Title: Attenuation equalizer for correcting a temperature and frequency-dependent cable attenuation

Abstract: Attenuation equalizer for correcting within a frequency range the temperature and frequency-depending attenuation variation of cables, comprising a cascade arrangement of a fixed and a variable attenuation correction circuit, connected to a control circuit, the variable attenuation correction circuit comprising a bridge-T network having a series arrangement, of two identical series resistors bridged by a variable bridging impedance and a parallel impedance connected between these two series resistors, the fixed attenuation correction circuit having a lower attenuation for higher frequencies than for lower frequencies, the temperature dependency of the cable being eliminated in the variable attenuation correction circuit and the frequency dependence being eliminated mainly in the fixed attenuation correction circuit for which purpose the variable attenuation correction circuit comprises only two adjustable components.

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Inventors: van der Meijs, Antonius A. E. J. (Breda, NL)

Application Number: 914853
Filing Date: 1978-06-12
Publication_date: 1980-06-17
Assignee: U.S. Philips Corporation (New York, NY)
Primary Class(es): 333/18 178/63E, 333/28R
Other Classes:
US Patent Ref:

2777994	Jan, 1957	Hurault	333/28.
3441879	Apr, 1969	Tomcavage	333/28.
3569869	Mar, 1971	Sutto, Jr. et al.	333/28.
3854659	Dec, 1974	Bucherl et al.	333/28.

Other Refs: 2453609

May, 1975	DE

Primary Examiner: Gensler, Paul L.
Assistant Examiner:
Attorney: Briody; Thomas A., Streeter; William J., Cohen; Simon L.