CN112039444A - Gain amplifier for improving variation range of positive temperature coefficient - Google Patents
Gain amplifier for improving variation range of positive temperature coefficient Download PDFInfo
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Abstract
The invention discloses a gain amplifier for increasing the change range of a positive temperature coefficient, which solves the defects that the temperature coefficient of the traditional temperature compensation circuit is small, the negative temperature coefficient of the amplifier cannot be fully compensated to be zero, and the traditional temperature compensation circuit does not have the temperature coefficient adjusting capability in a wide range. The temperature coefficient adjustable circuit comprises a gain circuit, a tail current tube circuit, a variable temperature coefficient current circuit, a positive temperature coefficient current circuit and a negative temperature coefficient current circuit, wherein the function of expanding the change range of the positive temperature coefficient is realized by respectively connecting the input end and the output end of the positive temperature coefficient current circuit and the output end of the variable temperature coefficient current circuit to the tail current tube circuit, and the function of adjusting the temperature coefficient is realized by the variable temperature coefficient current circuit. The invention has the advantages of larger positive temperature coefficient range and capability of realizing different temperature coefficient adjusting functions from zero temperature coefficient to larger positive temperature coefficient.
Description
Technical Field
The invention relates to the field of semiconductor integrated circuits, in particular to a gain amplifier for improving the variation range of a positive temperature coefficient.
Background
As shown in fig. 1, a common ptc amplifier generally uses resistors R1 and R2 with a ptc as a load, and a ptc current flows through input pair transistors M1 and M2 to generate a ptc transconductance, but a resistor provided by a common process plant has a smaller temperature coefficient, and a larger ptc amplifier is needed, so that a temperature compensation range is insufficient.
In radio frequency amplification systems, the amplifier chain often has a negative temperature coefficient, i.e., its gain ranges from-45 ℃ to 125 ℃, and the gain decreases significantly with increasing temperature. Therefore, the intermediate frequency amplifier of the radio frequency link is required to be compensated by the positive temperature coefficient, so that the gain of the compensated radio frequency link is not changed along with the temperature change as much as possible. The traditional temperature compensation circuit has a small temperature compensation coefficient, which is not enough to completely compensate the negative temperature coefficient of the amplifier to zero temperature coefficient, and the general temperature compensation circuit has a small temperature coefficient and a wide temperature coefficient adjustable range.
Disclosure of Invention
The invention aims to solve the problem that the variation range of the positive temperature coefficient of the gain amplifier is improved, and the function of adjusting the positive temperature coefficient of the gain amplifier is realized in a wider range.
The invention is realized by the following technical scheme:
a gain amplifier for increasing the range of a positive temperature coefficient change, comprising an amplifier circuit and an amplifier bias circuit, wherein:
the amplifier circuit comprises a gain circuit and a tail current tube circuit, and the output of the tail current tube circuit is connected to the gain circuit;
the amplifier bias circuit comprises a variable temperature coefficient current circuit, a positive temperature coefficient current circuit and a negative temperature coefficient current circuit;
the input end and the output end of the positive temperature coefficient current circuit and the output end of the variable temperature coefficient current circuit are respectively connected to the tail current tube circuit.
The beneficial effect of the above scheme is that the variation range of the positive temperature coefficient is enlarged by the improvement of the gain circuit and the arrangement of the tail current tube circuit. Different currents are selected by the variable temperature coefficient current circuit to be combined and output to the tail current tube circuit, currents with different temperature coefficients are generated, and the adjustment of the gain temperature coefficient is realized
Further, in the above-mentioned case,
the gain circuit comprises amplifier differential input pair transistors M1 and M2, amplifier load pair transistors M3 and M4 and an amplifier adjusting transistor M0, wherein the source of M3 is connected with the drain of M1, and the source of M4 is connected with the drain of M2; the drain of M0 is connected with the sources of M1 and M2, the source of M0 is grounded, the drains and gates of M3 and M4 are connected with a system power supply, and the gates of M1 and M2 are respectively connected with a second bias voltage.
The positive temperature coefficient amplifier has the advantages that the MOS tube through which the negative temperature coefficient current flows is used for replacing a resistor in the traditional process, so that a positive temperature coefficient amplifier with a larger temperature coefficient can be obtained, and the problem that when the traditional resistor is used as a load and a larger positive temperature coefficient amplifier is needed, the temperature compensation range is insufficient is solved.
Further, the tail current tube circuit comprises a first input pair tube adjusting tube M5 connected in parallel to M1, a second input pair tube adjusting tube M6 connected in parallel to M2, a first load pair tube adjusting tube M7 connected in parallel to M3 and a second load pair tube adjusting tube M8 connected in parallel to M4, wherein the drain of M5 is connected with the drain of M1, the drain of M6 is connected with the drain of M2, the source of M7 is connected with the drain of M3, the source of M8 is connected with the drain of M4, and the gates of M3 and M4 are respectively connected to a third bias voltage.
The positive temperature coefficient amplifier has the advantages that through improvement of the gain amplification circuit, the positive temperature coefficient is reflected no matter in input transconductance or load impedance, namely the gain of the amplifier with the structure can obtain a larger positive temperature coefficient.
Further, the ptc current circuit includes a ptc current source I1, a ptc current input pair M11 and M12, and a ptc current output adjustment tube M16, wherein the gate of M11 is connected to the gate of M12, the sources of M11 and M12 are grounded, the current of the ptc current source I1 passes through M11, the M12 copies the current of M11 and outputs the current to the ptc current output adjustment tube M16, the gate voltage of M11 is connected to the gate of the amplifier adjustment tube M0 as a first bias voltage, and the gate voltage of M16 is connected to the gates of the first load pair adjustment tube M7 and the second load pair adjustment tube M8 as a third bias voltage.
The beneficial effect of the above further scheme is that by setting the first bias voltage and the third bias voltage with positive temperature coefficients, the sum of the current flowing through the amplifier adjusting tube M0 and the current flowing through the first load pair tube adjusting tube M7 and the second load pair tube adjusting tube M8 is a positive temperature coefficient current and is equal at any temperature.
Further, the negative temperature coefficient current circuit comprises a negative temperature coefficient current source I2, a negative temperature coefficient current input pair tube M13 and M14, and a negative temperature coefficient current output adjusting tube M15, wherein the grid of M13 is connected with the grid of M14, the sources of M13 and M14 are grounded, the current of the negative temperature coefficient current source I2 passes through M13, and the current of M13 is copied by M14 and output to the negative temperature coefficient current output adjusting tube M15.
The beneficial effects of the above further scheme are that the currents flowing through the first input pair transistor M5 and the second input pair transistor M6 have negative temperature coefficient characteristics by the second bias voltage having a negative temperature coefficient, and according to the kirchhoff's law, the currents of M5 and M6 are injected into the amplifier load pair transistors M3 and M4, so that the load-side transconductance has negative temperature coefficient characteristics, and the load impedance also has positive temperature characteristics.
Furthermore, the variable temperature coefficient current circuit comprises a first selection switch group and a second selection switch group, wherein the first selection switch group and the second selection switch group both comprise a plurality of groups of current replica tubes and switch tubes, the source electrode of each group of current replica tubes is connected to a system power supply, and the drain electrode of each group of current replica tubes is connected to the source electrode of the switch tube; the grids of the multiple groups of current copying tubes in the first selection switch group are connected with the grid of a positive temperature coefficient current output adjusting tube M16, and the grids of the multiple groups of current copying tubes in the second selection switch group are connected with the grid of a negative temperature coefficient current output adjusting tube M15; the output end of the variable temperature coefficient current circuit is connected to the drain electrode of the output adjusting tube M10 of the variable temperature coefficient current circuit, a second bias voltage is generated and connected to the grids of the first input pair tube adjusting tube M5 and the second input pair tube adjusting tube M6, and the source electrode of the output adjusting tube M10 of the variable temperature coefficient current circuit is grounded.
The beneficial effect of the above scheme is that the amplifier can obtain currents with different temperature coefficients by the configuration of different switch tubes, thereby realizing the function of adjusting the gain temperature coefficient of the amplifier.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of a conventional amplifier circuit.
FIG. 2 is a schematic diagram of an amplifier gain circuit according to the present invention.
FIG. 3 is a schematic diagram of a bias circuit according to an embodiment of the invention.
Detailed Description
Hereinafter, the term "comprising" or "may include" used in various embodiments of the present invention indicates the presence of the invented function, operation or element, and does not limit the addition of one or more functions, operations or elements. Furthermore, as used in various embodiments of the present invention, the terms "comprises," "comprising," "includes," "including," "has," "having" and their derivatives are intended to mean that the specified features, numbers, steps, operations, elements, components, or combinations of the foregoing, are only meant to indicate that a particular feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as first excluding the existence of, or adding to the possibility of, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
In various embodiments of the invention, the expression "or" at least one of a or/and B "includes any or all combinations of the words listed simultaneously. For example, the expression "a or B" or "at least one of a or/and B" may include a, may include B, or may include both a and B.
Expressions (such as "first", "second", and the like) used in various embodiments of the present invention may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present invention.
It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. In contrast, when one constituent element is "directly connected" to another constituent element, it is understood that there is no third constituent element between the first constituent element and the second constituent element.
The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the invention. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
A gain amplifier for increasing the variation range of positive temperature coefficient comprises an amplifier circuit and an amplifier bias circuit,
the amplifier circuit comprises a gain circuit and a tail current tube circuit, wherein the output of the tail current tube circuit is connected to the gain circuit;
the amplifier bias circuit comprises a variable temperature coefficient current circuit, a positive temperature coefficient current circuit and a negative temperature coefficient current circuit;
the input end and the output end of the positive temperature coefficient current circuit and the output end of the variable temperature coefficient current circuit are respectively connected to the tail current tube circuit.
In particular, the method of manufacturing a semiconductor device,
as shown in fig. 2, the gain circuit includes amplifier differential input pair transistors M1 and M2, amplifier load pair transistors M3 and M4, and amplifier tuning transistor M0, where the source of M3 is connected to the drain of M1, and the source of M4 is connected to the drain of M2; the drain of M0 is connected to the sources of M1 and M2, the source of M0 is grounded, and the drains and gates of M3 and M4 are connected to the system power supply.
The tail current tube circuit comprises a first input pair tube adjusting tube M5 connected in parallel to M1, a second input pair tube adjusting tube M6 connected in parallel to M2, a first load pair tube adjusting tube M7 connected in parallel to M3 and a second load pair tube adjusting tube M8 connected in parallel to M4, wherein the drain of M5 is connected with the drain of M1, the drain of M6 is connected with the drain of M2, the source of M7 is connected with the drain of M3, and the source of M8 is connected with the drain of M4.
M0 is biased by VB1 to produce a positive temperature coefficient current. M5, M6 are biased by VB2 to generate negative temperature coefficient currents. M7, M8 are biased by VB3 to generate positive temperature coefficient current.
As shown in fig. 2, the first bias voltage VB1 and the third bias voltage VB3 with positive temperature coefficient characteristics are set so that the current flowing through M0, and the current flowing through M1 and M2, and the current flowing through M7 and M8 are both positive temperature coefficient currents and equal at any temperature, that is, the current magnitudes satisfy the following relationship,
wherein, IM0、IM1、IM2、IM3、IM4、IM5、IM6、IM7、IM8The currents flowing through M0-M8, respectively.
The second bias voltage VB2 having a negative temperature coefficient characteristic is set so that the currents flowing through M5 and M6 are negative temperature coefficient currents, and,
according to kirchhoff's law, the incoming current is equal to the outgoing current, and,
therefore, the negative temperature coefficient current flowing through M5 and M6 is forcibly injected into M3 and M4, that is,
and wherein
；
It can thus be derived:
therefore, the negative temperature coefficients of M5 and M6 flow into M3 and M4, and transconductance with the negative temperature coefficients is formed as the load of the amplifier, so that the positive temperature coefficient of the amplifier is enlarged.
And, the small signal voltage gain of the amplifier is,
wherein, Av is the small signal voltage gain of the amplifier, GM12And GM34The transconductances of the differential input pair transistors M1 and M2 and the load pair transistors M3 and M4 respectively are positive temperature coefficient currents, so that the transconductances G of the differential input pair transistors M1 and M2 and the load pair transistors M3 and M4 flow through the M1 and M2 respectivelyM12Also positive temperature coefficient. M3 and M4 flow currents of M5 and M6, and the temperature coefficients are set to be negative temperature coefficients, so that the transconductance of the currents is negative temperature coefficients. Due to GM34Appears in the denominator, so that the positive temperature characteristic is also shown in the small signal voltage gain formula. Therefore, the voltage gain shows a positive temperature coefficient in both input transconductance and load impedance, namely the gain of the structural amplifier can obtain a larger positive temperature coefficient.
In the above-described embodiment, the first bias voltage VB1, the second bias voltage VB2, and the third bias voltage VB3 are respectively provided by the bias circuits of the amplifiers, as shown in fig. 3,
the positive temperature coefficient current circuit comprises a positive temperature coefficient current source I1, positive temperature coefficient current input pair transistors M11 and M12 and a positive temperature coefficient current output adjusting tube M16, wherein the grid electrode of M11 is connected with the grid electrode of M12, the source electrodes of M11 and M12 are grounded, the current of the positive temperature coefficient current source I1 passes through M11, the M12 copies the current of M11 and outputs the current to the positive temperature coefficient current output adjusting tube M16, the grid voltage of M11 is connected to the grid electrode of the amplifier adjusting tube M0 as a first bias voltage VB1, the grid voltage of M16 is connected to the first load pair transistor adjusting tube as a third bias voltage VB3The whole tube M7 and the second load pair tube adjust the grid of the tube M8. Since the M7 and M8 currents are both derived from the same current source I1 by copying, it can be ensured that at any temperature they are substantially equal, i.e. IM0=IM7+IM8。
The negative temperature coefficient current circuit comprises a negative temperature coefficient current source I2, a negative temperature coefficient current input pair tube M13 and M14 and a negative temperature coefficient current output adjusting tube M15, wherein the grid of M13 is connected with the grid of M14, the sources of M13 and M14 are grounded, the current of the negative temperature coefficient current source I2 passes through M13, and the M14 copies the current of M13 and outputs the current to the negative temperature coefficient current output adjusting tube M15.
In the present embodiment, the variable temperature coefficient current circuit is exemplified by three pairs of selection switches,
the gates of M21, M22 and M23 are respectively connected with the gate of M16, the current of M16 is duplicated, and the output current is positive temperature coefficient current;
the gates of M24, M25 and M26 are respectively connected with the gate of M15, the current of M15 is duplicated, and the output current is negative temperature coefficient current.
M31, M32, M33, M34, M35 and M36 are switching tubes which are respectively connected in series with M21, M22, M23, M24, M25 and M26, and can control whether the currents of M21, M22, M23, M24, M25 and M26 flow into the variable temperature coefficient current circuit output adjusting tube M10. Different switch configurations of the switch tube can enable the amplifier to obtain voltage gains with different temperature coefficients, specifically:
if M31, M32 and M33 are all closed, the current flowing into the M10 tube is all negative temperature coefficient, so that GM34Is a negative temperature coefficient, so that the obtained small signal voltage gain has the maximum positive temperature coefficient;
if M34, M35 and M36 are all closed, the current flowing into the M10 tube is all positive temperature coefficient current, the generated bias voltage makes the current flowing through M3, M4, M5 and M6 be positive temperature coefficient current, so that G is enabled to be positive temperature coefficient currentM34Is a positive temperature coefficient due to GM12Also positive temperature coefficient, according to the amplifier small signal voltage gain formula
It can be seen that the two positive temperature coefficients cancel each other out, so that the resulting small-signal voltage gain has a zero temperature coefficient. Therefore, through different settings of the switch tube, currents with different temperature coefficients can be obtained, so that the function of adjusting the gain temperature coefficient of the amplifier is achieved, and the more the set selection switch sets are, the higher the adjustment and control precision is.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A gain amplifier for increasing the variation range of positive temperature coefficient comprises an amplifier circuit and an amplifier bias circuit,
the amplifier circuit comprises a gain circuit and a tail current tube circuit, and the output of the tail current tube circuit is connected to the gain circuit;
the amplifier bias circuit comprises a variable temperature coefficient current circuit, a positive temperature coefficient current circuit and a negative temperature coefficient current circuit; the outputs of the positive temperature coefficient current circuit and the negative temperature coefficient current circuit are respectively connected to the variable temperature coefficient current circuit;
the input end and the output end of the positive temperature coefficient current circuit and the output end of the variable temperature coefficient current circuit are respectively connected to the tail current tube circuit.
2. The gain amplifier for improving the PTC (positive temperature coefficient) variation range according to claim 1, wherein the gain circuit comprises amplifier differential input pair transistors M1 and M2, amplifier load pair transistors M3 and M4, and an amplifier adjusting transistor M0, wherein a source of M3 is connected with a drain of M1, and a source of M4 is connected with a drain of M2; the drain of M0 is connected with the sources of M1 and M2, the source of M0 is grounded, the drains and gates of M3 and M4 are connected with a system power supply, and the gates of M1 and M2 are respectively connected with a second bias voltage.
3. The gain amplifier of claim 2, wherein the tail current tube circuit comprises a first input pair tube adjusting tube M5 connected in parallel to M1, a second input pair tube adjusting tube M6 connected in parallel to M2, a first load pair tube adjusting tube M7 connected in parallel to M3, and a second load pair tube adjusting tube M8 connected in parallel to M4, wherein a drain of M5 is connected to a drain of M1, a drain of M6 is connected to a drain of M2, a source of M7 is connected to a drain of M3, a source of M8 is connected to a drain of M4, and gates of M3 and M4 are respectively connected to a third bias voltage.
4. The gain amplifier for improving the PTC (positive temperature coefficient) variation range according to claim 3, wherein the PTC current circuit comprises a PTC current source I1, a PTC current input pair M11 and M12, and a PTC current output adjustment tube M16, wherein the gate of M11 is connected to the gate of M12, the sources of M11 and M12 are grounded, the current of the PTC current source I1 passes through M11, the M12 copies the current of M11 and outputs the current to the PTC current output adjustment tube M16, the gate voltage of M11 is connected to the gate of the amplifier adjustment tube M0 as a first bias voltage, and the gate voltage of M16 is connected to the gates of the first load pair M7 and the second load pair M8 as a third bias voltage.
5. The gain amplifier for improving the variation range of the positive temperature coefficient according to claim 4, wherein the negative temperature coefficient current circuit comprises a negative temperature coefficient current source I2, a pair of negative temperature coefficient current input transistors M13 and M14, and a negative temperature coefficient current output adjusting transistor M15, wherein the gate of M13 is connected with the gate of M14, the sources of M13 and M14 are grounded, the current of the negative temperature coefficient current source I2 passes through M13, and the M14 copies the current of M13 and outputs the current to the negative temperature coefficient current output adjusting transistor M15.
6. The gain amplifier for improving the variation range of the positive temperature coefficient according to claim 5, wherein the variable temperature coefficient current circuit comprises a first selection switch group and a second selection switch group, the first selection switch group and the second selection switch group both comprise a plurality of groups of current replica tubes and switch tubes, the source electrode of each group of current replica tubes is connected to a system power supply, and the drain electrode is connected to the source electrode of the switch tube; the grids of the multiple groups of current copying tubes in the first selection switch group are connected with the grid of a positive temperature coefficient current output adjusting tube M16, and the grids of the multiple groups of current copying tubes in the second selection switch group are connected with the grid of a negative temperature coefficient current output adjusting tube M15; the output end of the variable temperature coefficient current circuit is connected to the drain electrode of the output adjusting tube M10 of the variable temperature coefficient current circuit, a second bias voltage is generated and connected to the grids of the first input pair tube adjusting tube M5 and the second input pair tube adjusting tube M6, and the source electrode of the output adjusting tube M10 of the variable temperature coefficient current circuit is grounded.
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| CN114650019A (en) * | 2022-05-20 | 2022-06-21 | 成都信息工程大学 | Amplifier circuit with arbitrary gain temperature coefficient |
| CN114879801A (en) * | 2022-06-02 | 2022-08-09 | 江苏集萃智能集成电路设计技术研究所有限公司 | Current generation circuit with adjustable temperature coefficient |
| CN114924610A (en) * | 2022-06-02 | 2022-08-19 | 江苏集萃智能集成电路设计技术研究所有限公司 | Positive temperature coefficient current generating circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114650019A (en) * | 2022-05-20 | 2022-06-21 | 成都信息工程大学 | Amplifier circuit with arbitrary gain temperature coefficient |
| CN114650019B (en) * | 2022-05-20 | 2022-09-20 | 成都信息工程大学 | Amplifier circuit with arbitrary gain temperature coefficient |
| CN114879801A (en) * | 2022-06-02 | 2022-08-09 | 江苏集萃智能集成电路设计技术研究所有限公司 | Current generation circuit with adjustable temperature coefficient |
| CN114924610A (en) * | 2022-06-02 | 2022-08-19 | 江苏集萃智能集成电路设计技术研究所有限公司 | Positive temperature coefficient current generating circuit |
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| CN112039444B (en) | 2021-02-19 |
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Denomination of invention: A gain amplifier for improving the variation range of positive temperature coefficient Effective date of registration: 20210906 Granted publication date: 20210219 Pledgee: Bank of China Limited Chengdu Qingyang sub branch Pledgor: CHENGDU IRIDIUM COMMUNICATIONS Co.,Ltd. Registration number: Y2021510000202 |