Device for generation of a reference frequency and corresponding electronic circuit
View Patent ↗A device for generation of a reference frequency includes a component configured for generating a reference voltage, and a slaving circuit configured for slaving the reference frequency to the reference voltage.
1. A device for generation of a reference frequency comprising:
a component configured to generate a reference voltage; and
a slaving circuit configured for slaving said reference frequency to said reference voltage and comprising:
a frequency-voltage converter having a transfer function that is independent of variations in operating conditions of said device and being configured for converting said reference frequency to a voltage and outputting an image voltage of said reference frequency.
2. The device for generation of a reference frequency according to claim 1 , wherein said slaving circuit also comprises a comparator configured for comparing said image voltage with said reference voltage, and a voltage-controlled oscillator configured for outputting said reference frequency as a function of an output signal from said comparator.
3. The device for generation of a reference frequency according to claim 2 , wherein said converter comprises a charging circuit configured for charging at least one capacitor outputting an intermediate voltage, and a smoothing component configured for smoothing said intermediate voltage outputting said image voltage.
4. The device for generation of a reference frequency according to claim 3 , wherein said charging circuit comprises:
a resistor powered by a power supply voltage and connected to the input to said smoothing component;
a capacitor and a switch in parallel, connected between the ground and the input to said smoothing component, said switch being controlled by a switching signal at said reference frequency.
5. The device for generation of a reference frequency according to claim 3 , wherein said charging circuit comprises:
a switched capacitor powered by a power supply voltage and connected to the input to said smoothing component, said switched capacitor comprising at least one switch controlled by a switching signal at the reference frequency; and
a capacitor and a switch in parallel, connected between the ground and the input to said smoothing component, said switch being controlled by said switching signal.
6. The device for generation of a reference frequency according to 5 , wherein said component configured for generating a reference voltage includes a Bandgap type generator.
7. The device for generation of a reference frequency according to claim 6 , a further comprising a programming device configured for programming said component for generating a reference voltage and/or a programming device configured for programming said converter for converting said reference frequency into a voltage, in order to adjust said reference frequency.
8. The device for generation of a reference frequency according to claim 1 , wherein said converter comprises a charging circuit configured for charging at least one capacitor outputting an intermediate voltage, and a smoothing component configured for smoothing said intermediate voltage outputting said image voltage.
9. The device for generation of a reference frequency according to claim 8 , wherein said charging circuit comprises:
a resistor powered by a power supply voltage and connected to the input to said smoothing component;
a capacitor and a switch in parallel, connected between the ground and the input to said smoothing component, said switch being controlled by a switching signal at said reference frequency.
10. The device for generation of a reference frequency according to claim 8 , wherein said charging circuit comprises:
a switched capacitor powered by a power supply voltage and connected to the input to said smoothing component, said switched capacitor comprising at least one switch controlled by a switching signal at the reference frequency; and
a capacitor and a switch in parallel, connected between the ground and the input to said smoothing component, said switch being controlled by said switching signal.
11. The device for generation of a reference frequency according to claim 2 , wherein said converter comprises a charging circuit configured for charging at least one capacitor outputting an intermediate voltage, and a smoothing component configured for smoothing said intermediate voltage outputting said image voltage.
12. The device for generation of a reference frequency according to 1 , wherein said component configured for generating a reference voltage includes a Bandgap type generator.
13. The device for generation of a reference frequency according to claim 1 , a further comprising a programming device configured for programming said component for generating a reference voltage and/or a programming device configured for programming said converter for converting said reference frequency into a voltage, in order to adjust said reference frequency.
14. An electronic circuit comprising a device for generation of a reference frequency according to claim 1 .
15. An electronic circuit comprising a device for generation of a reference frequency according to claim 7 .
16. A device for generation of a reference frequency comprising:
a component configured to generate a reference voltage; and
a slaving circuit configured for slaving said reference frequency to said reference voltage and comprising:
a converter configured for converting said reference frequency to a voltage, and outputting an image voltage of said reference frequency, wherein the converter comprises a charging circuit configured for charging at least one capacitor outputting an intermediate voltage, and a smoothing component configured for smoothing said intermediate voltage to output said image voltage; and
a comparator configured for comparing said image voltage with said reference voltage, and a voltage-controlled oscillator configured for outputting said reference frequency as a function of an output signal from said comparator.
17. A device for generation of a reference frequency comprising:
a component configured to generate a reference voltage;
a slaving circuit configured for slaving said reference frequency to said reference voltage and comprising:
a converter configured for converting said reference frequency to a voltage, and outputting an image voltage of said reference frequency; and
at least one of a programming device configured for programming said component for generating a reference voltage, or a programming device configured for programming said converter for converting said reference frequency into a voltage, in order to adjust said reference frequency.