The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 2000
Filed:
Nov. 18, 1998
Axel Kattner, Seevetal, DE;
Holger Gehrt, Rosengarten, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
To achieve a constant control range in an integrator-filter circuit for filtering a push-pull signal, having at least two integrator elements (1) this second control current being having resistors (11, 12) arranged at its inputs, a subsequent current multiplier (13) having two signal inputs (14, 15) and preceding a push-pull amplifier (18) with an inverting input (20) and a non-inverting input (19), having inverting output (21) fed back to the non-inverting input (19) and a non-inverting output (23) fed back to the inverting input (20) via capacitances (22, 24), the current multiplier (13) receiving, at two control inputs (37, 38), a first and a second control current (I.sub.1, I.sub.2) for adjusting the integration time constant of the integrator element (1) is adjustable and from which the second control current (I.sub.2) flows in substantially two halves through the signal inputs (14, 15) of the current multiplier (13), an associated third control current (I.sub.3) is generated which, in dependence upon a second control voltage (U.sub.2) is generated, at whose variation the third control current (I.sub.3) varies proportionally to the second control current (I.sub.2). An associated compensation circuit (2) is provided for each integrator element (1).