Comb Generators

APITech's Series 95 Comb Generators use a Step Recovery Diode (SRD) to generate very narrow voltage spikes; these in turn produce an output frequency spectrum rich in harmonics. The spacing between the signals is equal to the source that drives the SRD which, in most cases, is a stable crystal oscillator. The crystal oscillator is normally internal, however, an external signal can be used to drive the SRD.

Designing and producing our improved phase noise comb generators in-house allows API Technologies to offer improved Spurious response and better selectivity.

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Internal Reference

Model	Comb Spacing (MHz)	Output Power level (dBm @ Freq)	Output Power Level (dBm @ Freq)	In-Band Spurious(dB)	Freq. Stability (ppm)(ppm/C)	Supply
95228	500	0 dBm @ 500 MHz	-35 dBm @ 18 GHz	-80	15	15V / 150 mA
95229	1000	0 dBm @ 1000 MHz	-30 dBm @ 18 GHz	-80	15	15V / 150 mA

Features

Signal Integrity

Optional output filtering is provided to insure a clean signal with optimum combs within the acquired band of interest.

Customizable Options

For improved phase noise & stability, an internal OCXO is an option.
The output can be the full comb spectrum, filtered to select certain combs, or we can add a switched filter bank to select the output band of your choice.

External Frequency Sources

For improved noise & stability, we can phase lock to an external frequency source.

High Performance

he spacing between the comblines is equal to the frequency of the source that drives the SRD.
That source can be internal or external, crystal oscillator/VCO/CRO, fixed or voltage tuned, free running or phase locked, and many other combinations.