Semiconductor Memory Clock Circuit With Temperature-Stable Oscillation
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Solution Overview
Problem
The frequency of the clock generated by existing semiconductor memory apparatus circuits varies significantly with temperature changes, leading to erroneous operations.
Innovation Solution
A circuit that includes a reference voltage generator, a reference current generator producing a constant current unaffected by temperature changes, and an oscillator that uses this reference current to maintain a constant clock frequency, utilizing positive and negative temperature coefficient voltages to stabilize the current output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional clock generation circuit using a resistor and capacitor is used, then the circuit structure is simple, but the clock frequency changes significantly with temperature
Solution Approach 1:
The patent changes the parameters of the circuit components to compensate for temperature effects. Specifically, it selects a resistor with a positive temperature coefficient and a capacitor with a negative temperature coefficient, so that their combined effect cancels out temperature-induced frequency drift, maintaining stable clock frequency across temperature variations.
Solution Approach 2:
The patent uses a composite approach by combining components with opposite temperature characteristics (positive temperature coefficient resistor and negative temperature coefficient capacitor) to create a temperature-compensated clock circuit. This composite structure leverages the opposing thermal behaviors to achieve frequency stability.
2Reliability
If temperature compensation components are added to stabilize clock frequency, then clock frequency stability improves, but circuit complexity increases
Solution Approach 1:
The patent achieves temperature compensation by carefully selecting component parameters (resistor with positive temperature coefficient, capacitor with negative temperature coefficient) rather than adding complex active compensation circuits. This parameter-based approach provides frequency stability while keeping the circuit structure relatively simple.
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 ensures the clock frequency remains constant across temperature variations, stabilizing the operation of semiconductor memory apparatuses.
Implementation Method 1
a reference voltage generator that generates a reference voltage, a reference current generator that generates a reference current that has a constant current value regardless of a change in temperature
Implementation Method 2
a reference current generator that generates a reference current that has a constant current value regardless of a change in temperature
Data Source
AI summary
A circuit for generating a clock of a semiconductor memory apparatus is provided. A reference voltage generator is configured to generate a reference voltage. A reference current generator is configured to generate a reference current that has a constant current value regardless of a change in temperature. An oscillator is configured to receive the reference voltage and the reference current to generate a clock that has constant frequency.