Patent ID: 8633756

Claim:
An apparatus including low voltage differential signaling (LVDS) circuitry capable of adaptively maintaining a minimum common mode input voltage, comprising: LVDS amplifier circuitry including input circuitry and output circuitry, and responsive to a LVDS input signal that includes a signal voltage and an input common mode voltage by providing a corresponding LVDS output signal and a voltage related to said input common mode voltage; voltage sensing circuitry coupled to said LVDS amplifier circuitry and responsive to said voltage related to said common mode voltage by providing at least one control signal; and voltage clamping circuitry coupled to said voltage sensing circuitry and said LVDS amplifier circuitry and responsive to said voltage sensing circuitry and said LVDS amplifier circuitry and responsive to said at least one control signal by clamping first and second common mode voltages within said input circuitry at a clamp voltage when said input common mode voltage is less than a predetermined reference voltage, and allowing said first and second common mode voltages within said input circuitry to track said input common mode voltage otherwise.