| 摘要 |
A frequency doubler circuit arrangement comprises a full wave rectifier circuit having an input and a first terminal, the first terminal being connected to a first supply terminal via a first current source, and the input forming an input of the frequency doubler circuit arrangement. A biased transistor circuit is also provided, having a first terminal connected to the first supply terminal via a second current source and being connected to the first terminal of the rectifier circuit. Output terminals of the rectifier circuit and the biased transistor circuit form differential output terminals of the frequency doubler circuit arrangement. The respective outputs of the rectifier circuit and the biased transistor circuit may be connected to a second supply terminal via either an active filter load or a passive filter load, such as an inductance-capacitance-resistance filter. Such a frequency doubler circuit may be employed in a radiotelephone device such that a single voltage controlled oscillator may be utilized to provide signal sources at more than one operating frequency.
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