A zero-IF DC cancellation circuit and method
A zero-IF, DC component technology, applied in the field of analog signal processing, can solve the problems of large signal loss, DC signal cannot pass through the DC blocking capacitor, complex structure, etc., to avoid the effect of amplifier saturation
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[0018] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0019] Such as figure 1 Shown is a functional block diagram of the zero-IF DC cancellation technology of the present invention. The zero-IF signal generated after down-conversion is directly input to the voltage follower Ⅰ, and then the level of the zero-IF is raised by about 0.7V through the adder, and then the power is divided into two channels, one is directly sent to the differential amplifier, and the other is sent to the effective value The converter converts the DC to the differential amplifier. The two signals are subtracted by the differential amplifier to obtain the AC component of the zero-IF signal, that is, the useful signal.
[0020] The input terminal of the voltage follower Ⅰ is directly connected to the intermediate frequency output port of the down-conversion mixer. Because the input impedance of the voltage followe...
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