Generator of periodial signals, in particular for switch-mode power supplies
AssigneeSGS-Thomson Microelectronics S.A.
InventorsMauro Merlo, Silvano Coccetti
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Abstract
This generator of periodic signals with exponential edges, which may be integrated at low cost, comprises a current source circuit connected to a capacitor and to a resistive element to supply them with currents having mutually correlated amplitudes, an amplifier interposed between the capacitor and the resistive element and adapted to maintain the voltage drop on the resistive element proportional to the voltage drop on the capacitor, and a switch device, connected in parallel to the capacitor and periodically switched off to allow the discharge of the capacitor.
Claims6
A generator of periodic signals, in particular for switch-mode power supplies, comprising a capacitive element generating a capacitor voltage drop thereon, a resistive element generating a resistor voltage drop thereon, current source means connected to said capacitive element and to said resistive element and supplying them with currents having mutually proportional amplitudes, amplifier means, interposed between said capacitive element and said resistive element for maintaining the resistor voltage drop proportional to the capacitor voltage drop and a switch device, connected in parallel to said capacitive element, said switch device being periodically switched off for allowing discharge of said capacitive element therethrough.
Dependencies are inferred from the claim text.