TW202005268A - Operational amplifier device with improved output voltage response including a signal adjustment unit and an operational amplifier unit - Google Patents

Abstract

An operational amplifier device includes a signal adjustment unit and an operational amplifier unit. The signal adjustment unit is used for receiving an input voltage, amplifying the input voltage and performing phase compensating to generate an adjustment voltage. The operational amplifier unit is electrically connected to the signal adjustment unit to receive the adjustment voltage, and amplifies the adjustment voltage to generate an output voltage.

Description

Operational amplification device with improved output voltage response

The invention relates to an operational amplifier device, in particular to an operational amplifier device with improved output voltage response.

Referring to FIG. 1, the conventional operational amplifier 1 is used to amplify an input voltage vi to generate an output voltage vo. However, the output voltage vo is affected by a time constant τ of a resistor 11 and a capacitor 12, and a voltage value of the output voltage vo will reach a stable voltage value after a delay time.

For example, when a resistance value of each of the resistors 11 and 13 is 10 k ohms and a capacitance value of the capacitor 12 is 0.01 u farad, the simulation result obtained by the operational amplifier 1 is shown in FIG. 2. It can be seen from FIG. 2 that when the input voltage vi rises from 0V to 5V, the output voltage vo will delay about 500us before rising from 0V to 5V (that is, the delay time is about 500us, and the stable voltage value is 5V) . Therefore, how to design an operational amplifying device that can shorten the delay time to increase the response of the output voltage vo is one of the goals of the related industry.

Therefore, the object of the present invention is to provide an operational amplifier device that can improve the output voltage response.

Therefore, the operational amplification device of the present invention includes a signal adjustment unit and an operational amplification unit.

The signal adjustment unit is used for receiving an input voltage, amplifying the input voltage and phase compensation to generate an adjustment voltage.

The operational amplifier unit is electrically connected to the signal adjustment unit to receive the adjustment voltage, and amplifies the adjustment voltage to generate an output voltage.

The effect of the present invention is that the input voltage is amplified and phase-compensated by the signal adjustment unit, and then the response of the output voltage of the operational amplifier is improved.

Referring to FIG. 3, an embodiment of the operational amplifier device of the present invention includes a signal adjustment unit 2 and an operational amplifier unit 3.

The signal adjustment unit 2 is used to receive an input voltage Vi, and amplify the input voltage Vi and phase compensate to generate an adjustment voltage Vd. In this embodiment, the signal adjustment unit 2 includes a gain amplifier circuit 21 and a phase lead compensation circuit 22.

The gain amplifier circuit 21 is used to receive the input voltage Vi and amplify the input voltage Vi to generate an amplified voltage Va. In this embodiment, the gain amplifying circuit 21 includes an operational amplifier 211, and first and second input resistors 212 and 213.

The operational amplifier 211 has a non-inverting input terminal for receiving the input voltage Vi, an inverting input terminal, and an output terminal for outputting the amplified voltage Va. The first input resistor 212 is electrically connected between the inverting input terminal of the operational amplifier 211 and ground. The second input resistor 213 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier 211.

The phase lead compensation circuit 22 is electrically connected to the output terminal of the operational amplifier 211 of the gain amplifier circuit 21 to receive the amplified voltage Va, and advances a phase of the amplified voltage Va to generate the adjusted voltage Vd. In this embodiment, the phase lead compensation circuit 22 includes first and second resistors 221 and 222, and a capacitor 223.

The first resistor 221 has a first terminal electrically connected to the output terminal of the operational amplifier 211 to receive the amplified voltage Va, and a second terminal. The second resistor 222 is electrically connected between the second end of the first resistor 221 and ground, and a voltage across the second resistor 222 is used as the adjustment voltage Vd. The capacitor 223 is electrically connected between the first and second ends of the first resistor 221.

The operational amplifier unit 3 is electrically connected to the second end of the first resistor 221 of the signal adjustment unit 2 to receive the adjustment voltage Vd, and amplifies the adjustment voltage Vd to generate an output voltage Vo. In this embodiment, the operational amplifier unit 3 includes an operational amplifier 31, first and second resistors 32, 33, and a capacitor 34.

The operational amplifier 31 has a non-inverting input terminal electrically connected to the second terminal of the first resistor 221 to receive the adjustment voltage Vd, an inverting input terminal, and an output terminal. The first resistor 32 is electrically connected between the inverting input terminal and the output terminal of the operational amplifier 31. The second resistor 33 is electrically connected between the inverting input terminal of the operational amplifier 31 and ground. The capacitor 34 is connected in parallel to the first resistor 32, and a voltage across the capacitor 34 is used as the output voltage Vo.

Referring to FIG. 4, it is a resistance value of the first input resistor 212, the first resistors 32, 221, and the second resistor 33 each being 10k ohm, and a resistance value of the second input resistor 213 Is 20k ohm, a resistance value of the second resistor 222 is 5k ohm, and a capacitance value of each of the capacitors 223, 34 is 0.01u farad, the input voltage Vi and the output voltage Vo of the embodiment are each paired Changes in time. It can be seen from FIG. 4 that when the input voltage Vi rises from 0V to 5V, the output voltage Vo rises from 0V to 5V with a delay of only about 200us, which is increased from 0V compared to an input voltage vi in FIG. 2. When it reaches 5V, the corresponding output voltage vo will delay about 500us before it rises to 5V. The operational amplifier of this embodiment can really shorten the delay time of the output voltage Vo reaching a stable voltage value (ie, 5V) (Short from about 500us to about 200us), and then to achieve the effect of improving the output voltage Vo response.

In summary, the signal adjustment unit 2 amplifies and phase-compensates the input voltage Vi, so that the delay time required when the output voltage Vo reaches the stable voltage value can be shortened. The purpose of the output voltage Vo response of the operational amplifier of the embodiment.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

2‧‧‧Signal adjustment unit 21‧‧‧Gain amplifier circuit 211‧‧‧Operation amplifier 212‧‧‧First input resistor 213‧‧‧Second input resistor 22‧‧‧‧Phase lead compensation circuit 221‧‧‧ First resistor 222‧‧‧ Second resistor 223‧‧‧Capacitor 3‧‧‧Operation amplifier unit 31‧‧‧Operation amplifier 32‧‧‧ First resistor 33‧‧‧Second resistor 34‧‧‧ Capacitor Va‧‧‧amplified voltage Vd‧‧‧adjusted voltage Vi‧‧‧input voltage Vo‧‧‧output voltage

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a circuit diagram illustrating a conventional operation amplification device; FIG. 2 is a simulation diagram illustrating the conventional operation amplification The changes of an input voltage and an output voltage of the device with respect to time respectively; FIG. 3 is a circuit diagram illustrating an embodiment of the operational amplifier device of the present invention; and FIG. 4 is a simulation diagram illustrating an input voltage and an embodiment of the embodiment The output voltage varies with time.

2‧‧‧Signal adjustment unit

21‧‧‧Gain amplifier circuit

211‧‧‧Operational amplifier

212‧‧‧First input resistor

213‧‧‧ Second input resistor

22‧‧‧Phase lead compensation circuit

221‧‧‧ First resistor

222‧‧‧Second resistor

223‧‧‧Capacitor

3‧‧‧Amplification unit

31‧‧‧Operational amplifier

32‧‧‧First resistor

33‧‧‧Second resistor

34‧‧‧Capacitor

Va‧‧‧amplified voltage

Vd‧‧‧adjust voltage

Vi‧‧‧Input voltage

Vo‧‧‧ output voltage

Claims (6)

An operational amplifier device includes: a signal adjustment unit for receiving an input voltage, and amplifying the input voltage and phase compensation to generate an adjustment voltage; and an operational amplification unit electrically connected to the signal adjustment unit to receive the Adjust the voltage and amplify the adjusted voltage to generate an output voltage. The operational amplifier device according to claim 1, wherein the signal adjustment unit includes a gain amplifier circuit for receiving the input voltage and amplifying the input voltage to generate an amplified voltage, and a phase lead compensation circuit The gain amplifier circuit is connected to receive the amplified voltage and advance a phase of the amplified voltage to generate the adjusted voltage. The operational amplifier device according to claim 2, wherein the gain amplification circuit includes an operational amplifier having a non-inverting input terminal for receiving the input voltage, an inverting input terminal, and an output terminal for outputting the amplified voltage The output terminal, a first input resistor, is electrically connected between the inverting input terminal of the operational amplifier and ground, and a second input resistor is electrically connected between the inverting input terminal and the output terminal of the operational amplifier between. The operational amplifier device according to claim 2, wherein the phase advance compensation circuit includes a first resistor having a first terminal electrically connected to the gain amplifier circuit to receive the amplified voltage, and a second terminal, a A second resistor is electrically connected between the second end of the first resistor and ground, and a voltage across the second resistor is used as the adjustment voltage, and a capacitor is electrically connected to the first resistor Between these first and second ends. The operational amplifier device according to claim 4, wherein the gain amplification circuit includes an operational amplifier having a non-inverting input terminal for receiving the input voltage, an inverting input terminal, and an electrical connection to the first The first terminal of the resistor and the output terminal that outputs the amplified voltage, a first input resistor electrically connected between the inverting input terminal of the operational amplifier and ground, and a second input resistor electrically connected at Between the inverting input terminal and the output terminal of the operational amplifier. The operational amplifier device according to claim 1, wherein the operational amplifier unit includes an operational amplifier having a non-inverting input terminal electrically connected to the signal adjustment unit and receiving the adjustment voltage from the signal adjustment unit A phase input terminal, and an output terminal, a first resistor electrically connected between the inverting input terminal and the output terminal of the operational amplifier, a second resistor electrically connected to the inverting input of the operational amplifier Between the terminal and ground, and a capacitor, the first resistor is connected in parallel, and a voltage across the capacitor is used as the output voltage.

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