CN116418315B - Filter temperature analog circuit - Google Patents

Filter temperature analog circuit Download PDF

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Publication number
CN116418315B
CN116418315B CN202310682514.9A CN202310682514A CN116418315B CN 116418315 B CN116418315 B CN 116418315B CN 202310682514 A CN202310682514 A CN 202310682514A CN 116418315 B CN116418315 B CN 116418315B
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China
Prior art keywords
transistor
current
filter
module
electrically connected
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CN202310682514.9A
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CN116418315A (en
Inventor
彭振飞
陆航
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Smarter Microelectronics Shanghai Co Ltd
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Smarter Microelectronics Shanghai Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H03H11/48—One-port networks simulating reactances
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H03H11/53—One-port networks simulating resistances; simulating resistance multipliers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/54—Modifications of networks to reduce influence of variations of temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

Abstract

The embodiment of the application provides a filter temperature simulation circuit, wherein the circuit at least comprises a current simulation module and a thermal resistance simulation module; the current simulation module is electrically connected with the power supply at one end and the thermal resistance simulation module at the other end, and is used for simulating and outputting the filter current of the filter; wherein the filter current changes with the change of the filter temperature; the thermal resistance simulation module is connected in series with the current simulation module, and is used for simulating a thermistor of the filter and outputting filter voltage related to the temperature of the filter according to the current of the filter.

Description

Filter temperature analog circuit
Technical Field
Embodiments of the present application relate to the field of analog integrated circuit technology, and relate to, but are not limited to, a filter temperature analog circuit.
Background
In the development process of a wireless communication protocol from 3G (Generation) to 4G and 5G, the transmission frequency of radio frequency signals is higher and higher, and the risk of burning out a filter due to heating is increased due to the high power of a power device. In order to ensure the reliability of the radio frequency front end module, the power of the filter needs to be continuously monitored to protect the filter from being burnt out due to excessive heating under extreme conditions.
At present, the prior art often directly detects the temperature of a power device, such as a thermistor or a triode and the like, samples the temperature of a temperature sensitive device, and converts a temperature signal into an electrical signal which is convenient to process, thereby realizing quick response to temperature change and protection to the power device. However, in the radio frequency front end module, because of the limitation of the manufacturing process, the triode cannot be integrated in the filter, so that the temperature of the filter cannot be directly detected, the sensitivity of the thermistor is low, and the detection precision is difficult to ensure.
Disclosure of Invention
Based on the problems in the related art, embodiments of the present application provide a filter temperature analog circuit.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a filter temperature simulation circuit, which at least comprises a current simulation module and a thermal resistance simulation module;
the current simulation module is electrically connected with the power supply at one end and the thermal resistance simulation module at the other end, and is used for simulating and outputting the filter current of the filter; wherein the filter current changes with the change of the filter temperature;
the thermal resistance simulation module is connected in series with the current simulation module, and is used for simulating a thermistor of the filter and outputting filter voltage related to the temperature of the filter according to the current of the filter.
In some embodiments, the current analog module includes at least a first transistor and a current module;
the first end of the first transistor is electrically connected with the power supply, the second end of the first transistor is respectively and electrically connected with the thermal resistance simulation module and the positive electrode of the current module, and the negative electrode of the current module is grounded;
the third end of the first transistor is electrically connected with the first control port; the first control port is used for providing voltage for a third end of the first transistor.
In some embodiments, the current analog module further comprises a second transistor;
the first end of the second transistor is electrically connected with the second end of the first transistor and the positive electrode of the current module, the second end of the second transistor is electrically connected with the thermal resistance simulation module, and the third end of the second transistor is electrically connected with the second control port; the second control port is used for providing voltage for the third end of the second transistor.
In some embodiments, the circuit further comprises a third transistor; the circuit is used for being electrically connected with the power amplifier, and the output end of the power amplifier is electrically connected with the filter; the power amplifier comprises at least an amplifying transistor;
a first end of the third transistor is electrically connected with a power supply, a second end of the third transistor is connected with a third end of the amplifying transistor, and the third end of the third transistor is connected with the first control port; the output current of the second end of the first transistor is in a proportional relation with the output current of the second end of the third transistor, and the output current of the second end of the third transistor is the bias current of the amplifying transistor;
the output current of the second end of the first transistor is used for simulating the bias current of the amplifying transistor;
the output current of the current module is used for simulating the quiescent current of the amplifying transistor.
In some embodiments, the current of the second transistor is the difference between the output current of the second terminal of the first transistor and the output current of the current module, the current of the second transistor being used to simulate the filter current.
In some embodiments, the circuit further comprises a heat capacity simulation module comprising at least a simulated capacitance; the thermal resistance simulation module at least comprises a simulation resistor;
one end of the analog resistor is connected with the current analog module, and the other end of the analog resistor is connected with the analog capacitor; the other end of the analog capacitor is grounded; the analog capacitor is connected with the analog resistor in parallel;
the analog capacitance is used for simulating the heat capacity of the filter.
In some embodiments, the circuit further comprises an operational amplifier comprising a first input, a second input, and an operational amplifier output;
the second end of the third transistor is electrically connected with the first input end of the operational amplifier and the power amplifier respectively, the second input end of the operational amplifier is electrically connected with the second end of the first transistor, and the operational amplifier output end of the operational amplifier is electrically connected with the second control port.
In some embodiments, the circuit further comprises a fourth transistor, a control transistor, and a first current module;
the first end of the fourth transistor is electrically connected with a power supply;
the second end of the fourth transistor is electrically connected with the first end of the control transistor, the second end of the control transistor is grounded, the third end of the control transistor is connected with a third control port, and the third control port is used for providing voltage for the third end of the control transistor;
a third end of the fourth transistor is electrically connected with the first control port and a third end of the third transistor respectively;
the positive electrode of the first current module is electrically connected with the second end and the third end of the fourth transistor respectively, and the negative electrode of the first current module is grounded.
In some embodiments, the circuit further comprises a reference voltage analog module and a comparator; the comparator comprises a third input end, a fourth input end and a comparison output end;
the third input end of the comparator is electrically connected with the thermal resistance simulation module, the fourth input end of the comparator is electrically connected with the reference voltage simulation module, and the comparison output end of the comparator is electrically connected with the third control port;
the reference voltage module is used for generating a reference voltage.
In some embodiments, the circuit further comprises a divider resistor;
one end of the voltage dividing resistor is electrically connected with the thermal resistance simulation module, the other end of the voltage dividing resistor is grounded, and the voltage dividing resistor is connected with the thermal resistance simulation module in parallel.
The embodiment of the application provides a protection circuit, which comprises the filter temperature analog circuit.
The embodiment of the application provides a radio frequency chip, which comprises the filter temperature analog circuit or the protection circuit.
The embodiment of the application provides electronic equipment, which comprises the filter temperature analog circuit or the protection circuit or the radio frequency chip.
According to the filter temperature simulation circuit, the filter current of the filter is simulated and output through the current simulation module, and the filter voltage related to the filter temperature is output through the thermal resistance simulation module and the filter current. Therefore, the filter temperature simulation circuit simulates components such as the current of the filter, the thermistor and the thermistor of the filter, and the like to simulate the heating condition of the filter, so that an electric signal related to the temperature of the filter is output, the temperature of the filter is indirectly obtained, a temperature detection element is not required to be integrated in the filter, and the cost and the size of the filter are reduced.
Drawings
Fig. 1 is a schematic structural diagram of a radio frequency front end according to an embodiment of the present application;
fig. 2 is a schematic diagram of a filter temperature analog circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a second structure of the filter temperature analog circuit according to the embodiment of the present application;
fig. 4 is a schematic diagram III of a structure of a filter temperature analog circuit according to an embodiment of the present application;
fig. 5 is a schematic diagram of a temperature analog circuit of a filter according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings, and the described embodiments should not be construed as limiting the present application, and all other embodiments obtained by those skilled in the art without making any inventive effort are within the scope of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict. Unless defined otherwise, all technical and scientific terms used in the embodiments of the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the present application belong. The terminology used in the embodiments of the present application is for the purpose of describing the embodiments of the present application only and is not intended to be limiting of the present application.
Based on the problems existing in the related art, the embodiment of the application provides a filter temperature simulation circuit, which indirectly obtains the temperature of a filter by simulating the heating condition of the filter, and does not need to integrate a temperature detection element in the filter, thereby reducing the cost and the size of the filter.
Referring to fig. 1, fig. 1 is a schematic diagram of a rf front end structure provided in an embodiment of the present application, as shown in fig. 1, a filter temperature analog circuit 101 is connected to a power amplifier 102, the power amplifier 102 is connected to a filter 103, and a rf signal is input to the power amplifier 102, amplified by the power amplifier 102 and filtered by the filter 103 and then output. The filter temperature analog circuit 101 can obtain the heat generation condition of the filter 103 by simulating the current input to the filter 103 by the power amplifier 102 and simulating the components such as the thermistor and the thermistor of the filter 103, thereby indirectly obtaining an electric signal (for example, a voltage signal) related to the temperature of the filter 103.
Referring next to fig. 2, fig. 2 is a schematic diagram of a filter temperature simulation circuit provided in an embodiment of the present application, and as shown in fig. 2, the filter temperature simulation circuit at least includes a current simulation module 201 and a thermal resistance simulation module 202.
The current simulation module 201 has one end electrically connected to the power supply VDD and the other end electrically connected to the thermal resistance simulation module 202, and the current simulation module 201 is configured to simulate and output the filter current I of the filter w The method comprises the steps of carrying out a first treatment on the surface of the Wherein the filter current varies with a change in filter temperature.
The thermal resistanceA simulation module 202 connected in series with the current simulation module 201, wherein the thermal resistance simulation module 202 is configured to simulate a thermistor of the filter and further configured to output a filter voltage V related to the filter temperature according to the filter current w 。
According to the embodiment of the application, components such as the current of the filter and the thermistor, the thermistor and the capacitor of the filter are simulated through the filter temperature simulation circuit, so that the heating condition of the filter is simulated, the temperature of the filter is indirectly obtained through the electric signals related to the temperature of the filter, and a temperature detection element is not required to be integrated in the filter, so that the cost is reduced, and the size of the filter is reduced.
In some embodiments, fig. 3 is a second schematic diagram of a filter temperature simulation circuit according to an embodiment of the present application, as shown in fig. 3, the current simulation module includes at least a first transistor MP1 and a current module I QC 。
A first end of the first transistor MP1 is electrically connected to the power supply VDD, and a second end of the first transistor MP2 is respectively connected to the thermal resistance simulation module 202 and the current module I QC The negative electrode of the current module is grounded. The third end of the first transistor MP1 is electrically connected with the first control port A; the first control port a is configured to provide a voltage or a current to a third terminal of the first transistor MP 1.
In some embodiments, the transistor has a first terminal that is a source, a second terminal that is a drain, and a third terminal that is a gate. The current module can be a current source, and the internal resistance of the current source is large relative to the load impedance, so that the fluctuation of the load impedance does not change the current provided by the current source.
In some embodiments, fig. 4 is a schematic diagram of a third filter temperature simulation circuit provided in the embodiments of the present application, and as shown in fig. 4, the current simulation module further includes a second transistor MP2. Wherein the first end of the second transistor MP2, the second end of the first transistor MP1 and the current module I QC A second end of the second transistor MP2 is electrically connected to the thermal resistance simulation module 202, and a third end of the second transistor MP2 is electrically connected to a second control endPort B is electrically connected, and the second control port B is configured to supply a voltage to the third terminal of the second transistor MP2.
In this embodiment, as shown in fig. 5, the filter temperature analog circuit further includes a current mirror circuit, and the filter temperature analog circuit is electrically connected to the power amplifier 301 through the current mirror circuit, and the output end of the power amplifier 301 is electrically connected to the filter 302, and inputs the radio frequency signal RF in Output via a power amplifier 301 and a filter 302.
In some embodiments, fig. 5 is a schematic diagram of a filter temperature analog circuit provided in the embodiments of the present application, and as shown in fig. 5, the power amplifier includes at least an amplifying transistor Q, and the circuit further includes a third transistor MP3. The first end of the third transistor MP3 is electrically connected to the power supply VDD, the second end of the third transistor MP3 is connected to the third end b (i.e., the base) of the amplifying transistor Q, and the third end of the third transistor MP3 is connected to the first control port a. It should be noted that the power amplifier may also include a MOS transistor, which is not limited herein.
In some embodiments, the first transistor MP1 and the third transistor MP3 form a current mirror current, and thus the output current I at the second end of the first transistor MP1 1 An output current I from the second end of the third transistor MP3 HBT In proportional relation, and the output current I of the second end of the third transistor MP3 HBT Is the bias current of the amplifying transistor Q.
In some embodiments, when the first transistor MP1 and the third transistor MP3 are the same, the output current I at the second end of the first transistor MP1 1 An output current I from the second end of the third transistor MP3 HBT Equal.
In some embodiments, the output current I is due to the second end of the first transistor MP1 1 An output current I from the second end of the third transistor MP3 HBT In proportional relation or equal, therefore, the output current I of the second end of the first transistor MP1 1 Can be used to simulate the bias current of the amplifying transistor Q, the current module I QC Is set to the output current of (a)I 2 May be used to simulate the quiescent current of the amplifying transistor Q. The current of the second transistor MP2 is equal to the output current I of the second end of the first transistor MP1 1 And the current module I QC Is the output current I of (1) 2 The difference between the current of the second transistor MP2 is used to simulate the filter current, i.e. the current that the power amplifier flows into the filter.
In some embodiments, as shown in fig. 5, the circuit further includes a heat capacity simulation module including at least a simulated capacitor C1, and the thermal resistance simulation module 202 includes at least a simulated resistor R1. One end of the analog resistor R1 is connected with the current analog module, and the other end of the analog resistor R1 is connected with the analog capacitor C1; the other end of the analog capacitor C1 is grounded; the analog capacitor C1 is connected in parallel with the analog resistor R1.
In the embodiment of the application, after determining the filter current, the analog resistor R1 converts the current into a voltage, and the voltage V related to the filter temperature can be obtained SNS 。
In some embodiments, the analog capacitor is used to simulate the heat capacity of the filter, and the heat capacity of the filter can be used to filter the signal, so that the output signal is smoother and does not have too large fluctuation; it can also be used to simulate the delay time of the temperature rise of the filter, the power increase resulting in a temperature increase being time-consuming, the time being determined by the heat capacity.
In some embodiments, as shown in fig. 5, the circuit further comprises an operational amplifier OPAMP comprising a first input 1, a second input 2 and an operational amplifier output Out1. The second terminal of the third transistor MP3 is electrically connected to the first input terminal 1 of the operational amplifier OPAMP and the power amplifier 301, the second input terminal 2 of the operational amplifier OPAMP is electrically connected to the second terminal of the first transistor MP1, and the operational amplifier output terminal Out1 of the operational amplifier OPAMP is electrically connected to the second control port B (i.e., the third terminal of the second transistor MP 2).
In some embodiments, as shown in FIG. 5, the circuit further includes a fourth transistor MP4, a control transistorTube MN1, and first current module I LIMIT . The first end of the fourth transistor MP4 is electrically connected to the power supply VDD, the second end of the fourth transistor MP4 is electrically connected to the first end of the control transistor MN1, the second end of the control transistor MN1 is grounded, the third end of the control transistor MN1 is connected to a third control port C, and the third control port C is configured to provide a voltage to the third end of the control transistor MN 1. The third terminal of the fourth transistor MP4 is electrically connected to the first control port a (i.e., the third terminal of the first transistor MP 1) and the third terminal of the third transistor MP3, respectively. The first current module I LIMIT The positive electrode of the first current module I is electrically connected with the second end and the third end of the fourth transistor MP4 respectively LIMIT The negative electrode of (2) is grounded. Wherein the fourth transistor MP4 forms a current mirror with the third transistor MP3, the first transistor MP1, so that the third transistor, the first transistor, duplicate the current of the fourth transistor in proportion; the control transistor MN1 is used for adjusting the current of the fourth transistor MP4 and further adjusting the current I HBT And I 1 。
In some embodiments, the thermal resistance simulation module 202 also includes a simulated resistance R2.
In some embodiments, the circuit further comprises a reference voltage simulation module 303 and a comparator COMP; the comparator COMP comprises a third input 3, a fourth input 4 and a comparison output Out2. The third input terminal 3 of the comparator COMP is electrically connected to the thermal resistance simulation module R2, the fourth input terminal 4 is electrically connected to the reference voltage simulation module 303, and the comparison output terminal Out2 is electrically connected to the third control port C (i.e., the control transistor MN 1).
In some embodiments, the reference voltage module 303 is configured to generate a reference voltage V REF Reference voltage V REF Is obtained by conversion from a current which is linear with temperature, for use with the thermal temperature V of the filter SNS A comparison is made.
In some embodiments, the circuit further comprises an Inverter, which is electrically connected to the comparison output Out2 of the comparator COMP.
In the embodiment of the present application, when the temperature of the filter is low, the first transistor MP1 and the third transistor MP3 amplify the current of the fourth transistor MP4 through two current mirror circuits to obtain the current I of the first transistor MP1 1 And current I of third transistor MP3 HBT At this time, the current I of the first transistor MP1 1 And current I of third transistor MP3 HBT Is smaller, so that the current of the second transistor MP2 is smaller, and the voltage V related to the temperature is output through the thermal resistance simulation module (namely the simulation resistor R2) SNS To the third input 3 of the comparator COMP, the reference voltage simulation module 303 outputs a reference voltage V REF To the fourth input 4 of the comparator COMP, the pair V of comparators COMP SNS And V REF A comparison is made.
In some embodiments, V when the filter temperature is relatively low SNS Less than V REF The comparison output terminal Out2 of the comparator COMP outputs a low level, and is converted into a high level by the Inverter, the control transistor MN1 is turned on, the current of the fourth transistor MP4 increases, the currents of the first transistor MP1 and the third transistor MP3 which amplify the current of the fourth transistor MP4 in a mirror image also increase, the temperature of the filter increases, and the temperature-related voltage V output by the thermal resistance analog module is further caused SNS And (3) increasing. When the temperature of the filter rises to a certain temperature, V SNS Greater than V REF The comparison output terminal Out2 of the comparator COMP outputs a high level, which is converted to a low level by the Inverter, the control transistor MN1 is turned off, the current of the third transistor MP3 is limited, and the current of the first transistor MP1, which mirrors the current of the third transistor MP3, is also limited, so as to avoid the further increase of the filter temperature and damage.
In some embodiments, the circuit further comprises a divider resistor R1; one end of the voltage dividing resistor R1 is electrically connected with the thermal resistance simulation module (namely the simulation resistor R2), the other end of the voltage dividing resistor R1 is grounded, and the voltage dividing resistor R1 is connected with the thermal resistance simulation module in parallel. The voltage dividing resistor R1 is used for converting current into voltage.
In some embodiments, the power amplifier includes at least a bias circuit 3011, an amplifying transistor Q, a filter capacitor C2, and an inductance L1Wherein the bias circuit 3011 is connected to the second terminal of the third transistor MP3, the power supply VDD and the third terminal b (i.e., base) of the amplifying transistor Q, respectively, the radio frequency input signal RF in After passing through the filter capacitor C2, the output of the amplifying transistor Q is amplified by the amplifying transistor and then is filtered by the filter 302, and the filtered output RF out . The collector of the amplifying transistor Q is also connected to an inductor L1, and the inductor L1 prevents higher harmonics in the radio frequency signal from leaking to the power supply VCC.
According to the embodiment of the application, the filter current of the filter is simulated and output through the current simulation module, and the filter voltage related to the temperature of the filter is output through the thermal resistance simulation module and the filter current. Therefore, the embodiment of the application simulates the heating condition of the filter through the components such as the current of the filter, the thermistor and the thermistor of the filter and the like of the filter temperature simulation circuit, so that the electric signal related to the temperature of the filter is obtained, the temperature of the filter is indirectly obtained, a temperature detection element is not required to be integrated in the filter, the cost is reduced, and the size of the filter is reduced.
The current simulation module is used for simulating the current of the filter connected with the Q. Wherein the current of MP1 is used for simulating the bias current of the amplifying transistor Q, I QC The quiescent current of the amplifying transistor Q is simulated, so that the current of the difference MP2 between the quiescent current and the amplifying transistor Q can be simulated to obtain the current flowing through the filter. Wherein I is QC Is a current reference that is not affected by temperature.
The filter thermal resistance simulation module and the heat capacity simulation module are used for simulating the thermal resistance and the heat capacity of the filter, and then the voltage V related to the thermal temperature of the filter is obtained by simulating the current, the thermal resistance and the heat capacity of the filter SNS . Therefore, the purpose of indirectly obtaining the temperature of the filter by simulating the heating condition of the filter through the circuit is achieved.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application. Any modifications, equivalent substitutions, improvements, etc. that are within the spirit and scope of the present application are intended to be included within the scope of the present application.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed.
The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (9)

1. A filter temperature simulation circuit, which is characterized by at least comprising a current simulation module and a thermal resistance simulation module;
the current simulation module is electrically connected with the power supply at one end and the thermal resistance simulation module at the other end, and is used for simulating and outputting the filter current of the filter; wherein the filter current changes with the change of the filter temperature; the circuit is connected with a power amplifier, the output end of the power amplifier is electrically connected with a filter, and the power amplifier at least comprises an amplifying transistor;
the current simulation module at least comprises a first transistor, a third transistor and a current module; the first end of the third transistor is electrically connected with a power supply, the second end of the third transistor is used for being connected with the third end of the amplifying transistor, and the third end of the first transistor and the third end of the third transistor are connected with a first control port; the output current of the second end of the third transistor is the bias current of the amplifying transistor; the output current of the second end of the first transistor is in proportional relation with the output current of the second end of the third transistor; the output current of the second end of the first transistor is used for simulating the bias current of the amplifying transistor; the output current of the current module is used for simulating the quiescent current of the amplifying transistor; the difference between the output current of the second end of the first transistor and the output current of the current module is used for simulating the filter current of the filter;
the thermal resistance simulation module is connected in series with the current simulation module, and is used for simulating a thermistor of the filter and outputting filter voltage related to the temperature of the filter according to the current of the filter.
2. The circuit of claim 1, wherein a first end of the first transistor is electrically connected to the power supply, a second end of the first transistor is electrically connected to the thermal resistance analog module and a positive electrode of the current module, respectively, and a negative electrode of the current module is grounded;
the first control port is used for providing voltage for a third end of the first transistor.
3. The circuit of claim 2, wherein the current analog module further comprises a second transistor;
the first end of the second transistor is electrically connected with the second end of the first transistor and the positive electrode of the current module, the second end of the second transistor is electrically connected with the thermal resistance simulation module, and the third end of the second transistor is electrically connected with the second control port; the second control port is used for providing voltage for the third end of the second transistor.
4. The circuit of claim 3, wherein the circuit comprises a plurality of transistors,
the current of the second transistor is the difference between the output current of the second end of the first transistor and the output current of the current module, and the current of the second transistor is used for simulating the filter current.
5. The circuit of claim 1, further comprising a heat capacity simulation module comprising at least a simulated capacitance; the thermal resistance simulation module at least comprises a simulation resistor;
one end of the analog resistor is connected with the current analog module, and the other end of the analog resistor is connected with the analog capacitor; the other end of the analog capacitor is grounded; the analog capacitor is connected with the analog resistor in parallel;
the analog capacitance is used for simulating the heat capacity of the filter.
6. The circuit of claim 3, further comprising an operational amplifier, the operational amplifier comprising a first input, a second input, and an operational amplifier output;
the second end of the third transistor is electrically connected with the first input end of the operational amplifier and the power amplifier respectively, the second input end of the operational amplifier is electrically connected with the second end of the first transistor, and the operational amplifier output end of the operational amplifier is electrically connected with the second control port.
7. The circuit of claim 3, further comprising a fourth transistor, a control transistor, and a first current module;
the first end of the fourth transistor is electrically connected with a power supply;
the second end of the fourth transistor is electrically connected with the first end of the control transistor, the second end of the control transistor is grounded, the third end of the control transistor is connected with a third control port, and the third control port is used for providing voltage for the third end of the control transistor;
a third end of the fourth transistor is electrically connected with the first control port and a third end of the third transistor respectively;
the positive electrode of the first current module is electrically connected with the second end and the third end of the fourth transistor respectively, and the negative electrode of the first current module is grounded.
8. The circuit of claim 7, further comprising a reference voltage analog module and a comparator; the comparator comprises a third input end, a fourth input end and a comparison output end;
the third input end of the comparator is electrically connected with the thermal resistance simulation module, the fourth input end of the comparator is electrically connected with the reference voltage simulation module, and the comparison output end of the comparator is electrically connected with the third control port;
the reference voltage module is used for generating a reference voltage.
9. The circuit of any one of claims 1 to 8, further comprising a divider resistor;
one end of the voltage dividing resistor is electrically connected with the thermal resistance simulation module, the other end of the voltage dividing resistor is grounded, and the voltage dividing resistor is connected with the thermal resistance simulation module in parallel.
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