Differential switch with off-state isolation enhancement

A differential switching device for reducing off-state leakage current, the device comprising:

• a primary switch having a differential input, and for receiving a differential input signal at its differential input, wherein in an enabled-state of the device, the differential input signal is passed to a differential output of the primary switch;
• and
• a dummy switch having a differential input, and for receiving the differential input signal at its differential input, wherein in a disabled-state of the device, off-state leakage current is cancelled at the differential output of the primary switch, by virtue of the dummy switch having its differential output reverse-coupled to the differential output of the primary switch.

A differential switching device for reducing off-state leakage current, the device comprising:

• a primary switch having a differential input and a first differential pair of transistors, and for receiving a differential input signal at its differential input, and the first differential pair of transistors is operatively coupled to a primary current source that is controllable by a control signal, and wherein in an enabled-state of the device, the differential input signal is passed to a differential output of the primary switch;
• and
• a dummy switch having a differential input and a second differential pair of transistors, and for receiving the differential input signal at its differential input, and the second differential pair of transistors is operatively coupled to a dummy current source, wherein in a disable-state of the device, off-state leakage current is cancelled at the differential output of the primary switch, by virtue of the dummy switch having its differential output reverse-coupled to the differential output of the primary switch, and wherein the dummy switch is prevented from passing signals other than off-state leakage signals.