These magazine articles are in Acrobat .pdf format:New Topology Multiplier Generates Odd Harmonics This circuit uses four diodes to make odd-order frequency multipliers. Low Frequency Circulator/Isolator Uses No Ferrite or Magnet This circuit employs fast op-amps to synthesize the function of a magnetic circulator or isolator. New Oscillators Reach for Lower Noise This article describes a new line of oscillators. (New at the time, anyway.) A Low Power RF ID Transponder This transponder uses patch antennas and a couple of diodes for the RF portion and a cheap microprocessor or other low-power modulator for the data. Constant Reactance Voltage Controlled Oscillator This "crvco" oscillator achieves very wide tuning range by saturating the inductor with a magnetic field, in addition to tuning a varactor.
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