Temperature sensor of pulse-width modulation
A temperature sensor, pulse width modulation technology, applied in thermometers, thermometers and instruments with directly sensitive electrical/magnetic components, etc., can solve the problems of poor measurement accuracy, large chip area, high power consumption, etc., to eliminate The effect of offset voltage on duty ratio and the effect of high precision
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[0019] The present invention will be further described in detail below with reference to the drawings and embodiments. Such as figure 1 As shown, the pulse width modulation temperature sensor of the present invention includes a band gap reference circuit 10 based on a standard CMOS process, a temperature detection circuit 20, and a pulse width modulation PWM oscillator circuit 30.
[0020] Band gap reference circuit 10 generates a band gap reference voltage V ref , And is the first current source I PTAT And the second current source I S Provide bias voltage. The temperature detection circuit 20 senses changes in temperature and generates a temperature detection voltage Vs that is proportional to the temperature. The pulse width modulation PWM oscillator circuit 30 modulates the duty cycle of the oscillator output pulse signal with the temperature detection voltage Vs, and generates a PWM signal whose duty cycle is proportional to the temperature and is output by the output termin...
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