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本文提出了一种斩波运算放大器，实现了5.9nV/√Hz的低噪声、0.78µV的最大偏移和28.3nV/°C的偏移漂移。通过优化输入跨导和采用斩波技术，有效降低了基带噪声和直流误差。
offset and low-offset drift. The resulting baseband noise can also be a significant error source, and thus reducing the total error down to sub µV levels at DC and low frequencies has been targeted. Chopping is more suitable to lower the baseband noise PSD, as it is primarily determined by the broad-band thermal noise floor and not aliased by the high frequency noise [1]. Reducing the thermal noise floor requires higher value of input transconductance [1]. Consequently, more capacitance or higher output transconductance is required to stabilize the overall feedback loop with regular Miller compensation. A 6.5nV/√Hz conditionally stable chopper operational amplifier has been reported, using multi-pole feedforward compensation techniques [2]. Unconditionally stable chopper operational amplifiers presented so far exhibit more than 10nV/√Hz noise PSD [1,3-5]. This paper reports a 5.9nV/√Hz unconditionally stable chopper operational amplifier
Analog Devices, Wilmington, MA, Many auto-zero or chopper operational amplifiers have been reported with low