SBL-1-1 DBM top-level direct conversion receiver audio mixer circuit

Published:2011/6/16 10:28:00 Author:John | Keyword: audio mixer, direct conversion receiver | From:SeekIC

The following figure shows the Lawellen’s another simplified design (original design includes QRP transmitter and DCR). This designed front-end circuit includes an RF and a tuned secondary transformer (L1A). Secondary transformer is raised to resonant state through capacitor C1 and is contacted with 50Ω. Such is to match the input impedance with double-balanced mixer (DBM: Double Balanced Mixer). DBM used here is Mini-Circuits SBL-1-1. But for the original DBM, Lawllen form it by combining the toroidal transformer and the diode.



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