Temperature compensation power amplifier circuit
A power amplifier and circuit technology, applied in power amplifiers, improving amplifiers to reduce temperature/power supply voltage changes, etc., can solve the problems of inability to compensate for power triodes, limited temperature compensation, and changes in power amplifier output characteristics, and achieve enhanced temperature compensation. effect, improve stability, reduce the amount of change
Inactive Publication Date: 2011-03-30
RDA TECH
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Problems solved by technology
[0004] However, this structure has a limited effect on temperature compensation and cannot fully compensate the variation of the power transistor with temperature, so when the temperature changes, the output characteristics of the power amplifier will still change.
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[0011] The temperature compensation power amplifier circuit of the present invention is as follows figure 2 As shown, it includes a power amplifier circuit and a bias circuit, the power amplifier circuit includes a signal input terminal RFIN, and the signal input terminal RFIN passes through a capacitor C IN Connected to the base of the power triode Q4 for signal power amplification, the emitter of the power triode Q4 is grounded, the collector is connected to the first power supply terminal VCC through the inductor L1, and the collector of the power triode Q4 also passes through the capacitor C OUT Connected to the signal output terminal RFOUT, in the bias circuit, the bias voltage input terminal V BIAS The resistor R2 is connected to the collector of a transistor Q5, the emitter of the transistor Q5 is grounded, the collector of the transistor Q5 is also connected to the base of the transistor Q6, and the collector of the transistor Q6 is connected to the second power suppl...
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The invention discloses a temperature compensation power amplifier circuit, wherein, a biasing circuit adopts an operational amplifier type circuit organization playing the role of enhancing the temperature compensation function of the biasing circuit; and transistor current I1 changes along with the change in the temperature, VBE variable quantity caused by the change in the transistor current I1 is compensated for by a difference transistor in an operational amplifier circuit effectively, so that the circuit is insensitive to temperature variation. The temperature compensation power amplifier circuit designs the biasing circuit by adopting the operational amplifier type circuit, enhances the temperature compensation function of the biasing circuit, obviously reduces the variable quantity of the power amplifier output characteristic caused by the temperature variation, and markedly increases the stability of the power amplifier.
Description
technical field [0001] The invention relates to a power amplifier circuit, in particular to a power amplifier circuit with a temperature compensation function. Background technique [0002] In modern wireless communication systems, RF power amplifiers are the key components to realize wireless transmission of RF signals. The main function of the RF power amplifier is to amplify the modulated RF signal to the required power value and transmit it to the antenna for transmission to ensure that the receiver in a certain area can receive the signal. As a key component of the radio frequency power amplifier, its performance has a direct impact on the communication quality. The RF power transistor is the core component of the RF power amplifier, and its working state is determined by the bias circuit, so the characteristics of the bias circuit directly affect the performance of the power amplifier. When the temperature change causes the junction voltage drop of the transistor to ...
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IPC IPC(8): H03F3/21H03F1/30
Inventor 陈俊
Owner RDA TECH