CN202261255U

CN202261255U - Multichannel multi-medium frequency array frequency conversion receiving apparatus

Info

Publication number: CN202261255U
Application number: CN2011203762174U
Authority: CN
Inventors: 冯晓东
Original assignee: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co Ltd
Current assignee: CHONGQING HUILING ELECTRON NEW TECHNOLOGY Co Ltd
Priority date: 2011-09-28
Filing date: 2011-09-28
Publication date: 2012-05-30
Anticipated expiration: 2021-09-28

Abstract

The utility model discloses a multichannel multi-medium frequency array frequency conversion receiving apparatus, characterized in that the receiving apparatus comprises a first conversion switch dividing signals into two independent frequency ranges; a preselection filtering amplifier filtering and amplifying various frequency ranges; a first mixer enabling an externally-input first local oscillation signal to be mixed; a first medium frequency filtering amplifier filtering signals and then amplifying the signals; a second conversion switch combining various independent frequency ranges; a second mixer enabling an externally-input second local oscillation signal to be mixed; and a second medium frequency filtering and amplifier filtering the signals and then amplifying and outputting the signals. The multichannel multi-medium frequency array frequency conversion receiving apparatus enables the system working frequency to be greatly reduced, the component cost to be greatly reduced, the component performance index to be increased, and the sensitivity, dynamic range and input cutoff point of a radio frequency microwave receiver to be remarkably improved; and the receiving apparatus not only can realize excellent frequency selection performance, but also can ensure the effective reception of weak signals.

Description

A kind of many intermediate frequencies of multichannel array frequency conversion receiving system

Technical field

The utility model relates to a kind of many intermediate frequencies of multichannel array frequency conversion receiving system.

Background technology

At present, what general general reception technique adopted is traditional high intermediate frequency secondary heterodyne frequency changing method, and single-conversion main devices maximum operating frequency is about 2.5～3FH; Not only the receiver technical indicator is difficult to guarantee that the device price is also higher, and many intermediate frequencies of multichannel frequency conversion scheme main devices maximum operating frequency is about 1.2～1.5FH; Can adopt general-purpose device; Realize that integrated cost is also low easily, wherein FH is the highest frequency that receiver receives.

The utility model content

The purpose of the utility model provides low, effective many intermediate frequencies of the multichannel array frequency conversion receiving system of a kind of cost.

To achieve these goals, adopt following technical scheme, a kind of many intermediate frequencies of multichannel array frequency conversion receiving system is characterized in that: said receiving system comprises successively and to connect

First transforms switch, and signal is divided at least two independently frequency ranges;

The preliminary election filter amplifier carries out filtering and processing and amplifying with each frequency range;

First frequency mixer mixes with first local oscillation signal of external world's input;

The first intermediate frequency filtering amplifier device carries out amplifying behind the intermediate frequency filtering to signal;

Second transforms switch, with each independently frequency range make up;

Second frequency mixer mixes with second local oscillation signal of external world's input;

The second intermediate frequency filtering amplifier carries out amplifying output behind the intermediate frequency filtering to signal.

For noise-decreasing, the protection components and parts are provided with the radio frequency programmable attenuator that strong signal is decayed before the said first conversion switch.

Be provided with the amplitude limiter that the radiofrequency signal that receives is carried out amplitude limit before the said radio frequency programmable attenuator.

The utility model reduces the operating frequency of system greatly; Can reduce device cost greatly and improve the device performance index; On low-frequency range, can realize more performance like the big dynamically devices such as amplifier, high performance filter, frequency mixer of low noise; Thereby can significantly improve sensitivity, the dynamic range of frequency microwave receiver, and input section; Can realize excellent frequency-selecting performance, can guarantee effective reception again, simultaneously,, be easy to product engineering production because design debug is simple to small-signal.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is further specified.

As shown in Figure 1; Be connected to the radio frequency programmable attenuator after the frequency microwave signal process amplitude limiter protection from antenna; Can decay with protection subsequent conditioning circuit safety to strong excessively signal, be provided with first according to signal frequency by control unit then and transform switch, be connected to corresponding link and carry out filtering and processing and amplifying; Carry out first mixing then; The intermediate-freuqncy signal of exporting be connected to corresponding second later on through filtering, processing and amplifying and transform on the switch, second transforms switch output signal carries out secondary mixing and handles at the second frequency mixer place, resulting second intermediate-freuqncy signal is connected to final output later on through further filter amplifying processing.

The utility model adopts high performance preselection filter; Received frequency microwave signal is divided into a plurality of independently passages according to the actual frequency coverage; Each frequency band signals has been divided into a plurality of independently frequency ranges and has carried out frequency conversion; Thereby realize the frequency conversion of many intermediate frequencies of multichannel array, successfully solved the defective of high intermediate frequency secondary heterodyne technology.

Claims

1. many intermediate frequencies of multichannel array frequency conversion receiving system is characterized in that: said receiving system comprises and connecting successively

Second transforms switch, with each independently frequency range make up;

2. many intermediate frequencies of multichannel array frequency conversion receiving system as claimed in claim 1 is characterized in that: be provided with the radio frequency programmable attenuator that strong signal is decayed before the said first conversion switch.

3. many intermediate frequencies of multichannel array frequency conversion receiving system as claimed in claim 2 is characterized in that: be provided with the amplitude limiter that the radiofrequency signal that receives is carried out amplitude limit before the said radio frequency programmable attenuator.