Base station antennas having transmitters and receivers therein that support time division duplexing (tdd) with enhanced bias control for high speed switching

A bidirectional communication circuit for time division duplexing (TDD), comprising:

• a radio frequency (RF) transmitter having first and second input terminals responsive to a first bias control voltage and a first RF input signal, respectively;
• a first bias control circuit comprising a first closed-loop feedback path extending between a current receiving terminal and the first input terminal of said RF transmitter, said first closed-loop feedback path configured to regulate a magnitude of the first bias control voltage when said RF transmitter is enabled;
• a radio frequency (RF) receiver having first and second input terminals responsive to a second bias control voltage and a second RF input signal, respectively;
• and
• a second bias control circuit comprising a second closed-loop feedback path extending between a current receiving terminal and the first input terminal of said RF receiver, said second closed-loop feedback path configured to regulate a magnitude of the second bias control voltage when said RF receiver is enabled.