Positive-and-negative-voltage-reference-tracker
#op amp
#voltage reference
#negative voltage
#positive voltage
#tracking circuit
#voltage regulator
#analog circuit
#precision circuit
Description: This reference utilizes an operational amplifier (op amp) to generate a negative output voltage that corresponds with the positive reference voltage. A pA747 dual op amp, or any similar device such as an LM1458 or two 1-A741 devices, can be employed.
The circuit described operates by leveraging the characteristics of operational amplifiers to create a negative voltage output that mirrors a positive reference voltage. The configuration typically involves connecting the op amp in an inverting configuration, where the reference voltage is applied to the non-inverting input. The inverting input is connected to a feedback network that dictates the gain of the op amp and thus regulates the output voltage.
In this setup, the pA747 dual op amp is particularly suitable due to its dual-channel capability, allowing for simultaneous processing of signals. The LM1458 is another viable option, offering similar performance with a slightly different pin configuration. Alternatively, two 1-A741 op amps can be utilized in tandem to achieve the desired functionality.
The circuit can be designed to provide a negative output voltage that is proportional to the positive reference voltage supplied. This proportionality is achieved by selecting appropriate resistor values in the feedback loop, which set the gain of the op amp. The output voltage (Vout) can be expressed mathematically as Vout = - (R2/R1) * Vref, where R1 is the resistor connected to the inverting input and R2 is the feedback resistor connected from the output to the inverting input.
This design is beneficial in applications where a negative voltage is required for biasing or signal processing, and it ensures that the output remains stable and tracks variations in the reference voltage accurately. Proper decoupling capacitors should also be included near the power supply pins of the op amp to minimize noise and enhance performance.This reference uses an op amp to derive a negative output voltage that tracks with the positive reference voltage. A pA747 dual op amp, or any similar device such as an LM1458 or two 1-"A741 devices, can be used.
The circuit described operates by leveraging the characteristics of operational amplifiers to create a negative voltage output that mirrors a positive reference voltage. The configuration typically involves connecting the op amp in an inverting configuration, where the reference voltage is applied to the non-inverting input. The inverting input is connected to a feedback network that dictates the gain of the op amp and thus regulates the output voltage.
In this setup, the pA747 dual op amp is particularly suitable due to its dual-channel capability, allowing for simultaneous processing of signals. The LM1458 is another viable option, offering similar performance with a slightly different pin configuration. Alternatively, two 1-A741 op amps can be utilized in tandem to achieve the desired functionality.
The circuit can be designed to provide a negative output voltage that is proportional to the positive reference voltage supplied. This proportionality is achieved by selecting appropriate resistor values in the feedback loop, which set the gain of the op amp. The output voltage (Vout) can be expressed mathematically as Vout = - (R2/R1) * Vref, where R1 is the resistor connected to the inverting input and R2 is the feedback resistor connected from the output to the inverting input.
This design is beneficial in applications where a negative voltage is required for biasing or signal processing, and it ensures that the output remains stable and tracks variations in the reference voltage accurately. Proper decoupling capacitors should also be included near the power supply pins of the op amp to minimize noise and enhance performance.This reference uses an op amp to derive a negative output voltage that tracks with the positive reference voltage. A pA747 dual op amp, or any similar device such as an LM1458 or two 1-"A741 devices, can be used.
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