SU828371A1 - Amplitude modulator - Google Patents

Description

(54) AMPLITUDE MODULATOR

The invention relates to radio technology and can be used to form amlodite-modulated signals, for example, in radio transmitting devices.

Amplitude modulator is known, containing sequentially connected tasks Yupdi and generator and a buffer cascade, successively connected. The first trigger, the first amplifier and the adder, connected in series. The second trigger and the second amplifier, the output of which is connected to another input of the adder, as well as the comparator input (Which is the input of the modulating signal, and the first inverter 1.

However (The known amplitude modulator has a relatively small operating frequency range.

The purpose of the invention is to expand the operating frequency range.

For jToro, in the amplitude modulator containing a series-connected master oscillator and a buffer cascade, successive connections; and, the first trigger, the first amplifier and the adder, the second trigger and the second amplifier in series, the output of which is connected to another input of the sumgmator, as well as A comparator, the input of which is an input of a modulating signal, and the first inverter, between the output of the buffer cascade AND the other input of the comorator, is a Full-wave Recorder, between the output of the comparator and the input: m The first AND was inserted between the comparator output and the second trigger input and the second inverter connected in series, the second inverter IH. The comparator output is also connected to the input of the introduced third trigger, the direct output of which is connected to the other input of the first AND element, and the inverse output - with the other input of the second element I, the direct output and output of the first 1 inverter is connected to the input of the first trigger, the inverse output with the other input of the second trigger, and the direct output of the second inverter is connected to the trigger input but.

On fig. 1 pr.deduced structural electrical circuit of the proposed amplitude modulator; in fig. 2 - time diagrams of his work.

Amplitude modulator contains master oscillator /, buffer cascade 2, full-wave rectifier 3, comparator 4, third trigger 5, first element 6, second element 11, first inverter 8, second inverter 9, first trigger 10, second tr. //, the first amplifier 12, the second amplifier 13, the adder M.

Amplitude modulator works as follows. On the 1KOMparator 4, it submits an "6r-I l / w-sinoo / i" error, which is formed by the IB bilo-rectifier 3, and the modulating signal d / a l / uX Х5 {пЙ (Fig. 2, А). The comparator 4 forms a sequence of imiuls, the sequence of which is two times less than the period of the carrier frequency (Fig. 2, B). The pulse duration is determined by the formula

2E ,.

t: „: arc Sin J7,

,

where ET is a fixed delay that determines the duration of the pulses. on the phone. To €. Trigger 5 divides the following frequency, and Mpulso.v twice (fl-g. 2, C to D). The inputs of the element And 6 receives a sequence of pulses B and C, and the inputs of the terminal And 7 a sequence of pulses In l D. The output pulses of elements And 6 and 7 (Fig. 2, E "/) are fed to the input of inverters 8 9, respectively. The trigger 10 overturns with a differential voltage drop (Fig. 2, f) and returns to its original state with a negative voltage drop (Fig. 2,), and the trigger pattern tl overturns with a negative Differential voltage drop (Fig. 2, I A) returns to the initial state by a negative differential pulse (Fig. 2, C): At the output of the flip-flops 10 and //, the amplifiers of the triggers 10 and 11 are formed on the j / I, C, and 12 and 13 on, PIIK; SHIA is supplied to the adder 14, where the sumM is produced, and the ip and ip. The amplitude of the first harmonic of the resulting voltage (Fig. 2, / C) and 3 | varies with a proprio-modulating signal.

The proposed amplitude modulator is 3 (it is easy to expand the operating frequency and it is also easy to automate the transmitters, since it does not require the transmitter to be tuned when switching from one wave to another. On the final cascades The efficiency of the transmitter Fca. The modulator will allow, while maintaining the quality of the indicators, it will give you the barites and the weight of the transmitter.

 the invention

Amplitude modulator containing sequentially connected master HePeIPoP and buffer cascade, successively connected the first trigger, the first amplifier and the adder, connected in series the second trigger and the second amplifier, the output of which is connected to another input of the adder, as well as the comparator, the input of which is the input of the modulator signal, and the first inverter, characterized in that, with an expansion slot of the operating frequency range, between the output of the buffer stage and the other input of the first comparator, a double-sided The second element is entered between the comparator output and the input of the first iqvirtor, and the second element, and the second input filter, are inserted between the comparator output and the second riger input, and the second I1nverter. The third flip-flop is shown, the direct output of the subsurface is connected to the other input of the nepiBOro element I, and the / inverse output is connected to the other input of the second element And, the direct output of the first inverter is connected to the input of the first trigger, the inverse output is connected to another input of the second trigger, and p my output of the second inverter is connected to the other input of the first flip-flop.

Source of information | Maia taken into account during zylostertiz:

1. USSR author's certificate in accordance with the application i№ 2631475 / 18-09, cl. H 03 C 1/50, 1978 (prototype).

Claims (1)

Claim An amplitude modulator containing a serially connected master oscillator and a buffer stage, a first trigger, a first amplifier and an adder connected in series (a second trigger and a second amplifier, the output of which is connected to another input of the adder, and a comparator, the input of which is the input of the modulating signal, and the first inverter, characterized in that, in order to expand the range of operating frequencies, a half-wave output is introduced between the output of the buffer stage and the other input of the comparator a switch, between the output of the comparator and the input of the first inverter, the first element And is introduced, between the output of the comparator and the input of the second trigger, the second element And and the second inverter are connected in series, while (the output κ the output of which is connected to another input of the first element And, and the inverse output to the Other input of the second element And, the direct output of the first inverter is connected to the input of the first trigger, the inverse output is connected to the other input of the second trigger, and p pit output of the second inverter connected to the other input of the first flip-flop. Source of information taken into account by three examinations: 1. USSR author's certificate on application No. 2631475 / 18-09, cl. H 03 C 1/50, 1978 (prototype). S28371