Temperature measuring device

An apparatus comprising:

• an IPTAT generator configured to generate a current for a band gap reference voltage, the IPTAT generator comprising a first MOS transistor, a MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a first transistor, a second resistor, a first capacitor, a first bipolar transistor, a second bipolar transistor and an operational amplifier;
• a voltage forwarder configured to generate an analogous temperature voltage corresponding to a mirror current of the IPTAT, the voltage generator comprising a seventh MOS transistor, a third resistor and a fourth resistor;
• and
• an analog/digital converter configured to convert the analogous temperature voltage into a digitized temperature voltage.

An apparatus comprising:

• an IPTAT generator configured to generate a current for a band gap reference voltage, the IPTAT generator comprising a first MOS transistor, a MOS transistor, a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a first transistor, a second resistor, a first capacitor, a first bipolar transistor, a second bipolar transistor and an operational amplifier;
• a voltage forwarder configured to generate an analogous temperature voltage corresponding to a mirror current of the IPTAT, the voltage generator comprising a seventh MOS transistor, a third resistor and a fourth resistor;
• and
• an analog/digital converter configured to convert the analogous temperature voltage into a digitized temperature voltage, the analog/digital converter comprising an SAR logic unit, a digital/analog converter, a comparator, 2n resistors and a switching box.