Permanent switchable parametric device bias

Claim 1

A PHASE LOCKED PARAMETRIC OSCILLATOR COMPRISING A FIRST BISTABLE MAGNETIC FILM HAVING AN EASY MAGNETIZATION AXIS AND AN OSCILLATABLE MAGNETIZATION VECTOR NORMALLY STABLE SUBSTANTIALLY ALONG SAID AXIS IN EITHER OF TWO OPPOSITE DIRECTIONS TO REPRESENT TWO RESPECTIVE STABLE STATES, A SECOND BISTABLE MAGNETIC FILM DISPOSED BIASINGLY ADJACENT SAID FIRST FILM AND HAVING AN EASY MAGNETIZATION AXIS SUBSTANTIALLY PARALLEL TO THE AXIS OF SAID FIRST FILM AND AN EFFECTIVE MAGNETIZATION VECTOR RESTING SUBSTANTIALLY ALONG THE SAID SECOND FILM''S MAGNETIZATION AXIS IN A GIVEN ONE OF ITS OPPOSITE DIRECTIONS AND SWITCHABLE THEREBETWEEN FOR BIASING THE SAID FIRST FILM''S MAGNETIZATION VECTOR TOWARD ONE OR THE OTHER OF ITS SAID TWO DIRECTIONS, A TANK CIRCUIT INCLUDING AN OUTPUT LINE COUPLED TO SAID FIRST FILM, AND MEANS FOR CAUSING OSCILLATIONS IN SAID TANK CIRCUIT INCLUDING MEANS FOR SELECTIVELY COUPLING TO SAID TANK CIRCUIT FIRST OR SECOND CONTROL SIGNALS WHICH ARE 180* OUT OF PHASE WITH EACH OTHER FOR CAUSING THE OSCILLATIONS IN THE TANK CIRCUIT TO BE IN PHASE WITH THE SELECTED ONE OF SAID CONTROL SIGNALS WHEN SAID SECOND FILM BIASES THE MAGNETIZATION VECTOR OF SAID FIRST FILM TOWARDS A GIVEN ONE OF ITS SAID TWO DIRECTIONS OR, WHEN THE FIRST FILM''S MAGNETIZATION VECTOR IS BIASED BY THE SECOND FILM TOWARD THE OTHER OF ITS SAID TWO DIRECTIONS, TO BE OUT OF PHASE WITH THE SELECTED CONTROL SIGNAL BY SUBSTANTIALLY 90* IN THE SAME DIRECTION REGARDLESS OF WHICH OF THE FIRST OR SECOND CONTROL SIGNALS IS SELECTED, WHEREBY SAID TANK CIRCUIT OSCILLATIONS CAN BE IN ANY ONE OF FOUR DIFFERENT PHASES SUBSTANTIALLY 90* APART.