Current source modulator

Details Current source modulator Current source modulator

2005-09-13

2005-09-13

Kinkead, Arnold (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

C332S107000, C342S202000, C342S203000, C323S270000, C323S271000, C340S870180, C340S870190

Reexamination Certificate

active

06943640

ABSTRACT:
A current source modulator (202; 302, 502) provides power to radar transmitters. The modulator comprises a power supply (210, 310, 510) providing, when enabled, a known current to a storage capacitor (145). A comparator circuit (220) provides a signal (V220) when voltage (VC) across the storage capacitor (145) falls a reference voltage, and an enable circuit (225) responds to the comparator signal (V220) and an ON command signal to enable the power supply (210, 310, 510). The modulator (202, 302, 502) further includes a network (220N) associated with the comparator circuit (220) to retain the value of the signal (provide hysteresis) when the voltage across the storage capacitor is above the reference voltage. The modulator (202, 302, 502) may include a second network (320N) associated with a second comparator circuit, operable to retain a second signal when capacitor (145) voltage VCis above a reference voltage. In this aspect, there is a rapid charge and a trickle charge that reduces any charging overshoot.

REFERENCES:
patent: 5942810 (1999-08-01), Jisland et al.
patent: 6456050 (2002-09-01), Agiman

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