CN201821319U

CN201821319U - Ku-BAND double-local oscillator single output low-noise frequency demultiplier

Info

Publication number: CN201821319U
Application number: CN2010205216391U
Authority: CN
Inventors: 宋迪龙; 张建霞
Original assignee: CHENZHOU XIDIAN TECHNOLOGY Co Ltd
Current assignee: CHENZHOU XIDIAN TECHNOLOGY Co Ltd
Priority date: 2010-09-01
Filing date: 2010-09-01
Publication date: 2011-05-04
Anticipated expiration: 2020-09-01

Abstract

The utility model relates to a Ku-BAND double-local oscillator single output low-noise frequency demultiplier which belongs to a satellite direct broadcasting signal processing and transmitting device. An integrated chip 3560IC (integrated circuit) is adopted for integrating a frequency mixing circuit, a local oscillation circuit and a medium-frequency amplifier circuit. A mirror-phase inhibition circuit is also simultaneously integrated in an integrated block. A U-shaped bandpass filter circuit can be eliminated. By adopting the frequency demultiplier, the phase noise of the product can be improved, and the design of a PCB (printed circuit board) can simultaneously greatly reduce the space.

Description

The two local oscillator single channel output of Ku-BAND lnb

Technical field

The present invention relates to a kind of direct broadcasting satellite signal processing transmitting device, relate in particular to the two local oscillator single channel output of a kind of Ku-BAND lnb.

Background technology

The domsat live signal is mainly linear polarization C-BAND signal at present.But external direct broadcasting satellite signal mainly is a linear polarization Ku-BAND signal, domestic launched in No. 9 live stars, with circular polarization Ku-BAND beam transmission.Country is carrying out the satellite television project of "Communication with Every Village" now, thus can affirm say that Ku-BAND frequency demultiplier future prospects for development is limitless.

The internal circuit flow chart of conventional on the market Ku-BAND frequency demultiplier product as shown in Figure 1 now, its signal flow is: level (H) polarizes radiofrequency signal by being coupled in the PCB circuit by two co-wavelength coupling probes respectively with vertical (V), the H/V polarization is put through the one-level height respectively, put by the public height in the second level again, through " U " type band pass filter, two local oscillator mixing, low pass filter adopts in the two-stage at last and puts.For give the first order and for the second time height put bias voltage be provided.Will increase biasing control chip L3211IC in the middle of this product also has control to choose the function of LOW/Hi wave band work.So just increased the design space of PCB.In order to choose the RF signal that needs: 10.7-12.75GHz, this product have adopted " U " type band pass filter to filter unwanted noise signal.Such filter requires mask-making technology very high, and homogeneity of product is not so good.Noise signal also has no idea to filter fully.The noise signal that does not filter simultaneously and need RF signal amalgamation sample and local oscillator mixing.And easy production self-excitation phenomena.Difference frequency signal will be by being only IF signal: 950-2150MHz behind the low pass filter.Adopt the low pass filter purpose to have two, the one, suppress high frequency and pass through, the 2nd, filter unnecessary noise signal.Adopt in the two-stage at last and put.Main purpose is the gain that strengthens intermediate-freuqncy signal, at last with F type female joint output intermediate-freuqncy signal.Such scheme requires the design practitioner to have working experience for many years, needs a reasonable product of quite meticulous ability output of design.

Summary of the invention

Technical problem to be solved by this invention is: remedy the deficiencies in the prior art, propose the two local oscillator single channel output of a kind of Ku-BAND lnb, adopt integrated chip 3560IC to integrate mixing, local oscillator and intermediate level circuit.Simultaneously in the integrated package also integrated mirror suppress circuit mutually.So can save " U " type band pass filter circuit.Improve the product phase noise, simultaneously corresponding pcb board design can reduce very big space.

In order to address the above problem, technical scheme of the present invention is: the two local oscillator single channel output of a kind of Ku-BAND lnb, level (H) polarizes radiofrequency signal by being coupled in the PCB circuit by two co-wavelength coupling probes respectively with vertical (V), the H/V polarization is put through the one-level height respectively, put by the public height in the second level, mixing, local oscillator and the intermediate level circuit of back level is to adopt the 27MHz frequency multiplication to add integrated chip 3560IC PHASE-LOCKED LOOP PLL TECHNIQUE to produce again; Local oscillating frequency is 9.75GHz/10.6GHz, with identification of " 0/22K " pulse signal and the work of control local oscillation circuit; Simultaneously in the integrated chip also integrated mirror suppress circuit mutually; The independent height of the horizontal polarization of above-mentioned one-level Gao Fangzhong (H) and perpendicular polarization (V) is not put and is worked simultaneously, is to switch by input offset operation voltage 13V/18V control; Promptly import offset operation voltage 18V, then horizontal polarization (H) work, input offset operation voltage 13V, perpendicular polarization (V) work.

Compared with the prior art: the present invention adopts integrated chip 3560IC phase-locked loop circuit to add the 27MHZ frequency doubling technology, save the control of rf bias voltage and 0/22K pulse signal and switched L3211IC, integrated mixing, local oscillator and intermediate-frequency circuit, simultaneously also integrated mirror suppresses circuit mutually.So saved " U " type band pass filter circuit, chip also has the clutter reduction semiotic function.By the output of IF PUTOUT port is exactly IF signal: 950-2150MHz.At last with F type female joint output intermediate-freuqncy signal.Reduce the cost that satellite receives by above conceptual design, benefited the ordinary people, promoted the industrialized development of direct satellite broadcasting TV cause to a certain extent.The topmost characteristics of this conceptual design also have:

(1) improved product phase noise :-70dBc/1KHz ,-90dBc/10KHz ,-105dBc/100KHz.The phase noise of conventional products is :-50dBc/1KHz ,-70dBc/10KHz ,-90dBc/100KHz.

(2) improve L ₀Frequency stability: @-40 ℃ of ± 300KHz @25 ℃ of (room temperature) ± 500KHz ^-+ 60 ℃.The L of conventional products ₀Frequency stability: @-40 ℃ of ± 1MHz @25 ℃ of (room temperature) ± 3MHz ^-+ 60 ℃.

(3) reduced the noise factor of product: 0.5dB (Typ), 1.0dB (max), the noise factor of conventional products: 0.7dB (Typ), 1.5dB (max).

(4) gain of raising product: 60dB (@25 ℃ of 55dB of TYP) (min), the gain of conventional products: 55dB (@25 ℃ of 50dB of TYP) (min).

(5) improve product be designed to power and the construction cycle has been lacked in the place, also improve technical target of the product and stability simultaneously.

(6) the pcb board design can reduce very big space.The metal chassis structural member obtains also that changing of maximum space is little, and volume is little, compares in like product and can save 1/3 size, has alleviated the weight of casing.Promoted product structure.Greatly reduce a whole set of cost of frequency demultiplier.

Description of drawings

Fig. 1 is prior art constructions figure.

Fig. 2 is a structure chart of the present invention.

Embodiment

Below in conjunction with accompanying drawing 2, will do detailed description to the present invention with concrete execution mode:

The two local oscillator single channel output of a kind of Ku-BAND lnb, level (H) polarizes radiofrequency signal by being coupled in the PCB circuit by two co-wavelength coupling probes respectively with vertical (V), the H/V polarization is put through the one-level height respectively, put by the public height in the second level, mixing, local oscillator and the intermediate level circuit of back level is to adopt the 27MHz frequency multiplication to add integrated chip 3560IC PHASE-LOCKED LOOP PLL TECHNIQUE to produce again; Local oscillating frequency is 9.75GHz/10.6GHz, with identification of " 0/22K " pulse signal and the work of control local oscillation circuit; Simultaneously in the integrated chip also integrated mirror suppress circuit mutually; The independent height of the horizontal polarization of above-mentioned one-level Gao Fangzhong (H) and perpendicular polarization (V) is not put and is worked simultaneously, is to switch by input offset operation voltage 13V/18V control; Promptly import offset operation voltage 18V, then horizontal polarization (H) work, input offset operation voltage 13V, perpendicular polarization (V) work.

The signal flow of product of the present invention is: level (H) polarizes radiofrequency signal by being coupled in the PCB circuit by two co-wavelength coupling probes respectively with vertical (V), and the H/V polarization is put through first order height respectively, puts by the public height in the second level again.All RF signals have all carried out two-stage low noise processing and amplifying, directly import integrated chip 3560IC phase-locked loop circuit.Chip adds 27MHz crystal oscillator frequency multiplier circuit and produces local oscillating frequency: 9.75GHz and 10.6GHz. automatically because chip does not provide the offset operation voltage of first order horizontal polarization Gao Fangguan (H) and perpendicular polarization Gao Fangguan (V) simultaneously, thereby has controlled V/H polarization switching.Suppress circuit mutually owing to carry ytterbium in the chip in addition. choose the RF signal of our needs: 10.7-12.75GHz automatically.So save Design of Bandpass at radio circuit.Noise signal has effectively been curbed.This chip also has identification and control " 0/22K " pulse signal function to be used for control to choose LOW/Hi wave band working condition, when " 0 " pulse signal, be the work of 9.75GHZ local oscillation circuit, when " 22K " pulse signal, be the work of 10.6GHz local oscillation circuit, so just prevented the difference frequency interference phenomenon.

Claims

1. the two local oscillator single channel of Ku-BAND are exported lnb, level (H) polarizes radiofrequency signal by being coupled in the PCB circuit by two co-wavelength coupling probes respectively with vertical (V), the H/V polarization is put through the one-level height respectively, put by the public height in the second level, it is characterized in that: mixing, local oscillator and the intermediate level circuit of back level is to adopt the 27MHz frequency multiplication to add integrated chip 3560IC PHASE-LOCKED LOOP PLL TECHNIQUE to produce; Local oscillating frequency is 9.75GHz/10.6GHz, with identification of " 0/22K " pulse signal and the work of control local oscillation circuit; Simultaneously in the integrated chip also integrated mirror suppress circuit mutually; The independent height of the horizontal polarization of above-mentioned one-level Gao Fangzhong (H) and perpendicular polarization (V) is not put and is worked simultaneously, is to switch by input offset operation voltage 13V/18V control; Promptly import offset operation voltage 18V, then horizontal polarization (H) work, input offset operation voltage 13V, perpendicular polarization (V) work.