G - Physics – 06 – G
Patent
G - Physics
06
G
G06G 7/24 (2006.01) H01L 29/68 (2006.01)
Patent
CA 2087522
A linear-to-exponential converter circuit (100) for generating a temperature-independent signal (270) which is exponential- ly related to an input signal (104). An amplifier stage (160) forming an exponential multiplier is comprised of a bipolar junction transistor (264) which, characteristic of bipolar junction transistors, generates a current at a collector elertrode (270) which is de- pendent upon temperature. A signal to be amplified by the exponential multiplier formed of the bipolar junction transistor is first provided to a temperature compensation circuit (108). The temperature compensation circuit introduces a temperature dependen- cy upon the input signal which is the inverse to that of the temperature dependency of the bipolar junction transistor of the ampli- fier stage. The temperature dependency of the amplified signal is removed, and a temperature-invariant signal is produced there- by.
Gowling Lafleur Henderson Llp
Motorola Inc.
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