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:
Aug. 01, 1989
Filed:
Sep. 08, 1987
Johannes O Voorman, Eindhoven, NL;
Pieter J Snijder, Eindhoven, NL;
Johannes S Vromans, Eindhoven, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
A third-order all-pass network for a delay circuit is formed by four coupled transconductors (G.sub.10 to G.sub.13) which are each represented by two transistors whose bases constitute the inputs and whose collectors constitute the outputs of the transconductor. A first input of these transconductors (G.sub.10 to G.sub.13) is connected to ground (3). Between the second inputs (25,26) of the first transconductor (G.sub.10) and the second transconductor (G.sub.11) a first capacitor (C.sub.1) is arranged, while between the second imputs (26,27) of the second transconductor (G.sub.11) and the third transconductor (G.sub.12) a second capacitor (C2) is arranged, and between the second inputs (27,28) of the third transconductor (G.sub.12) and the fourth transconductor (G.sub.13) a third capacitor (C3) is arranged. Further, a fourth capacitor (C4) is arranged between the second inputs (25,27) of the first transconductor (G.sub.10) and the third transconductor (G.sub.12), a fifth capacitor (C5) is arranged between the second inputs (26,28) of the second transconductor (G.sub.11) and the fourth transconductor (G.sub.13), and a sixth capacitor (C6) is arranged between the second inputs (25,28) of the first transconductor (G.sub.10) and the fourth transconductor (G.sub.13). The third (C3), fourth (C4) and sixth (C6) capacitors reduce resonance tendencies of the circuit and consequent resonant rise symptoms as a result of parasitic effects.