ADAPTIVE MULTIPLE CONVERSION RAMP ANALOG-TO-DIGITAL CONVERTER

摘要

An example ramp analog-to-digital converter (ADC) for generating at least one bit of a digital signal includes a modified ramp signal generator, a comparator, and a control circuit. The modified ramp signal generator receives a ramp signal and generates a modified ramp signal in response thereto. The comparator compares an analog input with the modified ramp signal. The control circuit controls the modified ramp signal generator, such that the analog input is converted a variable M number of times for each period of the ramp signal. The number M is dependent on a magnitude of the analog input. In one example, the number M is greater for analog inputs of a lower magnitude, such that the analog inputs of the lower magnitude are converted more times than analog inputs of a higher magnitude.

主权项

1. An adaptive analog-to-digital converter (ADC) for generating at least one bit of a digital signal, the adaptive ADC comprising:
a modified ramp signal generator coupled to receive a ramp signal and to generate a modified ramp signal in response thereto; a comparator to be coupled to compare an analog input with the modified ramp signal; and a control circuit coupled to control the modified ramp signal generator, such that the analog input is converted a variable M number of times for each period of the ramp signal, wherein the number M is dependent on a magnitude of the analog input, and wherein the modified ramp signal includes M number of complete periods for each period of the ramp signal.