Abstract: In a system for calibrating PAM4 signals, an equalizer determines a first signal amplitude measurement of the PAM4 signal. The equalizer determines a first signal boost measurement of the PAM4 signal. The equalizer determines whether the first signal boost measurement and the signal amplitude measurement are substantially consistent with each other. Responsive to determining that the signal boost and the signal amplitude are not substantially consistent with each other, the equalizer determines a reference amplification modification and calibrates a PAM4 signal according to the determined reference amplification modification.

Abstract: A system for protecting a camera driver circuit from a static discharge during cable connection is disclosed comprises a supply node having a supply voltage for a driver circuit and a ground on a ground node for the driver circuit. A resistor network is configured to receive a voltage from the supply node and generate a sensed voltage that is related to the voltage on the supply node. An amplifier or comparator compares the sensed voltage to a threshold voltage, and if the sensed voltage is greater than the threshold voltage, generate a control signal. A variable resistor is configured to receive the control signal and responsive to the control signal, establish a conductive path, or vary a resistance of the conductive path, between the supply node and the ground node, thereby shunting current through the conductive path from the supply node to the ground node.