Digital communication receiver interface circuit for line-pair with duty cycle imbalance compensation

A device, comprising:

• an interface circuit configured to interface a Digital Addressable Lighting Interface (DALI) bus with a controller, wherein the interface circuit comprises:
• a diode bridge having polarity-independent input terminals configured to be coupled to the DALI bus, and further having a positive output terminal and a negative output terminal, wherein the diode bridge is configured to receive a receive signal from the DALI bus;
• a current limiter configured to limit an input current supplied to the interface circuit from DALI bus via the diode bridge;
• an optocoupler having an input configured to receive the receive signal from the diode bridge and having an output configured to output the receive signal, galvanically isolated from the diode bridge and the DALI bus;
• a receive signal threshold reference device configured to set a threshold voltage for the optocoupler to respond to the receive signal;
• an optocoupler input current control device configured to divert at least a portion of the current supplied to the interface circuit from being supplied to an input of the optocoupler;
• an amplifier configured to receive the galvanically isolated receive signal from the optocoupler and to output a binary digital signal;
• a low-pass filter (LPF) configured to output the binary digital signal to the controller;
• and
• a variable edge delay circuit configured to delay rising edges of the galvanically isolated receive signal substantially more than falling edges of the galvanically isolated receive signal, or to delay falling edges of the galvanically isolated receive signal substantially more than rising edges of the galvanically isolated receive signal.