Apparatus for converting an AC component of a signal to a square

Details Apparatus for converting an AC component of a signal to a square Apparatus for converting an AC component of a signal to a square

1991-01-18

1994-05-24

Ng, Jin F.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

328 1, 307261, 307359, H03K 500, H03K 5153, H03K 508

Patent

active

053152603

ABSTRACT:
An output signal of a magnetoelectrical transducer of a capstan DC motor used in a magnetic tape recorder includes a DC offset voltage. The output signal of the transducer is coupled to a non-inverting input of a first operational amplifier. The output signal is also coupled to an inverting input of a second operational amplifier, operating as a comparator. The non-inverting input of the second operational amplifier is coupled to an output terminal of the first operational amplifier that amplifies an AC voltage component of the transducer output signal. By means of two anti-parallel coupled diodes in a negative feedback branch of the first operational amplifier, a DC amplification of unity is obtained as soon as a first peak of the output signal of the transducer is reached.

REFERENCES:
patent: 3836791 (1974-09-01), Galloway
patent: 3852673 (1974-12-01), Guyot et al.
patent: 4682049 (1987-07-01), Kirschner et al.
patent: 4686385 (1987-08-01), Sharpe
patent: 4866298 (1989-09-01), Kniss et al.
patent: 4868909 (1989-09-01), Lowel
patent: 4922126 (1990-05-01), Lowel
patent: 5015879 (1991-05-01), Lasagna et al.

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