Non-inverting feedback amplifier with high disabled impedance

A non-inverting feedback amplifier with high disabled impedance comprising:

• a signal amplifier;
• a feedback network having an output node, feedback node and a reference node;
• said signal amplifier having a first output for receiving an input signal and a second input for receiving a feedback signal from said feedback node;
• and
• a reference buffer including a reference amplifier with its output connected to said reference node, 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 said reference buffer and signal amplifier are enabled and said reference buffer presenting a high impedance between said feedback network and said reference voltage when said signal amplifier and reference buffer are disabled,
• wherein said signal amplifier and said reference voltage are disabled and enabled synchronously.