Electrically-tuned gain equalizer circuit

Abstract

The invention provides an electrically-tuned gain equalizer circuit that can solve the problem that the gain flatness can not be changed by electric tuning during compensating the gain flatness in the prior art, thus resulting in large debugging difficulty and high time cost. The electrically-tuned gain equalizer circuit comprises a 3dB electric bridge, a variable capacitance diode, a capacitor, a resistor and a voltage VCC (volt current condenser), wherein the IN port of the 3dB is connected with a RFin port; the ISO (international standard organization) port is connected with an RFout port; the capacitor is connected in series with the resistor so as to form a first parallel circuit and a second parallel circuit with the variable capacitance diode; the first parallel circuit is connected with the 0-degree output port of the 3dB electric bridge; the second parallel circuit is connected with the minus 90-degree output port of the 3dB electric bridge; the first parallel circuit is also connected with the voltage VCC; the voltage VCC is also connected with the second parallel circuit; and each variable capacitance diode and each resistor are grounded respectively. The equalizer circuit realizes the aim of changing the gain flatness curve by electric tuning, has good consistency, can be debugged flexibly, and saves time cost.

Description

technical field [0001] The invention relates to the field of radio frequency technology design in a mobile communication system, in particular to an electric gain equalizer circuit. Background technique [0002] In some current high-power, high-gain power amplifier links, especially on feed-forward or AAP power amplifiers, due to the long power amplifier links and the large cavity shells used, it is found that the gain fluctuation of the power amplifier is easily affected by the link or AAP during mass production. The influence of the deformation of the cavity shell leads to a large change in the flatness of the gain in the band, which greatly affects the debugging efficiency. If a gain equalizer circuit can be added to the link, the circuit can change the gain curve of the gain equalizer according to the condition of the original in-band gain flatness during debugging, so that it can produce an opposite in a certain frequency band. Gain curve, then the effect of compensati...

AI Technical Summary

Problems solved by technology

However, the above scheme belongs to the circuit of non-electrically adjustable gain equalizer. The disadvantage of this kind of circuit is that every time the compensation curve needs to be changed, the corresponding resistors and capacitors must be updated to re-adjust the equalizer. Very uneconomical in terms of material cost

[0006] Moreover, whether you use the traditional link matching debugging method or use a non-electrically adjustable gain equalizer, if you want to achieve gain equalization, you must use a soldering iron to solder and debug the circuit, which is very troublesome to operate.

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