universal IF amplifier circuit

Published:2011/7/10 20:11:00 Author:John | Keyword: IF amplifier | From:SeekIC

Crystal filters and mechanical filters all require specific coupling mechanism. The picture shows the coupling connection of the crystal filter which is between two bipolar transistors. Each level of the amplifier is a common emitter bipolar transistor amplifier. Bias voltage is set by the R1/R2 and R5/R6. And the connection to the filter circuit is direct, where the signal is not sensitive to the DC filter (thus this can not be called a mechanical filter). Figure shows another coupling connection, which is alternative both for mechanical filters and crystal filter.



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