System and method for generating balanced modulated signals with arbitrary amplitude and phase control using modulation

• Main Authors: Dunsmore, Joel P, Carone, Berry, Sparks, Stephen T
• Format: Patent
• Language: English
• Published: 27.07.2004

This invention relates to balanced differential output generation circuits and more particularly to systems and methods for generating balanced modulated signals with arbitrary amplitude and phase control using modulation. Modulated differential (balanced) drive signals are created where, at least one of the signals can be controlled in phase relative to the other, and both of which could be controlled in amplitude and both of which have the same modulation envelope. In one embodiment, a coherent signal is generated in a first electronic signal generator (ESG) and applied to a second ESG. The coherent signal replaces the normal input signal of the second ESG and the I and Q inputs of the second ESG control the amplitude and phase of the output signal. This output signal is applied to a third ESG replacing the normal input signal to the vector modulator. The vector modulator is controlled by the same I and Q input as is the first ESG, thereby producing an output signal which has the same modulation envelope as the output signal from the first