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Definition of "Meachem bridge" |
a bridge circuit where one of the arms (the reactance arm) is a series connection of an inductance, a capacitor, and a resistor, all three other arms are resistors. The Meachem bridge has a very steep phase frequency characteristics in the vicinity of the reactance arm resonance frequency. The steepness increases with higher Q-factor of the reactance arm and better tuning of the bridge balance at the resonance frequency. This combination of the bridge and reactance selectivity properties has secured the main application of the Meachem bridge as the feedback circuit of high precision crystal oscillators. |
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