G - Physics – 06 – G
Patent
G - Physics
06
G
354/149
G06G 7/24 (2006.01) H03F 1/30 (2006.01)
Patent
CA 1203628
ABSTRACT OF THE DISCLOSURE A log-amp or log-ratio circuit for producing a temperature-independent output signal corresponding to the logarithm of the ratio of a pair of input cur- rents. The basic logarithm function is generated by a pair of opposed P-N junctions through which the respec- tive input currents flow. Temperature compensation is effected by a circuit including a second pair of opposed P-N junctions which receive a PTAT current split between the junctions in accordance with a modulation factor pro- portional to the desired logarithmic function. The tem- perature-induced signal variations produced by the PTAT current source are equal and opposite to the temperature- induced signal variations produced in the first pair of P-N junctions, and a temperature-independent output sig- nal is developed in accordance with the modulation factor applied to the PTAT current through the second pair of P-N junctions.
443011
Analog Devices Incorporated
Westell & Hanley
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