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An integrated CMOS image-rejection mixer system for low-jitter secondary frequency references

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2 Author(s)
Wegerif, S. ; Philips Semiconductors, Southampton, UK ; Redman-White, W.

In complex mixed-signal system ICs there is usually the need for several clock frequencies, sometimes not frequency or phase related. The technique of simple phase-locked loop (PLL) designs places constraints on reference signal tracking and jitter performance. A subsystem designed to give a low-jitter high frequency reference clock from a low frequency PLL, without modifying loop dynamics or multiplying the frequency variations, is described. A CMOS integrated image rejection mixer system is presented using I and Q channel modulators and filters operating in the current domain. Rejection of the unwanted products is better than 35 dB and, from a 1.5 MHz signal with 20 ns p-p jitter, the output has less than 3 ns p-p at 15 MHz

Published in:

Circuits and Systems, 1993., ISCAS '93, 1993 IEEE International Symposium on

Date of Conference:

3-6 May 1993

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