Digital Receiver Overview


1. The majority of amateur radio receivers and transceivers developed within the last ten years or so contain an analogue front end and frequency conversion architecture down to a low frequency base band, usually less than 50KHz. Here the IF signal is digitised, filtered, detected and converted back into an analogue audio frequency signal which is amplified and presented to the user via the loudspeaker or headphones. The following simplified block diagram shows the major steps:

2. Much more recent developments have significantly reduced the amount of analogue circuitry and replaced it with digital processing as shown in the following simplified block diagram: