PLL filter
A filter and limiter technology, applied in the field of radio frequency PLL filters, can solve the problems of nonlinear distortion of the output signal, high linearity requirements, error vector magnitude, etc., to reduce chip power consumption, avoid nonlinear distortion, The effect of saving chip area
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[0011] A specific embodiment of the PLL filter of the present invention is as figure 2 As shown, only one radio frequency local oscillator signal (RF LO) needs to be provided from the outside. The frequency of this signal is the same as the final desired RF output frequency, which is selected around 900MHz. The local oscillator signal enters the local oscillator driver module of the PLL filter to improve its Drive capability, and perform phase shift operation at the same time to generate two orthogonal RF local oscillator signals, and then through the quadrature mixer, the I and Q components of the baseband signal provided by the external analog baseband chip are up-converted, and modulated to the RF carrier Frequency modulation signal, the modulation signal is directly used as an input of the radio frequency limiter, and the other input of the radio frequency limiter is directly fed back from the 900MHz radio frequency signal output by the differential voltage controlled osci...
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