Differential phase shifter

A phase shifter comprising:

• an I/Q generator configured to generate an in-phase signal and a quadrature-phase signal based on an input signal:
• a vector synthesis circuit configured to generate a first differential signal pair and a second differential signal pair based on the in-phase signal and the quadrature-phase signal, respectively, and generate an output signal based on the first differential signal pair and the second differential signal pair:
• a first digital-to-analog converter (DAC) configured to transmit first and second current control signals to the vector synthesis circuit to control the in-phase signal;
• and
• a second DAC configured to transmit third and fourth current control signals to the vector synthesis circuit to control the quadrature-phase signal,
• wherein the vector synthesis circuit includes a first common-gate amplifier, a second common-gate amplifier, a first common-source amplifier, and a second common-source amplifier.

A phase shifter comprising:

• an I/Q generator configured to generate an in-phase signal and a quadrature-phase signal based on an input signal;
• a vector synthesis circuit configured to generate a first differential signal pair and a second differential signal pair, and generate an output signal based on the first differential signal pair and the second differential signal pair;
• a first digital-to-analog converter (DAC) configured to transmit first and second current control signals to the vector synthesis circuit to control the in-phase signal;
• and
• a second DAC configured to transmit third and fourth current control signals to the vector synthesis circuit to control the quadrature-phase signal,
• wherein the vector synthesis circuit includes:
• a first differential signal pair generator configured to generate the first differential signal pair based on the in-phase signal;
• and
• a second differential signal pair generator configured to generate the second differential signal pair based on the quadrature-phase signal.