Integrated temperature-compensated amplifier circuit

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Patent

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Details

330289, 327350, H03F 345

Patent

active

061042439

ABSTRACT:
In a fully integrated logarithmic amplifier, an input current is fed via a diode, and in a reference current branch parallel thereto, a constant current flows through a similar diode. A voltage divider forms of the differential voltage between the two diodes a partial voltage on a variable resistor of the voltage divider, which is processed by a differential amplifier for forming the output signal. Parallel to the two current branches mentioned, there is provided an additional current branch having a constant current source and a diode. The differential voltage between the diode of the reference current branch and the diode in the additional current branch is also divided by a voltage divider. A differential amplifier forms of the voltage on the variable resistor of the voltage divider an error signal which changes the variable resistance from which the differential amplifier has formed the error signal as well as the resistance fo the variable resistor of which the output signal is formed. As the voltage in the two variable resistors of each voltage divider is temperature-independent, the output signal of the amplifier is temperature-independent as well.

REFERENCES:
patent: 5047730 (1991-09-01), James et al.
patent: 5352973 (1994-10-01), Audy
patent: 5677561 (1997-10-01), Jensen

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