Symmetrical bipolar bias current source with high power supply r

Details Symmetrical bipolar bias current source with high power supply r Symmetrical bipolar bias current source with high power supply r

1992-11-16

1994-05-24

Voeltz, Emanuel T.

Electricity: power supply or regulation systems

Self-regulating

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

323313, 323316, 3072961, 3072966, G05F 326

Patent

active

053152310

ABSTRACT:
A bandgap reference voltage source (104) has positive and negative terminals (104a,104b) which are connected through high impedance constant current sources (124c,126c) to positive and negative voltage supplies (+VDD,-VEE) respectively. The effect of variations of the voltage supplies (+VDD, -VEE) on the voltage source (104) is low due to the high impedances of the currents sources (124c,126c), providing a high power supply rejection ratio (PSRR). The reference voltage (VREF) generated by the voltage source (104) is converted into a reference current (IREF) which flows through two equal series resistors (108,110), and also through current mirrors (124,126) which produce positive and negative output currents corresponding thereto. The current sources (124c,126c) for the voltage source (104) are also controlled by the current mirrors (124,126). A servo control amplifier (232) senses the voltage at the junction (234) of the resistors (108,110) and adjusts the voltage at either the positive or negative terminal (104a,104b) of the voltage source (104) to maintain the voltages at the terminals (104a,104b) symmetrical with respect to ground, thereby preventing the voltage source (104) from latching to one of the voltage supplies (+VDD,-VEE) during startup.

REFERENCES:
patent: 4595883 (1986-06-01), Nakayama
patent: 4933644 (1990-06-01), Fattaruso et al.
patent: 4970470 (1990-11-01), Gosser
patent: 5223743 (1993-06-01), Nakagawara

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