Abstract: A multi-function, balanced phase shifter and switch having a particular application as a balanced switched low-noise amplifier. The switch includes a hybrid input coupler that couples a first input signal at a first input port and a second input signal at a second input port into a first path and a second path of the switch. Each of the first path and the second path include at least one amplifier and a phase shifter. The phase shifters include a hybrid coupler and two switching devices that are simultaneously switched on or off by a single control signal. Output from the two paths are applied to an output hybrid coupler that couples the output from the two paths into first and second output ports of the switch. By controlling the two control signals applied to the phase shifters to selectively switch the switching devices on and off, signals at the input ports can be selectively amplified and switched to the output ports in a balanced, low-noise manner.