An Automatic Locking Circuit for Static Point Setting of Power Amplifier
A power amplifier, automatic locking technology, applied in the field of radio frequency microwave, can solve the problems of not being static, complex process, not suitable for mass production, etc., to achieve the effect of good practicability and simplified process
Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
The first defect of this technical solution is that the relationship between grid voltage and static operating current is not constant. When in different environments, the relationship curve between grid voltage and static operating current will move up or down. At this time, if you want to make the RF power amplifier To obtain the best performance, it needs to be re-adjusted, making this solution unable to meet the needs of changing experimental environments; second, the relationship curve between the gate voltage and the quiescent operating current of the same RF power amplifier is not necessarily the same, which is not suitable for mass production
However, in this technical solution, the microprocessor needs to write a program control, and the program is downloaded and input, and the process is complicated
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[0034] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0035] image 3 A schematic diagram of an automatic locking circuit for power amplifier static point setting provided by the present invention; including radio frequency power amplifier U1, current sampling resistor R1, amplifier U2, comparator U3, slope voltage generating circuit U4, proportional operation circuit U5 And sample and hold circuit U6. Among them, V O1 is the output voltage of the slope voltage generating circuit U4, V gg is the gate voltage of RF amplifier U1, V ctrl is the output voltage of comparator U3, V ref is the reference voltage of comparator U3, I dd is the quiescent operating current of RF amplifier U1, V rf_in For the RF signal input port, V rf_out It is the output port of the radio frequency signal.
[0036] Figure 4It is a specific implementation circuit diagram of a current sampling resistor and an a...
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The invention discloses an automatic locking circuit for static point setting of a radio frequency power amplifier, which belongs to the field of microwave and radio frequency. The automatic locking circuit includes a radio frequency power amplifier, a current sampling resistor, a comparison circuit module, an amplifier circuit module, a slope generation circuit module, a proportional operation circuit module, and a sample and hold circuit module. Wherein, the static operating current of the RF power amplifier passes through the amplifier module and the comparison circuit module, and the sampling and holding circuit module is controlled to keep the gate voltage of the RF power amplifier at a stable value, thereby maintaining the RF power amplifier at a suitable static operating point. The automatic locking circuit of the present invention is not affected by changes in the relationship between the grid voltage of the radio frequency power amplifier and the static operating current. No matter how the experimental environment changes, the present invention can set a suitable grid voltage of the radio frequency power amplifier to fix the static operating current at one On a specific value, and the whole process does not require human adjustment.
Description
technical field [0001] The invention belongs to the technical field of radio frequency microwaves and is applied to radio frequency power amplifier circuits, in particular to an automatic locking circuit for static point setting of radio frequency power amplifiers. Background technique [0002] The quiescent operating current (drain current) of an RF power amplifier will affect important parameters such as its power compression point, gain, noise figure, intermodulation products, and efficiency. When the quiescent operating current changes, the linearity and efficiency of the RF power amplifier will change accordingly. Usually, when designing a radio frequency power amplifier circuit, it is necessary to fix its quiescent operating current at a specific value so that the radio frequency power amplifier can achieve the best performance index. The quiescent working current is realized by adjusting the grid voltage, so the main function of the RF power amplifier analog bias cir...
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IPC IPC(8): H03G1/00H03G3/30
CPCH03G1/0005H03G3/3042
Inventor 杨青慧何强王明张怀武
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA