Programmable gain control amplifier with multi-stage structure including analog / digital converter and its gain error correction method

摘要

The present invention relates to a programmable multi-stage gain control amplifier including an analog-to-digital converter and a gain error correction method according thereto, comprising: a memory for storing a predetermined correction value; It has a normal operation and a correction operation mode, and in the correction operation mode to cut off the external input voltage (v _in ) and the external gain control bit, output a specific voltage and a gain control code to be internally corrected, and corresponding correction Gain control and correction means for controlling a value to be stored in a corresponding address of the memory, and in the normal mode, inputting an external input voltage and a gain control bit applied externally to read a correction value stored in the corresponding address of the memory. ; First sub gain means for determining an external input voltage by a gain control code output from the gain control and correction means; First analog / digital conversion means for inputting and quantizing the analog gain amplified by the first sub gain means; The input voltage is delayed for a predetermined time, the first voltage V _A obtained by the analog voltage V _IN1 amplified by the first sub gain means and the quantized voltage D _IN , and the delay voltage V. Gain means for adding and outputting the second voltage V _B obtained by the gain voltage or the ground voltage of _1N2 ), and converting the output analog voltage into digital output; And digitally correcting a gain error by inputting a voltage output from the first analog / digital converting means and the gain means to generate an N-bit output value, and subtracting a correction value stored in the memory from the generated N-bit output value. Means;;Therefore, according to the present invention, by implementing the two functions of the PGA and ADC at the same time, the area and power consumption can be minimized compared to the case of designing the two blocks independently, and the gain of the linear final output stage can be improved by correcting the gain error. It has an effect that can be obtained.