MOSFET CIRCUIT SENSES DCV ON RF COAX TO KEY REMOTE AMPLIFIER
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2001-Nov-21
A remote amplifier amplifies the RF output of a transmitting portable radio. A coaxial path between the portable radio and amplifier serves as the RF signal path as well as the control signal path. When the portable is in the receive- mode, the remote amplifier has a thmugh RF path for the antenna receive signals to be passed on to the portable receiver. When the portable is in the transmit-mode, the coaxial path is replaced with the amplifier circuit. The switching of these paths is done by a TX detect circuit which is the subject of this disclosure.