Reference Voltage Circuit Using Dual Temperature Coefficients
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bandgap reference voltage circuits in power circuits are prone to inaccuracies due to temperature variations, leading to errors in signal signals, and existing solutions either increase circuit complexity or fail to effectively reduce temperature coefficient influences.
Innovation Solution
A reference voltage circuit with temperature compensation is achieved by using a current source and an impedance device to generate a positive temperature coefficient voltage, while a transimpedance device generates a negative temperature coefficient voltage, which are combined to cancel out temperature influences at the output terminal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operational amplifier compensation is used in bandgap reference voltage circuit, then temperature sensitivity is reduced, but circuit complexity is increased
Solution Approach 1:
The patent extracts the operational amplifier from the reference voltage generation path, using only passive components (resistors and transistors) to generate the reference voltage through temperature coefficient compensation. This removes the active compensation stage while maintaining temperature stability through inherent passive component characteristics.
Solution Approach 2:
The patent merges the voltage reference generation and temperature compensation functions into a single integrated circuit block using passive components. The bandgap reference circuit and temperature compensation network are combined to produce a temperature-stable reference voltage without requiring separate operational amplifier stages.
2Device complexity
If simpler circuit design without operational amplifier is used, then circuit complexity is reduced, but temperature coefficient influence is not effectively reduced
Solution Approach 1:
The patent changes the temperature coefficient parameters of the circuit components by selecting specific resistor ratios and transistor configurations. By adjusting these parameters, the circuit inherently compensates for temperature variations without requiring active operational amplifier control, achieving both simplicity and temperature stability.
3Reliability
If bandgap reference voltage circuit is used, then reference voltage is provided, but temperature variations cause inaccuracies in the reference voltage
Solution Approach 1:
The patent converts the harmful effect of temperature variations on semiconductor parameters into a beneficial compensation mechanism. By utilizing the temperature-dependent characteristics of resistors and transistors in a specific configuration, the circuit generates compensating voltages that offset the temperature-induced errors in the reference voltage.
Data Source
AI summary
The present application discloses a reference voltage circuit with temperature compensation, in which a voltage with a positive temperature coefficient is provided by a current source and an impedance device, and in the meanwhile, a voltage with a negative temperature coefficient is provided by a voltage source. Hereby, the reference voltage circuit according to the invention provides a reference voltage with temperature compensation at an output terminal.