Temperature sensor using ring oscillator and temperature detection method using the same
AssigneeSamsung Electronics Co., Ltd.
InventorsChan-Kyung Kim, Young-Hyun Jun
Life of this patent
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Abstract
Provided are a temperature sensor using a ring oscillator and temperature detection method using the same. One embodiment of the temperature sensor includes a first pulse generator, a second pulse generator, and a counter. The first pulse generator includes a first ring oscillator and generates a first clock signal having a variable period according to a change in temperature. The second pulse generator includes a second ring oscillator and generates a second clock signal having a fixed period. The counter counts a pulse width of the first clock signal as a function of a pulse width of the second clock signal and generates a temperature code.
Claims20
A temperature sensor, comprising:
- a first bias unit having a variable amount of an internal current that varies in response to temperature and generating first and second bias signals;
- a second bias unit having a fixed amount of an internal current and generating third and fourth bias signals;
- a first ring oscillator generating a first clock signal in response to the first and second bias signals;
- a second ring oscillator generating a second clock signal in response to the third and fourth bias signals;
- a one-shot pulse generator latching one pulse of the first clock signal and generating a one-shot pulse;
- and
- a temperature code generator counting a width of the one-shot pulse as a pulse of the second clock signal and generating a temperature code,
- wherein the first bias unit includes:
- a first PMOS transistor having a source connected to a power voltage, and having an interconnected gate and drain;
- a resistor connected between the drain of the first PMOS transistor and a ground voltage;
- a second PMOS transistor having a source connected to the power voltage and having a gate connected to the gate of the first PMOS transistor to generate the first bias signal;
- and
- an NMOS transistor having a gate and drain connected to a drain of the second PMOS transistor to generate the second bias signal, and having a source connected to the ground voltage.
A temperature sensor, comprising:
- a first bias unit having an amount of internal current that varies in response to temperature and generating first and second bias signals;
- a second bias unit having a fixed amount of an internal current and generating third and fourth bias signals;
- a first ring oscillator generating a first clock signal in response to the first and second bias signals;
- a second ring oscillator generating a second clock signal in response to the third and fourth bias signals;
- a first demultiplier demultiplying the first clock signal and generating a first demultiply signal;
- a first one-shot pulse generator latching one pulse of the first demultiply signal and generating a first shot pulse;
- a second demultiplier demultiplying the first demultiply signal and generating a second demultiply signal;
- a second one-shot pulse generator latching one pulse of the first demultiply signal and generating a second shot pulse;
- a pulse width controller inputting the first and second one-shot pulses and generating a pulse width window signal;
- and
- a temperature code generator counting a pulse width of the second clock signal as a function of a pulse width of the pulse width window signal and generating a temperature code.
A temperature detection method, comprising:
- generating a first clock signal having a period that varies in response to temperature;
- generating a second clock signal having a fixed period;
- demultiplying the first clock signal and generating a first demultiply signal;
- latching one pulse of the first demultiply signal and generating a first one-shot pulse;
- demultiplying the first demultiply signal and generating a second demultiply signal;
- latching one pulse of the first demultiply signal and generating a second one-shot pulse;
- inputting the first and second one-shot pulses and generating a pulse width window signal;
- and
- counting a pulse width of the pulse width window signal as a function of a pulse width of the second clock signal and generating a temperature code.
Dependencies are inferred from the claim text.