Radio frequency front end modules implementing coexisting time division duplexing and frequency division duplexing

A mobile device comprising:

• an antenna configured to transmit radio frequency signals to a base station;
• a time-division duplexing power amplifier, a time-division duplexing low noise amplifier, and a frequency division duplexing terminal;
• and
• a front end system coupled to the antenna, the time-division duplexing power amplifier, the time-division duplexing low noise amplifier, and the frequency division duplexing terminal, the front end system including a first switch configured to selectively connect the time-division duplexing power amplifier to either a first node or the antenna based on a first control signal, a second switch configured to selectively connect the time-division duplexing low noise amplifier to either a second node or the antenna based on a second control signal, a third switch configured to connect the frequency division duplexing terminal to the antenna based on a third control signal, and a controller configured to generate the first, second, and third control signals, to provide:
• i) a first delay between switching connection of the time-division duplexing power amplifier from the antenna to the first node, and ii) a second delay between switching connection of the time-division duplexing low noise amplifier from the antenna to the second node.

A method of operating a radio frequency device, comprising:

• coupling, via a first switch, a time-division duplexing transmit terminal to either a first node or an antenna based on a first control signal;
• coupling, via a second switch, a time-division duplexing receive terminal to either a second node or the antenna based on a second control signal;
• coupling, via a third switch, a frequency division duplexing terminal to the antenna based on a third control signal;
• providing a first delay between switching connection of the time-division duplexing transmit terminal from the antenna to the first node;
• and
• providing a second delay between switching connection of the time-division duplexing receiver terminal from the antenna to the second node.