FPGA Signal Generator for Adjustable Waveforms With Lower Compute Load
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Solution Overview
Problem
Existing signal generators, particularly those implemented in FPGAs, face challenges in efficiently generating periodic output signals with adjustable amplitude and frequency due to high computational complexity and resource intensity.
Innovation Solution
A signal generator system that uses a processing unit to determine a signal direction and apply a step size to an actual amplitude based on input parameters, allowing for the generation of triangular, square, and sine wave signals with adjustable frequency and amplitude, while leveraging bit shifting and multiplication to reduce computational complexity, enabling efficient operation even in resource-constrained FPGAs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If function generators are used to generate periodic output signals with adjustable amplitude and frequency, then the signal generation capability is improved, but the computational complexity and resource consumption increase significantly
Solution Approach 1:
The signal generation process is divided into separate functional blocks: a counter unit that generates time-base signals, a control unit that processes amplitude and frequency parameters, and an output unit that generates the actual signal. This segmentation allows each block to perform a specific function with reduced computational requirements compared to a monolithic function generator.
Solution Approach 2:
Amplitude and frequency parameters are pre-processed and stored in registers before signal generation begins. The control unit calculates and stores the necessary control values in advance, eliminating the need for complex real-time calculations during signal generation, thus reducing computational complexity.
2Adaptability or versatility
If function generators with adjustable amplitude and frequency are implemented, then the versatility of signal generation is improved, but the resource consumption in FPGA increases
Solution Approach 1:
A single counter unit is designed to generate multiple types of periodic signals (triangular, square, sine waves) by varying the control parameters and output processing. This multi-functional approach eliminates the need for separate hardware circuits for each signal type, significantly reducing FPGA resource consumption while maintaining full versatility.
Solution Approach 2:
The signal generator uses parameter-based control where amplitude and frequency are adjusted by changing numerical values in registers rather than reconfiguring hardware. This allows full adaptability with minimal resource usage, as the same hardware structure generates different signals through parameter modification alone.
3Measurement precision
If complex signal calculations are performed in real-time, then the signal accuracy is improved, but the processing time increases
Solution Approach 1:
The system uses a clocked counter that increments at regular intervals to generate the time base for signal generation. This periodic action ensures consistent timing and signal accuracy while maintaining a steady, predictable processing rate that minimizes overall processing time through efficient use of FPGA clock cycles.
Data Source
AI summary
A signal generator includes a processing unit. The signal generator is configured to generate at least one periodic output signal. The output signal comprises a triangular-waveform signal. A frequency and an amplitude of the output signal are adjustable. The signal generator is configured to receive an input parameter. The input parameter comprises at least one piece of information about a setpoint amplitude and a setpoint frequency of the output signal. The processing unit is configured to determine a signal direction of the output signal. The processing unit is configured to determine a step size. The processing unit is configured to apply the step size to an actual amplitude based on the signal direction for a number of clock cycles. The number of clock cycles is dependent on the setpoint frequency of the output signal.