Patent ID: 7830217

Claim:
A vector signal generator with direct RF signal synthesis, comprising: (a) an RF signal synthesizer configured for converting baseband IQ signals into a modulated digital RF signal, said RF signal synthesizer having an I input, a Q input, a clock input, a control input, and an output, wherein the clock input is a clock input of the vector signal generator, the control input is a control input of the vector signal generator, and the output is an RF signal output of the vector signal generator; (b) a switch configured for selecting a source of IQ signals, said switch being connected to an external I input, an external Q input, a stored signal I input, a stored signal Q input, the control input, an I output, and a Q output, wherein the external I input and external Q input are external IQ inputs to the vector signal generator and the I output and the Q output are connected to the I input and the Q input of the RF signal synthesizer; and (c) a memory configured for storing IQ signals samples, said memory being connected to the control input and having a stored I output, connected to the stored signal I input, and a stored Q output connected to the stored signal Q input.