sound surface wave resonator application circuit in the wireless remote control

Published:2011/7/9 9:43:00 Author:Lena | Keyword: sound surface wave, resonator, application circuit, wireless remote control | From:SeekIC

R11-R13, Q1 and Q2 form electron switch modulation circuit, when encoder outputs high level, Q1 conducts, and oscillator emitter electrode works. When encoder outputs low level, Q1 stops to complete ASK modulation. R14, Q3, C1, L1, L2 and sound surface resonator SAW constitutes 315MHZ power master oscillator, Q3 is a high frequency field effect transistor, which can output 1.5W power at 450MHz.



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