Senstech Sdn. Bhd. MD-H01 Manual De Usuario
6／17
7 Hardware
7.1
Carrier oscillation circuit, ASK modulator circuit, transmission output circuit
Fig. 1 shows carrier oscillation circuit, ASK modulator circuit and transmission output circuit. 13.56MHz
carrier (waveform ①) from U9 oscillation circuit is input to gate 1 of gate IC U2TC7S02. As for Gate2,
on/off of the sending can be done by the waveform ② from U8-11P. U2 output (waveform ③) is input to
inverter IC U1 TC7SZ04. U1 is a transmitting circuit, and Q1 is ASK modulator circuit. Tx data
(waveform⑦) is input to Q1 transistor base, and ASK modulation Signal (waveform④) is output from U1.
It is adjusted with R2 to 10% modulation. Waveform ④ becomes waveform ⑤ by the resonance in L1,
C5, and C26 resonance circuit. DC component of U1 is removed by passing C4 and waveform ⑥ is output
from CN2.
carrier (waveform ①) from U9 oscillation circuit is input to gate 1 of gate IC U2TC7S02. As for Gate2,
on/off of the sending can be done by the waveform ② from U8-11P. U2 output (waveform ③) is input to
inverter IC U1 TC7SZ04. U1 is a transmitting circuit, and Q1 is ASK modulator circuit. Tx data
(waveform⑦) is input to Q1 transistor base, and ASK modulation Signal (waveform④) is output from U1.
It is adjusted with R2 to 10% modulation. Waveform ④ becomes waveform ⑤ by the resonance in L1,
C5, and C26 resonance circuit. DC component of U1 is removed by passing C4 and waveform ⑥ is output
from CN2.