Temperature sensing circuit for low voltage operation

Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor

Reexamination Certificate

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Details

C327S512000

Reexamination Certificate

active

07980759

ABSTRACT:
The present invention discloses a temperature sensing circuit which is adaptive toward low voltage IC environment, it mainly comprises: a temperature sensing unit, a temperature threshold control unit and a transconductance amplifier. The temperature sensing unit includes a bipolar transistor and PMOS transistors, and senses temperature via detecting voltage. The temperature threshold control unit includes PMOS transistors and NMOS transistors, and makes an over-temperature alert signal persistently sent out until temperature is lowered to a specified value when the temperature sensing unit detects an over-temperature state. The transconductance amplifier includes PMOS transistors and NMOS transistors, and makes the temperature sensing circuit of the present invention adapt to a low voltage IC environment. Further, the circuit architecture of the present invention does not require any use of operational amplifier or band-gap voltage reference source. Therefore, the present invention can reduce the production and design cost.

REFERENCES:
patent: 6489831 (2002-12-01), Matranga et al.
patent: 7230472 (2007-06-01), Scheuerlein et al.
patent: 7417487 (2008-08-01), Mori
patent: 2008/0291969 (2008-11-01), Chu
patent: 2010/0008398 (2010-01-01), Nojima
patent: 2010/0054302 (2010-03-01), Anzai
patent: 2011/0025666 (2011-02-01), Baek et al.

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