Sensor Receiver Band-Pass Filter With Isolated Gain Control
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Solution Overview
Problem
Existing sensor devices face challenges in independently setting parameters such as center frequency and gain for band pass filters, which are crucial for meeting system requirements in electronic devices like smartphones and navigation systems.
Innovation Solution
A sensor device with a multi-path filter and a buffer that isolates the filter from a gain amplifier, allowing independent setting of center frequency and gain, and a charge amplifier to receive sensing signals for filtering and amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional band pass filter using an operational amplifier, resistor, and capacitor is used, then the filter can be implemented with simple components, but the parameters such as center frequency, Q-factor, and gain cannot be independently set
Solution Approach 1:
The band pass filter is divided into separate functional modules: a multi-path filter module for setting center frequency and Q-factor, and a gain amplifier module for setting gain. This segmentation allows each parameter to be controlled independently through its dedicated module, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
A buffer is introduced as an intermediary component between the multi-path filter and the gain amplifier. This buffer isolates the two modules, preventing mutual interference and enabling independent parameter adjustment without requiring complex coupling circuits.
2Adaptability or versatility
If the multi-path filter and gain amplifier are directly connected, then the device complexity is reduced, but the parameters cannot be independently controlled due to mutual interference
Solution Approach 1:
A buffer is introduced as an intermediary component between the multi-path filter and the gain amplifier. This buffer isolates the two modules, preventing mutual interference and enabling independent parameter adjustment without requiring complex coupling circuits.
3Measurement precision
If sensing signals are processed without proper isolation between stages, then the circuit is simpler, but signal processing precision deteriorates due to loading effects and noise
Solution Approach 1:
A buffer is introduced as an intermediary component between the multi-path filter and the gain amplifier. This buffer isolates the two modules, preventing mutual interference and enabling independent parameter adjustment without requiring complex coupling circuits.
Data Source
AI summary
A sensor device of the present invention includes first sensors receiving a plurality of driving signals; second sensors outputting a plurality of sensing signals in response to the driving signals; and a sensor receiver connected receiving the sensing signals from the second sensors, and including a band pass filter filtering the sensing signals. The band pass filter includes a multi-path filter in which a frequency of the driving signals is set as a center frequency; a gain amplifier amplifying signals filtered through the multi-path filter according to a predetermined gain value; and a buffer isolating the multi-path filter and the gain amplifier from each other.