Oscillation Module High-Pass Filter Capacitance Array Frequency Control
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Solution Overview
Problem
Existing oscillation circuits face challenges in efficiently managing changes in oscillation frequency and frequency band, particularly when using SAW filters, due to limitations in frequency control and circuit area optimization.
Innovation Solution
The oscillation module incorporates a high-pass filter with a capacitance array and a coil part, where the capacitance array includes multiple capacitances connected in specific configurations to adjust the frequency band, allowing for flexible adjustment of the oscillation frequency without significant changes in circuit area or cost, by varying the capacitance values and wiring lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the oscillation frequency is changed by changing the SAW filter, then the frequency band can be adjusted, but the turnaround time increases and cost increases
Solution Approach 1:
The capacitance array is pre-configured with multiple capacitance values during manufacturing, allowing the high-pass filter to quickly switch between different frequency bands by simply changing the capacitance configuration without requiring physical filter replacement or complex recalibration procedures
Solution Approach 2:
The high-pass filter incorporates a dynamically adjustable capacitance array that can be reconfigured to change the cutoff frequency and passband characteristics, enabling the system to adapt to different oscillation frequencies rapidly through electronic switching rather than mechanical or physical changes
2Adaptability or versatility
If the oscillation frequency is changed by changing the SAW filter, then the frequency band can be adjusted, but the cost increases
Solution Approach 1:
The high-pass filter with capacitance array serves multiple functions: it acts as a frequency-selective filter while simultaneously providing frequency band adjustment capability through the switchable capacitance configurations, eliminating the need for multiple dedicated filters for different frequency bands
Solution Approach 2:
The system achieves frequency band adjustment by changing the capacitance parameter values in the capacitance array rather than changing the entire SAW filter, allowing cost-effective frequency adaptation through parameter modification of existing circuit components
3Measurement precision
If the capacitance array is configured to adjust frequency band, then frequency accuracy is enhanced, but circuit complexity increases
Solution Approach 1:
The capacitance array is divided into multiple discrete capacitance elements that can be independently switched or combined, allowing precise frequency adjustment through selective activation of specific capacitance segments rather than using a single variable capacitor
Solution Approach 2:
The capacitance array is integrated directly into the high-pass filter circuit structure, merging the frequency adjustment function with the filtering function in a single unified circuit block, thereby reducing overall system complexity despite the enhanced frequency control capability
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
This configuration enables precise control over the oscillation frequency, reduces variations in impedance and parasitic capacitance, and enhances frequency accuracy, allowing for efficient handling of frequency changes while minimizing circuit size and cost.
Implementation Method 1
the capacitance part includes a capacitance array
Implementation Method 2
the high-pass filter has a coil part, a capacitance part, and a first interconnection adapted to connect the coil part and the capacitance part to each other
Data Source
AI summary
An oscillation module includes an SAW filter, and a high-pass filter formed in an integrated circuit, the high-pass filter has a coil part, a capacitance part, and a first interconnection adapted to connect the coil part and the capacitance part to each other, and the capacitance part includes a capacitance array.