Feed forward echo cancellation device and echo cancellation method

An echo cancellation method, comprising:

• outputting a first current to a node in response to a transmission current, wherein the node is connected to an input terminal of a programmable gain amplifier circuit via a gain control circuit, and the gain control circuit is configured to set a gain of the programmable gain amplifier circuit;
• draining an echo cancellation current from the node;
• and
• outputting a second current to the node in response to the transmission current, wherein a summation of the first current and the second current is approximate to the echo cancellation current, wherein the second current is outputted from a second impedance circuit, and a bandwidth of the second impedance circuit is controlled based on an output of the programmable gain amplifier circuit.