SU1136130A1 - Bipolar source of reference voltage - Google Patents

Abstract

A BIPOLAR SOURCE OF SUPPORT VOLTAGE, containing an operational amplifier, the inverting input of which through a resistor is connected to its output, a voltage reference divider, whose input is connected to the output of the operational amplifier, and the output to the non-inverting input of the operational amplifier, an inverting amplifier that differentiates a separate amplifier, a separate driver, a separate driver, a non-inverting input of the operational amplifier, an inverting amplifier, a separate driver, a separate driver, a separate drive, a non-inverting input of the operational amplifier, a separate amplifier, a separate reference input, an inverting input voltage. the purpose of ensuring a consistent change in the reference stresses; Research institutes under the action of destabilizing factors, the inverter's turn amplifier is connected to the inverting input of the operational amplifier.

Description

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-Or 1 The invention relates to electrical engineering and can be used to power various devices, for example, analog-digital or digital-signal ones. A bipolar reference voltage source is known, in which the voltage of one polarity is provided with a circuit consisting of a reference zener diode regulating an operational amplifier (OU) with a resistive divider in its feedback circuit and a voltage of the other polarity connected to the output Inverter L The source allows to obtain output voltages, large in magnitude of the voltage of the reference Zener diode, how much the magnitudes of these voltages depend on changes in the power supply voltage, since these changes affect the current of the Zener diode, and hence, the support voltage it sets. For this, the source of the change of the positive reference voltage will be repeated by the negative onopHbiM voltage, since the inverter will have to repeat them, while for the source of the positive reference voltage they will be their own, and for the negative reference voltage - forced As a result, the change of the negative reference voltage there will be variations in the pole piece stresses. The drawback of the circuit is also the inconsistency of the changes in the reference voltages under the action of destabilizing factors. The closest in technical essence to the expected one is a source in which a single voltage is stabilized by a circuit consisting of the first operational amplifier, resistive and reference dividers, whose inputs connected to the output of the operational amplifier, and the outputs, respectively, with the inverting and non-inverting inputs of the operational amplifier, and another voltage connected to the output of the first peratsionnogo inverting amplifier repeater provided on the second operational amplifier 2. By connecting a stabilizer to the output of the operational amplifier, the known source ensures that the reference voltages are independent of variations in the supply voltages, however, the output negative voltage is obtained by inverting its positive output voltage. The purpose of the invention is to provide a consistent, change in heteropolar stresses under the action of destabilizing factors. The goal is achieved by the fact that in a two-pole voltage source containing an operational amplifier, the inverting input of which is connected to its output through a resistor, the reference voltage divider whose input is connected to the output of the operational amplifier, and the output to the non-inverting input of the operational amplifier, inverting amplifier, the input of the inverting amplifier is connected to the inverting input of the operational amplifier. The drawing shows the scheme of the proposed source. The source contains an operational amplifier 1, the output of which through a resistor 2 is connected to Zener diode 3, the latter form a reference divider 4, resistors 5 and 6, together with an operational amplifier 7 and a resistor 8 forming an inverting amplifier, which, when fulfilled,. , defusing symmetrical voltages, the Source provides a repetition of the positive changes in the positive output voltage by the tricky output voltage, since they are related to the inverter h4U., | The connection of the relative output (point 9) of the resistive divider on the resistors 5 and 6 to the inverting run of the OA 7 provides a link for changing the positive bearing voltage from the intrinsic variations of the negative reference voltage. Consider, in the presence of this coupling, the behavior of the voltage U at 3 its own change in Ug (which is derived from the change in the bias voltage of the OU 7). Since U2 is O, then for OA 7, the difference between U.-C. 0, and since CHC. 0 (potential of the non-inverting input of the op-amp 7), then, therefore, inside the resistor 6 there is a weighted zero, offset,

change in voltage

But the voltage on the part of the resistor 6 is relatively weighted zero and is dependent on its own changes Uj, is controlling for OU 1, so it changes the HIT (), and both voltage increments and Uj modulo are the same:

kU ,, j.

For example, an increase in DI causes a decrease in UR, then an increased difference of .0 for an op-amp 1

Ur, ug,

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R ... + R, + R,

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then the magnitude of the change, ie, will be equal to 2 s. Therefore, the total change in the reference stresses

.B whether, -li, li2,

will be equal and the scheme provides a consistent change of the reference for example scientific research institutes. 30 and will increase until it compensates for the voltage and °, changed by the voltage U2. Since the transfer coefficient of the increments uU and LC, the resistor 6 is the same

Claims (1)

A bipolar SOURCE OF REFERENCE VOLTAGE, containing an operational amplifier, the inverting input of which is connected through its output to a resistor, a voltage reference divider, the input of which is connected to the output of the operational amplifier, and the output to a non-inverting input of the operational amplifier, an inverting amplifier, characterized in that, for the purpose of to ensure a coordinated change in the reference voltage> under the influence of destabilizing factors, the input of the inverting amplifier is connected to the inverting input of the operational amplifier.