Patent ID: 6249176
Filing Date: 2001-06-19
Classification: G05F

Abstract:
A temperature sensing device comprising:a ""current proportional to absolute temperature"" (IPTAT) circuit providing an first output voltage;a ""current proportional to Voltage-base-emitter"" (IPTVBE) circuit providing a second output voltage; anda temperature-sensing output circuit providing a third output voltage proportional to a difference of said first output voltage and said second output voltage;wherein one or more of said IPTAT circuit and said IPTVBE circuit includes a current mirror comprising:a reference circuit providing a first reference voltage and a reference current;a reference output circuit receiving said reference voltage and including a first current path having a current substantially a first predetermined multiple of said reference current, said first current path including a first electrical node;a bias circuit receiving said first reference voltage and including a second current path having a current substantially said first predetermined multiple of said reference current, said second path including a second electrical node, said bias circuit configured such that said second electrical node has a voltage substantially identical to the voltage of said first electrical node; andan output circuit including a cascode transistor, said output circuit receiving said first reference voltage and connected in series said cascode transistor and said load to form a third current path in which is flowed a current of a second predetermined multiple of said reference current, said cascode transistor being controlled by said voltage of said second electrical node.