| 摘要 |
A system and method for programmable high precision quantization of analog variable is provided. A signal conversion circuit includes a digital switch subtractor, an ADC, and a counter/adder. During the ADC's first sampling stage, the digital switch subtractor activates a bypass switch that allows the ADC to sample an original analog input signal and generate a first digital value using the original analog input signal. During the ADC's second sampling stage, the digital switch subtractor configures resistor network switches based upon the first digital value, thereby creating a voltage drop across the resistor network when the original analog input signal is applied. As a result, the digital switch subtractor's output is a modified analog signal, which the ADC samples and generates a second digital value. The counter/adder combines the first digital value and the second digital value to produce a digital output that a computer system processes.
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