Operational amplifier circuit and reference voltage generating circuit module
A technology of operational amplifiers and reference voltages, applied in differential amplifiers, DC-coupled DC amplifiers, instruments, etc., can solve problems such as increased deviation and increased dispersion of reference voltages, and achieve low power consumption, reduced dispersion, and small area The effect of spending
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[0021] see figure 1 , and combined with figure 2 , 3 As shown, the reference voltage generation circuit module in the following embodiments includes: a reference voltage generation circuit, an operational amplifier circuit, and a low-pass filter circuit. The operational amplifier circuit includes an operational amplifier and a chopping detuning circuit.
[0022] The influence of the offset voltage of the operational amplifier on the reference voltage Vref can be derived from the transfer function.
[0023] When the offset voltage is not considered, then there is
[0024] Vref = R 3 R 1 V T ln n + R 2 R 1 V BE .
[0025] When taking into account the offse...
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