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US 4,047,121 AGranted
RF signal generator
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorKenneth J. Campbell
Life of this patent
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Abstract
An RF test signal generator including a driving oscillator, a pulse generr for generating narrow spikes at the oscillator frequency (such as a step recovery diode), a modulator and an attenuator. Since the very narrow pulse exhibits nearly constant amplitude in the frequency domain, a constant amplitude comb spectrum with frequency spacing at the oscillator frequency is generated so as to facilitate automated testing techniques.
Claims5
In a signal generator for generating modulated RF signals available for testing key parameters of receivers the combination comprising:
- (a) signal generating means for generating an output signal of a predetermined frequency;
- (b) pulse generating means coupled to said signal generating means for generating spike output pulses at said predetermined frequency;
- (c) balanced mixer modulator circuit means coupled to said pulse generator means;
- (d) a source of amplitude modulating signal means coupled to said modulator circuit means for modulating said narrow pulses to provide a plurality of RF signals at the output of said modulator circuit means.
1 more element
Dependencies are inferred from the claim text.