CN202218220U

CN202218220U - Medium-frequency broadband receiver

Info

Publication number: CN202218220U
Application number: CN 201120301643
Authority: CN
Inventors: 杜浩钦; 郑艳英
Original assignee: Dfine Technology Co Ltd
Current assignee: Dfine Technology Co Ltd
Priority date: 2011-08-18
Filing date: 2011-08-18
Publication date: 2012-05-09
Anticipated expiration: 2021-08-18

Abstract

The utility model provides a medium-frequency broadband receiver, relates to the technical field of electronics, and aims to solve technical problems that a conventional product is low in integrated level, low in frequency stability, poor in phase noise and stray signal inhibition, low in stability, etc. A two-stage frequency conversion structure is adopted by the medium-frequency broadband receiver. A pre-select filter set is composed of a first filter 2 and a second filter 3. RF input radiofrequency signals pass through an amplitude limiter 1 and the pre-select filter set, then mode selection is carried out, and then frequency conversion is carried out twice. During frequency conversion, the amplification filtering processing is carried out for the signals, and finally 70MHz medium frequency signals are output.

Description

The intermediate frequency broadband receiver

Technical field

The utility model relates to electronic technology field, particularly a kind ofly is applied to the broadband receiver that civil aviation, space flight, maritime communication, scientific investigation are reconnoitred etc.

Background technology

Broadband receiver is parts crucial in the communication system; Numerous and complicated various along with the fast development of the communication technology and modern modulation system; Cause the degree of crowding of wireless frequency spectrum to be increasingly sharpened, the performance and the index of aspects such as the linearity of receiver, dynamic range, sensitivity, antijamming capability, adaptability proposed more and more harsher requirement.

The following weak point of existing intermediate frequency broadband receiver ubiquity:

1) integrated level is not high;

2) frequency stability is not high;

3) phase noise, spurious signal suppress bad;

4) stability is relatively poor.

Summary of the invention

The utility model is intended to solve that the traditional product integrated level is not high, frequency stability is not high, phase noise and spurious signal suppress not high-technology problem of bad, stability; With provide have stable and reliable for performance, integrated level is high, and good intermediate frequency broadband receivers of technical indicator such as frequency stability, phase noise, spurious signal inhibition.

The purpose of the utility model realizes through following technical scheme.

The intermediate frequency broadband receiver of the utility model, the input of amplitude limiter 1 connects outside input source, and its output connects single-pole double-throw switch (SPDT) 4 29 and singly goes into end, two inputs that go out to hold to connect respectively filter 1 and filter 23 of the latter; Single-pole double-throw switch (SPDT) 1 two go into the outputs that end connects filter 1 and filter 23, and what it went out singly that end connects SP3T switch 1 singly goes into end; Three of SP3T switch 1 goes out the input that end connects numerical-control attenuator 1, amplifier 1 and direct-connected line respectively; Three of SP3T switch 28 is gone into the output that end connects numerical-control attenuator 1, amplifier 1 and direct-connected line respectively, and what it went out singly that end is connected in series low pass filter 1, frequency mixer 1, band pass filter 1, amplifier 2 13, band pass filter 2 14, amplifier 3 15, low pass filter 2 16, frequency mixer 2 17, low pass filter 3 19, numerical-control attenuator 2 20, amplifier 4 21, numerical-control attenuator 3 22 and single-pole double-throw switch (SPDT) 2 23 in order singly goes into end; Two inputs that go out to hold to connect respectively filter 3 24 and filter 4 25 of single-pole double-throw switch (SPDT) 2 23; Single-pole double-throw switch (SPDT) 3 26 two go into the outputs that end connects filter 3 24 and filter 4 25, and it singly goes out end and is connected in series amplifier 5 27 and the outwards output of low pass filter 4 28 backs in order; Local oscillator 1 connects another input of frequency mixer 1, and local oscillator 2 18 connects another input of frequency mixer 2 17.

The beneficial effect of the utility model intermediate frequency broadband receiver:

1. stable and reliable for performance, integrated level is high;

2. technical indicators such as frequency stability, phase noise, spurious signal inhibition are good.

Description of drawings

The structure principle chart of Fig. 1 the utility model

Label declaration among the figure:

1 amplitude limiter; 2 filters one; 3 filters two; 4 single-pole double-throw switch (SPDT)s one; 5 SP3T switches one; 6 numerical-control attenuators one; 7 amplifiers one; 8 SP3T switches two; 9 low pass filters one; 10 frequency mixers one; 11 local oscillators one; 12 band pass filters one; 13 amplifiers two; 14 band pass filters two; 15 amplifiers three; 16 low pass filters two; 17 frequency mixers two; 18 local oscillators two; 19 low pass filters three; 20 numerical-control attenuators two; 21 amplifiers four; 22 numerical-control attenuators three; 23 single-pole double-throw switch (SPDT)s two; 24 filters three; 25 filters four; 26 single-pole double-throw switch (SPDT)s three; 27 amplifiers five; 28 low pass filters four; 29 single-pole double-throw switch (SPDT)s four

Embodiment

The utility model detailed structure, application principle, effect and effect with reference to accompanying drawing 1, are explained through following execution mode.

The input of the amplitude limiter 1 of the utility model connects outside input source, and its output connects single-pole double-throw switch (SPDT) 4 29 and singly goes into end, two inputs that go out to hold to connect respectively filter 1 and filter 23 of the latter; Single-pole double-throw switch (SPDT) 1 two go into the outputs that end connects filter 1 and filter 23, and what it went out singly that end connects SP3T switch 1 singly goes into end; Three of SP3T switch 1 goes out the input that end connects numerical-control attenuator 1, amplifier 1 and direct-connected line respectively; Three of SP3T switch 28 is gone into the output that end connects numerical-control attenuator 1, amplifier 1 and direct-connected line respectively, and what it went out singly that end is connected in series low pass filter 1, frequency mixer 1, band pass filter 1, amplifier 2 13, band pass filter 2 14, amplifier 3 15, low pass filter 2 16, frequency mixer 2 17, low pass filter 3 19, numerical-control attenuator 2 20, amplifier 4 21, numerical-control attenuator 3 22 and single-pole double-throw switch (SPDT) 2 23 in order singly goes into end; Two inputs that go out to hold to connect respectively filter 3 24 and filter 4 25 of single-pole double-throw switch (SPDT) 2 23; Single-pole double-throw switch (SPDT) 3 26 two go into the outputs that end connects filter 3 24 and filter 4 25, and it singly goes out end and is connected in series amplifier 5 27 and the outwards output of low pass filter 4 28 backs in order; Local oscillator 1 connects another input of frequency mixer 1, and local oscillator 2 18 connects another input of frequency mixer 2 17.

This receiver adopts the two-stage frequency conversion structure, and the preselection filter group is made up of filter 1 and filter 23, and RF input radio frequency signal is selected through the laggard row mode of preselection filter through amplitude limiter 1 and preselection filter group, carries out double conversion then; In the conversion process signal is carried out amplification filtering and handle, export the intermediate-freuqncy signal of 70MHz at last.

Amplitude limiter 1 protects mainly with preselection filter group purpose that whole passage is anti-to be burnt, and satisfies and suppresses image frequency and second-order intercept point requirement.Filter in the passage mainly is the leakage of the spuious and local oscillator of the high-order that brings when filtering mixing.

Claims

1. intermediate frequency broadband receiver; It is characterized in that: the input of amplitude limiter (1) connects outside input source; Its output connects single-pole double-throw switch (SPDT) four (29) and singly goes into end, and the latter two go out the input that end connects filter one (2) and filter two (3) respectively; Single-pole double-throw switch (SPDT) one (4) two go into the outputs that end connects filter one (2) and filter two (3), its singly go out end connect SP3T switch one (5) singly go into to hold; Three of SP3T switch one (5) goes out the input that end connects numerical-control attenuator one (6), amplifier one (7) and direct-connected line respectively; Three of SP3T switch two (8) is gone into the output that end connects numerical-control attenuator one (6), amplifier one (7) and direct-connected line respectively, its singly go out end be connected in series in order low pass filter one (9), frequency mixer one (10), band pass filter one (12), amplifier two (13), band pass filter two (14), amplifier three (15), low pass filter two (16), frequency mixer two (17), low pass filter three (19), numerical-control attenuator two (20), amplifier four (21), numerical-control attenuator three (22) and single-pole double-throw switch (SPDT) two (23) singly go into to hold; Single-pole double-throw switch (SPDT) two (23) two go out the input that end connects filter three (24) and filter four (25) respectively; Two outputs of going into to hold connection filter three (24) and filter four (25) of single-pole double-throw switch (SPDT) three (26), it singly goes out outwards exports after end is connected in series amplifier five (27) and low pass filter four (28) in order; Local oscillator one (11) connects another input of frequency mixer one (10), and local oscillator two (18) connects another input of frequency mixer two (17).