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Wien_bridge_oscillator_with_automatic_trim

2016-05-19 04:12  
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Wien_bridge_oscillator_with_automatic_trim
Figure 4-38 shows another version of the Fig. 4-34 circuit, but with automatic trim for distortion. Q1 is replaced with an optically driven CdS photocell, and the LT1055 is replaced with a ground-sensing op amp operating in the single-supply mode. Distortion improves slightly to 0.0015%. LINEAR TECHNQLOGY, APPLICATION NOTE 43, P. 33.