You may use a balanced amplifier configuration with two 90° hybrid couplers. This is a practical method for obtaining a broadband amplifier with output power equal to twice that of a single amplifier. The output 3rd order intercept performance is also improved by 3 dB. Some other advantages of a balanced amplifier:
- redundancy - if one of the amplifier stages fails, the balanced amplifier will still operate with reduced gain and linearity.
- input and output VSWR dependent on the coupler. Individual amplifiers can be matched for specific parameters - IP3, P1dB, etc.
- easily cascaded - each unit is isolated by the coupler.
- high degree of stability.