Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1980-06-16
1982-06-01
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307491, 307492, 328145, H03K 326, G06G 724
Patent
active
043330231
ABSTRACT:
A logarithmic converter circuit comprising an emitter-coupled pair of transistors and a pair of operational amplifiers is provided with a temperature-stabilized environment so that accurate logarithmic conversion is facilitated. One of the pair of transistors is utilized as a temperature sensor to provide a temperature control voltage, which in turn controls the power applied to a heating element disposed adjacent the pair of transistors to maintain a constant semiconductor junction temperature. The heating element may suitably be one or more transistors disposed proximate the pair of transistors on a common substrate. The absolute temperature of the sensor transistor base-to-emitter junction is established by the use of precise gain-setting components, and by adjusting the temperature reference voltage for the correct system gain.
REFERENCES:
patent: 3308271 (1967-03-01), Hilbiber
patent: 3393870 (1968-07-01), Jeffrey
patent: 3703651 (1972-11-01), Blowers
patent: 4232233 (1980-11-01), Clouser et al.
Davis B. P.
Miller, Jr. Stanley D.
Noe George T.
Tektronix Inc.
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