Feedback Delay Circuit for Voltage and Process Drift Control
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Solution Overview
Problem
Existing delay circuits in semiconductor elements, particularly in Dynamic Random Access Memory (DRAM), face significant variations in delay time due to power supply voltage, operating temperature, and manufacturing process variations, affecting accuracy.
Innovation Solution
A control circuit with a feedback unit and a potential generating circuit that adjusts the voltage to compensate for variations in power supply voltage, operating temperature, and manufacturing process, ensuring a consistent delay time by adjusting the current through transistors in the delay unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional delay circuit is used without compensation mechanisms, then the circuit structure remains simple, but the delay time varies significantly with power supply voltage, operating temperature, and manufacturing process
Solution Approach 1:
The patent implements a feedback mechanism where a feedback unit monitors the control voltage and compares it with a reference voltage. Based on this comparison, the control unit adjusts the control voltage to compensate for variations in delay time caused by power supply voltage, temperature, and manufacturing process differences, thereby maintaining accurate delay time without excessive circuit complexity
Solution Approach 2:
The patent changes the control voltage parameter dynamically to compensate for delay time variations. By adjusting the control voltage based on feedback from the feedback unit, the system counteracts the effects of power supply voltage fluctuations, temperature changes, and manufacturing variations, maintaining consistent delay time accuracy
2Measurement precision
If the control voltage is adjusted to compensate for parameter variations, then the delay time accuracy is improved, but the current variation of the control unit increases
Solution Approach 1:
The feedback unit monitors the control voltage and provides feedback to the control unit, enabling precise adjustment of the control voltage to achieve accurate delay time while minimizing unnecessary current variations. The feedback mechanism ensures that current is only adjusted when needed to compensate for actual parameter variations
Solution Approach 2:
The patent carefully controls the change in control voltage parameter to achieve the minimum necessary adjustment for delay time accuracy. By precisely managing the voltage adjustment, the system reduces unwanted current variations in the control unit while still achieving the required delay time precision
Data Source
AI summary
A control circuit and a delay circuit are provided. The control circuit includes a control unit and a feedback unit. The feedback unit is configured to output a feedback signal according to a voltage of the control unit and a reference voltage; a first terminal of the feedback unit is connected to a first terminal of the control unit, a second terminal of the feedback unit serves as an input terminal of the reference voltage, and an output terminal of the feedback unit is connected to a second terminal of the control unit. The control unit is configured to adjust a voltage of the second terminal of the control unit according to the feedback signal, so as to allow a current variation of the control unit with a first parameter to be within a first range.