3.9 RF Interface
E-GOLDvoice features a fully integrated constant-gain direct conversion receiver, i.e. there is no
interstage filter needed and the baseband level at the analogue IQinterface follows directly the RF
input level. Depending on the baseband ADC dynamic range, single- or multiple-step gain switching
schemes are possible.
An integrated, selfaligning, low-pass filter ensures the receivers to function under blocking and
reference interference conditions and avoids aliasing by baseband sampling. An automatic DC-offset
compensation is implemented and can be switched depending on the gain setting.
3. TECHNICAL BRIEF
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Figure 3-9-1. ASM interface
Figure 3-9-2. SAW Filter interface
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