Electronic device and method for low leakage switching
View Patent ↗The invention relates to a low leakage switch having an input node for receiving an input voltage and an output node for providing an output voltage. The low leakage switch comprises a main sampling transistor the backgate voltage of which is biased through other transistors, and wherein the control gate of the main sampling transistor is controlled through a second control signal and the control gates of the other transistors are controlled through a first control signal, wherein the electronic device is further configured to activate the other transistor for adjusting the backgate voltage of the main sampling transistor through the first control signal before activating the main sampling transistor for sampling the input voltage on a main sampling capacitor through the second control signal.
1. A low leakage switch comprising a first transistor being configured to receive an input voltage at a first side of its channel, a second transistor being configured to receive an input voltage at a first side of its channel and coupled with a second side of its channel to a backgate of the first transistor and a third transistor being configured to receive an input voltage at a first side of its channel and coupled with a second side of its channel to a backgate of the second transistor, wherein the low leakage switch further comprises a pre-sampling transistor and a pre-sampling capacitor and wherein the pre-sampling transistor is coupled with a first side of its channel to an input node, with a second side of its channel to the pre-sampling capacitor, and the first transistor is coupled with the first side of its channel to the second side of the channel of the pre-sampling transistor and to the pre-sampling capacitor;
wherein a control gate of the pre-sampling transistor is coupled to receive a first control signal and a control gate of the first transistor is coupled to receive a second control signal; and
wherein control gates of the second transistor and the third transistor are coupled to receive the first control signal.
2. The low leakage switch of claim 1 , being further configured to activate the second transistor for adjusting the backgate voltage of the first transistor through the first control signal before activating the first transistor through the second control signal.