Non-inverting feedback amplifier with high disabled impedance

A non-inverting feedback amplifier with high disabled impedance includes a disableable signal amplifier; a feedback network having an input node, a feedback node and a reference node; the signal amplifier having a first input for receiving an input signal and a second input for receiving a feedback signal from the feedback node; and a reference buffer including a reference amplifier with its output directly connected to the reference node without additional series switching elements, a first input connected to a reference voltage, and a second input connected to its own output for mirroring at its output the reference voltage at its first input when the reference buffer and signal amplifier are enabled and presenting a high impedance between the feedback network and the reference voltage when the signal amplifier and reference buffer are disabled.