CN217010820U - Two-way operational amplifier - Google Patents
Two-way operational amplifier Download PDFInfo
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- CN217010820U CN217010820U CN202220029284.7U CN202220029284U CN217010820U CN 217010820 U CN217010820 U CN 217010820U CN 202220029284 U CN202220029284 U CN 202220029284U CN 217010820 U CN217010820 U CN 217010820U
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Abstract
The utility model discloses a two-way operational amplifier which comprises an independent operational amplifier, an output pin Out, a positive end input pin In + and a negative end input pin In-, wherein the positive end input pin In + and the negative end input pin In-are respectively connected with two input ends of the independent operational amplifier, the output pin Out is connected with an output end of the independent operational amplifier, and a plurality of frequency-stable direct current amplification circuits are arranged In the independent operational amplifier to realize frequency compensation and high gain bandwidth. The device consists of two independent high-gain and internal frequency compensation operational amplifiers, can be specially designed for single power supply application, has low power supply current and basically does not change along with the voltage, and the application field comprises a converter, a direct current gain module and all traditional operational amplifier circuits which are easily realized in a single power supply system at present, can be directly supplied with power by a standard 5V power supply in a digital system, and does not need an additional +/-5V power supply.
Description
Technical Field
The utility model relates to the technical field of operational amplifiers, in particular to a double-path operational amplifier.
Background
The operational amplifier is a circuit unit with very high amplification factor, in the actual circuit, usually combines with the feedback network to form a certain function module, it is an amplifier with special coupling circuit and feedback, its output signal can be the result of mathematical operations such as input signal addition, subtraction or differentiation, integration, etc., the operational amplifier can be applied to analog-digital converter, direct current gain module and all traditional operational amplifier circuits, wherein, the analog-digital converter is the important component in the mixed signal system, the compromise advantage among precision, speed and power consumption of the pipelined analog-digital converter makes it obtain extensive application in the high resolution and wireless communication field.
At present, noise of a sampling capacitor circuit, bandwidth of a comparator and load capacitors of all stages all influence the speed of a pipeline analog-to-digital converter, but the most influence on the speed of the pipeline analog-to-digital converter is the bandwidth of an operational amplifier of a sample-and-hold circuit and a margin operational amplifier of each stage, the speed and the precision in an analog-to-digital converter system are mainly determined by the establishment characteristics of the operational amplifier, the bandwidth is required to be high if the establishment speed of an operational amplifier is increased, and the direct current gain is required to be large if the establishment precision of the operational amplifier is increased, so that the utility model provides a double-path operational amplifier with high gain bandwidth.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: to solve the technical problems mentioned in the background art, a two-way operational amplifier is proposed.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the double-path operational amplifier comprises an independent operational amplifier, an output pin Out, a positive terminal input pin In + and a negative terminal input pin In-, wherein the positive terminal input pin In + and the negative terminal input pin In-are respectively connected with two input ends of the independent operational amplifier, the output pin Out is connected with an output end of the independent operational amplifier, and a plurality of frequency-stable direct-current amplification circuits are arranged In the independent operational amplifier to realize frequency compensation and high-gain bandwidth.
As a further description of the above technical solution:
the independent operational amplifier comprises a first independent operational amplifier, the output pin Out comprises a 1-way output pin Out1, the positive-side input pin In + comprises a 1-way positive-side input pin In1+, and the negative-side input pin In-comprises a 1-way negative-side input pin In 1-.
As a further description of the above technical solution:
the independent operational amplifier further comprises an independent operational amplifier II, the output pin Out further comprises a 2-way output pin Out2, the positive terminal input pin In + further comprises a 2-way positive terminal input pin In2+, and the negative terminal input pin In-further comprises a 2-way negative terminal input pin In 2-.
As a further description of the above technical solution:
the power supply also comprises a negative power supply terminal pin Vcc-and a positive power supply terminal pin Vcc +, wherein the positive power supply terminal pin Vcc + and the negative power supply terminal pin Vcc + are respectively connected with the positive electrode and the negative electrode of the power supply to supply power for the double-path operational amplifier.
As a further description of the above technical solution:
when the single-ended power supply is carried out, the positive power supply terminal pin Vcc + is connected with the positive electrode of the power supply, and the negative power supply terminal pin Vcc-is grounded.
As a further description of the above technical solution:
the frequency-stabilized direct-current amplifying circuit is a combined circuit formed by a plurality of triodes.
In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that: the device consists of two independent operational amplifiers with high gain and internal frequency compensation, the special design can be applied to single power supply application, the power supply current is low and basically does not change along with the voltage, the application field comprises a converter, a direct current gain module and all traditional operational amplifier circuits, the circuits can be easily realized in a single power supply system at present, the circuits can be directly supplied with power by a standard 5V power supply in a digital system, an additional +/-5V power supply is not needed, in a linear mode, the input common-mode voltage range comprises grounding, and even if the operation is only carried out from a single power supply voltage, the output voltage can also swing to the grounding.
Drawings
FIG. 1 illustrates a schematic block diagram of a two-way operational amplifier provided in accordance with an embodiment of the present invention;
FIG. 2 illustrates a pin layout diagram of a dual-path operational amplifier provided in accordance with an embodiment of the present invention;
FIG. 3 illustrates a circuit diagram of a unity gain amplifier provided in accordance with an embodiment of the present invention;
FIG. 4 illustrates a noise test circuit provided in accordance with an embodiment of the present invention;
fig. 5 illustrates an exemplary peripheral circuit diagram of a dual-path operational amplifier provided in accordance with an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: the double-path operational amplifier comprises two independent operational amplifiers, an output pin Out, a positive terminal input pin In + and a negative terminal input pin In-, the positive terminal input pin In + and the negative terminal input pin In-are respectively connected with two input ends of the independent operational amplifiers, the output pin Out is connected with the output end of the independent operational amplifier, and the double-path operational amplifier also comprises a negative power terminal pin Vcc-and a positive power terminal pin Vcc +, the positive power terminal pin Vcc + and the negative power terminal pin Vcc-are respectively connected with the positive electrode and the negative electrode of a power supply to supply power to the double-path operational amplifier, when single-ended power supply is carried out, a positive power supply terminal Vcc + is connected with the positive electrode of a power supply, a negative power supply terminal Vcc-is grounded, a plurality of frequency stabilization direct current amplification circuits are built in the independent operational amplifier to realize frequency compensation and high gain bandwidth, and the frequency stabilization direct current amplification circuit is a combined circuit formed by a plurality of triodes;
the device consists of two independent high-gain internal frequency compensation operational amplifiers, is specially designed to be applied to single power supply application, has low power supply current and basically does not change along with the voltage, and the application field comprises a converter, a direct current gain module and all traditional operational amplifier circuits which are easily realized in a single power supply system at present, can be directly supplied with power by a standard 5V power supply in a digital system, does not need an additional +/-5V power supply, and has the advantages that in a linear mode, the input common-mode voltage range comprises grounding, and even if the device is only operated from a single power supply voltage, the output voltage can also swing to the grounding.
Specifically, as shown In fig. 2, the independent operational amplifier includes a first independent operational amplifier, the output pin Out includes a first output pin Out1, the positive-side input pin In + includes a first positive-side input pin In1+, the negative-side input pin In-includes a first negative-side input pin In1-, the first positive-side input pin In1+ and the first negative-side input pin In 1-are respectively connected to the positive and negative input terminals of the first independent operational amplifier, and the first output pin Out1 is connected to the output terminal of the first independent operational amplifier.
Specifically, as shown In fig. 2, the independent operational amplifier further includes a second independent operational amplifier, the output pin Out further includes 2 output pins Out2, the positive-end input pin In + further includes 2 positive-end input pins In2+, the negative-end input pin In-further includes 2 negative-end input pins In2-, the 2 positive-end input pins In2+ and the 2 negative-end input pins In 2-are respectively connected to the positive and negative input ends of the second independent operational amplifier, and the 2 output pins Out2 is connected to the output end of the second independent operational amplifier.
Specifically, as shown in fig. 5, a typical peripheral application circuit diagram of the device is shown, wherein, (1) a component R isFClose to the devices and to each other to reduce parasitic errors; (2) supply lines GND, R connected to the 1-way positive side input pin In1+ and the 1-way negative side input pin In1-GAnd signal lines VIN, RINAnd the signal line should be located as far away from the device as possible; (3) when single voltage is used for supplying power, Vcc-is grounded, and when double voltage is used for supplying power, Vcc-is grounded after being connected with a capacitor; (4) vcc + requires grounding after the use of a low ESR ceramic bypass capacitor.
According to the parameter measurement schematic diagrams of fig. 3 and 4, and at Vcc + 5V, GND 0, TAThe electrical characteristics of the device obtained at 25 ℃ are shown in table 1 below:
TABLE 1
Wherein, at the input offset voltage VioWhen, Vo＝1.4V,Rs＝0Ω，5V＜Vcc+＜30V，0＜Vio＜Vcc+-1.5V，Tmin＝-55℃，TmaxThe temperature is 125 ℃; at the input of a bias current IibWhen the direction of the input current is not within the integrated circuit, this current is substantially constant, regardless of the state of the output, so that the load on the input line does not change; in the channel isolation Vo1/Vo2The spacing between external devices should be controlled to ensure that parasitic capacitances between these external components do not cause coupling, which is typically detectable, since the capacitance of this type of capacitance that causes coupling increases with frequency.
When the device is used, (1) the power supply voltage is selected to be larger than the input voltage range and the output range, for example, when a signal of +/-0.5V is scaled to +/-1.8V, the power supply is required to be set to +/-1.2V; (2) using formula Av＝Vout/VinAnd AvThe required gain of the inverting amplifier is determined at 1.8/-0.5/-3.6, and after determining the required gain, R isIAnd RFSelecting a value, in the kilo-ohm range, is desirable because the amplifier uses a current in the milli-amp range, which ensures that the part does not draw too much current, and this embodiment uses 10k Ω for RIThen by formula Av＝-RF/RICan obtain RFIs 36k omega; (3) power supply recommendationValues above the supply voltage specified in the recommended operating region may permanently damage the device (see absolute maximum rating), placing a 0.1 muF bypass capacitor near the supply pins to reduce noise or errors in high impedance power coupling.
The operating conditions, absolute maximum rating and electrostatic discharge rating of the device are given in tables 2-4 below:
TABLE 2
| (symbol) | Parameter(s) | Minimum value of | Maximum value | Unit |
| Vcc | Supply voltage | 3 | 32 | V |
| VCM | Common mode voltage | Vcc- | Vcc+-2 | V |
| TA | Temperature of working environment | -55 | 125 | ℃ |
TABLE 3
TABLE 4
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (6)
1. The double-path operational amplifier is characterized by comprising an independent operational amplifier, an output pin Out, a positive terminal input pin In + and a negative terminal input pin In-, wherein the positive terminal input pin In + and the negative terminal input pin In-are respectively connected with two input ends of the independent operational amplifier, the output pin Out is connected with an output end of the independent operational amplifier, and a plurality of frequency-stabilized direct-current amplification circuits are arranged In the independent operational amplifier to realize frequency compensation and high-gain bandwidth.
2. The two-way operational amplifier of claim 1, wherein the independent operational amplifier comprises a first independent operational amplifier, the output pin Out comprises a 1-way output pin Out1, the positive side input pin In + comprises a 1-way positive side input pin In1+, and the negative side input pin In-comprises a 1-way negative side input pin In 1-.
3. The dual path operational amplifier of claim 2, wherein the independent operational amplifier further comprises a second independent operational amplifier, the output pin Out further comprises a 2-way output pin Out2, the positive side input pin In + further comprises a 2-way positive side input pin In2+, the negative side input pin In-further comprises a 2-way negative side input pin In 2-.
4. The dual-path operational amplifier of claim 1, further comprising a negative power terminal pin Vcc "and a positive power terminal pin Vcc +, the positive power terminal pin Vcc + and the negative power terminal pin Vcc" being connected to a positive and negative terminal of a power supply, respectively, for powering the dual-path operational amplifier.
5. The dual-channel operational amplifier of claim 4, wherein the positive power supply terminal Vcc + is connected to the positive terminal of the power supply and the negative power supply terminal Vcc-is grounded when single-ended powered.
6. The dual-channel operational amplifier according to claim 1, wherein the frequency-stabilized dc amplifying circuit is a combination circuit of a plurality of transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220029284.7U CN217010820U (en) | 2022-01-06 | 2022-01-06 | Two-way operational amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220029284.7U CN217010820U (en) | 2022-01-06 | 2022-01-06 | Two-way operational amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN217010820U true CN217010820U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220029284.7U Active CN217010820U (en) | 2022-01-06 | 2022-01-06 | Two-way operational amplifier |
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|---|---|
| CN (1) | CN217010820U (en) |
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