DDS-PLL method for frequency sweep

Details DDS-PLL method for frequency sweep DDS-PLL method for frequency sweep

2006-12-26

2006-12-26

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S183100, C455S192300, C331S004000, C331S010000, C375S376000

Reexamination Certificate

active

07155190

ABSTRACT:
A high frequency sweep generator uses a DDS-PLL method for frequency sweep over wide frequency spans. A digital sweep generator produces a linear ramp signal using DDS techniques that is applied to a coarse tuning port of a high frequency tunable oscillator, such as a YIG tunable oscillator (YTO). A PLL has as inputs an accurate linear swept frequency sinusoid from a DDS and a linear swept frequency output signal from the YTO to produce an error correction signal that is applied to a fine tuning port of the high frequency tunable oscillator. The error correction signal compensates for any non-linearities introduced into the linear swept frequency output signal by the high frequency tunable oscillator.

REFERENCES:
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patent: 5179725 (1993-01-01), Camp et al.
patent: 5838749 (1998-11-01), Casper et al.
patent: 6118345 (2000-09-01), Scheffold
Rohde & Schwarz “Service Manual Instrument—Spectrum Analyzer R&S FSU3, R&S FSU8, R&S FSU26”.

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