A temperature compensation method and system for radio frequency amplifier gain
A technology of radio frequency amplifier and temperature compensation, which is applied to high frequency amplifiers, improved amplifiers to reduce temperature/power supply voltage changes, etc., can solve problems such as unfavorable system integration, low compensation accuracy, large chip area, etc., to reduce system area, The effect of simple system structure and stable gain
Active Publication Date: 2017-11-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
The digital temperature compensation method is characterized by high precision and strong anti-interference, but requires a DAC conversion module and a control unit, resulting in large chip area and high cost, which is not conducive to system integration
The analog temperature compensation method is mainly realized by designing a bias circuit with temperature compensation function, which is characterized by simple principle, easy implementation and low cost, but the compensation accuracy of the existing analog temperature compensation method is not high, that is, when the ambient temperature changes , the gain change of the RF amplifier is still obvious
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[0027] figure 1 It is a flow chart of the temperature compensation method of the radio frequency amplifier gain of the present invention, and taking N=2 as an example according to this flow process, its implementation is as follows:
[0028] Step 1. First, simulate the gain value of the RF amplifier at room temperature.
[0029] Step 2, then, with the gain value obtained in step 1 as the reference gain, determine the bias current value of the radio frequency amplifier under other temperature points, so that the gain value of the radio frequency amplifier under each temperature point is equal to the reference gain, and obtain the radio frequency amplifier gain Constant Bias Current Temperature Profile. Such as figure 2 As shown, the curve IBIAS is the bias current temperature curve for making the gain of the radio frequency amplifier constant in this embodiment.
[0030] Step 3, then, divide the bias current temperature curve in step 2 into N=2 temperature sections, and use...
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The invention discloses a temperature compensation method and system for the gain of a radio frequency amplifier, aiming at solving the problem of the gain change of the radio frequency amplifier caused by the change of the ambient temperature, belonging to the technical field of integrated circuits. This method first obtains the bias current temperature curve that keeps the gain of the RF amplifier constant, divides the curve into N temperature segments, fits the current curve that varies linearly with temperature in each temperature segment, and selects the corresponding bias current curve by hysteresis comparison method. The current curves that vary linearly with temperature are combined to obtain a complete fitting curve, and then the bias circuit of the RF amplifier is designed according to the fitting curve. The temperature compensation system designed according to the method can automatically compensate the gain of the radio frequency amplifier according to the change of the ambient temperature, thereby maintaining the stability of the gain of the radio frequency amplifier.
Description
technical field [0001] The invention relates to the field of integrated circuit design, in particular to a temperature compensation method and system for radio frequency amplifier gain. Background technique [0002] In modern wireless communication systems, the RF amplifier is a key component of RF signal transmission, but changes in the ambient temperature will cause the gain of the RF amplifier to change accordingly. For a typical two-stage power amplifier in a CMOS 90nm process, within the temperature range of -45°C to 125°C, the change in gain is usually 4-5dB. In order to compensate for this performance deviation, temperature compensation techniques are required to compensate for amplifier gain variations. [0003] Traditional temperature compensation methods can be divided into two categories. One is a digital temperature compensation method, and the other is an analog temperature compensation method. The digital temperature compensation method, also known as the ta...
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IPC IPC(8): H03F1/30H03F3/189
Inventor 陈志铭高巍王兴华齐全文
Owner BEIJING INSTITUTE OF TECHNOLOGYGY