Patent ID: 6020792
Filing Date: 2000-02-01
Classification: H03K

Abstract:
A precision relaxation oscillator with temperature compensation circuit, said oscillator comprising:a first current generator having an output;a second current generator having an output; andan oscillation generator coupled to said outputs of said first and said second current generators in order to receive current therefrom, wherein said oscillation generator comprises:at least one capacitor coupled to the outputs of said first and second current generators for being charged by said current generators;a reference voltage circuit generating a reference voltage;a comparator circuit coupled to said at least one capacitor and to said reference voltage circuit, said comparator circuit being arranged to compare the voltage across said at least one capacitor with said reference voltage;a flip-flop controlled by said comparator circuit;at least one inverter driven by said flip-flop; anda switch circuit controlled by said flip-flop and by said at least one inverter; said switch circuit being coupled to said at least one capacitor and to said first and said second current generators for charging and discharging said at least one capacitor according to the control by said flip-flop and by said at least one inverter;wherein said first current generator is coupled to said reference voltage circuit to enable said first current generator to control the effects of reference voltage drift and wherein said oscillator is implemented on a single integrated circuit.