Clock Signal Generator Using CTAT/PTAT Current Temperature Compensation
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Solution Overview
Problem
Semiconductor memory devices face challenges in maintaining consistent clock signal cycles due to variations in temperature, necessitating effective temperature compensation methods for clock signals.
Innovation Solution
A clock signal generator that utilizes a bandgap reference voltage to generate complementary to absolute temperature (CTAT) and proportional to absolute temperature (PTAT) currents, combined with temperature-variable and temperature-fixed voltages, to alternately charge and discharge capacitors, ensuring linear clock signal cycles across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional clock signal generator is used, then the circuit is simple, but the clock cycle varies non-linearly with temperature changes
Solution Approach 1:
The temperature compensation is achieved by segmenting the current generation into multiple components: a first current with first curvature characteristic, a second current with second curvature characteristic, and an offset current. These segmented current components are combined to form the reference current, allowing independent optimization of each segment's temperature response to achieve overall linear clock cycle characteristics.
Solution Approach 2:
The invention changes the parameters of the reference current by dynamically adjusting multiple current components based on temperature. The first and second currents have different curvature characteristics that are combined, and an offset current is added to compensate for temperature-induced variations, transforming the non-linear clock cycle into a linear one across temperature ranges.
2Reliability
If temperature compensation circuits are added to maintain clock cycle consistency, then the clock cycle stability improves, but the power consumption increases
Solution Approach 1:
The temperature compensation mechanism operates autonomously by automatically generating and adjusting the reference current components based on temperature conditions. The circuit self-regulates the clock cycle linearity without requiring external control signals or additional power management circuits, achieving reliable temperature compensation while minimizing power overhead.
3Measurement precision
If multiple current sources with different curvature characteristics are combined, then temperature compensation accuracy improves, but the device complexity increases
Solution Approach 1:
The invention merges multiple current sources with different temperature characteristics (first current with first curvature, second current with second curvature, and offset current) into a unified reference current. This combining of diverse current components allows the system to achieve high temperature compensation accuracy by leveraging the complementary characteristics of each current source.
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 generator achieves linear and temperature-compensated clock signals with low power consumption, maintaining consistent cycle lengths despite environmental temperature fluctuations.
Implementation Method 1
receiving a bandgap reference voltage from a bandgap reference circuit
Implementation Method 2
generating a first complementary to absolute temperature (CTAT) current
Data Source
AI summary
A method of generating clock signals includes: receiving a bandgap reference voltage from a bandgap reference circuit; generating a first current having a first curvature characteristic based on the bandgap reference voltage; generating a second current having a second curvature characteristic based on the bandgap reference voltage; generating a first complementary to absolute temperature (CTAT) current by adding the first current to the second current; receiving a temperature-variable voltage and a temperature-fixed voltage from a voltage generator; generating an offset current based on the temperature-variable voltage and the temperature-fixed voltage; generating a reference current by adding the first CTAT current to the offset current; and generating the clock signals by alternately discharging a first capacitor and a second capacitor based on the reference current, and charging the first capacitor and the second capacitor based on a power voltage.