| CPC H03M 1/0617 (2013.01) [H03M 1/1023 (2013.01); H03M 1/185 (2013.01)] | 12 Claims |
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1. A signal gain tuning circuit having adaptive mechanism comprising:
an amplifier comprising an input interface and an output interface and configured to, according to an analog signal received from the input interface, generate a tuned analog signal at the output interface to an analog-to-digital conversion circuit;
a gain control capacitor array electrically coupled between the input interface and the output interface and configured to determine a gain of the tuned analog signal relative to the analog signal together with the amplifier;
a control circuit configured to receive an actual level of an output digital signal of the analog-to-digital conversion circuit under an operation mode, to determine an offset between the actual level and an estimated level to further generate a tuning control signal according to the offset;
a coarse-tuning capacitor array comprising a plurality of coarse-tuning capacitors coupled in parallel to the gain control capacitor array, each of the coarse-tuning capacitors having a first tuning amount relative to a maximum gain of the gain; and
a fine-tuning capacitor array comprising a plurality of fine-tuning capacitors coupled in parallel to the gain control capacitor array, each of the fine-tuning capacitors having a second tuning amount relative to the maximum gain, wherein the second tuning amount is smaller than the first tuning amount;
wherein a tuning capacitor enabling combination of the coarse-tuning capacitor array and the fine-tuning capacitor array are determined according to the tuning control signal to tune the gain and lower the offset.
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