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在很多情况下会得到两个正交相位模拟信号,但它们的相位需要调节才有用处,要不然需要对这两个正交相位模拟信号进行可变相位线性组合。由此引发了这种有关射频I-Q检测电路的设计思路。本设计可提供音频电压V_1=cos(ωt+θ)和V_2=sin(ωt+θ),但任意的相移θ在不同的应用中可以改变而且需要以简便而廉价的方法加以消除。递增的90°相移很容易用“信号路径选择”(信息交换和倒相)实现。然而,要产生较小的相移≤90°,通常最好把V_1和V_2与被乘数cos和sin线性组合在一起。这需要昂贵的余弦/正弦电位器和模拟乘法器或数字方法。
In many cases, two quadrature-phase analog signals are obtained, but their phase needs to be adjusted to be useful, otherwise a linear phase-shift combination of the two quadrature-phase analog signals is required. This led to such a radio frequency I-Q detection circuit design ideas. The design provides the audio voltages V_1 = cos (ωt + θ) and V_2 = sin (ωt + θ), but any phase shift θ can vary in different applications and needs to be eliminated in a simple and inexpensive way. An incremental 90 ° phase shift is easily achieved with “signal path selection” (information exchange and inversion). However, to produce smaller phase shifts ≤ 90 °, it is often best to combine V_1 and V_2 linearly with multiplicands cos and sin. This requires expensive cosine / sine potentiometers and analog multipliers or digital methods.