Bandgap Reference Circuit Single Amplifier Temperature Compensation
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Solution Overview
Problem
Traditional constant current sources employing multiple amplifier bandgap reference circuits consume significant power and space, and exhibit current variation across operating temperatures due to temperature-dependent physical properties of components.
Innovation Solution
A bandgap reference circuit with a single amplifier and a feedback path using a bandgap transistor and resistors, which generates temperature-independent constant current by balancing currents with opposite temperature dependencies, reducing power and space consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple amplifier bandgap reference circuits are used, then current stability across temperatures is improved, but power consumption and circuit space increase substantially
Solution Approach 1:
The patent extracts and eliminates redundant amplifiers from the traditional multiple-amplifier bandgap reference circuit, retaining only a single amplifier while preserving temperature compensation functionality through a simplified architecture involving a bandgap transistor and resistor network
Solution Approach 2:
The patent combines the functions of multiple amplifiers into a single amplifier by integrating temperature compensation directly into the feedback path using a bandgap transistor, merging reference generation and temperature stabilization into one unified circuit block
2Reliability
If multiple amplifier bandgap reference circuits are used, then current stability across temperatures is improved, but circuit space increases significantly
Solution Approach 1:
The patent removes unnecessary amplifier stages and associated components from the circuit, extracting only the essential elements needed for bandgap reference functionality while reducing overall circuit footprint
Solution Approach 2:
The patent merges multiple functional blocks into a compact integrated structure where the single amplifier works in conjunction with the bandgap transistor and resistors to achieve both reference voltage generation and temperature compensation in a minimized area
3Reliability
If traditional multiple amplifier circuits are used, then temperature compensation is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and removes redundant amplifier stages and complex feedback networks from the traditional design, retaining only the essential single amplifier and simple resistor network needed for effective temperature compensation
Solution Approach 2:
The patent combines temperature sensing, reference voltage generation, and compensation functions into a unified simple circuit architecture where the bandgap transistor provides intrinsic temperature compensation without requiring multiple separate amplifier stages
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a temperature-independent constant current output with reduced power and space requirements, maintaining stability across varying temperatures.
Implementation Method 1
A bandgap reference circuit with a single amplifier and a feedback path using a bandgap transistor and resistors, which generates temperature-independent constant current by balancing currents with opposite temperature dependencies
Data Source
AI summary
An apparatus is described comprising a bandgap reference circuit comprising: an amplifier including first and second inputs and an output; and a bandgap transistor coupled to the output of the amplifier at a control electrode thereof, the bandgap transistor being further coupled commonly to the first and second inputs of the amplifier at a first electrode thereof to form a feedback path. The apparatus further comprises a resistor coupled to the first electrode of the bandgap transistor.