Temperature compensation control circuit for exponential gain fu

Details Temperature compensation control circuit for exponential gain fu Temperature compensation control circuit for exponential gain fu

1990-09-18

1992-11-10

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307493, 307492, 307145, 330254, 330256, G06G 712, H03F 130

Patent

active

051626780

ABSTRACT:
A temperature compensation control circuit to maintain a constant control gain in an AGC (automatic gain control) amplifier. The present invention compensates for the inherent temperature dependence without using any special processing or non-standard device structures. The present invention utilizes the voltage drop across n diodes in series to produce the control voltage difference (V.sub.C -V.sub.C *). These n series diodes are coupled to the collectors of a PNP emitter coupled pair with emitter resistance. This causes the control voltage difference to be dependent on temperature (nkT/q), but this dependency cancels out with the other inherent temperature dependency in the exponential function of the AGC amplifier which is also produced by a diode form. Thus, the present invention provides temperature compensation with minimum component matching problems and without the need for a PTAT (proportional to absolute temperature) current source.

REFERENCES:
patent: 3940708 (1976-02-01), Sumi et al.
patent: 4327333 (1982-04-01), Wilcox
patent: 4528516 (1985-07-01), Hill, III
patent: 4605906 (1986-08-01), Miller
patent: 5030924 (1991-07-01), Fritz

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