1.

The circuit shown in the figure has an ideal Op-Amp. The oscillation frequency and the condition to sustain the oscillations, respectively, are

A. \(\frac{1}{{{\rm{CR}}}}\) and \({{\rm{R}}_1} = {{\rm{R}}_2}\)
B. \(\frac{1}{{{\rm{CR}}}}\)and \({{\rm{R}}_1} = 4{{\rm{R}}_2}\)
C. \(\frac{1}{{2{\rm{CR}}}}\) and \({{\rm{R}}_1} = {{\rm{R}}_2}\)
D. \(\frac{1}{{2{\rm{CR}}}}\) and \({{\rm{R}}_1} = 4{{\rm{R}}_2}\)
Answer» E.


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