Circuit for filtering a power supply for noise sensitive devices

Details Circuit for filtering a power supply for noise sensitive devices Circuit for filtering a power supply for noise sensitive devices

1997-01-27

1998-10-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327532, 327538, 327558, H03B 100

Patent

active

058252380

ABSTRACT:
The present invention comprises an active shunt filter for filtering a power supply for noise sensitive devices. The active shunt filter includes a transistor and an op amp. A first resistor is coupled between the emitter of the transistor and a first power supply. A second resistor is coupled between the collector of the transistor and a ground. A third resistor is coupled between the base of the transistor and the output of the op amp. The output of the op amp controls the impedance of the transistor. The op amp is coupled to receive power from a second power supply. The negative input of the op amp is coupled to the emitter. The positive input of the op amp is coupled to the first power supply via a fourth resistor. A fifth resistor couples the positive input of the op amp to ground. A capacitor is also coupled between the positive input of the op amp and ground. The op amp controls a shunt current flowing from the first power supply to ground via the transistor to produce a filtered power output for a noise sensitive device at the emitter of the transistor.

REFERENCES:
patent: 3755749 (1973-08-01), Van Ryswyk et al.
patent: 3755750 (1973-08-01), Heberling
patent: 5568960 (1996-10-01), Oleson et al.

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