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:
Mar. 17, 1987
Filed:
May. 02, 1984
Wouter Smeulers, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit for generating a triangular voltage (V.sub.c) across a capacitor (C) having a charging current source (1, 2) and a discharging current source (3, 4) for the capacitor (C). A comparison stage (11, 12, 13, 14) compares the generated voltage (V.sub.c) with a first and a second reference voltage, respectively, from a voltage divider (17, 18, 19) and controls the generation of a setting and a resetting signal, respectively, at a bistable switching element (20, 21) when the value of the first and the second reference voltage, respectively, is reached. The bistable element (20, 21) controls a switch (7, 8) which determines charging or discharging, respectively, of the capacitor (C). The circuit is suitable for high repetition rates because of the fact that a buffer stage (28) is connected to the capacitor (C) for deriving, under the control of the capacitor voltage (V.sub.c), a supply voltage for the bistable switching element (20, 21) which is of the same order of magnitude and varies in the same direction as the generated triangular voltage. Preferably, the switch (1, 8) and the bistable switching element (20, 21) do not employ pnp-transistors.