Reference Voltage Circuit for Precision Temperature Control
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Summary
Problems
Existing bandgap reference voltage circuits face challenges in adjusting output voltage while maintaining desired temperature characteristics, and struggle to generate voltages equal to or lower than the forward voltage of bipolar transistors.
Innovation solutions
A reference voltage circuit is designed with a reference current generating circuit, a current generating circuit, and a voltage generating circuit using resistive elements to produce a reference voltage with arbitrary temperature characteristics by combining currents and voltages generated from PN junction elements, allowing for adjustment of output voltage.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If resistor 608 is adjusted for adjusting the value of the output voltage, then the output voltage value is improved, but the temperature characteristics of the output voltage deteriorate
Why choose this principle:
The voltage generating circuit is divided into two separate branches: a first branch with a first resistive element generating a first voltage with positive temperature characteristics, and a second branch with a second resistive element generating a second voltage with negative temperature characteristics. This segmentation allows independent adjustment of each branch's resistance values to achieve both desired output voltage value and temperature characteristics simultaneously.
Principle concept:
If resistor 608 is adjusted for adjusting the value of the output voltage, then the output voltage value is improved, but the temperature characteristics of the output voltage deteriorate
Why choose this principle:
The invention changes the parameters of the resistive elements by providing multiple resistive elements with different resistance values in parallel configurations. By selecting and combining resistive elements with specific resistance values, the circuit can generate voltages with both positive and negative temperature characteristics, enabling independent control of output voltage value and temperature characteristics.
Application Domain
Data Source
AI summary:
A reference voltage circuit is designed with a reference current generating circuit, a current generating circuit, and a voltage generating circuit using resistive elements to produce a reference voltage with arbitrary temperature characteristics by combining currents and voltages generated from PN junction elements, allowing for adjustment of output voltage.
Abstract
Provided is a reference voltage circuit capable of adjusting an arbitrary output voltage to have arbitrary temperature characteristics. The reference voltage circuit includes: a reference current generating circuit configured to convert a difference between forward voltages of a plurality of PN junction elements into current to generate a first current; a current generating circuit configured to use the first current generated by the reference current generating circuit to generate a second current; and a voltage generating circuit including a first resistive element and a second resistive element, the first resistive element being configured to generate a first voltage having positive temperature characteristics when the first current flows through the first resistive element, the second resistive element being configured to generate a second voltage having negative temperature characteristics when the first current and the second current flow through the second resistive element. The reference voltage circuit outputs a reference voltage obtained by adding the first voltage to the second voltage.