KR970055244A - Improved Frequency Inverter of Satellite Receiver - Google Patents

Abstract

The present invention relates to an improved frequency converter of a satellite receiver, wherein a microwave signal received through a receiving antenna is primarily amplified by a low noise amplifier, filtered through a first BPF, and a stable frequency oscillation frequency provided from PLDRVCO. Mixed in a first frequency mixer, filtered through a second BPF, and then mixed in a second frequency mixer with a stable frequency oscillation frequency provided from PLDRVCO, filtered through a third BPF, and then amplified to a predetermined size through an RFA, followed by an RF signal. Is converted. At this time, the oscillation frequency provided from the DRVCO in the PLDRVCO to the first frequency mixer and the second frequency mixer is adjusted based on the DC component in the voltage waveform according to the phase difference detected by the phase detection unit, and thus the oscillation frequency having a stable frequency provided from the PLDRVCO. By converting the microwave signal into an RF signal, it is possible to improve not only 10,000 times more in terms of frequency stability but also more than 30 dB in terms of phase noise compared to the frequency conversion using the oscillation frequency provided from the DRO. I would have to.

Description

Improved Frequency Inverter of Satellite Receiver

Since this is an open matter, no full text was included.

1 is a schematic block diagram of an improved frequency converter of a satellite receiver according to a preferred embodiment of the present invention.

Claims (1)

Low noise amplifying means 110 for amplifying the microwave signal to a predetermined size, first filtering means 120 for filtering the signal amplified by the low noise amplifying means 110 to a frequency of a predetermined frequency band, First and second oscillation means (130,160) for generating an oscillation frequency having each predetermined frequency set, the signal filtered by the first filtering means 120 and the oscillation provided from the first oscillation means (130) A first frequency mixing means 140 for mixing frequencies, a second filtering means 150 for filtering signals mixed in the first frequency mixing means 140 to frequencies of different frequency bands, and the first The second frequency mixing means 170 for mixing the signal filtered by the second filtering means 150 and the oscillation frequency provided from the second oscillating means 160 and the second frequency mixing means 170 are mixed. God Is a frequency conversion device comprising a third filtering means 180 for filtering to a frequency of another set frequency band, and an amplifying means 190 for amplifying a signal filtered by the third filtering means 180 to a predetermined size. In the first and second oscillation means (130,140) is: DRVCO (210) which is constantly adjusted based on the DC component, and generates an oscillation frequency having the set predetermined frequency: generated in the DRVCO (210) Dispensing means (220,230) for dividing the oscillation frequency by a predetermined frequency; Reference frequency oscillating means 240 for generating an oscillation frequency of a set reference frequency; Phase detection means (250) for detecting a phase difference between the oscillation frequency divided by the division means (220, 230) and an oscillation frequency having a reference frequency generated by the reference frequency oscillation means (240); And a loop filter means (260) for providing the DC component to the DRVCO (210) in the voltage waveform according to the phase difference detected by the phase detection means (250). ※ Note: The disclosure is based on the initial application.