KR100594966B1 - Apparatus for Thermal Compensation - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a temperature compensation device.

2. The technical problem to be solved by the invention

An object of the present invention is to provide a temperature compensating device for simplifying the configuration of a circuit for performing temperature compensation, so that it can be employed using a small area for an external RF amplifier or the like, thereby increasing its application range.

3. Summary of Solution to Invention

The present invention provides a temperature compensation device, comprising: first and second branch line coupling means for performing a function of a transmission line of signal power; First and second signal strength adjusting means disposed between the first and second branch line coupling means, for adjusting the strength of the signal input; And control means for applying a current for controlling the first and second signal strength adjusting means.

4. Important uses of the invention

The present invention is used in RF communication components such as RF amplifiers.

Temperature Compensation, RF Amplifiers, Thermistors, OP Amplifiers, Branch Line Couplings, Diodes

Description

Temperature Compensation Device {Apparatus for Thermal Compensation}             

1 is a circuit diagram of an embodiment of a temperature compensation device according to the present invention.

2 is a configuration diagram of an embodiment of a power amplification system for phase control to which a temperature compensation device according to the present invention is applied.

* Explanation of symbols for the main parts of the drawings

101: capacitor 102, 103: diode

110: diode current control unit 120, 130: branch line coupling unit

111: OP amplifier 210, 260: isolator

220: phase shift unit 230: temperature compensation device

240: power amplifier 250: power signal detector

The present invention relates to a temperature compensating device, and more particularly, to a temperature compensating device for minimizing an output change according to a temperature of an RF amplifier or the like used in an RF communication system.

In the following example, a case applied to an RF amplifier will be described as an example.

In general RF amplifiers, gains and losses are generated according to temperature (internal and external temperatures depending on the driving of the device) according to the characteristics of the device constituting the amplifier, which is directly related to the stability of the corresponding amplifier.

In general, the gain change of the amplifier with temperature is inversely related, and various solutions have been proposed to solve this problem.

For example, from a mechanical point of view, a method of maintaining a constant temperature by increasing the surface area of the device or by forcibly blowing air from the surface of the device so that the RF amplifier can perform an appropriate level of operation is presented. In addition, a method of deriving uniform output characteristics by inserting a variable attenuator that can adjust the power of an input signal according to an output between circuits of amplification elements of an RF amplifier is proposed.

However, in the case of the mechanical method as described above, there is a problem in that the application range is limited depending on the structure and size of the communication system in which the RF amplifier is employed, and most of the latter circuit methods are mechanical due to the complexity of the circuit configuration. There is a problem in utilization that the scope of use is limited as in the conventional way.

The present invention has been proposed to solve the above problems, and by simplifying the configuration of the circuit for performing temperature compensation, it can be adopted using a small area, such as an external RF amplifier to increase the range of use The object is to provide a temperature compensation device.

An apparatus of the present invention for achieving the above object, the temperature compensation device comprising: first and second branch line coupling means for performing the function of the transmission line of the signal power; First and second signal strength adjusting means disposed between the first and second branch line coupling means, for adjusting the strength of the signal input; And control means for applying a current for controlling the first and second signal strength adjusting means.

Further, the apparatus of the present invention is arranged at the input end of the first branch line coupling means and the output end of the second branch line coupling means, so that the current which is the output of the control means is transferred to other circuits other than the signal strength adjusting means. And blocking means for preventing the retraction.

In addition, the apparatus of the present invention is arranged between one side of the input terminal of the first branch line coupling means and the ground, the induction means for inducing the signal power reflected by the first and second branch line coupling means to the ground It characterized in that it further comprises.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same number as much as possible even if displayed on different drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of an embodiment of a temperature compensation device according to the present invention.

As shown in the figure, the temperature compensation device according to the present invention includes two branch-line couplers (120, 130) for the function of the transmission line of the RF signal power, the amplifier of In order to maintain a uniform output intensity according to temperature, pin diodes 102 and 103 are arranged in parallel between the two branch line coupling units 120 and 130 to adjust the intensity of the signal input.

Here, R ₁ and R ₃ connected to an input terminal and an output terminal of an op amp (hereinafter, referred to as 'OP') constituting the diode current controller 110 are negative thermistors whose resistance is inversely proportional to temperature. temperature coefficient), and R ₂ connected between the input terminal and the output terminal of the OP amplifier 111 is a general resistor as an element for determining the amplification degree of the OP amplifier 111.

In addition, R ₄ serves to offset the signal power reflected in the branch line coupling parts 120 and 130 to the ground to cancel. For this purpose, the characteristic resistance Z ₀ of the branch line coupling parts 120 and 130 is offset _. The capacitor 101 positioned at the input / output terminals of the branch line coupling units 120 and 130 has a value equal to (R ₄ = Z ₀ ), and the diodes 102 and 103 are controlled by the diode current controller 110. The current I _d applied to is used as a blocking capacitor to prevent the current I _d from being introduced into other circuits other than the temperature compensation device of the present invention.

In the temperature compensation device according to the present invention configured as described above, the output voltage V _out of the OP amplifier 111 constituting the diode current control unit 110 is an input voltage V _in and a resistor R connected to the outside of the OP amplifier 111. ₁ and R ₂ are determined by the following Equation 1.

를 비례상수 K라 하였을 때, 출력전압 V_out은 다음의 [수학식 2]와 같이 정리될 수 있다.here,

When is a proportional constant K, the output voltage V _out can be summarized as Equation 2 below.

Therefore, the output voltage of the OP amplifier 111 is adjusted by the input voltage V _in and the resistors R ₁ , R ₂ and R ₃ of the OP amplifier 111, and the output voltage V _out is the OP amplifier 111. It can be converted into a current I _d applied to the two diodes (102, 103) via R ₃ located at the output terminal of.

Here, when the operating temperature of the RF amplifier with a temperature compensation device according to the present invention is increased, the resistance values (R ₁ and R ₃ ) of the thermistor constituting the diode current control unit 110 is inversely proportional to the increase in temperature. As shown in Equation 2, the variable K is increased, and as a result, the output voltage V _out of the OP amplifier 111 is also increased.

In addition, as described above, the output voltage V _out is a diode (102, 103) located between the two branch line coupling portion (120, 130) by the resistance of the thermistor R ₃ located at the output terminal of the OP amplifier 111. ) may be converted into a current I _d (e) inputted to using these operating characteristics the primary temperature compensating process, the characteristics of the resistance value with respect to increase in temperature, such as thermistors have a resistance R ₃ thermistor resistance R ₁ is inversely proportional By showing, the variable resistance value according to the output voltage V _out of the OP amplifier 111 and the temperature characteristics of the thermistor R ₃ may secondaryly change the diode input current I _d .

The change according to the operating temperature of the current I _d changes the operating resistance of the diodes 102 and 103 located between the two branch line coupling parts 120 and 130, and the operation of the diodes 102 and 103. As the resistance changes, the matching degree between the characteristic resistance Z _o of the branch line coupling part 120 positioned in front of the diodes 102 and 103 and the operating resistance of the diodes 102 and 103 change.

In addition, the degree of matching between the diodes 102 and 103 and the branch line coupling unit 120 at the front end determines the reflectance of the input RF signal power, thereby controlling the amount of signal power finally input.

2 is a configuration diagram of an embodiment of a power amplification system for phase control to which a temperature compensation device according to the present invention is applied.

Considering the arbitrary time t ₁ and t ₂ at which the phase-controlled power amplification system according to the present invention operates (t ₁ <t ₂ ), the internal temperature T ₁ of the system generally changes from time t ₁ to time t ₂ . Therefore, the temperature increases as much as ΔT, and when the internal temperature of the system is T ₂ , it can be summarized as Equation 3 below.

또한, 온도에 따른 증폭기 이득간의 관계는 상술한 바와 같이 온도상승에 따라 일반적으로 이득이 저하되는 현상을 보이며, 시간 t₁, t₂에서의 출력을 P₁, P₂라고 할 때, 온도 상승에 따른 출력강하에 의하여 P₁>P₂의 관계가 형성되므로, 시스템의 안정된 출력을 위하여, 온도 변화에 따른 출력 강하량 ΔP를 최소화하여야 하는 문제가 발생된다.

In addition, the relationship between the gain of the amplifier according to the temperature shows a phenomenon in which the gain generally decreases with the temperature rise as described above, and when the output at the times t ₁ and t ₂ is P ₁ and P ₂ , Since the relationship between P ₁ > P ₂ is formed by the output drop, a problem arises in that the output drop amount ΔP must be minimized due to temperature change in order to stabilize the output of the system.

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The power control system for phase control presented as an embodiment of the present invention, three power amplifier 240, phase shifter 220, the temperature compensation device 230 according to the present invention for high power amplification of the signal power , Including a power signal detector 250 and other components, and the signal power RF _in input to the module may be amplified to the final signal power RF _out through each internal device.

Referring to the temperature compensation process of the power amplification system, the output P _out which varies according to the operating temperature of the power amplification system is connected to the power signal detector 250 located at the ends of the three power amplifiers 240 connected in series. It is output as a DC voltage by the output, the output DC voltage is input to the OP amplifier 111 of the temperature compensation device 230, thereby being used as the input voltage V _in of the OP amplifier 111.

For example, when the operating temperature of the power amplification system rises, like the characteristics of a general amplifier, the output signal power is lowered, and the OP amplifier 111 included in the temperature compensation device 230 according to the present invention. The resistance of the thermistors R ₁ and R ₃ located at the input and output ends of the _circuit will also be lowered.

In this case, the output voltage of the power signal detection unit 250 is also lowered by the output P _out of the lowered power amplification system, and the lowered output voltage of the power signal detection unit 250 corresponds to the OP amplifier of the temperature compensation device 230. The resistance change of the thermistor R ₁ input to the input amplifier 111 of the OP amplifier 111 and R ₂ located at the input / output feedback of the OP amplifier 111 is reflected in Equation 2, and thermistor R _As the resistance value decreases, the proportional constant K increases, so that the output voltage V _out of the OP amplifier 111 also increases.

In addition, the current I _d input to the diodes 102 and 103 is increased by the lowered resistance value of the thermistor R ₃ located at the output terminal of the OP amplifier 111, thereby increasing the operating resistance of the diodes 102 and 103. The degree of matching between the branch line coupling parts 120 positioned in front of the diodes 102 and 103 is improved, and the input passes through the two branch line coupling parts 120 and 130 of the temperature compensation device 230. As the amount of signal power increases, the output P _out of the power amplification system increases.

Description of the circuit operation according to the operating temperature of the power amplifier system can be summarized as shown in Table 1 below.

In this case, at _{t 1 P out (P out @t} 1) denotes the output of the power amplifier system in which the operating temperature higher or lower _{point, P out (P out @t 2} ) at t ₂ the operating temperature The output of the power amplification system at the time point of the compensation process of the temperature compensation device of the present invention according to the rise and fall of.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention includes two thermistor coupling parts connected in series and two diodes positioned between the branch line coupling parts, the thermistor having a characteristic in which the resistance value is inversely proportional to the ambient temperature, and including the thermistor. By adjusting with an OP amplifier, there is an effect of minimizing the output change according to the temperature of the RF amplifier.

In addition, the present invention has an effect that can be employed by using a small area, such as an RF amplifier, by simplifying the configuration of the circuit for performing temperature compensation, there is an effect that can increase the application range.

Claims (5)

In the temperature compensation device, First and second branch line coupling means for performing a function of a transmission line of signal power; First and second signal strength adjusting means disposed between the first and second branch line coupling means, for adjusting the strength of the signal input; And Control means for applying a current for controlling the first and second signal strength adjusting means Temperature compensation device comprising a. The method of claim 1, Blocking means arranged at the input end of the first branch line coupling means and the output end of the second branch line coupling means, respectively, to prevent the current, which is the output of the control means, from entering into other circuits other than the signal strength adjusting means. Temperature compensation device further comprising. The method according to claim 1 or 2, Induction means disposed between one side of the input end of the first branch line coupling means and ground, for inducing signal power reflected by the first and second branch line coupling means to ground. Temperature compensation device further comprising. The method of claim 3, wherein The control means, An operational amplification means for receiving an output signal from an external communication component, which is a temperature compensation object, as an input; First and second thermistors having a resistance value inversely proportional to an operating temperature are connected to an input / output terminal of the operational amplifying means. And an input / output terminal of said operational amplifier means is connected by a resistor for determining an amplification degree. The method of claim 4, wherein The signal strength adjusting means, A temperature compensation device, characterized in that the diode.

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