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The paper presents a 24 V chopper offset-stabilized operational amplifier with symmetrical RC notch filters, having a 4–24 V supply range, and being realized using a 0.25 ßm BCD process. The amplifier has a typical offset voltage of 1.2 μV, a minimum PSRR of 128 dB, a minimum CMRR of 120 dB, a minimum open-loop gain of 134dB, a noise PSD of 30 nV/√Hz, 1.8 MHz unity gain bandwidth, and THD + noise...
The paper presents three approaches for frequency compensation in chopper offset-stabilized amplifiers with symmetrical passive RC notch filter with two cutoff frequencies. The filter has two cutoff frequencies: the chopping frequency itself and the fifth harmonic of the chopping frequency. The frequency compensation network is connected either at the input of the notch filter, or at its output, or...
The paper presents a symmetrical passive RC notch filter with two cutoff frequencies used for ripple reduction in chopper offset-stabilized amplifiers. The filter has two cutoff frequencies: the first one is the chopping frequency itself, while the second one is the third harmonic. The rejection of the proposed filter is 60 dB around the cutoff frequencies. The chopping frequency is correlated with...
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