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公开(公告)号:US11018625B1
公开(公告)日:2021-05-25
申请号:US16804245
申请日:2020-02-28
申请人: NXP B.V.
发明人: Alexander Sebastian Delke , Mark Stefan Oude Alink , Anne Johan Annema , Yanyu Jin , Jos Verlinden , Bram Nauta
摘要: A frequency reference generator includes (i) an integrated frequency source having drive circuitry that drives a resonant (e.g., non-trimmable LC) tank to generate an oscillator signal, (ii) at least one temperature sensor that generates at least one measured temperature signal, and (iii) a frequency-adjustment circuit that adjusts the oscillator signal frequency to generate the frequency reference based on the measured temperature signal and a (e.g., sample-specific) mapping from temperature to a corresponding frequency-adjustment parameter (e.g., a divisor value for a fractional frequency divider). In some embodiments, a Colpitts oscillator generates the oscillator signal based on the measured temperature signal, where the Colpitts oscillator has voltage/temperature-compensation circuitry that compensates for variations in power supply voltage and operating temperature. Such frequency reference generators achieve substantial PVT insensitivity with as little as a single 1T-trim or even no trim at all.
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公开(公告)号:US20230134106A1
公开(公告)日:2023-05-04
申请号:US18049029
申请日:2022-10-24
申请人: NXP B.V.
IPC分类号: G01K1/022
摘要: A temperature sensor and method of temperature sensing is described. A first reference current is provided to a dual-slope ADC during a first slope time duration of a dual-slope ADC conversion cycle. A second reference current is provided to the dual-slope ADC during a second slope time duration of the dual-slope ADC conversion cycle. A digital codeword corresponding to a ratio of the first and second reference currents is then output by the dual-slope ADC. The first and second reference current ratio is related to the temperature.
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