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direct conversion receiver using a piece of TDA-7000 chip ci

2015-02-04 14:23  
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direct conversion receiver using a piece of TDA-7000 chip circuit
The following figure shows DCR front-end circuit based on TDA-7000 according to Daulton's design. This circuit is designed similarly as others because it also uses the balanced front-end circuit. Besides, internal oscillator has been used as variable frequency oscillator (VFO), just like the typical NE-602 design. The subsequent circuit is similar to typical NE-602 design. But the biggest difference is to use TDA-7000's internal op-amp to provide active band-pass filter.