Reference Voltage Generator Using Differential Amplification and Reset
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Solution Overview
Problem
Process variations during integrated circuit fabrication negatively impact circuit performance, and existing methods to reduce these variations increase circuit complexity and area.
Innovation Solution
A reference voltage generator is designed with a differential amplification circuit, voltage storage circuits, and feedback loops to minimize process variations by amplifying and stabilizing reference voltages, using switches and capacitors to manage initial voltages and offset corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process variations are reduced by conventional methods, then circuit performance is improved, but circuit complexity and area increase
Solution Approach 1:
The patent applies preliminary action by performing a reset operation before reference voltage generation. During the reset period, the differential amplification circuit is configured to reset by coupling its output to its negative input terminal, establishing a known initial state. This preliminary reset action eliminates the need for complex calibration circuits that would otherwise be required to compensate for process variations, thereby reducing circuit complexity while maintaining manufacturing precision.
Solution Approach 2:
The patent implements periodic action by alternating between reset period and reference voltage generation period through timed switching. Switches are controlled to periodically transition the differential amplification circuit between reset mode and amplification mode. This periodic operation allows the circuit to self-calibrate at regular intervals, reducing process variation effects without requiring permanently complex compensation structures, thus lowering overall device complexity.
2Manufacturing precision
If process variations are reduced by conventional methods, then circuit performance is improved, but circuit area increases
Solution Approach 1:
By performing the reset operation as a preliminary action before reference voltage generation, the patent eliminates the need for large-area permanent calibration structures. The reset period establishes initial conditions using the existing differential amplification circuit components, avoiding the need for additional calibration circuits that would increase area. This temporal separation of reset and generation functions allows precise process variation compensation within the same circuit footprint.
Solution Approach 2:
The differential amplification circuit serves multiple functions: it amplifies voltage differences during the reference voltage generation period and performs reset operations during the reset period. The same switches and circuit components are reused for both amplification and reset functions, eliminating the need for separate dedicated reset circuitry. This multi-functionality reduces the overall circuit area while maintaining the ability to compensate for process variations.
3Measurement precision
If reference voltage precision is improved, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The reset operation serves as a preliminary action that establishes a known initial voltage state in the differential amplification circuit before reference voltage generation begins. By coupling the output terminal to the negative input terminal during reset, the circuit eliminates offset errors and establishes predictable initial conditions. This preliminary reset action improves reference voltage precision by eliminating drift and offset without requiring complex calibration circuits, thereby achieving high measurement precision with minimal increase in device complexity.
Solution Approach 2:
The differential amplification circuit employs feedback by coupling its output terminal to its negative input terminal during the reset period. This feedback mechanism establishes a stable initial state and eliminates offset errors. During the reference voltage generation period, the circuit amplifies the difference between initial voltages applied to the positive and negative input terminals. This feedback-based reset approach improves reference voltage precision while using the same basic circuit components, avoiding the need for additional complex precision reference circuits.
Data Source
AI summary
A reference voltage generator may include: a differential amplification circuit including a positive input terminal coupled to a supply voltage to receive a voltage from the supply voltage and a negative input terminal coupled to an output terminal of the differential amplification circuit, the differential amplification circuit structured to perform a reset operation based on the received voltage from the supply voltage during a reset period and amplify a difference between a first initial voltage applied to the positive input terminal and a second initial voltage applied to the negative input terminal during a reference voltage generation period; and first and second voltage storage circuits coupled to the positive input terminal and the negative input terminal, respectively, and structured to store the first initial voltage and the second initial voltage, respectively.