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FULLY DIFFERENTIAL CRYSTAL CLOCK GENERATOR

IP.com Disclosure Number: IPCOM000008540D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-21

Publishing Venue

Motorola

Related People

Authors:
Michael Cave Michael May

Abstract

Current implementations to squaring up a sine- wave from a crystal oscillator may be viewed in Figure I below (referred to as the prior art). Figure I, Prior Art I, being a single inverter, requires that the output swing of the crystal oscillator be large enough to trigger the inverter. In applications using Prior Art I to square up the crystal signal, the output swing of the crystal is generally rail-to-rail. This large voltage swing requires a large power dissipa- tion by the crystal which reduces the lifetime of the crystal or requires the crystal to cost more due to specifying a higher power dissipation. Therefore, a smaller voltage swing is desirable from the crystal oscillator, which leads to the Prior Art II shown in Figure I.