DC bias configuration for pin diode SPDT switch

A single-pole double-throw PIN-diode based switch assembly comprising:

• a first series PIN diode connected between a first port and a second port;
• a second series PIN diode connected back-to-back with the first series PIN diode between the first port and a third port;
• a first shunt PIN diode connected between the second port and a reference node;
• a second shunt PIN diode connected between the third port and the reference node;
• a first bias control contact coupled to the second port and configured to receive a first bias control signal;
• and
• a second bias control contact coupled to the third port and configured to receive a second bias control signal, the first and second bias control signals being simultaneously selectively and oppositely switchable between a first voltage value and a second voltage value, such that when the first bias control signal has the first voltage value, the second bias control signal has the second value, and when the first bias control signal has the second voltage value, the second bias control signal has the first voltage value, the first and second bias control signals together configured to control a bias condition of each of the first series PIN diode, the second series PIN diode, the first shunt PIN diode, and the second shunt PIN diode to operate the switch between a first mode of operation in which signal flow is enabled between the first port and the second port and isolation is provided between the first port and the third port, and a second mode of operation in which signal flow is enabled between the first port and the third port and isolation is provided between the first port and the second port.