A Novel Parametric Negative Resistance Effect in Josephson Junctions.
Rept. for 1 Jan 73-30 Jun 73,
AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS
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The negative resistance effect recently predicted for current controlled highly damped Josephson junctions is experimentally demonstrated at a frequency of 9 GHz. Characteristically, the pump or Josephson frequency is smaller than the amplified one and the pump mechanism is effective over a broad range of frequencies in contrast to the conventional parametric negative resistance effect where the pump frequency exceeds that of signal and idler and where the frequency of operation is limited to a narrow range. The braodband feature renders operation uncritical to tuning and bias voltage fluctuations. The fact that the junction is the element of lowest impedance in the circuit alleviates to a degree the matching problem generally encountered with Josephson contacts. Author
- Solid State Physics