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US07643600B2 Techniques for performing gain and phase correction in a complex radio frequency receiver 失效
在复杂射频接收机中执行增益和相位校正的技术

Techniques for performing gain and phase correction in a complex radio frequency receiver
Abstract:
A receiver (300) includes a first mixing digital-to-analog converter (DAC) (336, 332), a second mixing DAC (338, 334), a direct digital frequency synthesizer (DDFS) (302), a phase correction circuit (340), a selectable load (306) and a magnitude correction circuit (350). The first mixing DAC (336, 332) includes a first input for receiving an input signal, a second input for receiving a digital first local oscillator (LO) signal and an output. The second mixing DAC (338, 334) includes a first input for receiving the input signal, a second input for receiving a digital second local oscillator (LO) signal and an output. The DDFS (302) is configured to provide the first and second LO signals, which are quadrature signals. The phase correction circuit (340) is configured to provide a phase correction signal to a control input of the DDFS (302). The first selectable load (306) includes an input coupled to the output of the first mixing DAC (336, 332) and a control input. The magnitude correction circuit (350) is configured to provide a first magnitude correction signal to the control input of the first selectable load (306).
Abstract(Chinese):

接收器（300）包括第一混合数模转换器（DAC）（336,332），第二混合DAC（338,334），直接数字频率合成器（DDFS）（302），相位校正电路 （340），可选负载（306）和幅度校正电路（350）。 第一混合DAC（336,332）包括用于接收输入信号的第一输入端，用于接收数字第一本地振荡器（LO）信号和输出的第二输入端。 第二混合DAC（338,334）包括用于接收输入信号的第一输入端，用于接收数字第二本机振荡器（LO）信号和输出的第二输入端。 DDFS（302）被配置为提供作为正交信号的第一和第二LO信号。 相位校正电路（340）被配置为向DDFS（302）的控制输入提供相位校正信号。 第一可选择负载（306）包括耦合到第一混合DAC（336,332）的输出和控制输入的输入。 幅度校正电路（350）被配置为向第一可选择负载（306）的控制输入端提供第一幅度校正信号。

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