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OSCILLATOR_OR_AMPLIFIER_WITH_WIDE_FREQUENCY_RANGE

2016-08-25 00:27  
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OSCILLATOR_OR_AMPLIFIER_WITH_WIDE_FREQUENCY_RANGE
An oscillator/amplifter is resistively tunable over a wide frequency range. Feedback circuits containing operational amplifiers, resistors, and capacitors synthesize the electrical effects of an inductance and capacitance in parallel between the input terminals. The synthetic inductance and capacitance, and, therefore, the resonant frequency of the input admittance, are adjusted by changing a potentiometer setting. The input signal is introduced in parallel to the noninverting input terminals of operational amplifiers A1 and A2 and to the potentiometer cursor. The voltages produced by the feedback circuits in response to input voltage V1 are indicated at the various circuit nodes.