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公开(公告)号：US20080094107A1
公开(公告)日：2008-04-24
申请号：US11583785
申请日：2006-10-20
申请人： Stephane Dallaire , Brian Glenn Wall , Shawn Lawrence Scouten , Colin Harvey Cramm , Kenji Suzuki , Stephen Alie , Andrew Deczky
发明人： Stephane Dallaire , Brian Glenn Wall , Shawn Lawrence Scouten , Colin Harvey Cramm , Kenji Suzuki , Stephen Alie , Andrew Deczky
IPC分类号： H03K5/22
CPC分类号： H03K5/2481 , H04L25/0292 , H04L25/03019 , H04L2025/03617
摘要： Signal magnitude comparison apparatus and methods are disclosed. A first input circuit receives a differential input signal and provides a first output signal based on a magnitude of the differential input signal. A second input circuit is operatively coupled to the first input circuit and is operable to receive a second input signal, which may also be a differential signal, and to provide a second output signal based on a magnitude of the second input signal. The operative coupling between the first and second input circuits results in the first output signal and the second output signal forming a differential output signal that is indicative of a difference between the magnitude of the first differential input signal and the magnitude of the second input signal.
摘要翻译： 公开了信号幅度比较装置和方法。 第一输入电路接收差分输入信号，并且基于差分输入信号的幅度提供第一输出信号。 第二输入电路可操作地耦合到第一输入电路并且可操作以接收第二输入信号，其也可以是差分信号，并且基于第二输入信号的幅度来提供第二输出信号。 第一和第二输入电路之间的操作耦合导致第一输出信号和第二输出信号形成差分输出信号，该差分输出信号指示第一差分输入信号的幅度与第二输入信号的大小之间的差异。
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2.发明授权Switchmode power converters for telephone subscriber line interface circuits 失效用于电话用户线接口电路的开关模式电源转换器
公开(公告)号：US5960075A
公开(公告)日：1999-09-28
申请号：US390715
申请日：1995-02-16
CPC分类号： H04M19/02 , H02M3/33576 , H04M19/001
摘要： A power converter forming part of a telephone subscriber line interface circuit selectively generates a ringing signal waveform, for supply to the line, or a supply voltage for a driver circuit for providing loop current on the line. First and second fixed frequency PWM signals are used to control the power converter, and hence the voltage which it generates, for the ringing signal waveform and the supply voltage respectively. The first PWM signal enables the power converter to provide a high power level needed for ringing signals. The second PWM signal has a lower frequency, and hence results in lower switching losses and power dissipation, and a lower duty cycle, suitable for the lower power level needed for the supply voltage, and is conveniently produced by masking pulses of the first PWM signal. The frequency of the second PWM signal is greater than 270 kHz, to avoid transmitting spectral energy to the line below this frequency.
摘要翻译： 形成电话用户线接口电路的一部分的功率转换器选择性地产生用于提供线路的振铃信号波形或用于在线路上提供回路电流的驱动器电路的电源电压。 第一和第二固定频率PWM信号用于分别为振铃信号波形和电源电压控制功率转换器，并因此控制其产生的电压。 第一个PWM信号使电源转换器能够提供振铃信号所需的高功率电平。 第二个PWM信号具有较低的频率，因此导致更低的开关损耗和功耗，以及更低的占空比，适合于电源电压所需的较低功率电平，并且通过屏蔽第一PWM信号的脉冲来方便地产生 。 第二个PWM信号的频率大于270 kHz，以避免将频谱能量传输到低于该频率的线路。
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