A RADAR system comprising: a signal generator comprising a stable local oscillator that outputs a first lower-frequency signal (306, 406), a direct digital synthesis circuit that outputs an analog waveform 416) by generating a time-varying signal in digital form and performing a digital-to-analog conversion to produce the analog waveform, a mixer coupled to receive the first lower-frequency signal from the stable oscillator, and a first split signal and a second split signal with a 90-degree phase shift between the first split signal and the second split signal, from the direct digital synthesis circuit, the mixer to mix the first lower-frequency signal, the first split signal and the second split signal to generate an intermediate signal having a first frequency as a signal generator output signal (430, 602); an up converter coupled with the signal generator to receive the signal generator output signal, the up converter to filter and to increase frequencies of the signal generator output signal to generate a filtered and frequency multiplied signal, wherein the signal generator output signal is amplified by an amplifier, filtered by a low-pass filter, a frequency is increased by a frequency multiplier, and filtered by a band-pass filter; and a transmitter coupled with the up converter to receive the filtered and frequency multiplied signal, the transmitter to transmit a corresponding radar output signal toward a remote target. a signal generator comprising a stable local oscillator that outputs a first lower-frequency signal (306, 406), a direct digital synthesis circuit that outputs an analog waveform 416) by generating a time-varying signal in digital form and performing a digital-to-analog conversion to produce the analog waveform, a mixer coupled to receive the first lower-frequency signal from the stable oscillator, and a first split signal and a second split signal with a 90-degree phase shift between the first split signal and the second split signal, from the direct digital synthesis circuit, the mixer to mix the first lower-frequency signal, the first split signal and the second split signal to generate an intermediate signal having a first frequency as a signal generator output signal (430, 602); a stable local oscillator that outputs a first lower-frequency signal (306, 406), a direct digital synthesis circuit that outputs an analog waveform 416) by generating a time-varying signal in digital form and performing a digital-to-analog conversion to produce the analog waveform, a mixer coupled to receive the first lower-frequency signal from the stable oscillator, and a first split signal and a second split signal with a 90-degree phase shift between the first split signal and the second split signal, from the direct digital synthesis circuit, the mixer to mix the first lower-frequency signal, the first split signal and the second split signal to generate an intermediate signal having a first frequency as a signal generator output signal (430, 602); an up converter coupled with the signal generator to receive the signal generator output signal, the up converter to filter and to increase frequencies of the signal generator output signal to generate a filtered and frequency multiplied signal, wherein the signal generator output signal is amplified by an amplifier, filtered by a low-pass filter, a frequency is increased by a frequency multiplier, and filtered by a band-pass filter; and a transmitter coupled with the up converter to receive the filtered and frequency multiplied signal, the transmitter to transmit a corresponding radar output signal toward a remote target.