RC Oscillator Switching Matrix for Frequency Shift Compensation
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Solution Overview
Problem
RC-type oscillator circuits in semiconductor integrated circuits experience undesired frequency shifts due to manufacturing processes and mechanical stresses during packaging, which are difficult and costly to compensate.
Innovation Solution
An oscillator circuit design featuring a switching matrix that selectively connects current generators to capacitors and a resistor, allowing for iterative connection configurations to reduce frequency variations by offsetting current deviations, thereby stabilizing the clock signal frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RC-type oscillator circuits are integrated in semiconductor chips without outer crystals or inductors, then the device complexity is reduced and integration is improved, but manufacturing precision deteriorates due to frequency shifts caused by manufacturing processes and mechanical stresses
Solution Approach 1:
The patent applies parameter changes by using multiple current generators with different current values and multiple capacitors with different capacitance values. By varying these electrical parameters and combining them in different configurations, the circuit can compensate for frequency shifts caused by manufacturing variations. The switching matrix enables dynamic reconfiguration of these parameters to optimize frequency accuracy while maintaining integration.
Solution Approach 2:
The oscillator circuit is segmented into multiple independent functional blocks: multiple current generators, multiple capacitors, and a switching matrix. This segmentation allows each component to be independently designed and optimized, and enables the system to compensate for manufacturing variations by selectively combining segments in different configurations, thereby improving frequency accuracy without increasing overall device complexity.
2Manufacturing precision
If calibration is performed after packaging to compensate for mechanical stress-induced frequency shifts, then frequency accuracy is improved, but the manufacturing process becomes more complex and expensive
Solution Approach 1:
The patent implements preliminary action by pre-configuring multiple current generators and capacitors with different parameters before packaging. The switching matrix is designed to enable post-fabrication reconfiguration, allowing frequency calibration to be performed after packaging without requiring complex external equipment. This preliminary setup of multiple configurable elements enables simple on-chip calibration that compensates for mechanical stress effects.
Solution Approach 2:
The oscillator circuit incorporates self-service calibration capabilities through the switching matrix and control logic that can automatically adjust the circuit configuration to compensate for frequency shifts. The circuit uses its own internal resources (multiple current generators, capacitors, and switching elements) to perform calibration without requiring external calibration equipment or complex manufacturing processes, thereby improving frequency accuracy while maintaining manufacturing simplicity.
3Manufacturing precision
If multiple current generators and capacitors are used with switching matrix configuration, then frequency accuracy is improved by compensating manufacturing errors, but device complexity increases
Solution Approach 1:
The switching matrix serves multiple functions: it selects different current generator-capacitor combinations, enables frequency calibration, and provides circuit reconfiguration for different operating conditions. This multi-functionality allows the same hardware elements to achieve frequency accuracy improvement without proportionally increasing device complexity, as the switching matrix and control logic perform multiple tasks simultaneously.
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 design effectively reduces frequency shifts by compensating for manufacturing-induced errors, resulting in a more accurate and reliable clock signal with reduced error terms, improving the stability of the clock signal period.
Implementation Method 1
a first capacitor (c1) provided with a first terminal (16)
Implementation Method 2
a first current generator (g1) provided with a first connection terminal (14)
Implementation Method 3
a resistor (r) provided with a third terminal (18)
Data Source
AI summary
An oscillator circuit including a first capacitor provided with a first terminal; a resistor provided with a reference terminal; a first current generator provided with a connection terminal; a second current generator provided with a second connection terminal. Further, the circuit includes a switching matrix between the first and second generators and resistor and the at least one first capacitor.