Current controlled oscillator
AssigneeNXP B.V.
InventorsSiamak Delshadpour, Chiahung Su
Life of this patent
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Abstract
A temperature compensated current controlled oscillator (CCO) including a first current generator configured to produce a proportional to absolute temperature (PTAT) current based upon a trim signal, a second current generator configured to produce a complementary to absolute temperature (CTAT) current based upon a temperature measurement, and a ring oscillator configured to receive the PTAT current and the CTAT current and to produce a frequency signal based upon the PTAT current and the CTAT current.
Claims14
A temperature compensated current controlled oscillator (CCO), the CCO comprising:
- a first current generator configured to produce a proportional to absolute temperature (PTAT) current based upon a trim signal;
- a temperature sensor configured to produce a temperature measurement;
- a second current generator configured to produce a complementary to absolute temperature (CTAT) current based upon the temperature measurement, wherein the CTAT current is only produced when the temperature measurement is above Tts and Tts is selected based on a simulation or other circuit analysis to achieve an optimized point;
- and
- a ring oscillator configured to receive the PTAT current and the CTAT current and to produce a frequency signal based upon the PTAT current and the CTAT current, wherein the PTAT current and the CTAT current are based upon different numbers of bits.
A method of producing a frequency signal using a temperature compensated current controlled oscillator (CCO), the method comprising:
- producing, by a first current generator, a proportional to absolute temperature (PTAT) current based upon a trim signal;
- producing, by a temperature sensor, a temperature measurement;
- producing, by a second current generator, a complementary to absolute temperature (CTAT) current based upon a temperature measurement, wherein the CTAT current is only produced when the temperature measurement is above Tts and Tts is selected based on a simulation or other circuit analysis to achieve an optimized point;
- receiving, by a ring oscillator, the PTAT current and the CTAT current, wherein the PTAT current and the CTAT current are based upon different numbers of bits;
- and
- producing, by the ring oscillator, a frequency signal based upon the PTAT current and the CTAT current.
Dependencies are inferred from the claim text.