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K-MC4 数据表(PDF) 9 Page - RFbeam Microwave GmbH |
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K-MC4 数据表(HTML) 9 Page - RFbeam Microwave GmbH |
9 / 11 page K-MC4 MONOPULSE RADAR TRANSCEIVER Datasheet Rapid Sleep Wakeup (RSW) RFbeam's unique rapid sleep wakeup feature allows power savings of more than 90% during 'silent' periods. The module may be used in a relaxed sampling mode as long as no movements are detected. RSW also helps saving power, if the full IF bandwidth is not needed. In battery operated equipment such as traffic control, RSW may significantly lower battery and equipment volume and cost. RSW Principle K-MC4 contains a high speed variant of RSW without internal S&H device. RSW combines switching of the RF oscillator and an isolation of the following IF amplifier (please refer to Fig. 1: K-MC4 Blockdiagram). During sleep mode (pin /ENABLE = high), only the amplifiers stay supplied to hold the output center voltage. IF output signals are active, as soon as /Enable is low, otherwise IF outputs fall back to their DC level which is Vcc/2. Fig. 10: Sampled Doppler signal (1.3kHz) at IF I or Q outputs Ts = ton + toff ton min = 5µs tOFF max = 2ms duty cycle d = 100* ton / Ts > 0.25% Example for calculationg power saving: Max object speed to detect = 200km/h -> fdoppler = 200km/h * 44Hz = 8.8kHz -> fs = 20kHz to meet Nyquist criteria -> Ts = 1/fs = 50us -> d = 100% * 5µs/50us = 10% Note: With undersampling during silent periods, much more power saving is possible Fig. 11: Detailed RSW sampling behaviour © RFbeam Microwave GmbH, Schuppisstrasse 7, CH-9016 St. Gallen Page 9/11 200us/div IF Output (DC-level = 2.5V) /Enable 50us/div / Enable IF Output Zoomed IF 50us/div /Enable IF Output Zoomed IF ton toff Ts |
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类似说明 - K-MC4 |
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