X-frequency-range extra-low inter-modulation frequency converter device of measurement and control system
A frequency converter and frequency band technology, applied in the field of signal receiving equipment with extremely low signal-to-noise ratio, to achieve the effects of suppressing spurious strays, good impedance matching, and easy control
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[0012] Reference figure 1 , X-band isolator 1, X-band filter 2, X-band mixer 3, a local oscillator isolator 4, an intermediate frequency low pass filter 5, an intermediate frequency band pass filter 6, an intermediate frequency amplifier 7, the second Mixer 8, two local oscillator isolators 9, two intermediate frequency low pass filters 10, two intermediate frequency band pass filters 11, programmable attenuators 12 and two intermediate frequency amplifiers 13.
[0013] In the present invention, the X-band isolator 1 performs microwave isolation processing on the externally input radio frequency signal and outputs it to the X-band filter 2, and the X-band filter 2 filters out spurious and interference signals in the input signal, and sends it to the X-band mixer. RF input port of frequency converter 3; a local oscillator input is subjected to impedance matching by a local oscillator isolator 4, and then sent to the local oscillator input port of X-band mixer 3; X-band mixer 3 per...
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