Patent ID: 7920798

Claim:
A receiver for receiving a signal conveying bursts of binary information, detecting logic levels of the binary information, and outputting a digital signal, the receiver comprising: a first node for receiving bursts of binary information; a differential limiting amplifier having a first input terminal and a second input terminal, the first node being coupled to the first input terminal, the limiting amplifier for outputting digital signals having predetermined magnitudes; a low pass filter coupled between the first node and the second input terminal, the low pass filter filtering the binary information in a burst and generating a threshold voltage for determining logical states of the binary information, the low pass filter having at least a first time constant and a second time constant, the first time constant being faster than the second time constant; and a timing generator for receiving a first signal indicating a start of a burst of binary information and, in response to the first signal, generating at least a second signal from the first signal, at least the second signal being coupled to the low pass filter, the low pass filter having the first time constant while receiving a first portion of the burst of binary information to generate a threshold voltage for the limiting amplifier, the timing generator then generating the second signal to cause the low pass filter to have the second time constant for stabilizing the threshold voltage while receiving a second portion of the burst of binary information, wherein the low pass filter comprises at least a filter capacitor, a first resistance, and a second resistance, wherein the second resistance is higher than the first resistance, wherein the first resistance is coupled between the first node and the capacitor during the first portion of the burst of binary information to create the first time constant, and the second resistance is coupled between the first node and the filter capacitor during the second portion of the binary information to create the second time constant, and wherein the first resistance comprises a first resistor of a first value in parallel with a second resistor of a second value, wherein the first value is less than one-tenth the second value, and the second resistance comprises only the second resistor.