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27MHZ to 67MHz Low-RF Single-Conversion Superhet Receiver
Receiver ICs with fully integrated VCOs are very welcome to the system designer because there is no need for external VCO components like varactor diodes or inductors. On the other hand, a fully integrated VCO typically has a limited LO frequency range that restricts the receiver’s operating frequency range. The frequency translation scheme of a standard double-conversion superhet (DCSH) receiver follows the rule that the highest frequency of operation (high-RF) is down-converted by the first mixer to a lower frequency of operation (low-RF) that constitutes the first IF. Then a second mixer handles the next step of down-conversion to derive the second IF. It follows logically that the operating frequency range of a DCSH should be down-scalable if the first mixer could be bypassed to make the second mixer’s input to be the terminal of the desired signal frequency (now the low-RF). Then the DCSH is transformed to a single-conversion superhet (SCSH) receiver.
location: Concord, NH
Current Revision:
002
File Type: Application Note
File Size: 164.8 KB
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