lf442mh/883 National Semiconductor Corporation, lf442mh/883 Datasheet - Page 13
lf442mh/883
Manufacturer Part Number
lf442mh/883
Description
Dual Low Power Jfet Input Operational Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
1.LF442MH883.pdf
(16 pages)
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lf442mh/883C
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Unconventional Log Amplifier
20149415
Q1, Q2, Q3 are included on LM389 amplifier chip which is temperature-stabilized by the LM389 and Q2-Q3, which act as a heater-sensor pair.
Q1, the logging transistor, is thus immune to ambient temperature variation and requires no temperature compensation at all.
13
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