Patent ID: 11867571
Assignee: NXP B.V.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 0:
1. A temperature detection device, comprising:
a reference voltage generator configured to generate a reference voltage VREF;
a current conveyor connected to receive first and second bias currents and configured to produce a first over-temperature signal at an output node in response to first and second input voltages VS1, VS2; and
a startup bias circuit configured to selectively connect the current conveyor to ground, comprising:
a first FET device having a gate terminal connected to receive the reference voltage VREF, a drain terminal connected to ground, and a source terminal connected to provide the first input voltage VS1,
a first diode-connected bipolar junction transistor (BJT) device having base and collector terminals connected to ground and an emitter terminal connected to provide a base-emitter voltage, and
a second FET device having gate and drain terminals connected to receive the base-emitter voltage from the first diode-connected BJT device and a source terminal connected to provide the second input voltage VS2 in response to variations in a device junction temperature detected by the first diode-connected BJT,

where the startup bias circuit and current conveyor are connected and activated to form a closed loop only when an emitter current at the first diode-connected BJT device enters a self-turned-on operation region, thereby activating the current conveyor to detect a temperature threshold being reached by the device junction temperature.