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K-MC3 データシート(PDF) 5 Page - RFbeam Microwave GmbH

部品番号 K-MC3
部品情報  RADAR TRANSCEIVER
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メーカー  RFBEAM [RFbeam Microwave GmbH]
ホームページ  https://www.rfbeam.ch/
Logo RFBEAM - RFbeam Microwave GmbH

K-MC3 データシート(HTML) 5 Page - RFbeam Microwave GmbH

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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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