Analog-to-digital conversion circuit and method for main and secondary gradients

The invention relates to an analog-to-digital conversion circuit and method for main and secondary gradients. The method comprises: a gradient modulator processes a ramp voltage to generate a main gradient ramp voltage and a secondary gradient ramp voltage; a signal voltage and the main gradient ramp voltage are compared, a value M of a counter is recorded by digital processing, a control signal outputted by a high-speed comparator is sent to the gradient modulator, and the gradient modulator modulates the control signal, wherein the M1 is a binary number; and the signal voltage is compared with the secondary gradient ramp voltage and a value M2 of the counter is recorded by digital processing, wherein the M2 is a binary number; and according to the M1 and the M2, a digital output value M is obtained, wherein the M is a binary number. 本发明涉及种主次斜率模数转换电路和方法，包括：斜率调制器将斜坡电压生成主斜率斜坡电压和次斜率斜坡电压；将信号电压与所述主斜率斜坡电压进行比较，并通过数字处理记录计数器的值M1，并将高速比较器输出的控制信号发送给所述斜率调制器，所述斜率调制器将所述控制信号进行调制，其中，M1为二进制数；将信号电压与次斜率斜坡电压进行比较，并通过数字处理记录计数器的值M2