Differential LC voltage-controlled oscillator

专利名称：Differential LC voltage-controlled oscillator发明人：John E. Scoggins申请号：US09729002申请日：20001204

公开号：US20020113659A1公开日：20020822

专利附图：

摘要：A differential voltage-controlled oscillator (VCO) employs a pair of

accumulation-mode varactors driven with a differential control voltage to generate adifferential oscillating waveform. The differential control voltage is formed from a pair oflevel-shifted input differential control voltage components. Level shifting of the input

control voltages and driving the varactors with a differential control voltage allows forbiasing of the varactors over a substantial range of capacitance variation. Such differentialVCO may be employed within a phase-locked loop (PLL) circuit, with the pair of inputcontrol voltages being provided by the loop filter of the PLL circuit. The differential VCOcomprises a differential control voltage to voltage converter (CV2VC) coupled to an LC-tank VCO. To improve common-mode noise rejection of the LC-VCO, the inductors of theLC-tank may be AC-coupled to the supply voltage, and the output differential oscillatingwaveform may be AC-coupled to the LC-tank through capacitors.

申请人：SCOGGINS JOHN E.

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