Demultiplexing Filter Bank With Band-Selective Clock Supply
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Solution Overview
Problem
Conventional demultiplexing and multiplexing devices using Fourier transform circuits cannot reduce power consumption, as they operate on the entire system band and cannot selectively operate on a part of the circuit, leading to inefficient power usage.
Innovation Solution
A demultiplexing device with a reception low-pass-filter group and channel-filter group, along with a filter-bank control unit and clock supply units, that performs frequency conversion, low-pass filtering, and downsampling to reduce the sampling rate, allowing for selective operation and power reduction by stopping clock supply to unused circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a Fourier transform circuit performs processing for the entire system band, then the demultiplexing function is achieved, but power consumption cannot be reduced
Solution Approach 1:
The Fourier transform circuit is divided into multiple independent sub-Fourier transform circuits, each responsible for a specific frequency band. This segmentation allows individual circuits to be activated or deactivated based on the required processing band, enabling selective operation and power reduction when only part of the system band needs processing.
Solution Approach 2:
The system dynamically activates only the necessary sub-Fourier transform circuits based on real-time processing requirements. By controlling the operation state of each sub-circuit according to the actual signal processing needs, the system achieves adaptive power management while maintaining the required demultiplexing functionality.
2Reliability
If the entire Fourier transform circuit operates, then complete signal processing is ensured, but power consumption increases
Solution Approach 1:
The circuit is segmented into multiple independent sub-circuits handling different frequency bands. This allows the system to activate only the specific sub-circuits needed for the current processing task, ensuring complete processing of required signals while avoiding unnecessary power consumption from inactive bands.
Solution Approach 2:
The system changes the operational parameters (activation state) of individual sub-Fourier transform circuits based on the processing requirements. By adjusting which circuits are active versus standby, the system maintains signal processing completeness for required bands while reducing overall power consumption.
Data Source
AI summary
A demultiplexing device that includes frequency-conversion and reception low-pass-filter units that perform a frequency converting process and a low-pass filtering process for causing a signal to pass through a desired band, perform downsampling to reduce a sampling rate to half of a data rate of an input signal, and output the signal, reception channel-filter units that waveform-shape a signal with a desired frequency characteristic and output the waveform-shaped signal. The demultiplexing device also includes a filter-bank control unit that generates a clock control signal for supplying a clock to frequency-conversion and reception low-pass-filter units and reception channel-filter units corresponding to signal passage bands, based on channel information, and a reception-clock supply unit that supplies a clock to frequency-conversion and reception low-pass-filter units and reception channel-filter units corresponding to signal passage bands, based on the clock control signal.