H - Electricity – 03 – K
Patent
H - Electricity
03
K
323/13
H03K 17/14 (2006.01) H03F 1/30 (2006.01) H03F 3/45 (2006.01)
Patent
CA 1147805
Abstract of the Disclosure A temperature compensated current source includes three successive source current paths to produce a controlled output current. Each current path has a different value of current flowing therein so that current fluctua- tions in one current path will tend to be isolated from the other current paths because of the difference in current flow. In the embodiment of the invention shown, a reference zener diode provides a reference voltage at the base of a first transistor to establish a first reference current as its emitter current. A second transistor uses the first current as the reference to establish a second current value which has a positive temperature coefficient. Third, fourth and fifth transistors use the second reference current to establish a third reference current value independent of the gain values of these transis- tors. In the embodiment of the invention described, the third reference cur- rent is used to establish a reference voltage stable with respect to variations in the power supply, transistor gain and resistivity fluctuations of the cir- cuit but with increasing voltage as a function of temperature. This voltage variation is used in combination with a load to cancel the effect of the load variations with temperature by providing an increased source voltage as a function of temperature.
362808
Control Data Corporation
Smart & Biggar
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