研究目的
To stabilize the pulse width and amplitude of Gaussian Monocycle Pulses (GMP) in a radar-based breast cancer detection system under the influence of MOSFET manufacturing variations by proposing a GMP generator with a calibration circuit.
研究成果
The proposed GMP generator with a calibration circuit successfully stabilizes pulse width and amplitude against MOSFET manufacturing variations, achieving a center frequency of 5.5 GHz, bandwidth from 2.8 GHz to 9.1 GHz, and low power consumption of 498.6 μW. Calibration improves waveform consistency and enables effective peak detection with lower ADC resolution, enhancing the potential accuracy of breast cancer detection systems. Future work should focus on physical implementation and clinical testing.
研究不足
The study is based on simulations using 0.18-μm CMOS technology and may not account for all real-world variations or environmental factors. Physical implementation and testing on actual breast phantoms or human tissues are not covered, limiting validation of cancer detection accuracy. The calibration circuit's effectiveness might be constrained by the precision of MOS cap arrays and control mechanisms.
1：Experimental Design and Method Selection:
The study designed a GMP generator with a calibration circuit using 0.18-μm CMOS technology. The calibration circuit employs a MOS capacitor array to adjust delay times and amplitudes, compensating for MOSFET variations. Simulation methods were used for verification.
2：18-μm CMOS technology. The calibration circuit employs a MOS capacitor array to adjust delay times and amplitudes, compensating for MOSFET variations. Simulation methods were used for verification.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Simulations were conducted using corner models of MOSFETs (e.g., NT-PT, NS-PF) to represent manufacturing variations. No physical samples were mentioned; data were derived from circuit simulations.
3：List of Experimental Equipment and Materials:
The primary material is the 0.18-μm CMOS technology. Equipment includes simulation tools (not specified by brand or model), and components like MOS capacitor arrays with specific dimensions (e.g., W/L=800/400 nm).
4：18-μm CMOS technology. Equipment includes simulation tools (not specified by brand or model), and components like MOS capacitor arrays with specific dimensions (e.g., W/L=800/400 nm).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The GMP generator circuit was designed with logic gates (NOT, AND, OR) to generate up-pulses and down-pulses, combined to form GMP. Calibration involved adjusting control signals (cont1-cont4) to modify delay times and amplitudes via MOS cap arrays. Transient simulations and Fast Fourier Transform (FFT) analyses were performed to evaluate waveform stability and frequency characteristics under different MOSFET models.
5：Data Analysis Methods:
Data were analyzed through transient simulations to observe waveform changes, FFT to assess frequency spectra, and ADC simulations to evaluate peak detection resolution with varying bit resolutions (e.g., 6-bit, 7-bit, 8-bit ADC).
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