Filter-Bank Demultiplexing with Selective Clock Gating
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Solution Overview
Problem
Conventional Fourier transform circuits are unable to operate selectively on part of the system band, leading to increased power consumption during demultiplexing and multiplexing processes.
Innovation Solution
A demultiplexing and multiplexing device with a 3-stage configuration that uses frequency-conversion and low-pass filtering units to reduce the sampling rate and filter signals, allowing for selective processing and reducing power consumption by stopping clock supply to unnecessary 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 processing coverage is complete, but power consumption increases
Solution Approach 1:
The system band is divided into multiple sub-bands, and the Fourier transform circuit is segmented into multiple processing units, each responsible for a specific sub-band. This allows selective activation of only those processing units needed for the current operation, reducing overall power consumption while maintaining the ability to process the entire system band when necessary.
Solution Approach 2:
The circuit configuration is made dynamic by enabling selective activation of different processing units based on the actual processing requirements. When only part of the system band needs processing, only the corresponding processing units are activated, allowing the system to adapt its power consumption to the actual workload.
2Use of energy by stationary object
If the entire Fourier transform circuit operates, then all signal bands can be processed, but unnecessary circuits consume power
Solution Approach 1:
The necessary signal processing capability is extracted and isolated into specific processing units that can be independently activated. By taking out only the required processing functions from the entire circuit, the system can maintain full signal processing capability when needed while consuming less power during partial-band operations.
3Use of energy by moving object
If clock supply is continuous to all circuits, then processing is uninterrupted, but power consumption increases
Solution Approach 1:
Clock supply is implemented as a periodic action rather than continuous supply. Clock signals are provided only to the processing units that are currently active and processing signals, creating a periodic activation pattern that reduces power consumption while ensuring that processing is uninterrupted for the active units.
Data Source
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AI summary
To obtain a demultiplexing device that can reduce power consumption. The demultiplexing device includes frequency-conversion and reception low-pass-filter units 101 to 114 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 121 to 128 that waveform-shape a signal with a desired frequency characteristic and output the waveform-shaped signal, a filter-bank control unit 13 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 14 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.