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发明授权
US07990201B2 Constant phase digital attenuator with on-chip matching circuitry 有权
具有片上匹配电路的恒相数字衰减器

Constant phase digital attenuator with on-chip matching circuitry
摘要：
Various embodiments are directed to providing constant phase digital attenuation. In one embodiment, a digital attenuator circuit (100) comprises an input node (102) to receive an input signal to be attenuated, an output node (104) to output an attenuated signal, a reference loss path (106) between the input node (102) and the output node (104), and an attenuation path (108) between the input node (102) and the output node (104). The reference loss path (106) comprises switching elements and matching circuitry to improve Voltage Standing Wave Ratio (VSWR), and the attenuation path (108) comprises switching elements and attenuating circuitry to attenuate the input signal when the digital attenuator circuit (100) is switched from a reference loss state to an attenuation state. An effective phase length of the reference loss path (106) and an effective phase length of the attenuation path (108) may be equalized to provide a constant phase when the digital attenuator circuit (100) is switched between states.
摘要（中）：

各种实施例旨在提供恒定相数字衰减。 在一个实施例中，数字衰减器电路（100）包括用于接收待衰减的输入信号的输入节点（102），输出衰减信号的输出节点（104），输入节点 （102）和输出节点（104），以及在输入节点（102）和输出节点（104）之间的衰减路径（108）。 参考损耗路径（106）包括开关元件和匹配电路以改善电压驻波比（VSWR），并且衰减路径（108）包括开关元件和衰减电路，以在数字衰减器电路（100）为 从参考丢失状态切换到衰减状态。 当数字衰减器电路（100）在状态之间切换时，参考损耗路径（106）的有效相位长度和衰减路径（108）的有效相位长度可以相等以提供恒定相位。

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