KR200313402Y1 - Temperature-Compensating Type High Frequency Transmitter - Google Patents

Abstract

The present invention uses a low frequency oscillation circuit that generates a low frequency signal as a temperature compensation circuit so that the temperature compensation range can be widely varied in order to transmit a high quality transmission frequency more stable to changes in ambient temperature in a high frequency transmitter. The present invention relates to a temperature compensated high frequency transmission apparatus configured to obtain a frequency output with low phase noise and a stable frequency level. The temperature compensation type high frequency transmission apparatus according to the present invention for this purpose, the high frequency generator 110 generates a preliminary frequency of the high frequency band lower than the normal output frequency, the low frequency compensation unit 120, the difference between the normal output frequency and the preliminary frequency Phosphorus compensation frequency is generated, and the mixing unit 130 generates the normal output frequency by mixing the preliminary frequency and the compensation frequency. According to the present invention, a higher compensation frequency is used to modulate the data, thereby lowering the phase noise of the high frequency and obtaining a more stable frequency output. In addition, there is an advantage that an integrated circuit or a circuit module constituting the wireless data transmission apparatus by wide compensating the temperature compensation range can be used without being affected by temperature fluctuations.

Description

Temperature-compensated high frequency transmitter {Temperature-Compensating Type High Frequency Transmitter}

The present invention relates to a temperature-compensated high frequency transmission apparatus used in a wireless communication system, and more particularly, by using a low frequency oscillation circuit that outputs a low frequency signal as a temperature compensation circuit so as to vary the temperature compensation range widely. Nevertheless, the present invention relates to a temperature compensated high frequency transmission apparatus configured to obtain a frequency output with low phase noise and stable frequency level.

In general, a wireless communication system uses a carrier signal as a medium for transmitting a signal at a transmitting side. The wireless communication system radiates to the air after a modulation process of putting an amplitude, frequency, or phase of a carrier wave on a signal to be transmitted. On the other hand, the receiving side separates the carrier from the transmitted radio signal and demodulates the original signal to restore the original signal containing the information.

In the case of a transmission device, a frequency signal is generated, amplified, multiplied, modulated, and radiated through a transmission antenna at a high frequency output. At this time, when transmitting data at a high frequency modulation frequency, high transmission power is required.

Such a transmission device compensates for a frequency generator generating a frequency for data modulation, a phase locked loop circuit generating a set oscillation frequency, and an output frequency of a phase locked loop circuit to generate a constant frequency. It has a configuration including a voltage controlled oscillator (Voltage Controlled Oscillator).

The frequency generator, phase locked loop and voltage controlled oscillation module constituting the transmitting device are usually configured as a single circuit module in the form of an integrated circuit according to the development of circuit integration technology.

However, any integrated circuit or circuit module does not generate a signal having a constant frequency under the influence of the temperature change of the surrounding, and has a disadvantage that its frequency characteristic changes.

In general, when the temperature changes from room temperature (+ 25 ° C) to high temperature (+ 50 ° C to + 85 ° C), signals generated from these integrated circuits or circuit modules generally have a characteristic of moving in the low frequency direction. On the contrary, when the temperature is changed from room temperature to low temperature (0 ° C. to −45 ° C.), signals generated in these integrated circuits or circuit modules are moved in the high frequency direction.

Therefore, there is a problem in that the phase noise is high due to the fluctuation of the output frequency signal according to the temperature change, and it is not possible to stably generate a constant regular output frequency required by the transmitter.

Although a temperature compensation circuit is generally employed to stabilize the output frequency that changes according to the temperature change, such a temperature compensation circuit cannot obtain a stable output because its compensation range is small.

In order to solve the above-mentioned problems, the present invention uses a low frequency oscillation circuit that outputs a low frequency signal as a temperature compensation circuit so that the temperature compensation range is widely varied, so that the phase noise is low and the frequency level is stable despite the change in the ambient temperature. It is an object of the present invention to provide a temperature compensated high frequency transmission apparatus configured to obtain a frequency output.

1 is a block diagram schematically showing the configuration of a temperature compensation type high frequency transmission apparatus according to an embodiment of the present invention,

2 exemplarily shows a detailed circuit configuration of a high frequency generator;

3 is a diagram illustrating a detailed circuit configuration of a low frequency compensation unit;

4 is a diagram illustrating a detailed circuit configuration of the mixing unit.

<Description of the symbols for the main parts of the drawings>

100: high frequency generation unit 200: compensation circuit unit

300: mixing unit 110: reference frequency generation module

120: frequency setting module 130: phase locked loop

140: loop filter 150: power rectification module

160: voltage controlled oscillation module 170: frequency feedback module

210: data modulation module 220: resonant module

230: crystal oscillator 240: oscillation module

250: low pass filter 310: mixer

320: amplifier

According to the present invention for achieving the above object, in the temperature compensated high frequency transmission apparatus used in a wireless communication system, in order to obtain a normal output frequency of the temperature compensated high frequency transmission apparatus, a high frequency band lower than the normal output frequency High frequency generating unit for generating a; A low frequency compensator for generating a compensation frequency that is a difference between the normal output frequency and the preliminary frequency and performing modulation of digital data to be transmitted to the compensation frequency; And a mixing unit generating the normal output frequency by mixing the preliminary frequency and the data modulated compensation frequency.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The temperature compensation type high frequency transmission device according to the present invention uses a low frequency oscillation circuit that generates a low frequency signal as a temperature compensation circuit in a high frequency transmission device that generates a high frequency signal, thereby causing the low frequency temperature compensation circuit By increasing the compensation range, the phase noise is lowered and a more stable output frequency is generated.

In particular, the temperature-compensated high frequency transmission apparatus of the present invention is applied to a wireless data transmission apparatus for processing S band RF signals. However, the same technical idea is not excluded from application to other types of transmission apparatus. The frequency of the S band is a conventional abbreviation for a part of the frequency band of a satellite communication service, for example, the frequency band of 2.0 to 4.0 GHz, and the S band is also used in a wireless communication field such as a military air traffic control system. .

In addition to the S band, the frequency band of the communication service using a satellite is divided into, for example, a C band, a Ka band, a Kj band, a Ku band, a K band, an L band, an O band, a P band, and a Q band. The C band is 3.90 to 6.20 GHz or 4.0 to 8.0 GHz, the Ka band is 26.5 to 40.0 GHz, the Kj band is 10.90 to 17.25 GHz, the Ku band is 12.5 to 18.0 GHz, and the K band is The band is 10.9-36.0 GHz, the L band is 390-1550 MHz or 1,000-2,000 MHz, the O band is 36.0-46.0 GHz, the P band is 225-390 MHz, the Q band Is a customary abbreviation for 33.0 to 46.6 GHz or 36.0 to 46.0 GHz, V band for 46.0 to 56.0 GHz, X band for 5.2 to 13.09 GHz or 6.20 to 10.90 GHz or 8.0 to 12.5 GHz to be.

1 is a block diagram schematically showing the configuration of a temperature-compensated high frequency transmission apparatus according to a preferred embodiment of the present invention.

The high frequency transmission apparatus 001 according to the present invention largely includes a high frequency generator 100, a low frequency compensator 200, and a mixing unit 300.

The high frequency generator 100 generates a signal having a preliminary frequency lower than the normal output frequency, for example, 2950 MHz, to generate a normal output frequency, for example, 3000 MHz, of the transmitter.

The low frequency compensator 200 generates a compensation frequency, that is, a signal of 50 MHz, which is a difference between a normal output frequency and a preliminary frequency of the transmitter, and performs a modulation function for loading data on the compensation frequency.

The mixing unit 300 generates a regular output frequency of 3000 MHz by mixing a preliminary frequency of 2950 MHz generated by the high frequency generator 110 and a compensation frequency of 50 MHz generated by the low frequency compensator 200. Perform.

According to the above-described configuration, the temperature compensation frequency is significantly compensated to 50 MHz to obtain a steady output frequency of 3000 MHz, and this compensation frequency is used to modulate the data, thereby making the transmission power of the transmitting device stable. Can contribute.

In addition, the values of the normal output frequency, the reserve frequency, the compensation frequency, the reference frequency, and the resonant frequency of the transmission apparatus presented in the above description of the present invention are used as examples for the description of the present invention, and are set to other frequency values. You will need to know that.

2 is a diagram illustrating a detailed circuit configuration of the high frequency generation unit 100 by way of example.

The high frequency generator 100 includes a reference frequency generating module 110, a frequency setting module 120, a phase locked loop 130, a loop filter 140, a power rectifying module 150, a voltage controlled oscillation module 160, and And a frequency feedback module 170.

The reference frequency generating module 110 is composed of capacitors 111 and 114, a crystal oscillator 112, and a resistor 113, and a reference frequency for comparing with the output frequency of the voltage controlled oscillation module 160, for example, 8.62305 MHz. Generates a signal of.

The frequency setting module 120 is configured by a data processing method and sets an oscillation frequency value so that the oscillation frequency set in the phase locked loop 230 is output.

The phase locked loop 130 includes an input (in) and an output (out) terminal to which the crystal oscillator 112 of the reference frequency generating module 110 is connected, and a data input terminal to which a frequency setting signal of the frequency setting module 120 is applied. In order to apply power, the power input terminal Vcc to which the power supply Vcc is applied through the rectifying circuit of the power supply rectifying module 150 and the input terminal Fin to which the frequency provided from the frequency feedback module 170 is applied are applied. Having an integrated circuit. The phase locked loop 130 fixes the oscillation frequency generated inside the voltage controlled oscillation module 160 to the frequency value set by the frequency setting module 120 so that a constant frequency is always generated from the voltage controlled oscillation module 160. .

The loop filter 140 has a phase locked loop 130 connected to one side thereof, and a voltage controlled oscillation module 160 connected to the other side thereof, and has a resistance on a connection line between the phase locked loop 130 and the voltage controlled oscillation module 160. 145 and 147 are connected in series, a resistor 142 and a capacitor 143 and 144 in parallel connection are connected in series between the connection line and the ground, and the resistor 145 and the resistor ( The capacitor 146 is connected between the connection point of the 147 and the ground, and the capacitor 141 is connected between the ground and the connection line of the phase locked loop 130 side. The phase locked loop 230 removes noise from the output and compensates the frequency characteristic of the next voltage controlled oscillation module 160 to be improved.

The voltage controlled oscillation module 160 generates a frequency having a fixed frequency value by the phase locked loop 130. The frequency generated by the voltage controlled oscillation module 160 is a preliminary frequency of the 2950 MHz signal and is output to the mixing unit 300 through the resistor 161 and the capacitor 162, while the frequency feedback module through the resistor 172. Provided at 170. The voltage controlled oscillation module 160 is affected by the ambient temperature so that its output frequency is not stable. Therefore, the output frequency transmitted from the voltage controlled oscillation module 160 to the mixing unit 300 is also not stable. However, the output frequency may be a stable frequency signal by being compensated by the compensation frequency applied from the low frequency compensator 200 in the mixer 300.

The frequency feedback module 170 includes resistors 172 and 173 and a capacitor 171, and feeds back a preliminary frequency generated by the voltage controlled oscillation module 160 to the phase locked loop 130. Therefore, the phase locked loop 130 compares the feedback frequency fed back through the frequency feedback module 170 with the reference frequency, and compensates for the amount of change in the oscillation frequency of the voltage controlled oscillation module 160 changed according to the change of the ambient temperature. The output frequency of the constant 2950 MHz signal is always generated from the voltage controlled oscillation module 160.

3 is a diagram illustrating a detailed circuit configuration of the low frequency compensation unit 200.

The low frequency compensator 200 illustrated in FIG. 3 includes a data modulation module 210, a resonance module 220, a crystal oscillator 230, an oscillation module 240, and a low pass filter 250.

The data modulation module 210 includes a plurality of resistor circuits 211, 212, 213, 214, 215, and 216 and a character diode 217 to modulate digital data input through the data input terminal (data). It consists of. The varactor diode 217 is turned on and off according to a high or low level of input digital data to output a data modulated signal.

The resonant module 220 includes a temperature compensating circuit and a crystal oscillator 230 composed of a parallel circuit of an inductor 221 and a temperature compensating capacitor 222, 223 connected in series with the output of the data modulation module 210. . The crystal oscillator 230 generates a resonant frequency, for example, a 51 MHz signal, in accordance with the data modulated output of the data modulation module 210, and the temperature compensation circuit outputs the resonance frequency of the crystal oscillator 230 that varies with temperature change. Perform a function to compensate.

The oscillation module 240 includes an oscillation circuit composed of capacitors 244 and 245 and a transistor 247, and generates a compensation frequency of a 50 MHz signal by oscillating according to the resonance frequency generated by the crystal oscillator 230.

The low pass filter 250 is composed of capacitors 251, 253, and 255 and inductors 252 and 254, and mixes harmonics by removing harmonics from the compensation frequency of the 50 MHz signal generated by the oscillation module 240. Output to the unit 300.

4 is a diagram illustrating a detailed circuit configuration of the mixing unit 300 by way of example.

The mixing unit 300 shown in FIG. 4 includes a mixer 310 and an amplifier 320 as main components.

The mixer 310 has an input terminal Lo to which a signal having a preliminary frequency of 2950 MHz generated by the high frequency generator 100 is applied, and an input terminal to which a signal having a compensation frequency of 50 MHz generated from the low frequency compensator 200 is applied ( IF), ground terminal (GND) and output terminal (RF) in the form of an integrated circuit. The mixer 310 mixes a signal having a preliminary frequency of 2950 MHz applied through an input terminal Lo and a signal having a compensation frequency of 50 MHz applied through an input terminal IF to output a frequency of a 3000 MHz signal to an output terminal RF. Output through).

The amplifier 320 amplifies the output frequency of the mixer 310.

That is, the temperature compensation type high frequency transmission device 001 configured as described above in the high frequency generator 100, the reference frequency generating module 110 generates a reference frequency, the frequency setting module 120 sets the oscillation frequency value do.

The phase locked loop 330 fixes the oscillation frequency generated by the voltage controlled oscillation module 160 with the frequency value set by the frequency setting module 120, removes noise from the output, and then performs the voltage controlled oscillation module of the next stage ( The frequency characteristic of the 160 is improved.

The voltage controlled oscillation module 160 generates a frequency having a fixed frequency value by the phase locked loop 130. The frequency generated by the voltage controlled oscillation module 160 is output to the mixing unit 300 as a preliminary frequency of the 2950 MHz signal and provided to the frequency feedback module 170.

The frequency feedback module 170 feeds back the preliminary frequency generated by the voltage controlled oscillation module 160 to the phase locked loop 130. Therefore, the phase locked loop 130 compares the feedback frequency fed back through the frequency feedback module 170 with the reference frequency, compensates for the variation of the oscillation frequency changed according to the change of the ambient temperature, and then, from the voltage controlled oscillation module 160, Ensure that the output frequency of a constant 2950 MHz signal is always generated.

Meanwhile, in the low frequency compensator 200, the data modulation module 210 modulates digital data input through the data input terminal (data), and the varactor diode 217 has a high or low level of the input digital data. By on and off according to the data modulated signal outputs to the resonance module (220).

The resonance module 220 generates a 51 MHz resonant frequency signal according to the data modulated output of the modulation module 210 by the crystal oscillator 230, and the oscillation module 240 generates the resonance generated by the crystal oscillator 230. Oscillating with frequency produces a compensating frequency of a 50 MHz signal.

The compensation frequency of the 50 MHz signal output from the resonance module 230 passes through the low pass filter 250 to remove harmonics and outputs the harmonics to the mixing unit 300.

The mixing unit 300, which receives a preliminary frequency signal of 2950 MHz from the high frequency generator 100 and a 50 MHz compensation frequency signal from the low frequency compensator 200, mixes the two frequency signals by the mixer 310. Then, the amplifier 320 amplifies and outputs a 3000 MHz normal frequency signal to its output stage.

Therefore, a constant and stable normal frequency signal can be always obtained to the output terminal of the mixing unit 300 by the signal compensated by the low frequency compensator 200.

According to an embodiment of the present invention, a low frequency transmission circuit that outputs a low frequency signal is used as a temperature compensation circuit of a high frequency transmission device so that its temperature compensation range is widely varied, so that the phase noise is low even when the ambient temperature changes and the frequency level is stable. You can get the output.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas falling within the scope of the present invention should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, by using a higher compensation frequency than the conventional one in modulating data, phase noise of a high frequency can be lowered, and a more stable frequency output can be obtained.

In addition, by using a higher frequency than the conventional temperature compensation, there is an advantage that an integrated circuit or a circuit module constituting the wireless data transmission apparatus can be used without being affected by temperature fluctuation by broadly compensating the temperature compensation range.

Claims (5)

In the temperature compensated high frequency transmission apparatus used in a wireless communication system, A high frequency generator configured to generate a preliminary frequency of a high frequency band lower than the normal output frequency to obtain a normal output frequency of the temperature compensated high frequency transmitter; A low frequency compensator for generating a compensation frequency that is a difference between the normal output frequency and the preliminary frequency and performing modulation of digital data to be transmitted to the compensation frequency; And Mixing unit for generating the normal output frequency by mixing the preliminary frequency and the data-modulated compensation frequency Temperature compensation type high frequency transmission device comprising a. The method of claim 1, wherein the high frequency generation unit, A reference frequency generation module for generating a reference frequency; A frequency setting module for setting a fixed frequency value; A phase locked loop for generating a fixed signal at a fixed frequency value set by the frequency setting module; A voltage controlled oscillation module generating the preliminary frequency having a fixed frequency value by the phase locked loop and outputting the preliminary frequency to the mixing unit; A loop filter to remove noise from an output of the phase locked loop to improve frequency characteristics of the voltage controlled oscillation module; And By feeding back the preliminary frequency to the phase locked loop, a compensation amount of the oscillation frequency of the voltage controlled oscillation module that is changed according to the temperature change in the phase locked loop is compensated to generate a constant compensation frequency from the voltage controlled oscillation module. Frequency feedback module Temperature compensation type high frequency transmission device comprising a. The method of claim 1, wherein the low frequency compensation unit, A data modulation module for modulating the data to be transmitted; A resonance module comprising a crystal oscillator for generating a predetermined resonance frequency and a temperature compensating unit for compensating the resonance frequency which is varied according to temperature change; An oscillation module which oscillates according to the resonance frequency generated by the crystal oscillator to generate the compensation frequency; And Low pass filter which removes harmonic components from the compensation frequency and outputs them to the mixer Temperature compensation type high frequency transmission device comprising a. The method of claim 1, wherein the mixing unit, A mixer for mixing the preliminary frequency output from the high frequency generator and the compensation frequency output from the low frequency compensator; And Amplifier for amplifying the frequency output from the mixer Temperature compensation type high frequency transmission device comprising a. The method of claim 1, The temperature compensation high frequency transmission device is a temperature compensation high frequency transmission device, characterized in that applied to a wireless data transmission device for processing S-band Radio Frequency (Radio Frequency) signal.