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Magnetic Bubble Local Oscillator

IP.com Disclosure Number: IPCOM000082191D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

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Four T-bars 10 can be used in conjunction with sensors 12 to produce an oscillatory waveform.

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Magnetic Bubble Local Oscillator

Four T-bars 10 can be used in conjunction with sensors 12 to produce an oscillatory waveform.

The magnetic bubble 14 moves from one of the T-bars 10 to the other under the influence of the rotating magnetic field 16. As it moves, it passes the magnetoresistive sensors 12 causing them to change their resistive values. Magnetoresistive sensors 12 can be arranged in a bridge circuit to produce a number of different waveforms. For instance, if the sensors 12a are placed in the upper left leg 18 of the bridge, while all the other legs of the bridge are fixed resistors, the output from the sense amplifier 20 will be a periodic pulse.

If the sensors 12d are then substituted for the fixed resistors in leg 24, a square wave of bilevel signal with a 50% duty cycle will be produced. Alternatively, if the sensors 12d are placed in leg 22 instead of leg 20 they, in combination with the sensors 12a and leg 18, would produce a trilevel signal which is positive one-third of the time, negative the other third and zero between the positive and negative pulses.


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