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K-MC3 データシート(PDF) 5 Page - RFbeam Microwave GmbH |
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K-MC3 データシート(HTML) 5 Page - RFbeam Microwave GmbH |
5 / 8 page K-MC3 RADAR TRANSCEIVER Datasheet Application Notes Using VCO and Internal IF Amplifier The IF amplifier provides two outputs per channel according to Fig. 1. These outputs are designed for different requirements in processing radar signals. Both I (imaginary) and Q (real) mixer signals are available. The I and Q signals are phase shifted by +90° or -90°, depending on the moving direction of objects in range. FMCW generates an output signal even without an object in range because of the finite isolation between transmitter and receiver path. This effect is called self-mixing and leads to a DC signal that depends on the carrier frequency. Using FMCW, these signals move and may overdrive the 2nd stage (x_AC outputs) of the IF amp under certain circumstances. Example showing a single target: Triangle VCO Amplitude: 8Vpp Triangle periodTM = 14ms. Modulation depth fM = 160MHz IF output freq. fb = 450Hz I_AC and Q_AC outputs show a low frequency caused by local carrier feedthrough. The superposed higher frequency fb is often called beat frequency, caused by a target at a distance of about 3m. Fig. 5: x_AC Output FMCW signals with triangle VCO and df = 85MHz Distance calculation R = c 0 2 ⋅ f b f M ⋅ T M 2 = 3m approx For legend refer to Fig. 5 R Range, distance to target c0 Speed of light (3 * 108 m/s) Please contact RFbeam Microwave GmbH for more informations on FMCW and also on FSK applications. I_AC and Q_AC High Gain Outputs These outputs provide high gain/low noise signals generated by doppler effects or FMCW. They di- rectly can drive ADC input stages of microprocessors or DSPs. Even with 10Bit of resolution only, sensitive and relatively long range Doppler detections are possible. The outputs cover a frequency range of 40Hz ... 15kHz. However, these outputs may saturate and clip because of too high input signals. In these cases you may use the x_DC outputs described below. © RFbeam Microwave GmbH, Schuppisstrasse 7, CH-9016 St. Gallen Page 5/8 |
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