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

Active Publication Date: 2012-09-26
CHENGDU JIUHUA YUANTONG TECH DEV
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Although this solution has a simple structure and low cost, it has

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  • Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index
  • Second local oscillator circuit of ultra short wave receiver with low-power consumption and high phase noise index

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Embodiment Construction

[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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Abstract

The invention discloses a second local oscillator circuit of an ultra short wave receiver with low-power consumption and high phase noise index, which consists of a low pass filter LPF1, a phase-locked loop, an amplifier LNA, a low pass filter LPF2 and a power divider. The phase-locked loop comprises a phase discriminator PD, a low pass filter LPF3 and a voltage controlled oscillator VCO which are all connected in to each other in sequence. One output of the voltage controlled oscillator VCO passes through the amplifier LNA and the low pass filter LPF2 in turn to connect with an input of the power divider. Another output of VCO goes through the high pass filter HPF to connect with the input end of the local oscillator signal of the phase discriminator PD. The voltage controlled oscillator VCO passes through a high pass filter HPF to connect with a local oscillation signal input end of the phase discriminator PD.The invention employs a phase-locked loop mode and positions thehigh pass filter on a feedback loop of the voltage controlled oscillator VCO, which improves the stray inhibition capability and anti-interference capability of the local oscillator circuit. By front and back filtering, the phase noise of the output signal is reduced and the output signal-to-noise ratio is improved. Furthermore, this local oscillator circuit is also characterized by a simple structure, low consumption and low cost.

Description

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Claims

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Application Information

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Owner CHENGDU JIUHUA YUANTONG TECH DEV
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