Methods and apparatus to detect impedance at an amplifier...

Details Methods and apparatus to detect impedance at an amplifier... Methods and apparatus to detect impedance at an amplifier...

2007-01-31

2008-11-11

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P

Reexamination Certificate

active

07449959

ABSTRACT:
Methods and apparatus to detect impedance at an amplifier output are described. In one example, a method of determining a relative value of an amplifier output load may include determining a current provided to the amplifier output load in response to an input signal; determining a current provided to a reference load in response to a signal based on the input signal; comparing the current provided to the amplifier output load to the current provided to the reference load; and indicating a relationship between the amplifier output load and the reference load based on the current provided to the amplifier output load and the current provided to the reference load.

REFERENCES:
patent: 4638258 (1987-01-01), Crooks
patent: 5289137 (1994-02-01), Nodar et al.
patent: 7075373 (2006-07-01), Briskin et al.
patent: 7276974 (2007-10-01), Newman et al.

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