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Quadrature oscillator having amplitude control means based on a trigonometric identity
Quadrature oscillator having amplitude control means based on a trigonometric identity
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机译:具有基于三角恒等式的幅度控制装置的正交振荡器
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摘要
A quadrature oscillator includes an amplitude control circuit that is based upon the trigonometric identity sin.sup.2 &ohgr;t+cos.sup.2 &ohgr; t=1. The amplitude control circuit, referred to as a Pythagorator, includes two squaring circuits. Each squaring circuit receives a respective quadrature oscillator signal and squares it. The outputs of the two squaring circuits are joined together so as to sum the outputs of the two squaring circuits to produce a sum of squares signal. This signal, a current in the preferred embodiment, is provided to damping diodes coupled to the outputs of the quadrature oscillator. The damping diodes produce a shunt positive resistance at the outputs of the quadrature oscillator in response to this current that has the effect of cancelling the shunt negative resistance of the regenerative elements of the oscillator thereby establishing the amplitude of the quadrature oscillator signals at a desired amplitude.
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机译:正交振荡器包括一个振幅控制电路,该电路基于三角标识sin.sup.2&ohgr; t + cos.sup.2&ohgr; 2。 t = 1。振幅控制电路称为Pythagorator,包括两个平方电路。每个平方电路接收相应的正交振荡器信号并将其平方。将两个平方电路的输出连接在一起,以便对两个平方电路的输出求和以产生平方和信号。该信号,在优选实施例中为电流,被提供给耦合到正交振荡器的输出的阻尼二极管。响应于该电流,阻尼二极管在正交振荡器的输出端产生分流正电阻,其作用是抵消振荡器再生元件的分流负电阻,从而将正交振荡器信号的幅度确定为所需幅度。 。
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