On the speed-up of lock up time in the PLL frequency synthesizer

Authors: Sumi Y.; Obote S.; Tsuda K.; Syoubu K.; Fukui Y.

Source: International Journal of Electronics, Volume 84, Number 2, 1 February 1998 , pp. 123-130(8)

Publisher: Taylor and Francis Ltd

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Abstract:

A new speed-up method of lock up time is proposed for the phase locked loop (PLL) frequency synthesizer in the local oscillation circuit of a radio receiver. Doubling of reference frequency is achieved by using a new (N + 1/2) programmable divider which enables a half division ratio, compared with that of a conventional divider, and it leads to a bigger loop gain K and the speed-up of lock up time. The experimental results of lock up time will be given together with the spectrum of the output frequency.

Language: English

Document Type: Research article

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