A phase shifting device , comprising: a common source input amplifier ; a biasing circuit ; a first common gate output amplifier ; a second common gate output amplifier ; and a quadrature hybrid coupler ; wherein: the input amplifier is connected to an input port (P1) of the coupler; the first output amplifier is connected to a through port (P2) of the coupler; the second output amplifier is connected to a coupled port (P3) of the coupler; the biasing circuit is connected to an isolated port (P4) of the coupler; wherein quadrature hybrid coupler is configured to: receive, at the input port, an input signal (IN) from the input amplifier; output, at the through port, a through signal (I); receive, at the isolated port, a bias signal from the biasing circuit; and output, at the coupled port, a coupled signal (Q) having a phase differing from a phase of the through signal; wherein the first output amplifier and the second output amplifier are variable-gain amplifiers; and wherein the first common gate output amplifier and the second common gate amplifier are configured to share the current with the common source input amplifier. a common source input amplifier ; a biasing circuit ; a first common gate output amplifier ; a second common gate output amplifier ; and a quadrature hybrid coupler ; wherein: the input amplifier is connected to an input port (P1) of the coupler; the first output amplifier is connected to a through port (P2) of the coupler; the second output amplifier is connected to a coupled port (P3) of the coupler; the biasing circuit is connected to an isolated port (P4) of the coupler; wherein quadrature hybrid coupler is configured to: receive, at the input port, an input signal (IN) from the input amplifier; output, at the through port, a through signal (I); receive, at the isolated port, a bias signal from the biasing circuit; and output, at the coupled port, a coupled signal (Q) having a phase differing from a phase of the through signal; wherein the first output amplifier and the second output amplifier are variable-gain amplifiers; and wherein the first common gate output amplifier and the second common gate amplifier are configured to share the current with the common source input amplifier. the input amplifier is connected to an input port (P1) of the coupler; the first output amplifier is connected to a through port (P2) of the coupler; the second output amplifier is connected to a coupled port (P3) of the coupler; the biasing circuit is connected to an isolated port (P4) of the coupler; wherein quadrature hybrid coupler is configured to: receive, at the input port, an input signal (IN) from the input amplifier; output, at the through port, a through signal (I); receive, at the isolated port, a bias signal from the biasing circuit; and output, at the coupled port, a coupled signal (Q) having a phase differing from a phase of the through signal; wherein the first output amplifier and the second output amplifier are variable-gain amplifiers; and wherein the first common gate output amplifier and the second common gate amplifier are configured to share the current with the common source input amplifier. receive, at the input port, an input signal (IN) from the input amplifier; output, at the through port, a through signal (I); receive, at the isolated port, a bias signal from the biasing circuit; and output, at the coupled port, a coupled signal (Q) having a phase differing from a phase of the through signal; wherein the first output amplifier and the second output amplifier are variable-gain amplifiers; and wherein the first common gate output amplifier and the second common gate amplifier are configured to share the current with the common source input amplifier. <EOS>