Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index
A technology of noise index and local oscillator circuit, applied in electrical components, transmission systems, etc., can solve the problems of high power consumption and small margin of phase noise index, achieve low power consumption, reduce phase noise, and improve spurious suppression ability and the effect of anti-jamming capability
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[0013] Further describe the technical scheme of the present invention below in conjunction with accompanying drawing: as figure 1 As shown, the second local oscillator circuit of the ultrashort wave receiver with low power consumption and high phase noise index is composed of a low-pass filter LPF1, a phase-locked loop, an amplifier LNA, a low-pass filter LPF2 and a power divider, wherein the amplifier LNA ERA-5SM chip is adopted, low-pass filter LPF2 adopts LFCN-3400 chip; the power splitter is one-to-eight power splitters, in which three frequency outputs are grounded through resistors, and the other five output frequencies are 3450-3550MHz, P≥0dBm local oscillator signal. The phase-locked loop includes a phase detector PD, a low-pass filter LPF3 and a voltage-controlled oscillator VCO connected in sequence, wherein the phase detector PD adopts the HMC704 chip, and the voltage-controlled oscillator VCO adopts the V844LE02-LF chip. The input of the low-pass filter LPF1 is co...
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