研究目的
Designing a highly integrated dual band FMCW radar receiver for indoor positioning applications, eliminating the need for an off-chip low pass filter.
研究成果
The filterless dual band FMCW radar TRX achieves a high level of integration, comparable performance to previous designs with an external LPF, and meets the requirements for indoor positioning applications. Future work aims at integrating the ADC on-chip for even higher integration levels.
研究不足
The higher baseband bandwidth slightly degrades SNR at lower RF input powers. The design's susceptibility to distortion at very large input amplitudes due to the direct mixer-VGA coupling.
1：Experimental Design and Method Selection:
The design integrates baseband low pass filtering within the variable gain amplifier (VGA), eliminating the need for an external LPF. The RX is part of a dual band FMCW radar transceiver (TRX) fabricated on an IBM 0.18 μm BiCMOS process.
2：18 μm BiCMOS process.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The RX performance is evaluated through simulations and measurements, comparing it with previous versions that used an external LPF.
3：List of Experimental Equipment and Materials:
IBM 0.18 μm BiCMOS process for fabrication, R&S SMBV100 signal generators, R&S RTO2044 oscilloscope for measurements.
4：18 μm BiCMOS process for fabrication, R&S SMBV100 signal generators, R&S RTO2044 oscilloscope for measurements.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The RX's dynamic range, SNR, and IIP3 are measured and compared with simulations. The effect of load capacitance on RX bandwidth and SNR is analyzed.
5：Data Analysis Methods:
Harmonic balance simulations for VGA performance, FFT for IM3 level evaluation, and SNR measurement from antenna to bits using an on-board ADC.
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