Voltage limiter for electrostatic signal receiver

A voltage limiter for a signal receiver, the voltage limiter comprising:

• an input connectable to a signal source,
• an output connectable to a detector and connected to the input via a signal conductor,
• a ground conductor connectable to ground,
• a first branch connected to the signal conductor, connected to the ground conductor and comprising a first diode element,
• a second branch connected to the signal conductor, connected to the ground conductor and comprising a second diode element, and
• a resistor element between the signal conductor and the ground conductor, wherein one of the first branch and the second branch comprises a voltage source in series with the first diode element or second diode element, wherein
• along the first branch, from the signal conductor to the ground conductor, an anode of the first diode element is between the signal conductor and a cathode of the first diode element, and
• along the second branch, from the signal conductor to the ground conductor, a cathode of the second diode element is between the signal conductor and an anode of the first diode element, and
• wherein, electrically, the first branch and the second branch share both of a first node, at the signal conductor, and a second node, at the ground conductor, and the output is on the first node separate from the second node.