Constant temperature environment for semiconductor circuit elements

Claim 1

AN ARRANGEMENT FOR MAINTAINING A CONSTANT TEMPERATURE ENVIRONMENT FOR SEMICONDUCTOR CIRCUIT ELEMENTS COMPRISING AT LEAST ONE HEATING SEMICONDUCTOR DEVICE FOR DISSIPATING HEAT IN ACCORDANCE WITH THE CURRENT FLOWING THERETHROUGH, AT LEAST ONE SEMICONDUCTOR CIRCUIT ELEMENT TO BE MAINTAINED AT A CONSTANT TEMPERATURE, A SUBSTRATE COMMON TO SAID HEATING DEVICE AND CIRCUIT ELEMENT AND IN GOOD THERMAL CONTACT THEREWITH, AND TEMPERATURE SENSING TRANSISTOR HAVING AN EMITTER, A BASE, A COLLECTOR, AND A BASE-EMITTER JUNCTION, SAID TRANSISTOR IN GOOD THERMAL CONTACT WITH SAID SUBSTRATE FOR PRODUCING A CONTROL VOLTAGE SIGNAL ACROSS SAID BASE-EMITTER JUNCTION IN PROPORTION TO THE TEMPERATURE OF SAID SUBSTRATE, SAID TEMPERATURE SENSING TRANSISTOR BEING COUPLED TO EACH OF SAID HEATING SEMICONDUCTOR DEVICE TO CONTROL SAID CURRENT THERETHROUGH IN ACCORDANCE WITH SAID CONTROL VOLTAGE SIGNAL TO MAINTAIN A CONSTANT TEMPERATURE IN SAID SUBSTRATE AND THEREFORE IN THE VICINITY OF EACH OF SAID CIRCUIT ELEMENTS.