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A High-Precision Current-Mode Bandgap Reference with Nonlinear Temperature Compensation.

Zhizhi Chen1,2, Qian Wang1, Xi Li1

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Summary
This summary is machine-generated.

This study presents a high-precision current-mode bandgap reference (BGR) circuit with advanced temperature compensation. The novel design significantly reduces current variations and achieves a low temperature coefficient for improved accuracy.

Keywords:
bandgap current referencecurrent-mode referencehigh-order curvature-compensated techniquetemperature coefficient (TC)

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Area of Science:

  • Electrical Engineering
  • Integrated Circuit Design
  • Semiconductor Devices

Background:

  • Bandgap reference (BGR) circuits are crucial for stable voltage and current references.
  • Achieving high precision in BGR circuits requires effective compensation for temperature-dependent variations.
  • Existing BGR designs often face challenges with nonlinear current behavior and temperature coefficients.

Purpose of the Study:

  • To develop a high-precision current-mode bandgap reference (BGR) circuit.
  • To implement a high-order temperature compensation technique for enhanced accuracy.
  • To overcome limitations of nonlinear current behavior in BGR circuits.

Main Methods:

  • Modified the nonlinear current equation for BGR circuits.
  • Introduced a high-order temperature compensation using a nonlinear compensation bipolar junction transistor (NLCBJT).
  • Implemented two solutions: dividing the NLCBJT branch and injecting nonlinear current to reduce temperature coefficient (TC).

Main Results:

  • Reduced current variations in NLCBJTs from 148.41 nA to 69.35 nA and 7.4 nA.
  • Achieved a low TC of approximately 3.78 ppm/°C over -50 °C to 120 °C.
  • Demonstrated a quiescent current consumption of 42.13 μA and a compact layout size of 0.044 mm².

Conclusions:

  • The proposed high-order temperature compensation significantly improves BGR circuit precision.
  • The modified nonlinear current equation and compensation techniques effectively reduce temperature-induced errors.
  • The developed BGR circuit is suitable for applications requiring high accuracy and stability across a wide temperature range.