W55RFS27R1B Datasheet, PDF (14/15 Pages) Winbond – SUPER-REGENERATION RF RECEIVER

W55RFS27R1B
When following the sequence above, the switching time T should be based on the data repeat time of
the transmitter. Usually, the switching time is twice the repeat time. For example, if a transmitter sends
data every 10 ms, then the switching time T should be 20 ms.
4.3 W55RFS27R1B Layout Guide
a). Make the antenna signal input path (ANT->C1->L0,C2,C3) as short as possible, and keep it away
from any sources of noise.
b). Place the oscillation tank components (L0,C2,C3) as close to each other as possible and as close
to the OSCin and OSCout pins as possible.
c). Make the oscillator ground return path (GNDA) as short and as wide as possible to GNDA. Keep
this path isolated from noise sources too.
Antenna
OSCin
OSCout
L0
Reduce Loop
GNDA
Pic.1 Graphic representation for a),b),c)
d). Separate the oscillation tank ground from the other ground paths, and connect it directly to GNDA.
Antenna
OSCin
OSCout
L0
Motor Driver & other’s
Ground
COB area _GND
Battery
GND
GNDA
Pic.2 Graphic representation for d)
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