Isolation amplifier

Details Isolation amplifier Isolation amplifier

1977-09-16

1978-11-07

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330166, 330170, 330171, H03F 338

Patent

active

041248228

ABSTRACT:
A DC isolation amplifier having improved conductive isolation between its input and output. The amplifier includes an input section having a modulator and an output section having a demodulator and an oscillator section. The modulator and demodulator are nonconductively coupled through inductive loops of two closed-loop cores of magnetic material each having windings inductively coupled to the material of their associated core and to the other of the modulator or the demodulator. Additionally, a unitary closed loop winding couples the two cores such that the net EMF induced in the turns of the winding accordingly such that the respective component of the external magnetic field of the turns is substantially normal to the respective plane of each turn of this plurality. Additionally, this unitary loop is twisted between the cores to comprise a twisted pair additionally to minimize the effects from external magnetic fields. In the preferred embodiment, this loop is limited to two turns per core. However, this number may be increased slightly for certain specific situations. In preferred embodiments, the cores are housed in magnetic shields, the shields having an opening in one end and the center line of the core is disposed in the plane of the opening of the shield.

REFERENCES:
patent: 3946324 (1976-03-01), Smith

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