Patent ID: 7733175

Claim:
A feed-forward automatic-gain control amplifier (FFAGCA) for biomedical applications comprising: an input; an output; a controller; a detector being connected to the input and the controller; and a variable gain amplifier (VGA) being connected to the input, the controller and the output, further comprising: a peak detector; and an analog to digital converter (ADC) being connected to the peak detector, and wherein the peak detector comprising: a detector input; a detector output; a first detector stage being connected to the detector input, and; a second detector stage, the second detector stage being connected to the detector output, and wherein the first detector stage comprising: a detected input; a resistor, the resistor having two ends, one end of the resistor being connected to the negative input of a noninverting operational amplifier and the other end being connected to the detector output; the noninverting operational amplifier having a negative input, a positive input and an output, wherein positive input being connected to the detector input; a first diode in a feedback loop, the first diode having two ends, one end of the first diode being connected between the resistor and the negative input of the noninverting operational amplifier, and the other end of the first diode being connected to the output of the noninverting operational amplifier; and a second diode, the second diode having two ends, one end of the second diode being connected to the output of the noninverting operational amplifier and the first diode in series, and the other end being connected between a capacitor and the positive input of the gain buffer operational amplifier.