Temperature compensation method and system for gain of radio-frequency amplifier
A technology of radio frequency amplifier and temperature compensation, which is applied to high frequency amplifiers and improved amplifiers to reduce temperature/power supply voltage changes. It can solve problems such as unfavorable system integration, low compensation accuracy, and large chip area, and achieve system area reduction. The effect of simple system structure and stable gain
Active Publication Date: 2015-09-23
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. like 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 th...
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The invention discloses a temperature compensation method and a temperature compensation system for gain of a radio-frequency amplifier. The method and the system of the invention are used for solving the problem that the gain of the radio-frequency amplifier is changed because of the change of the environment temperature, and belong to the technical field of an integrated circuit. The method comprises the steps as follows: obtaining a bias current temperature curve enabling the radio-frequency amplifier gain to be constant, dividing the curve as N temperature sections, using a current curve which is linearly changed as the temperature in each temperature section to fit, using a hysteresis comparative method to select the corresponding current curve which is linearly changed as the temperature, and combining to obtain an integrated fitted curve, designing a bias circuit of the radio-frequency amplifier according to the fitted curve. The temperature compensation system designed by the method can be used for automatically compensating the gain of the radio-frequency amplifier according to the change of the environment temperature, thereby maintaining the gain stability 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