Start-up circuit for single-pin crystal oscillators
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United States of America Patent
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Oct 20, 2020
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app pub date -
Nov 30, 2018
filing date -
Nov 30, 2018
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Abstract
An oscillator start-up circuit and methodology for oscillator start-up is disclosed. The circuit includes a reference bias switch coupled to a reference node and a load node of a transconductor of an oscillator. The reference bias switch is responsive to a control signal for start-up of the oscillator and operable to close at a first time prior to start-up of the oscillator to maintain a voltage at the reference node equal to a voltage at the load node prior to application of bias to the transconductor. The reference bias switch is further operable to open at a second time subsequent to the first time. In one embodiment, a separate reference bias voltage is applied to a reference node of the transconductor.
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