A Fast Start-Up Circuit for Crystal Oscillators

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  • 水晶発振回路の起動高速化回路
  • スイショウ ハッシン カイロ ノ キドウ コウソクカ カイロ

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Abstract

This paper presents a fast start-up crystal oscillator circuit. The start-up time depends on the characteristics of the negative resistance of the oscillator circuit. The negative resistance varies in proportion to the emitter bias current. In proposed circuit, the emitter bias resistance is replaced by the control current source and the negative resistance is controlled much bigger than that of the usual oscillator in the initial start-up time by controlling the emitter current. The simulation shows the reduction of the start-up time about one seventh to the usual oscillator circuit.

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