Radio frequency switch for reducing signal reflection

A radio frequency (RF) switch comprising:

• a first signal terminal;
• a reference voltage terminal;
• and
• a first shunt path comprising:
• a first transistor comprising a first terminal coupled to the first signal terminal;
• a second terminal;
• and a control terminal;
• and
• a second transistor comprising a first terminal coupled to the second terminal of the first transistor;
• a second terminal coupled to the reference voltage terminal;
• and a control terminal;
• wherein when the first shunt path is switched to a first state, the first shunt path has a first impedance, and when the first shunt path is switched to a second state, the first shunt path has a second impedance, the first impedance and the second impedance being different;
• and
• the first impedance is between 40 ohms and 85 ohms.

A radio frequency (RF) switch comprising:

• a first signal terminal coupled to a load having a load impedance;
• a reference voltage terminal;
• and
• N stacked transistors comprising a first terminal coupled to the first signal terminal;
• a second terminal coupled to the reference voltage terminal;
• and a control terminal, N being a positive integer exceeding 1;
• wherein when the N stacked transistors are turned on, the N stacked transistors have a first impedance, when the N stacked transistors are turned off, the N stacked transistors have a second impedance, the N stacked transistors have a second impedance, the first impedance being different from the second impedance;
• and
• the first impedance matches the load impedance.