Current limit circuit for power amplifiers

Details Current limit circuit for power amplifiers Current limit circuit for power amplifiers

2007-03-20

2007-03-20

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

Reexamination Certificate

active

10979966

ABSTRACT:
According to one embodiment of the invention, a circuit arrangement includes a regulator circuit. The circuit arrangement further includes a current limit circuit coupled to the regulator circuit. The circuit arrangement further includes a power amplifier coupled to the regulator circuit, where the power amplifier is configured to draw a first current from the regular circuit. The current limit circuit is configured to decrease the first current when the first current causes a second current in the current limit circuit to be greater than a reference current. According to this embodiment, the second current is a mirror current of the first current. The current limit circuit includes a current sink, where the current sink is configured to sink the reference current to ground. The current limit circuit further includes a feedback loop, where the feedback loop causes the second current to be substantially equal to the reference current.

REFERENCES:
patent: 6665525 (2003-12-01), Dent et al.
patent: 6768382 (2004-07-01), Shie et al.
patent: 6888409 (2005-05-01), Taylor
patent: 6897730 (2005-05-01), Dupuis et al.

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