A/D Conversion Range Switching for Higher Bit Precision

The patent implements dynamic switching between two conversion ranges (first conversion range with lower resolution and second conversion range with higher resolution) based on the input signal level. When the input signal is small, the system switches to the second conversion range to achieve higher bit precision. This dynamic adaptation resolves the contradiction by making the resolution switching responsive to actual signal conditions rather than fixed, thereby maintaining both high precision and reliable tracking.

The patent changes the amplification factor parameter dynamically based on the input signal level. For small input signals, a larger amplification factor is applied to expand the signal into the AD converter's optimal range, achieving higher bit precision. For larger input signals, a smaller amplification factor is used to avoid saturation and reduce conversion errors. This parameter adaptation resolves the contradiction between bit precision and conversion error.

The patent segments the conversion range into two distinct ranges: a first conversion range for larger input signals and a second conversion range for smaller input signals. Each range has its own optimized amplification factor and resolution characteristics. This segmentation allows the system to achieve high bit precision across the entire input range while keeping each segment relatively simple, resolving the contradiction between precision and complexity.