T-switch with shunt for improved receiver sensitivity

A wireless communication apparatus comprising:

• a first switch having a first input, a first output, and a first control input;
• a second switch having a second input connected to the first output, a second output, and a second control input;
• a shunt capacitor coupled between the first output and a reference potential, wherein the shunt capacitor is further coupled between the second input and the reference potential;
• a first shunt switch having a third control input, a third input, and a third output, wherein the third input is coupled to the first control input, and the third output is coupled to the reference potential;
• and
• a second shunt switch having a fourth control input, a fourth input, and a fourth output, wherein the fourth input is coupled to the second control input, and the fourth output is coupled to the reference potential.

A wireless communication apparatus comprising:

• switching circuitry comprising:
• a first switch having a first input, a first output, and a first control input;
• a second switch having a second input electrically coupled to the first output of the first switch, a second output, and a second control input;
• a third switch having a third input, a third output, and a third control input;
• a fourth switch having a fourth input electrically coupled to the third output of the third switch, a fourth output, and a fourth control input;
• a capacitor having a first terminal electrically coupled to the first output and having a second terminal electrically coupled to the third output;
• a fifth switch electrically coupled between the first control input and the third control input;
• and
• a sixth switch electrically coupled between the second control input and the fourth control input.

A wireless communication apparatus comprising:

• switching circuitry comprising:
• a first transistor having a first source, a first drain, and a first gate;
• a second transistor having a second source electrically coupled to the first drain of the first transistor, wherein the second transistor has a second drain and a second gate;
• a third transistor having a third source, a third drain, and a third gate;
• a fourth transistor having a fourth source electrically coupled to the third drain of the third transistor, wherein the fourth transistor has a fourth drain, and a fourth gate;
• a capacitor having a first terminal electrically coupled to the first drain, and the capacitor further having a second terminal electrically coupled to the third drain;
• a fifth transistor having a fifth source coupled to the third gate, a fifth drain coupled to the first gate, and a fifth gate;
• and
• a sixth transistor having a sixth source coupled to the fourth gate, a sixth drain coupled to the second gate, and a sixth gate.

A method comprising:

• controlling switching circuitry of a circuit in a first mode to isolate an input of the switching circuitry from an output of the switching circuitry with first control signals configured to:
• select an open configuration for a first switch and an open configuration for a second switch, the first switch having an input, an output, and a control input for the first control signals, and the second switch having an output, an input coupled to the output of the first switch, and a control input for the first control signals;
• and
• select a closed configuration for a first shunt switch and a second shunt switch, the first shunt switch configured to shunt parasitic transmission path signals from the first switch when the first switch is in the open configuration and the first shunt switch is in the closed configuration, and the second shunt switch configured to shunt parasitic transmission path signals from the second switch when the second switch is in the open configuration and the second shunt switch is in the closed configuration;
• and
• controlling the switching circuitry of the circuit in a second mode to connect the input of the switching circuitry to the output of the switching circuitry with second control signals configured to:
• select a closed configuration for the first switch and a closed configuration for the second switch;
• and
• select an open configuration for the first shunt switch and the second shunt switch.