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61. 发明授权

US5329258A Multilevel FSK modulator having phase locked loop with controlled transient response 失效
标题翻译：多级FSK调制器具有控制瞬态响应的锁相环
公开(公告)号：US5329258A
公开(公告)日：1994-07-12
申请号：US77723
申请日：1993-06-16
申请人： Takashi Matsuura
发明人： Takashi Matsuura
IPC分类号： H04L27/12
CPC分类号： H04L27/12 , H04L27/106
摘要： A multilevel frequency-shift keying (FSK) modulator is disclosed in which the transient response for frequency transition can be easily set. The modulator is of a type in which a frequency generated by a voltage-controlled oscillator (VCO) is changed in accordance with multilevel code and is phase-locked by a phase-locked loop (PLL). The modulator is provided with a phase-lock feedback circuit that, combined with a VCO, makes up a PLL, and includes first and second VCOs and a filter having a desired transient response characteristic. At a transient time of frequency transition due to a change of the multilevel code, the first VCO and feedback circuit makes up the PLL, and a first control voltage for the first VCO produced in the PLL is inputted as a second control voltage to the second VCO through the filter. Accordingly, the FSK signal delivered from the second VCO has a transient response characteristic depending on the characteristic of the filter, and as a result, the transient response characteristic of the FSK modulator can be set to a desired characteristic by modifying the characteristic of the filter without changing the other circuit parameters.
摘要翻译：公开了一种多电平频移键控（FSK）调制器，其中可以容易地设置用于频率转换的瞬态响应。调制器是一种类型，其中由压控振荡器（VCO）产生的频率根据多电平码而改变，并被锁相环（PLL）锁相。该调制器设置有与VCO组合的锁相反馈电路，其组成PLL，并且包括第一和第二VCO以及具有期望的瞬态响应特性的滤波器。在多级代码的变化的频率转变的瞬时时间，第一VCO和反馈电路构成PLL，并且在PLL中产生的第一VCO的第一控制电压作为第二控制电压被输入到第二控制电压 VCO通过滤波器。因此，从第二VCO输出的FSK信号具有取决于滤波器的特性的瞬态响应特性，结果，可以通过修改滤波器的特性来将FSK调制器的瞬态响应特性设置为期望的特性而不改变其他电路参数。

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