Why are direct or flash conversion analog-to-digital converters used for a software defined radio?

A flash conversion analog-to-digital converter (ADC) uses a linear array of comparators to sample an input signal simultaneously. This parallel architecture allows the ADC to process signals incredibly quickly, which is essential for digitizing the high-frequency RF signals directly from the antenna in Software Defined Radios (SDR). Other ADC architectures, like successive approximation, require multiple clock cycles per sample and are generally too slow for direct high-frequency RF sampling. The distractors mentioning power consumption or out-of-sequence coding are incorrect; in fact, flash ADCs typically consume significantly more power due to the massive number of comparators they require.