Readout method, readout circuit and sensing apparatus with wide dynamic range
地域：
Hsinchu
摘要
A readout circuit that includes an amplifier circuitry, an analog-to-digital converter, a feedback circuit and a control logic is introduced. The amplifier circuitry may receive and amplify a differential signal that is obtained according to an input signal and a feedback signal to generate an amplified signal. The analog-to-digital converter is configured to convert the amplified signal to generate a n-bit digital code, wherein n is a positive integer. The feedback circuit is configured to search and generate a m-bit digital code based on a value of the n-bit digital code and convert the m-bit digital code to generate the feedback signal, wherein m is a positive integer. The control logic is coupled to the analog-to-digital converter and the feedback circuit, and configured to control the analog-to-digital converter and the feedback circuit. A multi-bit digital output of the readout circuit is generated according to the n-bit digital code and the m-bit digital code.
說明書
In some embodiments, the ADC 230 may be or may include a 6-bit ADC that is configured to generate the 6-bit digital code; and the feedback circuit 250 may generate the 11-bit digital code D_MSB. As such, the readout circuit 200 may generate a 17-bit digital output DOUT based on the 11-bit digital code D_MSB and the 6-bit digital code D_LSB. It is noted that a single ADC or DAC with the resolution of 17 bits is much bigger in size, much more complicated and much slower than a combination of moderate ADC and DAC (e.g., 6-bit ADC and 11-bit DAC). As such, the readout circuit 200 that uses simple and moderate resolution ADC and DAC may achieve a wide dynamic range while achieving fast operation and occupying small layout area.
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