CN116388704A - Program-controlled gain transimpedance amplifier and method - Google Patents
Program-controlled gain transimpedance amplifier and method Download PDFInfo
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- CN116388704A CN116388704A CN202310345713.0A CN202310345713A CN116388704A CN 116388704 A CN116388704 A CN 116388704A CN 202310345713 A CN202310345713 A CN 202310345713A CN 116388704 A CN116388704 A CN 116388704A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 9
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/38—Positive-feedback circuit arrangements without negative feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the technical field of single chip microcomputer, and provides a program control gain transimpedance amplifier, which comprises: the amplifying module is used for receiving the voltage signal at the input end and outputting the amplified voltage signal to control the gain of the circuit; and the control module is connected with the amplifying module and is used for converting the current signal into a voltage signal by closing a switch of the control module after the input end receives the current signal, so as to form a transimpedance amplifier with program-controlled gain to control the circuit gain. The PGA circuit can amplify the voltage signal and simultaneously provide the capability of converting current into voltage, and the application range of the PGA circuit is expanded.
Description
Technical Field
The invention relates to the technical field of single-chip microcomputer, in particular to a program-controlled gain transimpedance amplifier and a method.
Background
Among operational amplifier products, programmable gain amplifiers (Programmable Gain Amplifier, PGA) have found wide application. Typical PGA circuits have a bias voltage that is selected to be grounded or other fixed voltage as desired, depending on the actual requirements. In practice, PGA circuits are typically used to amplify voltage signals.
How to expand the application range of PGA circuits while providing the capability of current to voltage is a problem to be solved.
Disclosure of Invention
The invention aims to provide a program-controlled gain transimpedance amplifier which can solve the problems.
The technical scheme provided by the invention is as follows:
in some embodiments, the present invention provides a programmable gain transimpedance amplifier comprising:
the amplifying module is used for receiving the voltage signal at the input end and outputting the amplified voltage signal to control the gain of the circuit;
and the control module is connected with the amplifying module and is used for converting the current signal into a voltage signal by closing a switch of the control module after the input end receives the current signal, so as to form a transimpedance amplifier with program-controlled gain to control the circuit gain.
In some embodiments, further comprising:
and the programming input module is connected with the control module and is used for outputting programming signals so as to control the on and off of a switch in the control module.
In some embodiments, the amplification module comprises: an amplifier, a first resistor;
the non-inverting terminal of the amplifier is connected with the input terminal of the bias voltage signal;
the inverting terminal of the amplifier and the output terminal of the amplifier are connected with the first resistor.
In some embodiments, the control module includes: a second resistor, a switch;
the second resistor is connected with the switch in parallel;
the second resistor is also connected with the first resistor;
the second resistor is also connected with the inverting terminal of the amplifier.
In some embodiments:
and when the switch is opened, receiving the voltage signal of the input end and amplifying the voltage signal for output.
In some embodiments:
when the switch is closed, a current signal of the input terminal is received and converted into the voltage signal.
In some embodiments, the first resistor is an adjustable resistor.
In some embodiments, the present invention provides a program-controlled gain transimpedance amplifier, which is applied to the program-controlled gain transimpedance amplifier, and comprises:
receiving the voltage signal at the input end and outputting the amplified voltage signal to control the circuit gain;
after the input end receives the current signal, the current signal is converted into a voltage signal by closing a switch of the control module, so that a transimpedance amplifier with program-controlled gain is formed to control the circuit gain.
In some embodiments, the method comprises:
and when the switch in the program-controlled gain transimpedance amplifier is turned off, receiving the voltage signal of the input end and amplifying the voltage signal for output.
In some embodiments, the method comprises:
when the switch in the program controlled gain transimpedance amplifier is closed, the current signal of the input end is received and converted into the voltage signal.
The program-controlled gain transimpedance amplifier and the method provided by the invention have the following beneficial effects:
the invention realizes the PGA amplifying voltage signal and simultaneously provides the capability of current to voltage, and expands the application range of the PGA circuit.
Drawings
The foregoing features, technical features, advantages and implementation of a programmable gain transimpedance amplifier will be further described in a clear and understandable manner by describing preferred embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a first embodiment of a programmable gain transimpedance amplifier of the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a programmable gain transimpedance amplifier of the present invention;
FIG. 3 is a schematic diagram of a state change of a programmable gain transimpedance amplifier according to the present invention;
FIG. 4 is a schematic diagram of a state change of a programmable gain transimpedance amplifier according to the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain the specific embodiments of the present invention with reference to the accompanying drawings. It is evident that the drawings in the following description are only examples of the invention, from which other drawings and other embodiments can be obtained by a person skilled in the art without inventive effort.
For the sake of simplicity of the drawing, the parts relevant to the present invention are shown only schematically in the figures, which do not represent the actual structure thereof as a product. Additionally, in order to simplify the drawing for ease of understanding, components having the same structure or function in some of the drawings are shown schematically with only one of them, or only one of them is labeled. Herein, "a" means not only "only this one" but also "more than one" case.
In one embodiment, as shown in FIG. 1, the present invention provides a programmable gain transimpedance amplifier comprising:
the amplifying module 100 is configured to receive the voltage signal at an input terminal and output the amplified voltage signal to control a circuit gain.
And the control module 200 is connected with the amplifying module and is used for converting the current signal into a voltage signal by closing a switch of the control module after the current signal is received by the input end, so as to form a transimpedance amplifier with program-controlled gain to control the circuit gain.
In this embodiment, the PGA amplifying voltage signal is realized by the present invention, and the capability of providing the current to the voltage is provided at the same time, so as to expand the application range of the PGA circuit.
In one embodiment, further comprising:
and the programming input module is connected with the control module and is used for outputting programming signals so as to control the on and off of a switch in the control module.
In this embodiment, two ends of a resistor R2 in the circuit shown in fig. 4 are connected in parallel to a switch SW to form the circuit shown in fig. 2; the opening or closing of the switch can also be programmed.
Illustratively, the switch may be controlled in the MCU in the form of a register, with a register writing 0 then the switch open and a register writing 1 then the switch closed.
In addition, if a discrete programmable amplifier is used, external pin control, or common interface such as SPI/I2C and the like can be used for matching register control.
Wherein, the switch is closed and opened by programming control, and whether the switch is opened or closed is determined by a user. The switch SW may be the most common switching device.
In one embodiment, the amplifying module includes: an amplifier, a first resistor;
the non-inverting terminal of the amplifier is connected with the input terminal of the bias voltage signal;
the inverting terminal of the amplifier and the output terminal of the amplifier are connected with the first resistor.
In this embodiment, as shown in fig. 2, the bias voltage is input to the non-inverting terminal of the amplifier, and the inverting terminal of the amplifier and the output terminal of the amplifier are connected to the first resistor R1 to form an amplifying module.
In one embodiment, the control module includes: a second resistor, a switch;
the second resistor is connected with the switch in parallel;
the second resistor is also connected with the first resistor;
the second resistor is also connected with the inverting terminal of the amplifier.
In this embodiment, as shown in fig. 2, the second resistor R2 is connected in parallel with the switch SW, the second resistor is further connected with the first resistor R1, the second resistor is further connected with the inverting terminal of the amplifier, the first terminal of the second resistor R2 is connected with the input signal, and the input signal is a current signal.
In one embodiment:
and when the switch is opened, receiving the voltage signal of the input end and amplifying the voltage signal for output.
In this embodiment, when the switch is turned off, the circuit is equivalent to the circuit of fig. 3, and the voltage signal can be accessed to the input terminal for normal voltage amplification.
Illustratively, when the switch SW in fig. 2 is turned off, the circuit of the present embodiment corresponds to a typical PGA circuit as shown in fig. 3. Among operational amplifier products, programmable gain amplifiers (Programmable Gain Amplifier, PGA) have found wide application.
The basic form of a Programmable gain amplifier (Programmable GainAmplifier, PGA) consists of an operational amplifier and an analog switch controlled resistor network. The analog switch is controlled by digital codes. The digital code can be realized by digital hardware circuit or can be controlled by computer hardware according to the need.
The bias voltage can be grounded or other fixed potential according to the actual requirement.
This circuit is generally applied to the amplification of a voltage signal, the gain of which is:
A＝V o /V i ＝-R1/R2。
wherein A is the circuit gain, V o To output signal (voltage signal), V i For the input signal (voltage signal), R1 is the resistance value of the first resistor, and R2 is the resistance value of the second resistor.
In this embodiment, the resistance value of the resistor R1 is changed by programming to realize control of the circuit gain.
In one embodiment:
when the switch is closed, a current signal of the input terminal is received and converted into the voltage signal.
In this embodiment, when the switch is turned on, the circuit can be equivalent to the circuit of fig. 4, and the input terminal is connected to the current signal to realize the current-to-voltage, i.e. the transimpedance amplifier with program-controlled gain. I.e. the PGA after switching is added, can be used as the programming gain TIA.
The TIA is known as Transimpedance amplifier, a transimpedance amplifier. Firstly, the amplifier is better understood from the literal understanding that the amplifier is, for example, amplifying a voltage.
Illustratively, when the switch SW in fig. 2 is closed, the circuit corresponds to another application of an operational amplifier, and this circuit is also called a transimpedance amplifier (Trans-Impedance Amplifier, TIA) which is capable of converting a current signal into a voltage signal with a circuit gain of:
A＝V o / I i＝R1。
wherein A is the circuit gain, V o To output signal (voltage signal), I i As an input signal (current signal), R1 is a resistance value of the first resistor.
In this embodiment, in practical application, the TIA circuit also has a program controlled gain requirement, and on the other hand, the circuit in this embodiment can be used to amplify a voltage signal, and simultaneously provide the capability of current to voltage, which can also expand the application range of the PGA circuit.
In this embodiment, the circuit of this design may support two different applications. Such as MCU, with such designed amplifier, can be applied in different markets.
In one embodiment, the first resistor is an adjustable resistor.
In this embodiment, as shown in fig. 2, the first resistor R1 is an adjustable resistor, and a programming command is input through a programming input module to change the resistance value of the first resistor, so as to control the gain of the circuit in this embodiment.
In one embodiment, the invention provides a program-controlled gain transimpedance amplifier, which is applied to the program-controlled gain transimpedance amplifier and comprises:
receiving the voltage signal at the input end and outputting the amplified voltage signal to control the circuit gain;
after the input end receives the current signal, the current signal is converted into a voltage signal by closing a switch of the control module, so that a transimpedance amplifier with program-controlled gain is formed to control the circuit gain.
In this embodiment, the PGA amplifying voltage signal is realized by the present invention, and the capability of providing the current to the voltage is provided at the same time, so as to expand the application range of the PGA circuit.
In one embodiment, the method comprises:
and when the switch in the program-controlled gain transimpedance amplifier is turned off, receiving the voltage signal of the input end and amplifying the voltage signal for output.
In this embodiment, two ends of a resistor R2 in the circuit shown in fig. 4 are connected in parallel to a switch SW to form the circuit shown in fig. 2; the opening or closing of the switch can also be programmed.
Illustratively, the switch may be controlled in the MCU in the form of a register, with a register writing 0 then the switch open and a register writing 1 then the switch closed.
In addition, if a discrete programmable amplifier is used, external pin control, or common interface such as SPI/I2C and the like can be used for matching register control.
Wherein, the switch is closed and opened by programming control, and whether the switch is opened or closed is determined by a user. The switch SW may be the most common switching device.
In this embodiment, when the switch is turned off, the circuit is equivalent to the circuit of fig. 3, and the voltage signal can be accessed to the input terminal for normal voltage amplification.
Illustratively, when the switch SW in fig. 2 is turned off, the circuit of the present embodiment corresponds to a typical PGA circuit as shown in fig. 3. Among operational amplifier products, programmable gain amplifiers (Programmable Gain Amplifier, PGA) have found wide application.
The basic form of a Programmable gain amplifier (Programmable GainAmplifier, PGA) consists of an operational amplifier and an analog switch controlled resistor network. The analog switch is controlled by digital codes. The digital code can be realized by digital hardware circuit or can be controlled by computer hardware according to the need.
The bias voltage can be grounded or other fixed potential according to the actual requirement.
This circuit is generally applied to the amplification of a voltage signal, the gain of which is:
A＝V o /V i ＝-R1/R2。
in this embodiment, the resistance value of the resistor R1 is changed by programming to realize control of the circuit gain.
In one embodiment, the method comprises:
when the switch in the program controlled gain transimpedance amplifier is closed, the current signal of the input end is received and converted into the voltage signal.
In this embodiment, when the switch is turned on, the circuit can be equivalent to the circuit of fig. 4, and the input terminal is connected to the current signal to realize the current-to-voltage, i.e. the transimpedance amplifier with program-controlled gain. I.e. the PGA after switching is added, can be used as the programming gain TIA.
The TIA is known as Transimpedance amplifier, a transimpedance amplifier. Firstly, the amplifier is better understood from the literal understanding that the amplifier is, for example, amplifying a voltage.
Illustratively, when the switch SW in fig. 2 is closed, the circuit corresponds to another application of an operational amplifier, and this circuit is also called a transimpedance amplifier (Trans-Impedance Amplifier, TIA) which is capable of converting a current signal into a voltage signal with a circuit gain of:
A＝V o /I i ＝R1。
in this embodiment, in practical application, the TIA circuit also has a program controlled gain requirement, and on the other hand, the circuit in this embodiment can be used to amplify a voltage signal, and simultaneously provide the capability of current to voltage, which can also expand the application range of the PGA circuit.
In this embodiment, the circuit of this design may support two different applications. Such as MCU, with such designed amplifier, can be applied in different markets.
In this embodiment, the PGA amplifying voltage signal can be realized by the present invention, and the capability of providing the current to the voltage is provided, so as to expand the application range of the PGA circuit.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the parts of a certain embodiment that are not described or depicted in detail may be referred to in the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed system may be implemented in other manners. The above described embodiments are exemplary only, and exemplary, the division of the modules or units is merely a logical function division, and there may be additional divisions when actually implemented, exemplary, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
It should be noted that the above embodiments can be freely combined as needed. The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A programmable gain transimpedance amplifier comprising:
the amplifying module is used for receiving the voltage signal at the input end and outputting the amplified voltage signal to control the gain of the circuit;
and the control module is connected with the amplifying module and is used for converting the current signal into a voltage signal by closing a switch of the control module after the input end receives the current signal, so as to form a transimpedance amplifier with program-controlled gain to control the circuit gain.
2. The programmable gain transimpedance amplifier according to claim 1, further comprising:
and the programming input module is connected with the control module and is used for outputting programming signals so as to control the on and off of a switch in the control module.
3. The programmable gain transimpedance amplifier according to claim 1, wherein the amplification module comprises: an amplifier, a first resistor;
the non-inverting terminal of the amplifier is connected with the input terminal of the bias voltage signal;
the inverting terminal of the amplifier and the output terminal of the amplifier are connected with the first resistor.
4. A programmable gain transimpedance amplifier according to claim 3, wherein the control module comprises: a second resistor, a switch;
the second resistor is connected with the switch in parallel;
the second resistor is also connected with the first resistor;
the second resistor is also connected with the inverting terminal of the amplifier.
5. The programmable gain transimpedance amplifier according to claim 4, wherein:
and when the switch is opened, receiving the voltage signal of the input end and amplifying the voltage signal for output.
6. The programmable gain transimpedance amplifier according to claim 5, wherein:
when the switch is closed, a current signal of the input terminal is received and converted into the voltage signal.
7. The programmable gain transimpedance amplifier according to claim 6, wherein the first resistor is an adjustable resistor.
8. A method of programmable gain transimpedance amplification applied to a programmable gain transimpedance amplifier according to any of claims 1 to 7, comprising:
receiving the voltage signal at the input end and outputting the amplified voltage signal to control the circuit gain;
after the input end receives the current signal, the current signal is converted into a voltage signal by closing a switch of the control module, so that a transimpedance amplifier with program-controlled gain is formed to control the circuit gain.
9. The method of programmable gain transimpedance amplification according to claim 8, comprising:
and when the switch in the program-controlled gain transimpedance amplifier is turned off, receiving the voltage signal of the input end and amplifying the voltage signal for output.
10. The method of programmable gain transimpedance amplification according to claim 8, comprising:
when the switch in the program controlled gain transimpedance amplifier is closed, the current signal of the input end is received and converted into the voltage signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310345713.0A CN116388704A (en) | 2023-04-03 | 2023-04-03 | Program-controlled gain transimpedance amplifier and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310345713.0A CN116388704A (en) | 2023-04-03 | 2023-04-03 | Program-controlled gain transimpedance amplifier and method |
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| CN116388704A true CN116388704A (en) | 2023-07-04 |
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| CN202310345713.0A Pending CN116388704A (en) | 2023-04-03 | 2023-04-03 | Program-controlled gain transimpedance amplifier and method |
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