| 摘要 |
<p>A MMIC based superheterodyne receiver (100) for converting at RF energy in an upper (102) and a lower (104) frequency band includes at least one attenuator (114) for the RF energy input, a mixer (126) for mixing the lower band input with a LO1 signal (106), another mixer (116) for mixing the upper band input with the LO1 signal signal, a switch (134) to direct the LO1 signal to the first mixer or to the second mixer, and a third mixer (136) for mixing a LO2 signal (160) with the first stage mixer output to produce a signal at the output frequency. Passband filters (142) at the outputs of the mixers can reject interfering mixer-generated frequencies. Input frequency range can span 0.1 to 18 GHz with a 160 MHz or 1 GHz output. A modular receiver can have two or more converter modules (110, 150) for each LO module.</p> |
