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:
May. 07, 1985
Filed:
Jul. 06, 1983
Robert Boudault, Limours, FR;
Abstract
A modulator transmitting an analog data signal by variation of the frequency of an oscillator comprising an integrator (1, 2) and a bistable circuit with trigger hysteresis (8 to 13). The two-level voltage from the bistable circuit, taken to a terminal of a resistor network (6, 7, 30) connected to the input of the integrator, is formed from the potential O and the potential kU, which is lower than the supply voltage U, applied respectively to the inputs of two analog switches (12, 13) whose outputs are connected to the output of the bistable circuit. The data signal v.sub.e is applied to the input of a conversion circuit (17) arranged to supply voltages v.sub.e1 and v.sub.e2 varying linearly as a function of v.sub.e and symmetrically with respect to kU/2 and applied respectively to the inputs of two further analog switches (26, 27) whose outputs are connected to another terminal in the resistor network. The input and output signals of the inverter (9) of the bistable circuit are used to control the switches.