By direct synthesis of a trigonometric identity, this circuit generates an output signal frequency that is three times the input signal frequency. Frequency-doubling with free 90° phase shifter is embedded in the same circuitry. Simulation results demonstrate the functionality and the performance of the circuit.
References
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W. Surakampontorn
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_20020311
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