Patent ID: 7065153

Claim:
A system for modulating an RF carrier comprising: at least one pair of balanced modulators, wherein said modulators are identically configured with respect to control of device and component matching and circuit symmetry on a monolithic microwave integrated circuit (MMIC), each modulator including: a lowpass filter with input connected to the RF carrier, said lowpass filter producing a first phase shifted carrier output; a highpass filter with input connected to the RE carrier, said highpass filter producing a second phase shifted carrier output; a data port for receiving data bit information; a symmetrical pair of notch filters, each centered at the frequency of the RF carrier, wherein a first of said symmetrical pair of notch filters feeds said data bit information exclusive of said RF carrier to said data port; and a second of said symmetrical pair of notch filters feeds a complement of said data bit information exclusive of said RF carrier to said data port and a switch connected to an output of said lowpass filter and connected to an output of said highpass filter, said switch configured to select and output either said first phase shifted carrier output from said lowpass filter or said second phase shifted carrier output from said highpass filter depending on a switching state, said switching state determined by said data bit information at said data port.