Temperature detecting circuit, temperature compensating circuit, and buffer circuit

摘要

A temperature detecting circuit includes a first rectifying element with a cathode at a first reference voltage and an anode connected to a first node, a first impedance element connected in series with a second rectifying element between the first rectifying element and a second reference voltage, a third rectifying element with a cathode at the first reference voltage and an anode connected to a second node, a second impedance element and a fourth rectifying element connected in series between the third rectifying element and the second reference voltage, and a differential amplifier that outputs a differential signal pair corresponding to the difference in potential between the first node and the second node. The differential signals in the pair vary in magnitude in opposite directions in response to temperature changes.

主权项

1. A temperature detecting circuit, comprising:
a first rectifying element with a cathode at a first reference voltage and an anode connected to a first node; a first impedance element connected in series with a second rectifying element, the first impedance element and the second rectifying element connected between the first node and a second reference voltage; a third rectifying element with a cathode at the first reference voltage and an anode connected to a second node; a second impedance element connected in series with a fourth rectifying element, the second impedance element and the fourth rectifying element connected between the second node and the second reference voltage; a first voltage dividing circuit connected between the first node and the first reference voltage; and a differential amplifier configured to output a differential signal pair based on a difference in potential between the first node and the second node, wherein in response to temperature changes, a magnitude of a first signal of the differential signal pair increases when a magnitude of a second signal of the differential signal pair decreases and the magnitude of the first signal of the differential signal pair decreases when the magnitude of the second signal of the differential signal pair increases, and the difference in potential between the first node and the second node is determined using a first divided voltage corresponding to the potential at the first node, the first divided voltage being supplied to the differential amplifier from the first voltage dividing circuit.