Patent ID: 7088177

Claim:
An amplifier apparatus; the apparatus receiving at least one input signal at an input structure; the apparatus comprising: (a) an integrating unit; said integrating unit being coupled with said input structure; said integrating unit integrating said at least one input signal and presenting an integrated input-indicating signal; (b) a first comparing unit coupled with said integrating unit; said first comparing unit comparing said integrated input-indicating signal with a varying reference signal to produce an output signal; and (c) a feedback circuit coupled to receive said integrated input-indicating signal and coupled with said input structure; said feedback circuit comprising: (1) a second comparing unit coupled for receiving said integrated input-indicating signal; said second comparing unit comparing said integrated input-indicating signal with a reference signal level related to said reference signal; said second comparing unit presenting an actuating signal when said integrated input-indicating signal has a predetermined relationship with said reference signal level; and (2) a switching unit coupled with said second comparing unit and with at least one of said integrating unit and said input structure; said switching unit responding to said actuating signal to affect said input signal appropriately to reduce said integrated input-indicating signal when said actuating signal is at a predetermined level.