Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1995-06-06
1996-11-19
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
327551, 327100, 327165, 327167, 327334, 327335, 327336, 327307, 330306, 330 11, H03K 500
Patent
active
055766587
ABSTRACT:
There is disclosed a rectangular filter which has a simple configuration and is capable of producing an improved rectangular wave. An input step wave is differentiated by a differentiator circuit and amplified by a first amplifier. The output from the amplifier is inverted by an inverting amplifier having a gain of -1. The output from the first amplifier is integrated by an integrator circuit having a time constant equal to the time constant of the differentiator circuit. The output from the inverting amplifier and the output from the integrator circuit are summed up by an adding circuit. The input signal is faithfully reproduced at the output of the adding circuit. After a given time passes since the input signal has been applied, the capacitor of the integrator circuit is shorted out. In this way, a rectangular wave is obtained. There is also disclosed a filter amplifier comprising this rectangular filter and a gated integrator for integrating the output from the rectangular filter for a predetermined time.
REFERENCES:
patent: 4211981 (1980-07-01), Lerma
patent: 4481466 (1984-11-01), Roos et al.
patent: 4968898 (1990-11-01), Hushimi et al.
Husimi et al., "Trapezoidal Filtering of Signals Realized by the Directly Synthesized Gaussian Filter", IEEE Transactions on Nuclear Science, vol. 36, No. 1, Feb. 1989, pp. 396-399.
Hushimi Kazuo
Kuwata Masahiko
Callahan Timothy P.
JEOL Engineering Co. Ltd.
Jeol Ltd.
Le Dinh T.
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