RU2616472C2 - Radio-frequency signals generating and transmitting device using pulse-width modulation - Google Patents

Abstract

FIELD: radio electronics.

SUBSTANCE: invention relates to radio-electronic equipment. Device comprises source of input complex signal (IS) with two outputs, unit of reference linearly varying signals (RLVSU) sources, having at least two sources, pulse-width modulation conversion unit (PWM CU), having at least two converters, quadrature harmonic signal high-frequency generator (QHSHFG) with in-phase and quadrature outputs, which are connected to first and second signals multipliers (SM) reference inputs, respectively, high-frequency power amplifier, radio-frequency band-pass filter, which output is connected to antenna.

EFFECT: technical result of invention consists in improvement of efficiency and its stability, reduced weight and dimensions.

1 cl, 1 dwg

Description

The present invention relates to electronic equipment and can be used to generate, amplify and transmit signals over radio channels, in particular in television broadcasting and telecommunication systems.

A device is known [Patent US 2009/02270056 A1, Pub. Date: Oct. 29, 2009. Inventors: Peter Singerl, Andreas Wiesbauer. Modulation system and method for switched amplifiers. Int. Cl: H04B 1/04; H01Q 11/12] generating and transmitting radio frequency signals using pulse-width modulation, containing a source of complex input signal with two outputs, the first output of which is connected to the input of the pulse-width modulator, and the second output to the input of a high-frequency generator having in-phase and quadrature exits. The output of the pulse-width modulator is connected to the signal inputs of the first and second signal multipliers, the reference inputs of which are connected respectively to the in-phase and quadrature outputs of the high-frequency quadrature harmonic signal generator. The output of each of the multipliers separately through a series-connected high-frequency power amplifier and matching complex phase-shift filter is connected to one of the inputs of the complex power adder, the output of which is connected to the antenna through a band-pass filter.

The device operates as follows. In a pulse-width modulator, the signal corresponding to the current value of the complex input signal module is converted into a pulse width and fed to the signal inputs of two multipliers. The reference inputs of the first and second multipliers receive, respectively, in-phase and quadrature harmonic signals from the outputs of the high-frequency quadrature harmonic signal generator, 90 ° phase-shifted and having an initial phase equal to the phase of the complex input signal source. The output signal of each of the multipliers is amplified by power, passed through a matching complex phase-shifting filter and fed to the complex power adder, where a high-frequency signal with a complex envelope containing information about the module and phase of the complex input signal is obtained. The output signal of the complex power adder is passed through a band-pass radio-frequency filter, which forms the spectrum of the output RF signal. The signal from the output of the band-pass filter passes to the antenna of the transmitter.

However, this device has a large redundancy of its constituent nodes, which include a second high-frequency power amplifier, two matching complex phase-shifting filters and an integrated power adder. In addition, to ensure accurate summation of the output powers of high-frequency amplifiers in the complex power adder, fine tuning of complex phase-shift filters is required. Due to the instability of the parameters of the elements of the device, due to aging and temperature instability of the environment, the delay time of the signals in the complex phase-shifting filters included in the parallel channels is different. This leads to a violation of the temporal coordination at the inputs of a complex power adder and, therefore, to a violation of the accuracy of summing the powers in a complex power adder. The presence of the above disadvantages reduces the coefficient of performance (COP) and its stability during operation, and the presence of excess nodes leads to an increase in the mass and dimensions of this device.

A device for generating and transmitting radio frequency signals using pulse width modulation is also known [Patent EP 2582039 A2, Pub. Date: 04/17/2013, Bulletin 2013/16. Inventors: Franz Die-lacher, Martin Matain, Christian Schuberth, Peter Singerl. System and method for generating a radio frequency pulse-width modulated signal. Int. Cl: H03F 1/02; H03F 3/60; H03F 7/217], the closest in technical solution to the proposed invention (prototype). This device comprises a complex input signal source with two outputs, a linearly varying reference signal source block having at least two sources, a pulse-width modulation converter block having at least two converters, the signal inputs of which are combined, and the reference inputs are connected to the outputs of the source block reference linearly varying signals, a high-frequency quadrature generator of harmonic signals with in-phase and quadrature outputs, which are connected respectively to the reference m inputs of the first and second multipliers signals, the high frequency power amplifier, an RF bandpass filter, whose output is connected to the antenna.

The device has redundant nodes, which include at least a second high-frequency power amplifier, two matching complex phase-shifting filters and an integrated power adder. Along with this, to achieve an accurate summation of the output signals of high-frequency power amplifiers, it is necessary to fine-tune matching complex phase-shift filters with an adder of complex powers. However, due to the instability of the parameters of the elements of the device, due to aging and temperature instability of the environment, the synchronous operation of the device due to the difference in the delay time in the parallel channels is violated and the power of the signal supplied to the antenna is reduced. The combination of the above disadvantages leads to the fact that the efficiency (efficiency) of the device is reduced and is not stable during operation. Along with a decrease and insufficient stability of efficiency, excessive nodes increase the mass and dimensions of the device.

The objective of the invention is to provide a device with a large and stable efficiency and having lower mass and dimensions.

The solution to this problem is achieved by the fact that in a known device for generating and transmitting radio frequency signals, containing a source of an input complex signal with two outputs, a block of sources of reference linearly varying signals having at least two sources, a block of pulse-width modulation converters having at least two converters whose signal inputs are combined, and the reference inputs are connected to the outputs of the block of sources of reference linearly varying signals, a high-frequency quadrature generator monic signals with in-phase and quadrature outputs, which are respectively connected to the reference inputs of the first and second multipliers signals, the high frequency power amplifier, an RF bandpass filter, whose output is connected to an antenna, two adders introduced additionally, two arithmetic calculator and a digital to analog converter. In this case, the source of the input complex signal with its first and second outputs is connected respectively to the first and second inputs of the first arithmetic calculator, the first output of which is connected to the combined signal inputs of the pulse-width modulation transducer block, and the second output is connected to the second input of the second arithmetic calculator. Each of the outputs of the block of pulse-width modulation converters is connected respectively to one of the inputs of the first adder having at least two inputs. The output of the first adder is connected to the first input of the second arithmetic calculator, the first and second outputs of which are connected respectively to the signal inputs of the first and second signal multipliers. The outputs of the first and second signal multipliers are respectively connected to the first and second inputs of the second adder, the output of which is connected to the input of a digital-to-analog converter connected by its output through a high-frequency power amplifier to the input of a band-pass filter.

Also, a high-frequency power amplifier may comprise a Doherty amplifier having at least two active and at least one closed states.

The drawing shows a functional diagram of a device for generating and transmitting radio frequency signals.

A device for generating and transmitting radio frequency signals using pulse width modulation contains an input source signal complex with two outputs that are connected respectively to the first and second inputs of the first arithmetic calculator (AB1) 2, a block of sources of reference linearly varying signals (BI Eop) 3, having at least two sources, a block of pulse-width modulation converters (PWM1 ... PWMN) 4, having at least two converters, the signal inputs of which are combined and connected to the first exit AB1. The reference inputs of the block of PWM converters are connected to the outputs of the block of sources of reference ramp signals BI Eop 3. The outputs of the block of PWM converters 4 are connected to the inputs of the first adder 5 having at least two inputs. The output of the first adder 5 is connected to the first input of the second arithmetic calculator (AB2) 6, the second input of which is connected to the second output of the first arithmetic calculator (AB1). The first and second outputs of the second arithmetic calculator AB2 are connected respectively to the first 7 and second 8 signal inputs of the multipliers 9 and 10, respectively. The common-mode and quadrature outputs of the high-frequency quadrature harmonic signal generator (VCHKGS) 13 are connected respectively to the reference inputs 11 and 12 of the multipliers 9. The outputs of the first 9 and second 10 signal multipliers are connected respectively to the first and second inputs of the second adder 14, the output of which is connected to the input of the digital-to-analog converter 15, soy dyed by its output through a high-frequency power amplifier 16 with the input of a band-pass filter 17, the output of which is connected to the antenna 18.

In the proposed device, all well-known blocks are used:

- a block of sources of reference linearly varying signals 3 - this is a block of generators of linearly varying triangular voltages (see, for example, Alekseenko A.G., Colombet Ε.Α., Starodub G.I. Application of precision analog ICs. - M .: Radio and communication, 1981. - 224 p., p. 141-143);

- a block of pulse-width modulation converters 4 is considered in the patent: Yamaha Corporation, Noro Masao; Tsuji Nobuaki 7 H03F 3/38, US 6778011 BB, issued August 17, 2004 Priority July 29, 2002;

- high-frequency power amplifier 16 can be performed according to the scheme of the Doherty amplifier (see Patent US 2009/0179702 A1, Pub. Date: Jul. 16. 2009. Inventor - Igor Blednov. Doherty amplifier. Int. Cl: H03F 1/07);

- arithmetic adders 5 and 14 and arithmetic calculators AB1 2 and AB2 6, digital multipliers 9 and 10, built on the basis of matrix multipliers (see Ugryumov E.P. Design of computer elements and nodes. - M.: Vyssh. shk., 1987 p. 181-206;

- band-pass radio-frequency filters (see Gutnikov B.C. Filtering of measuring signals. - L.: Energoatomizdat, 1990. - 192 p.);

- high-frequency quadrature harmonic signal generator (VCHKGS) 13 (see Lenk J. Electronic circuits: a Practical Guide. Translated from English. - M .: Mir, 1985, - 343 p., Fig. 9.21, pp. 291-293) .

1, где n - текущий индекс вектора комплексных сигналов

, на первом и втором выходах формирует сигналы, содержащие информацию соответственно о действительном Re

и мнимом Im

компонентах комплексного сигнала

. Эти сигналы поступают соответственно на первый и второй входы первого арифметического вычислителя (AB1) 2. Первый арифметический вычислитель 2 формирует отсчеты текущих значений модуля

и фазы ϕ_c источника комплексного сигнала

, которые поступают соответственно на его первый и второй выходы. Блок источников опорных линейно изменяющихся сигналов (БИ Eоп) 3 содержит не менее двух источников. Он формирует дискретные линейно изменяющиеся напряжения Eоп с различными начальным и конечным уровнями. Каждое из напряжений Eопi поступает на соответствующий опорный вход блока преобразователей широтно-импульсной модуляции (БП ШИМ) 4. Здесь Eоп_i сравнивается с напряжением арифметического вычислителя AB1 на его первом выходе. Следовательно, на каждом из выходов БП ШИМ содержится определенный широтно-импульсный (ШИМ) сигнал Ew_i, где подиндекс i соответствует номеру преобразователя в БП ШИМ. Сигналы Ew_i поступают в первый сумматор 5, где производится их суммирование. В результате суммирования на выходе первого сумматора 5 имеется сигнал

, содержащий информацию о

сигнала

. Сигнал Ew с выхода первого сумматора поступает на первый вход второго арифметического вычислителя AB2 6, на второй вход которого поступает сигнал со второго выхода AB1, содержащий информацию о текущем значении фазы ϕc источника комплексного сигнала

. На первом 7 и втором 8 выходах второго арифметического вычислителя 6 и, следовательно, на сигнальных входах перемножителей 9 и 10, имеются сигналы, содержащие соответственно информацию о текущих значениях действительного Ew⋅cosϕ_c и мнимого Ew⋅sinϕ_c компонентах, в которых сигнал Ew, содержит информацию о

, а фаза ϕ_c - это фаза источника комплексного сигнала

. На опорные входы 11 и 12 перемножителей 9 и 10 поступают соответственно синфазный и квадратурный сигналы с выходов высокочастотного квадратурного генератора гармонических сигналов (ВЧКГС) 13. Выходные высокочастотные сигналы перемножителей 9 и 10 содержат высокочастотные гармонические несущие, сдвинутые по фазе на 90°, соответственно с огибающими Ew⋅cosϕ_c и Ew⋅sinϕc. Выходные сигналы перемножителей 9 и 10 суммируются во втором сумматоре 14. В результате сложения на выходе второго сумматора 14 формируется высокочастотный сигнал с комплексной огибающей

и частотой, равной частоте высокочастотного генератора квадратурных гармонических сигналов 13. Сигнал с выхода второго сумматора 14 поступает в цифроаналоговый преобразователь 15, где он преобразуется в аналоговый сигнал, который усиливается в высокочастотном усилителе мощности 16. Усиленный по мощности высокочастотный сигнал с комплексной огибающей

проходит через полосовой радиочастотный фильтр 17, который формирует радиочастотный спектр сигнала. Вследствие этого на выходе полосового радиочастотного фильтра 17 имеется высокочастотный сигнал с комплексной огибающей

. Сигнал с выхода полосового радиочастотного фильтра 17 подается в антенну 18 передающего устройства.The proposed device operates as follows. Complex signal source

1, where n is the current index of the complex signal vector

, at the first and second outputs generates signals containing information, respectively, about the actual Re

and imaginary Im

complex signal components

. These signals are supplied respectively to the first and second inputs of the first arithmetic calculator (AB1) 2. The first arithmetic calculator 2 generates samples of the current values of the module

and phase ϕ _{c of the} complex signal source

which arrive respectively at its first and second outputs. The block of sources of reference linearly varying signals (BI Eop) 3 contains at least two sources. It forms discrete linearly varying voltages Eop with various initial and final levels. Each of the voltages Eopi goes to the corresponding reference input of the block of pulse-width modulation converters (PSU PWM) 4. Here, Eop _{i is} compared with the voltage of the arithmetic calculator AB1 at its first output. Therefore, at each of the outputs of the PWM PSU there is a specific pulse-width (PWM) signal Ew _i , where the sub-index i corresponds to the number of the converter in the PWM PSU. The signals Ew _i enter the first adder 5, where they are summed. As a result of the summation at the output of the first adder 5 there is a signal

containing information about

signal

. The signal Ew from the output of the first adder is fed to the first input of the second arithmetic calculator AB2 6, the second input of which receives a signal from the second output AB1 containing information about the current value of the phase ϕc of the complex signal source

. At the first 7 and second 8 outputs of the second arithmetic calculator 6 and, therefore, at the signal inputs of the multipliers 9 and 10, there are signals containing respectively information on the current values of the real Ew⋅cosϕ _c and imaginary Ew⋅sinϕ _c components in which the signal Ew, contains information about

and the phase ϕ _c is the phase of the complex signal source

. The reference inputs 11 and 12 of the multipliers 9 and 10 respectively receive in-phase and quadrature signals from the outputs of the high-frequency quadrature harmonic signal generator (VCHKGS) 13. The output high-frequency signals of the multipliers 9 and 10 contain high-frequency harmonic carriers phase-shifted 90 °, respectively, with envelopes Ew⋅cosϕ _c and Ew⋅sinϕc. The output signals of the multipliers 9 and 10 are summed in the second adder 14. As a result of addition at the output of the second adder 14, a high-frequency signal with a complex envelope is formed

and a frequency equal to the frequency of the high-frequency generator of quadrature harmonic signals 13. The signal from the output of the second adder 14 is fed to a digital-to-analog converter 15, where it is converted into an analog signal, which is amplified in a high-frequency power amplifier 16. A high-power signal with a complex envelope amplified by power

passes through a band pass filter 17, which forms the radio frequency spectrum of the signal. As a result, at the output of the band-pass filter 17 there is a high-frequency signal with a complex envelope

. The signal from the output of the bandpass filter 17 is supplied to the antenna 18 of the transmitting device.

The exclusion of redundant nodes and parallel branches containing high-frequency power amplifiers, complex phase-shifting filters and an adder of complex powers, as well as the use of known additional elements and new connections between nodes, provide an increase in the overall device efficiency and greater stability over a long time of operation, and also a decrease in its mass and dimensions.

To further increase the efficiency of the device, the high-frequency power amplifier may include a Doherty amplifier [Patent US 2009/0179702 A1, Pub. Date: Jul. 16. 2009. Inventor - Igor Blednov. Doherty amplifier. Int. Cl .: H03F 1/07] having at least two active and at least one closed state.

In addition, the exclusion of expensive nodes, at least one high-frequency power amplifier, two complex phase-shifting filters and an adder of complex powers, significantly reduces the cost of the device.

Claims (2)

1. A device for generating and transmitting radio frequency signals using pulse-width modulation, containing a source of an input complex signal with two outputs, a block of sources of reference linearly varying signals having at least two sources, a block of pulse-width modulation converters having at least two converters, whose signal inputs are combined, and the reference inputs are connected to the outputs of the block of sources of reference linearly varying signals, a high-frequency quadrature harmonic generator signals with common-mode and quadrature outputs, which are connected respectively to the reference inputs of the first and second signal multipliers, a high-frequency power amplifier, a radio-frequency bandpass filter, the output of which is connected to the antenna, characterized in that two adders, two arithmetic calculators and a digital-analogue are additionally introduced into it a converter, wherein the source of the input complex signal is connected with its first and second outputs, respectively, to the first and second inputs of the first arithmetic of the first calculator, the first output of which is connected to the combined signal inputs of the pulse-width modulation converters block, and the second output is connected to the second input of the second arithmetic calculator, each of the outputs of the pulse-width modulation converters block is connected respectively to one of the inputs of the first adder having at least two inputs, the output of which is connected to the first input of the second arithmetic calculator, the first and second outputs of which are connected respectively to the signal inputs of of the first and second signal multipliers, the outputs of the first and second signal multipliers are connected respectively to the first and second inputs of the second adder, the output of which is connected to the input of a digital-to-analog converter connected by its output through a high-frequency power amplifier to the input of a band-pass filter. 2. The device according to claim 1, characterized in that the high-frequency power amplifier contains a Doherty amplifier having at least two active and at least one closed state.

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