Telink FR1 PCB Design Guideline
AN-22051900-E1 Ver. 1.0.0
15
Figure 4-3 Via hole on carbon film
4.3
Notes
First of all, the layout should consider the placement of the chip, based on the antenna, and reserve
enough space for the antenna first, so as to determine the location of the chip.
According to the board structure requirement, place the components (battery holder, keys, MIC, and
etc., while paying attention that do not place components in the location column area).
The components used for RF matching are close to the RF pins. The ANT circuit is isolated from the
chip and other circuits by ground to avoid signal crosstalk. The capacitors of the LC filter are placed
on both sides of the RF routing as shown in Figure 4-4. The purpose of placing on both sides of the
RF routing is to allow better harmonic regulation. It is best to place a 0R (0 ohm) resistor at its RF
end to improve ground return on both sides of the RF circuit, as shown in Figure 4-4.
The placement of the various capacitors needs to be arranged as suggested below, as shown in Figure
