Filter amplifier
A filter amplifier and amplifier technology, applied in the direction of frequency selection two-terminal-to-network, multi-terminal-to-network, etc., can solve problems such as failure to achieve filtering performance, TV programs cannot be viewed normally, and achieve good replication and scalability. and improve the effect of low cost
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[0018] Further description will be made below in conjunction with drawings and embodiments.
[0019] Such as figure 1 As shown, a filter amplifier 10 is composed of a first mixer (MIXER1) 1, a first SAW filter (SAW1) 2, a gain controllable amplifier (VGA) 3, a second SAW filter connected in sequence (SAW2) 4 and the second mixer (MIXER2) 5. The first mixer (MIXER1) 1 accepts the input signal RFIN and the first local oscillator signal LO1, and down-converts the input signal RFIN to an intermediate frequency signal; the first sound The surface filter (SAW1) 2 filters the intermediate frequency signal and outputs it to the gain-controllable amplifier (VGA) 3 for signal amplification, and the amplified signal is then input to the second SAW filter (SAW2) 4 for re-filtering The final signal is up-converted by the second mixer (MIXER2) 5 to the original frequency of the input signal RFIN, and then the output signal RFOUR is output; the first local oscillator circuit 6 is connected ...
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