CN114679170A - Signal conversion circuit - Google Patents
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- CN114679170A CN114679170A CN202011546839.7A CN202011546839A CN114679170A CN 114679170 A CN114679170 A CN 114679170A CN 202011546839 A CN202011546839 A CN 202011546839A CN 114679170 A CN114679170 A CN 114679170A
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Abstract
The invention relates to the technical field of integrated circuits, and provides a signal conversion circuit, which firstly utilizes an amplification module to carry out proportional amplification on input voltage so as to generate intermediate voltage; secondly, sampling the intermediate signal by using an output module based on the pulse signal; and generating a pulse signal provided to the output module according to the proportionality coefficient of the amplifying module through a control module respectively connected with the amplifying module and the output module, so that the duty ratio of the pulse signal is proportional to the proportionality coefficient of the amplifying module. Therefore, the cost can be saved, and the output precision and the reliability of the circuit can be improved.
Description
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a signal conversion circuit.
Background
With the development of modern communication technology, the requirement for the precision of signal transmission between systems in an integrated circuit system is higher and higher. For example, in a digital-analog hybrid circuit or a power management circuit, an accurate reference voltage can provide an accurate reference to the ground for the whole system, and an accurate reference point is required for overvoltage protection, overcurrent protection, overheat protection, an error amplifier, a comparator and accurate current of the system. However, when the reference voltage signal is small, due to interference such as system error, detection precision, parasitic parameters of layout and wiring, etc., the data received by the system end and the signal source data are prone to have large deviation, so that the accuracy of signal transmission is affected, the performance of the system is reduced, and even the system is abnormal in function.
In a signal conversion circuit in the prior art, a reference voltage is converted into a current to be output, the suppression capability of parasitic interference is enhanced by converting the reference voltage and performing signal transmission between modules on the converted current, and if the current is restored to the reference voltage in a local module, accurate transmission of the reference voltage is finally achieved, as shown in fig. 1. Fig. 1 is a signal conversion circuit in the prior art, which includes: the current mirror circuit comprises a reference power supply for providing a reference voltage VREF, an error amplifier EA, a capacitor Cc, a current mirror structure consisting of a transistor M1, a transistor M2, a transistor M3, a transistor M4, a transistor M5 and a transistor M6, a transistor M7, a resistor R1 and a resistor R2, wherein the reference power supply is used for providing the reference voltage VREF to the non-inverting input end of the error amplifier EA, the output end of the error amplifier EA is connected with the control end of the transistor M7, the source end of the transistor M7 is connected to the inverting input end of the error amplifier EA in a feedback mode, and the precision of the current mirror structure replica current I1 is adjusted by adjusting the width-depth ratio of each transistor in the current mirror structure, namely the mirror current I2 and the mirror current I3 are controlled, and the magnitude of the output voltage Vo is controlled. However, when the VREF voltage is small, vos of the amplifier EA itself causes a large deviation of its output, which reduces the system accuracy.
Fig. 2 is a signal conversion circuit improved on the basis of fig. 1 in the prior art. The signal conversion circuit basically adopts the structure of the signal conversion circuit shown in fig. 1, except that a resistor R3 is added, the resistor R3 is connected between the drain terminal of the transistor M4 and the drain terminal of the transistor M7, although the lowest operating voltage VIN of the circuit is reduced to about 2.45 v by the added resistor R3, the chip area of an integrated circuit is increased, meanwhile, the resistor R3 is easily affected by process variation, the bias voltage formed by the R3 on the M4, M5 and M6 can change with the process and the temperature, the M4, M5 and M6 can possibly enter a linear region, and the effect of accurately copying the current by a current mirror of the cascde structure is greatly weakened. Similarly, when the VREF voltage is small, vos of the amplifier EA itself causes a large deviation in its output, reducing the system accuracy.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a signal conversion circuit, which can save cost and improve the output precision and reliability of the circuit.
The invention provides a signal conversion circuit, comprising:
the amplifying module is used for amplifying the input voltage in proportion to generate an intermediate voltage;
the input end of the output module is connected with the output end of the amplifying module and used for sampling the intermediate signal based on the pulse signal; and
and the control module is respectively connected with the amplifying module and the output module and is used for generating the pulse signal provided to the output module according to the proportionality coefficient of the amplifying module so that the duty ratio of the pulse signal is proportional to the proportionality coefficient of the amplifying module.
Preferably, the aforementioned amplification module comprises:
a first amplifier, wherein the non-inverting input terminal of the first amplifier is used for obtaining the input voltage, and the output terminal of the first amplifier provides the intermediate voltage;
and the second resistor and the third resistor are connected between the output end of the first amplifier and the ground in series, and the connecting node of the second resistor and the third resistor is connected with the inverting input end of the first amplifier.
Preferably, the signal conversion circuit further includes:
a voltage-current conversion module connected between the amplification module and the output module for performing voltage-current conversion on the intermediate voltage to obtain a converted current,
the output module samples the conversion current based on the pulse signal, and the duty ratio of the pulse signal and the gain coefficient of the input voltage amplification are reciprocal.
Preferably, the pressure-flow conversion module comprises:
a first current mirror including a first transistor and a second transistor, the first current mirror having a first path connected to a drain terminal of the first transistor and a second path connected to a drain terminal of the second transistor,
the first path is used for providing the conversion current according to the middle, and the second path is used for outputting the mirror image current of the conversion current.
Preferably, the pressure-flow conversion module further comprises:
a second amplifier having a non-inverting input terminal connected to the output terminal of the first amplifier for receiving the intermediate voltage,
the first path includes a third transistor and a first resistor connected in series between the drain terminal of the first transistor and ground, a control terminal of the third transistor is connected to the output terminal of the second amplifier, and a connection node of the third transistor and the first resistor is connected to the inverting input terminal of the second amplifier.
Preferably, the output module comprises:
the second current mirror comprises a fourth transistor and a fifth transistor, the second path of the first current mirror is connected with the drain terminal of the fourth transistor, and the drain terminal of the fifth transistor is used as the output terminal of the signal conversion circuit;
and the switch module is connected with the output end of the control module, is connected with the pulse signal, is connected between the grid end of the fourth transistor and the grid end of the fifth transistor, and is used for controlling the on-off between the grid end of the fourth transistor and the grid end of the fifth transistor.
Preferably, the aforementioned switch module is a relay or a power semiconductor switching device.
Preferably, at least one of the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor is a metal oxide semiconductor field effect transistor.
Preferably, at least one of the first transistor and the second transistor is a P-type metal oxide semiconductor field effect transistor.
Preferably, at least one of the third transistor, the fourth transistor, and the fifth transistor is an N-type metal oxide semiconductor field effect transistor.
The invention has the beneficial effects that: the signal conversion circuit provided by the invention firstly utilizes the amplification module to carry out proportional amplification on the input voltage so as to generate an intermediate voltage; secondly, sampling the intermediate signal by using an output module based on the pulse signal; and generating a pulse signal provided to the output module according to the proportionality coefficient of the amplifying module through a control module respectively connected with the amplifying module and the output module, so that the duty ratio of the pulse signal is proportional to the proportionality coefficient of the amplifying module. The circuit designs the duty ratio of the pulse signal and the gain coefficient for amplifying the input voltage, so that the average value of the signal output by duty ratio control sampling is the conversion signal corresponding to the input voltage, high-precision conversion is realized, the cost is saved, and the output precision and the reliability of the circuit are improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of a signal conversion circuit in the prior art;
FIG. 2 shows a schematic diagram of another prior art signal conversion circuit;
FIG. 3 shows a block schematic diagram of a signal conversion circuit provided in an embodiment of the present disclosure;
fig. 4 shows a block schematic diagram of a structure of a signal conversion circuit provided in another embodiment of the present disclosure;
FIG. 5 illustrates a circuit schematic of the signal conversion circuit of FIG. 4 in one embodiment;
fig. 6 shows a timing diagram of the pulse signal S0 switched in by the switch module shown in fig. 5.
Detailed Description
To facilitate an understanding of the present disclosure, the present disclosure will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present disclosure are set forth in the accompanying drawings. However, the present disclosure may be embodied in different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
According to the related art, a signal transmission error is an influence factor which cannot be ignored on the control performance of a system, so that the requirement on the precision of a signal transmitted between systems is higher and higher, for example, in a digital-analog hybrid circuit or a power management circuit, an accurate reference voltage can provide an accurate reference for the whole system to the ground, and overvoltage protection, overcurrent protection, overheat protection, an error amplifier, a comparator and accurate current of the system all need an accurate reference point.
Based on this, the present disclosure provides a signal conversion circuit, which designs a duty ratio of a pulse signal and a gain coefficient for amplifying an input voltage, so that an average value of a duty ratio control sampling output signal is proportional to a conversion signal corresponding to the input voltage, thereby realizing high-precision conversion, improving output precision and reliability of the circuit, and ensuring accuracy and stability of signal transmission in practical circuit application.
The present disclosure is described in detail below with reference to the accompanying drawings.
Fig. 3 shows a schematic block diagram of a signal conversion circuit provided in an embodiment of the present disclosure.
Referring to fig. 3, an embodiment of the present disclosure provides a voltage-to-voltage signal conversion circuit 100, which includes: the circuit comprises an amplifying module 110, a control module 120 and an output module 130, wherein the amplifying module 110 is configured to amplify an input voltage S11 in a proportional manner to generate an intermediate voltage S12; the input end of the output module 130 is connected to the output end of the amplifying module 110, and is configured to sample the intermediate signal S12 based on the pulse signal S0 and output S13; the control module 120 is respectively connected to the amplifying module 110 and the output module 130, and is configured to generate the pulse signal S0 provided to the output module 130 according to the scaling factor of the amplifying module 110, so that the duty ratio of the pulse signal S0 is proportional to the scaling factor of the amplifying module. The amplitude-amplified signal S13 can be used for subsequent system applications, so as to avoid the susceptibility of too small signal to interference during signal transmission and avoid generating larger error.
In a preferred embodiment, the amplifying module 110 includes, for example, a first amplifier (not shown), the non-inverting input of which is used to obtain the aforementioned input voltage S11, the inverting input of which is used to obtain samples of the intermediate voltage S12 provided at the output of the first amplifier, and the output module 130 performs sampling output S13 (in this embodiment, output S13 is a voltage signal) by using the pulse signal S0 generated according to the scaling factor of the amplifying module 110, so as to complete the shaping of the input voltage S11 into the output voltage S13.
The signal conversion circuit 100 in this embodiment designs the duty ratio of the pulse signal S0 and the gain factor for amplifying the input voltage S11, so that the average value of the duty ratio control sampling output voltage S13 is proportional to the conversion signal corresponding to the input voltage S11, thereby realizing high-precision conversion, improving the output precision and reliability of the circuit, and ensuring the accuracy and stability of signal transmission in practical circuit applications, such as in a voltage converter.
Further, if the output voltage needs to be a stable dc voltage signal, a filter device may be added after the amplifying module 110 outputs the intermediate voltage S12 to further obtain a stable converted voltage, i.e., a high-precision output voltage S13 converted corresponding to the input voltage.
Fig. 4 shows a schematic block diagram of a signal conversion circuit provided in another embodiment of the present disclosure, and fig. 5 shows a circuit schematic diagram of the signal conversion circuit shown in fig. 4 in one implementation.
Referring to fig. 4 and 5, the present disclosure provides in another embodiment a voltage to current signal conversion circuit 200 comprising: the voltage-current conversion circuit comprises an amplifying module 210, a voltage-current conversion module 240, a control module 220 and an output module 230, wherein the amplifying module 210 is used for performing proportional amplification on an input voltage V11 to generate an intermediate voltage S12; the control module 220 is respectively connected to the amplifying module 210 and the output module 230, and is configured to generate a pulse signal S0 provided to the output module 230 according to the scaling factor of the amplifying module 210; the voltage-to-current conversion module 240 is connected between the amplifying module 210 and the output module 230, and configured to perform voltage-to-current conversion on the intermediate voltage S12 to obtain a mirror current S14 of the conversion current I11; and the input terminal of the output module 230 is connected to the output terminal of the aforementioned amplifying module 210, and is used for sampling the converted current S14 based on the pulse signal S0 and outputting S13 (in this embodiment, the output S13 is a current signal), wherein the duty ratio of the pulse signal S0 is proportional to the proportionality coefficient of the aforementioned amplifying module 210.
Further, in a preferred embodiment, the duty ratio of the pulse signal S0 and the gain factor of the amplification of the input voltage S11 are reciprocal, that is, under the control of the duty ratio of the pulse signal S0, the average value of the output current S13 is the current corresponding to the input voltage S11.
Referring to fig. 5, in the present embodiment, the amplifying module 210 at least includes a first amplifier 211, a second resistor R2 and a third resistor R3,
wherein the non-inverting input terminal of the first amplifier 211 is used for obtaining the input voltage S11, and the output terminal provides the intermediate voltage S12; the second resistor R2 and the third resistor R3 are connected in series between the output terminal of the first amplifier 211 and ground, and the connection node of the second resistor R2 and the third resistor R3 is connected to the inverting input terminal of the first amplifier 211.
Further, the pressure-flow converting module 240 includes: the second amplifier 241, the first current mirror, the third transistor T3 and the first resistor R1, specifically, the first transistor T1 and the second transistor T2 constitute the first current mirror, and the first current mirror has a first path connected to the drain terminal of the first transistor T1 and a second path connected to the drain terminal of the second transistor T2, wherein the first path is used for providing the conversion current I11 according to the intermediate voltage S12, and the second path is used for outputting the mirror current S14 of the conversion current I11.
The non-inverting input terminal of the second amplifier 241 is connected to the output terminal of the first amplifier 211 for receiving the intermediate voltage S12, the first path includes a third transistor T3 and a first resistor R1 connected in series between the drain terminal of the first transistor T1 and the ground, the control terminal of the third transistor T3 is connected to the output terminal of the second amplifier 241, and the third transistor T3 is connected to the connection node of the first resistor R1 and the inverting input terminal of the second amplifier 241 to form a negative feedback loop. For providing a feedback voltage Vn. The first resistor R1 is connected to the inverting input of the second amplifier 241, so that the current I11 flowing through the first resistor R1 is equal to the feedback voltage Vn divided by the resistance of the first resistor R1.
Further, the output module 230 includes: a second current mirror and switch module SW, specifically, a fourth transistor T5 and a fifth transistor T6 form a second current mirror, a second path of the first current mirror is connected to a drain terminal of the fourth transistor T4, and a drain terminal of the fifth transistor T5 is used as an output terminal of the signal conversion circuit 200, and is configured to copy the mirror current S14 and output a mirror current S13; the switch module SW is connected to a pulse signal S0 and connected between the gate terminal of the fourth transistor T4 and the gate terminal of the fifth transistor T5, and the pulse signal S0 is used to control the on/off between the gate terminal of the fourth transistor T4 and the gate terminal of the fifth transistor T5.
Further, the first transistor T1 and the second transistor T2, the fourth transistor T4 and the fifth transistor T5 are designed to match each other, so that the ratio of the conversion current I11 to the mirror current S14 thereof is equal to the ratio of the width-to-length ratios of the first transistor T1 and the second transistor T2, and the ratio of the mirror current S14 to the mirror current S13 thereof is equal to the ratio of the width-to-length ratios of the fourth transistor T4 and the fifth transistor T5, and in a preferred embodiment of the present disclosure, for example, the ratios of the width-to-length ratios of the first transistor T1 and the second transistor T2, the fourth transistor T4 and the fifth transistor T5 are all in a matching relationship of 1:1, thereby forming an accurate current mirror matching.
Further, the switch module SW is, for example, but not limited to, a relay or a power semiconductor switch device (e.g., any one of a transistor or a thyristor).
Further, the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are all metal oxide semiconductor field effect transistors (MOS transistors for short), for example.
The signal conversion circuit 200 provided in the embodiment of the present disclosure is not limited to the circuit diagram shown in fig. 5, and other transistors such as Bipolar Junction Transistors (BJTs) may also be used in the signal conversion circuit 200 of the present disclosure. In the present embodiment, the first transistor T1 and the second transistor T2 are both PMOS transistors, for example, and the third transistor T3, the fourth transistor T4 and the fifth transistor T5 are all NMOS transistors, for example, for illustration.
Fig. 6 shows a timing diagram of the pulse signal S0 switched in by the switch module shown in fig. 5.
Referring to fig. 5, the signal conversion circuit 200 according to the embodiment of the disclosure uses the amplifying module 210 to amplify the input voltage S11 by m times through the first amplifier 211 (assuming that the amplification gain coefficient of the first amplifier 211 is m, for example, and m ≧ 1), where m ═ R2+ R3)/R2, then the resulting intermediate voltage:
S12＝S11*m (1)
then, the voltage-current conversion module 240 obtains a conversion current I11 corresponding to the voltage S12, for example, the value is:
I11＝S12/R0 (2)
where R0 is the equivalent impedance in the pressure-to-flow conversion module 240.
In the voltage-to-current conversion module 240, the feedback voltage Vn is controlled by the feedback loop formed by the second amplifier 241 and the third transistor T3 to follow the change of the intermediate voltage S12, and the circuit connection relationship in fig. 5 shows that
I11＝Vn/R1＝S12/R1 (3)
Wherein R1 is represented as the resistance of the first resistor R1.
According to the first current mirror structure, S14/I11 ═ K, K being a constant, preferably K being 1, i.e. K is
S14＝I11 (4)
Through the first current mirror, a mirror current S14 of the conversion current I11 corresponding to the voltage S12 is obtained for the subsequent modules.
Referring to fig. 5 and 6, assuming that the period of the pulse signal S0 is T, the proportional relationship between the on-time T and the period T (the duty ratio of the pulse signal S0) in each period is, for example, 1/m.
In the output module 230 of the present embodiment, the fourth transistor T4 and the fifth transistor T5 are in a mirror current relationship, and if the switch module SW is not provided, the mirror current S14 is equal to the mirror current S13 in value. By connecting a switching module SW in series with the paths of the mirror current S14 and the mirror current S13, and controlling the output module 230 to be in an intermittent on-state by the duty ratio 1/m of the pulse signal S0 and the gain coefficient m amplified by the input voltage S11 being reciprocal, the obtained mirror current S13 has a pulse (pulse) waveform, and the average value is:
AVE_S13＝S14/m (5)
combining the above formulas (1) to (4), and obtaining the following product after finishing and simplification:
AVE_S13＝S11/R0 (6)
that is, the average value of the mirror current S13 output by the signal conversion circuit 100 is the current corresponding to the input voltage S11, so that the purposes of high-precision conversion and stable output are achieved.
In addition, the signal conversion circuit in the above description takes the voltage conversion current as an example, and the output current is a digital pulse signal, which can be directly applied to the subsequent circuit scenarios such as a digital-to-analog hybrid circuit or a power management circuit.
In the signal conversion circuit 200 provided in the embodiment of the present disclosure, first, the first amplifier 211 in the amplifying module 210 is used to amplify the input voltage S11 in proportion; then, the input end of the voltage-current conversion module 240 is connected with the output end of the amplification module 210, and voltage-current conversion is performed on the intermediate voltage S12 to obtain a conversion current I11; then, the output module 230 connected to the voltage-to-current conversion module 240 is used to access a pulse signal S0 with a certain duty ratio, and the output module 230 is controlled to sample the output current S13 in an intermittently conducting circuit state, specifically, in an embodiment, the duty ratio 1/m of the pulse signal S0 and the gain coefficient m amplified by the input voltage S11 are reciprocal, so that the average AVE _ S13 of the mirror current S13 of the output conversion current I11 is the current corresponding to the input voltage S11.
In summary, the signal conversion circuit provided in the embodiment of the present disclosure designs the duty ratio of the pulse signal S0 and the gain coefficient for amplifying the input voltage S11, so that the average value of the duty ratio control sampling output signal S13 is proportional to the conversion signal corresponding to the input voltage S11, thereby achieving high-precision conversion, improving the output precision and reliability of the circuit, and simultaneously ensuring the accuracy and stability of signal transmission in practical circuit applications, such as in a voltage converter.
It should be noted that in the description of the present disclosure, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientation or positional relationship, are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present disclosure.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present disclosure, and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention as herein taught are within the scope of the present disclosure.
Claims (10)
1. A signal conversion circuit, comprising:
the amplifying module is used for amplifying the input voltage in proportion to generate an intermediate voltage;
the input end of the output module is connected with the output end of the amplification module and is used for sampling the intermediate signal based on a pulse signal; and
and the control module is respectively connected with the amplifying module and the output module and is used for generating the pulse signal provided to the output module according to the proportionality coefficient of the amplifying module so that the duty ratio of the pulse signal is proportional to the proportionality coefficient of the amplifying module.
2. The signal conversion circuit of claim 1, wherein the amplification module comprises:
the non-inverting input end of the first amplifier is used for acquiring the input voltage, and the output end of the first amplifier provides the intermediate voltage;
and the second resistor and the third resistor are connected between the output end of the first amplifier and the ground in series, and the connecting node of the second resistor and the third resistor is connected with the inverting input end of the first amplifier.
3. The signal conversion circuit of claim 1, further comprising:
a voltage-current conversion module connected between the amplification module and the output module for performing voltage-current conversion on the intermediate voltage to obtain a conversion current,
the output module samples the conversion current based on the pulse signal, and the duty ratio of the pulse signal and the gain coefficient of the input voltage amplification are reciprocal.
4. The signal conversion circuit of claim 3, wherein the voltage-to-current conversion module comprises:
a first current mirror comprising a first transistor and a second transistor, the first current mirror having a first path connected to the drain terminal of the first transistor and a second path connected to the drain terminal of the second transistor,
the first path is used for providing the conversion current according to the intermediate voltage, and the second path is used for outputting the mirror image current of the conversion current.
5. The signal conversion circuit of claim 4, wherein the voltage-to-current conversion module further comprises:
a second amplifier having a non-inverting input connected to the output of the first amplifier for receiving the intermediate voltage,
the first path includes a third transistor and a first resistor connected in series between a drain terminal of the first transistor and a ground, a control terminal of the third transistor is connected to an output terminal of the second amplifier, and the third transistor is connected to a connection node of the first resistor and an inverting input terminal of the second amplifier.
6. The signal conversion circuit of claim 5, wherein the output module comprises:
the second current mirror comprises a fourth transistor and a fifth transistor, a second path of the first current mirror is connected with a drain terminal of the fourth transistor, and the drain terminal of the fifth transistor is used as an output terminal of the signal conversion circuit;
and the switch module is connected with the output end of the control module, is accessed to the pulse signal and is connected between the grid end of the fourth transistor and the grid end of the fifth transistor, and the pulse signal is used for controlling the on-off between the grid end of the fourth transistor and the grid end of the fifth transistor.
7. The signal conversion circuit of claim 6, wherein the switching module is a relay or a power semiconductor switching device.
8. The signal conversion circuit according to claim 6, wherein at least one of the first transistor, the second transistor, the third transistor, the fourth transistor, and the fifth transistor is a metal oxide semiconductor field effect transistor.
9. The signal conversion circuit according to claim 8, wherein any one of the first transistor and the second transistor is a P-type metal oxide semiconductor field effect transistor.
10. The signal conversion circuit according to claim 8, wherein any one of the third transistor, the fourth transistor, and the fifth transistor is an N-type metal oxide semiconductor field effect transistor.
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| CN101557203A (en) * | 2009-03-20 | 2009-10-14 | 深圳市民展科技开发有限公司 | Power amplifier with overcurrent protection |
| CN102291104A (en) * | 2011-06-09 | 2011-12-21 | 电子科技大学 | High-power pulse current/voltage generating circuit |
| CN102684652A (en) * | 2012-06-04 | 2012-09-19 | 浙江榆阳电子有限公司 | Synchronous pulse control circuit for preventing faults of microprogrammed control unit (MCU) or driving integrated circuit (IC) |
| CN102868386A (en) * | 2012-09-25 | 2013-01-09 | 中国兵器工业集团第二一四研究所苏州研发中心 | Multi-channel signal amplifying circuit of low-duty ratio narrow pulse signal and control method |
| US20150137782A1 (en) * | 2013-11-18 | 2015-05-21 | Maxim Integrated Products, Inc. | Systems and methods to monitor current in switching converters |
| CN107994897A (en) * | 2017-11-27 | 2018-05-04 | 尚睿微电子（上海）有限公司 | A kind of bias current control circuit, method and power amplification control circuit |
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