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Comments on "State-preserving intermittently locked loop (SPILL) frequency synthesizer for portable radio" [with reply]

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2 Author(s)
D. V. Thiel ; Div. of Sci. & Technol., Griffith Univ., Brisbane, Qld., Australia ; S. Saito

For the original article see ibid., vol.37, no.12, p.1898-1903 (1989). The commenter on the above-mentioned work draws attention to a similar technique in which the feedback path is controlled using a sample-and-hold circuit between the loop filter and the voltage-controlled oscillator block. The author, in replying, indicates that there is a substantial difference between his system and the commenter's system: the initial phase adjustment technique for resetting the programmable counter and prescaler is necessary to reestablish a phase-locked loop in a very short time after power is supplied to the VCO. However, if power is always supplied to the VCO, phase and frequency may be sustained by using only a sample-and-hold circuit.<>

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:38 ,  Issue: 10 )