Based on a step-recovery diode
design, this comb signal generator is optimized for an overall flat spectrum with an output frequency range from 1 MHz to 2.5 GHz.
Nguyen, "Uniplanar picosecond pulse generator using step-recovery diode
", Electronics Letters, vol.
The LO comprises a 100 MHz crystal oscillator and amplifier driving a step-recovery diode
comb generator, and exhibits a phase noise level that is at least 3 dB below the system noise specification.
An internal step-recovery diode
(SRD) multiplies the 142.875 MHz input signal, which is supplied by the external crystal oscillator, by 160.
This frequency is then multiplied and filtered to 14 GHz by a single step-recovery diode
multiplier, and finally multiplied again to 42 GHz by means of a balanced X3 Schottky diode multiplier.
Sometimes a step-recovery diode
(SRD) is used to generate a comb of output frequencies as an LO source.