Constant-current circuit and system power source using this...

Details Constant-current circuit and system power source using this... Constant-current circuit and system power source using this...

2007-09-11

2007-09-11

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

C323S315000

Reexamination Certificate

active

10580260

ABSTRACT:
A constant-current circuit and a system power source using this constant-current circuit are disclosed, which can generate plural highly accurate constant currents and supply them as bias currents by reducing variations caused by a change of a manufacturing process and a change of temperature. An operational amplification circuit AMP controls the operation of PMOS transistors M1and M2so that negative feedback is applied to a variation of one of currents i1and i2flowing from the PMOS transistors M1and M2and the variation is canceled. By making a constant current, which flows in a resistor R1connected to a potential difference generated by a difference of current densities flowing in two pnp transistors Q1and Q2to which currents are correspondingly supplied from the PMOS transistors M1and M2, to be a reference current; each of PMOS transistors MA1through MAn whose operation is controlled by the operational amplification circuit AMP generates a current proportional to the reference current and outputs the generated current.

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