Generally speaking, the receiving part of the garage door remote is also divided into two types, namely super heterodyne garage door remote and super regenerative receiving mode garage door remote. The super regenerative demodulation circuit is also called super regenerative detection circuit. In fact, it is a regenerative detection circuit working in the intermittent oscillation state. Superheterodyne demodulation circuit is the same as superheterodyne radio. It is equipped with a local oscillation circuit to generate oscillation signal. After mixing with the received carrier frequency signal, the intermediate frequency (generally 465kHZ) signal is obtained. After intermediate frequency amplification and detection, the data signal is demodulated. Because the carrier frequency is fixed, its circuit is simpler than that of a radio. The superheterodyne receiver has the advantages of stability, high sensitivity and relatively good anti-interference ability; Super regenerative receiver is small and cheap. Easy to solve.
