The automatically calibrating op-amp system of claim 2, wherein the DAC comprises: a plurality of bit signal inputs configured to receive the successive plurality of bit signals and a calibration output configured to provide the analog calibration signal to one auxiliary input of the auxiliary differential input pair.Ĥ. The automatically calibrating op-amp system of claim 1, wherein the SAR controller comprises: a voltage compare input configured to receive the op-amp output voltage signal and a plurality of bit signal outputs configured to provide the successive plurality of bit signals to the DAC.ģ. An automatically calibrating operational amplifier (op-amp) system, comprising: an op-amp, comprising: a primary differential input pair, an auxiliary differential input pair, and an output the op-amp configured to generate an op-amp output voltage signal on the output based on a voltage differential of the primary differential input pair and a voltage differential of the auxiliary differential input pair and an automatic calibration circuit configured to: electrically couple the primary differential input pair in response to a mode signal indicating a calibration mode and electrically decouple the primary differential input pair in response to the mode signal indicating an amplify mode the automatic calibration circuit comprising: a successive approximation register (SAR) controller configured to successively generate a plurality of bit signals in response to the mode signal indicating the calibration mode, wherein a value of each successive plurality of bit signals is based on the op-amp output voltage signal and a digital-to-analog converter (DAC), configured to: convert each successive plurality of bit signals into an analog calibration signal based on a reference voltage in response to the mode signal indicating the calibration mode and provide the analog calibration signal to one auxiliary input of the auxiliary differential input pair, wherein another input of the auxiliary differential input pair is configured to be driven by a voltage based on the reference voltage such that the analog calibration signal compensates for a composite offset voltage of the op-amp in response to the mode signal indicating the amplify mode.Ģ. The analog calibration signal is provided to an auxiliary differential input of the op-amp to compensate for the composite offset voltage in the amplify mode.ġ.
The automatic calibration circuit includes a digital-to-analog converter (DAC) configured to convert each successive digital value into the analog calibration signal in response to the mode signal indicating the calibration mode. An automatic calibration circuit is included that employs a successive approximation register (SAR) controller configured to successively generate digital values based on the output voltage signal of the op-amp in response to a mode signal indicating the calibration mode.
In one aspect, an automatically calibrating op-amp system is provided that employs an analog calibration signal corresponding to a calibration mode to compensate an output voltage signal of an op-amp corresponding to an amplify mode. Automatically calibrating operational amplifier (op-amp) systems for mitigating effects of offset voltages are disclosed.
0 kommentar(er)
