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Robert Schell

Rpbert Schell is a graudate student with the Department of Electrical Engineering and Computer Science at the Catholic University of America, Washington, D.C.


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Author Articles

  • Make A Frequency Mixer With Op Amps

    By Robert Schell, February 02, 2006

    Frequency mixers are often implemented using a diode bridge or a Gilbert cell. Both types of mixers use a local oscillator (LO) to flip the polarity of the radio-frequency (RF) input. When the LO is positive, the RF input passes to the intermediate-frequ

  • Counte Resets LRS Generator

    By Robert Schell, September 30, 2002

    A linear-recursive-sequence (LRS) generator produces binary sequences using a shift register and feedback through an exclusive-OR gate. The sequence length equals 2N­1, where N represents the number of registers. The generator cycles...