Микроконтроллеры

Сейчас очень многие АЦП рассчитаны на такое дело (undersampling). Т.е., к примеру, далеко не новый недорогой 10-битный AD9200 имеет макимальную частоту дискретизации 20MHz, но при этом 300MHz@-3dB полосу аналогового тракта. The AD9200 is well suited for various narrowband IF sampling applications. The AD9200’s low distortion input SHA has a full-power bandwidth extending to 300 MHz thus encompassing many popular IF frequencies. A DNL of ±0.5 LSB (typ) combined with low thermal input referred noise allows the AD9200 in the 2 V span to provide 60 dB of SNR for a baseband input sine wave. Also, its low aperture jitter of 2 ps rms ensures minimum SNR degradation at higher IF frequencies. In fact, the AD9200 is capable of still maintaining 56 dB of SNR at an IF of 135 MHz with a 1 V (i.e., 4 dBm) input span.