One compensation current generating unit is coupled to described output terminal, is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage that described output terminal is exported is a summation of described common mode voltage and described bucking voltage, in order to carry out temperature compensation;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide one first electric current that is directly proportional with absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing and one second irrelevant electric current of absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
9. conveyer device as claimed in claim 8 is characterized in that, described resistance is the resistance of a tool small resistor value.
10. conveyer device as claimed in claim 8 is characterized in that described reference voltage-regulating circuit includes an electric capacity in addition, and the one end is coupled to described output terminal, and the other end is coupled to a ground end.
11. conveyer device as claimed in claim 10 is characterized in that, described resistance and described electric capacity are used as a passive wave filter in addition.
12. the conveyer device of a tool temperature compensation function is characterized in that, described conveyer device includes:
One wave filter;
One amplifier; And
One reference voltage-regulating circuit is coupled between described wave filter and the described amplifier, and it includes:
One receiving end is used for receiving the common mode voltage that described wave filter is exported;
One output terminal is used for exporting a reference voltage, to drive described amplifier;
One compensation current generating unit is coupled to described output terminal, is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage that described output terminal is exported is a summation of described common mode voltage and described bucking voltage, in order to carry out temperature compensation;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide and one first irrelevant electric current of absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing one second electric current that is directly proportional with absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
13. the conveyer device of a tool temperature compensation function is characterized in that, described conveyer device includes:
One wave filter;
One amplifier; And
One reference voltage-regulating circuit is coupled between described wave filter and the described amplifier, and it includes:
One receiving end is used for receiving the common mode voltage that described wave filter is exported;
One output terminal is used for exporting a reference voltage, to drive described amplifier;
One compensation current generating unit is coupled to described output terminal, is used for according to temperature variation, produces a temperature-compensated current; And
One resistance, the one end is coupled to described receiving end, and the other end is coupled to described output terminal and described compensation current generating unit, is used for producing a bucking voltage according to described temperature-compensated current;
Wherein, the described reference voltage that described output terminal is exported is a summation of described common mode voltage and described bucking voltage, in order to carry out temperature compensation;
Described compensation current generating unit includes:
One first current source is coupled to described output terminal, is used to provide one first electric current that is directly proportional with absolute temperature; And
One second current source is coupled to described output terminal, is used for drawing one second electric current that is directly proportional with absolute temperature;
Wherein, described temperature-compensated current is a difference of described first electric current and described second electric current.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100984984A CN101592967B (en) | 2008-05-28 | 2008-05-28 | Reference voltage-regulating circuit for temperature compensation and relative conveyer device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100984984A CN101592967B (en) | 2008-05-28 | 2008-05-28 | Reference voltage-regulating circuit for temperature compensation and relative conveyer device |
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| CN101592967A CN101592967A (en) | 2009-12-02 |
| CN101592967B true CN101592967B (en) | 2011-12-07 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103051292B (en) * | 2012-12-10 | 2015-10-07 | 广州润芯信息技术有限公司 | Radio frequency sending set, its gain compensation circuit and method |
| CN105487452B (en) * | 2015-12-31 | 2019-02-12 | 杭州士兰微电子股份有限公司 | Signal processing circuit and method |
| CN105446234B (en) * | 2015-12-31 | 2019-02-12 | 杭州士兰微电子股份有限公司 | Signal processing circuit and method |
| CN107995135B (en) * | 2017-10-31 | 2021-07-23 | 北京集创北方科技股份有限公司 | Channel attenuation compensation system, method, circuit, storage medium and processor |
| CN110086437A (en) * | 2018-01-26 | 2019-08-02 | 华为技术有限公司 | Operational amplifier and chip |
| CN108832900A (en) * | 2018-05-31 | 2018-11-16 | 北京集创北方科技股份有限公司 | Operational amplification circuit and its over-current protection method |
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