Patent ID: 8248297

Claim:
A system that measures phase noise, comprising: a local oscillator; a power divider for dividing an input RF signal from a source other than said local oscillator into two signal components that are output therefrom; two mixers, each arranged in a path of a respective one of the signal components from said power divider, each mixer receiving a respective one of the signal components from said power divider and a signal from said local oscillator; and a data acquisition and digital analysis subsystem that receives analog signals from said mixers, converts the analog signals into digital signals and analyzes the digital signals, said data acquisition and digital analysis subsystem comprising: two digital radio frequency memories, each associated with a respective one of said mixers and receiving an input signal therefrom; and a digital signal processor that receives signals from said two digital radio frequency memories and outputs a single digital data stream indicative of measured phase noise.