Constant current source for integrated circuits

Details Constant current source for integrated circuits Constant current source for integrated circuits

1984-10-17

1986-06-24

Beha, Jr., William H.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

330257, G05F 320

Patent

active

045969485

ABSTRACT:
A stabilized current source for integrated circuit use utilizes a linear ramp voltage across a capacitor to provide the desired current value in a "control" transistor which is in a current mirror relationship with a bias-current-providing transistor. The control and bias-providing transistors are "matched", in the sense that the ratio of the current value in one to the current value in the other remains the same at all times, provided they are subject to the same voltage. The linear ramp voltage across the capacitor causes a constant current to flow through the capacitor and the control transistor. The voltages across the control and bias-providing transistors are retained at the same value. Leakage at one voltage reference terminal of the bias-providing transistor is periodically compensated for by closing a switch between it and the corresponding reference terminal of the control transistor. Thus, the constant current in the control transistor is replicated in the matched bias-providing transistor.

REFERENCES:
patent: 4521739 (1985-06-01), Peterson

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