CN204068946U

CN204068946U - A kind of radio transmitter circuit based on door

Info

Publication number: CN204068946U
Application number: CN201420614502.9U
Authority: CN
Inventors: 黄远航
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-23
Filing date: 2014-10-23
Publication date: 2014-12-31
Anticipated expiration: 2024-10-23

Abstract

The utility model discloses a kind of radio transmitter circuit based on door, by gate oscillator, shaping buffer, high-voltage power door forms, the modulated terminal of audio signal input gate oscillator, become two-way through shaping buffer allocation, drive the high side pipe of high-voltage power door and low side pipe respectively, then be compound to output via antenna transmission electromagnetic wave.Whole circuit is made up of door, is operated on off state, stable and reliable for performance, and without the need to interstage sheilding, adjust without the need to sky, rear class is removed LC loop from and do not produced DC component, and pipe consumption is little, and efficiency is high, is applicable to beginner, or installs under amateurish condition and make.

Description

A kind of radio transmitter circuit based on door

Technical field

The utility model relates to a kind of radio transmitter circuit, particularly relates to a kind of efficient radio radiating circuit based on door.

Background technology

Common radio transmitter circuit is formed based on transistor, generally comprises master-oscillator, preamplifier stage and power amplifier level.Transistor, must biasing circuit at dynamic area, and chooses a suitable working point, needs debugging.High-frequency signal is easily revealed, and inter-stage often can be caused to disturb, as produced self-excitation, the phenomenons such as crosstalk, for ensureing that inter-stage isolation implemented by the stable radome that must at different levelsly install additional of circuit working.Rear class power amplifier level, mostly is C class and E class power amplifier, although power tube is operated on off state, needs a LC loop and does load.Adjustment LC loop and antenna loop must make its resonance, just can enter good working order, adjust and improperly can produce DC component and standing wave, be easy to burn out power tube.Therefore debugging radiating circuit becomes a professional very strong job, needs debugging person to have rich experience, and just can complete under the instrument of specialty will be had to coordinate.Its work is large, and difficulty neither generally beginner can be grasped.

Summary of the invention

For above-mentioned deficiency, the utility model provides a kind of radio transmitter circuit based on door, and this circuit theory is simple, stable and reliable for performance, each inter-stage still can ensure normal work without the need to radome isolation, is convenient to install, do a small amount of debugging and even exempt from debugging, antenna transmission can be gone up.

In order to solve the problem, the utility model is achieved through the following technical solutions:

A kind of radio transmitter circuit based on door, comprise gate oscillator, shaping buffer, high-voltage power door forms, it is characterized in that: the modulated terminal of audio signal input gate oscillator, become two-way through shaping buffer allocation, drive the high side pipe of high-voltage power door and low side pipe respectively, then be compound to output via antenna transmission electromagnetic wave.

Advantageous Effects of the present utility model is: exempt from sky adjust, working stability, rear class belong to recommend export be well suited for the such capacitor type load of image antenna, remove LC loop from, do not produce DC component, pipe consumption is little, efficiency is high, is applicable to beginner, or installs under amateurish condition and make.

accompanying drawing explanation

Fig. 1 is system framework figure of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with Figure of description, the utility model is described in further detail:

As Fig. 2, by U1, U2 two not gates and crystal oscillator Y1, shunt capacitance C1, C2, coupling capacitance C3 forms gate oscillator, and wherein A point is the modulated terminal of gate oscillator, and audio signal holds input thus.The centre frequency of main circuit vibration frequency is determined by crystal oscillator Y1, can because of the voltage levels of input audio signal slightly deviation formation frequency deviation.After circuit starting of oscillation, export high frequency quasi-square wave at B point, its amplitude a little less than 5V, through U3, U4 two Schmidt trigger shapings are also distributed into living two-way standard block, and frequency is master oscillator frequenc, duty ratio 50%, high level+5V, low level 0V, deliver to C point and C' point respectively.After capacitive coupling, its amplitude preservation is constant, is still 5V, and the low level of D point by D1 diode clamp at-0.7V; The high level of D' point is by D2 diode clamp at+HV+0.7V, and concrete analysis process sees below.

The high-voltage power door of rear class is made up of two complementary high voltagehigh frequency high-power MOS tubes (Q1, Q2), and Q1 is N-MOS pipe, and Q2 is P-MOS pipe.

When C point is low level (0V), through C5 coupling, after D1 diode clamp, D point is that the G-S interpolar of-0.7V, Q1 exists reverse voltage 0.7V, and Q1 ends; Simultaneously C' point is similarly low level (0V), and after C6 is coupled, D' point is that the G-S interpolar of+HV-4.3V, Q2 exists forward voltage 4.3V, Q2 conducting, and the voltage being compounded in E point is+HV.

When C point is high level (+5V), through C5 coupling, D point is that the G-S interpolar of+4.3V, Q1 exists forward voltage 4.3V, Q1 conducting; C' point is similarly high level (+5V) simultaneously, and being coupled to D' point through C6, is that the G-S interpolar of+HV+0.7V, Q2 exists reverse voltage 0.7V after D2 diode clamp, and Q2 ends, and the voltage being compounded in E point is 0V.

So just forming amplitude at E point be+HV, and frequency is the square wave of master oscillator frequenc, after electric capacity C8 coupling, directly serve antenna, antenna just can the electric field of formation and modification generate electromagnetic waves.

Due to Q1, Q2 is operated on off state, output impedance is low, output amplitude is exactly the voltage+HV (namely Rail-to-Rail exports) of high voltage input terminal, can not change because of load, therefore the voltage amplitude exported and antenna length, form etc. have nothing to do, the voltage amplitude serving antenna is exactly+HV.So just avoid debugging antenna, the problems such as the resonance in LC loop, antenna impedance and standing-wave ratio VSWR need not be considered, directly draw and just can effectively generate electromagnetic waves with half-wavelength antenna, install under being convenient to amateurish condition.

Rear class belong to recommend export be well suited for the such capacitor type load of image antenna, because circuit does not exist inductive load, therefore do not produce DC component.When not connecing antenna ,+HV end only has a small amount of electric current, switch current when this is two metal-oxide-semiconductor switch in high-voltage power door, and just have obvious electric current after connecting antenna and produce, electric current changes according to the loading condition of antenna, and long antenna impedance is low, and+HV holds electric current just large; Short antenna impedance is high, and electric current is just little, and suggestion adopts half-wavelength antenna.Can think, the input power of+HV end converts the transmitting power serving antenna substantially to, and pipe consumption is low, and efficiency is high.The input voltage of adjustment+HV end and adjustable transmitting power, this is also make voice modulation voltage input end when amplitude modulation is launched.

Be all form based on gate circuit because circuit is at different levels, be operated on off state, the interference volume that inter-stage is revealed does not affect the low and high level of gate circuit, therefore inter-stage is without the need to shielding, and circuit still can normally work, as usual the stable square wave exporting master oscillator frequenc.

During debugging, only need judge gate oscillator whether starting of oscillation, basic just success, then judge whether E point output amplitude reaches+HV voltage or almost.Concrete grammar is as follows, and audio frequency end ground connection, whether test b point normally exports the square wave of crystal oscillator nominal frequency, and test C point and C' point equally again, whether the frequency of testing E point is afterwards identical, and amplitude should be few with+HV voltage difference.This debugging efforts comparing the radiating circuit that traditional transistor is formed is a lot of less, and much easier, and be well suited for beginner, or install under amateurish condition and make, success rate also can be improved greatly.

Claims

1. the radio transmitter circuit based on door, comprise gate oscillator, shaping buffer, high-voltage power door forms, it is characterized in that: the modulated terminal of audio signal input gate oscillator, become two-way through shaping buffer allocation, drive the high side pipe of high-voltage power door and low side pipe respectively, then be compound to output via antenna transmission electromagnetic wave.