Radio frequency power amplifier circuit and radio frequency transmitter
An amplifier circuit and power amplifier technology, which is applied in the field of radio frequency communication, can solve the problems of fast turn-on and turn-off speed of power amplifiers, spectrum leakage, etc., and achieve the effects of reducing spectrum leakage, slowing down the speed of voltage change, and avoiding sudden changes in driving voltage
Active Publication Date: 2015-07-01
SHANGHAI EASTSOFT MICROELECTRONICS
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[0004] However, from figure 2 It can be seen from the figure that although Vramp has achieved slow change as a whole, the change speed of Vramp is still relatively fast, resulting in a faster turn-on and turn-off speed of the power amplifier, resulting in spectrum leakage
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[0028] Using the existing load circuit at the input end of the power amplifier, although the voltage Vramp of the power control analog signal has achieved a gradual change as a whole, the change speed of Vramp is still relatively fast, resulting in a relatively fast turn-on and turn-off of the power amplifier, resulting in spectrum leakage Case.
[0029] In the embodiment of the present invention, the variable current source outputs currents of different current values to the load circuit, and corresponding different voltage values are generated on the load circuit. After the second resistor in the load circuit is connected in series with the nonlinear device, and then connected in parallel with the first resistor, the voltage of the power control analog signal input to the power amplifier is equal to the voltage drop on the second resistor, the voltage drop on the nonlinear device and the voltage drop on the first resistor. The sum of the voltage drops across a Zener diod...
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The invention provides a radio frequency power amplifier circuit and a radio frequency transmitter. The radio frequency power amplifier circuit comprises a variable current source, a load circuit and a power amplifier, wherein the variable current source is coupled with the load circuit, the load circuit comprises a first resistor, a second resistor, a nonlinear device and a first voltage-stabilizing diode, the first end of the first resistor is coupled with the output end of the variable current source, the second end of the first resistor is coupled with the anode of the first voltage-stabilizing diode, the first end of the second resistor is coupled with the output end of the variable current source, the second end of the second resistor is coupled with the first end of the nonlinear device, the second end of the nonlinear device is coupled with the anode of the first voltage-stabilizing diode, the cathode of the first voltage-stabilizing diode is coupled with the ground, the first input end of the power amplifier is coupled with the output end of the load circuit, and a radio frequency signal to be transmitted is input to the second input end of the power amplifier. Due to the scheme, the changing speed of the input voltage of the power amplifier can be decreased, and therefore spectrum leakage in the switching process of the power amplifier can be reduced.
Description
technical field [0001] The invention relates to the field of radio frequency communication, in particular to a radio frequency power amplifier circuit and a radio frequency transmitter. Background technique [0002] In modern wireless radio frequency communication technology, a power amplifier (Power Amplifier, PA) is a device that amplifies the power of a signal to be transmitted, and is an essential device in a radio frequency transmitter. When the power amplifier is turned on or off, if the power changes too fast, interference signals of other frequency points will appear on the transmission spectrum of the power amplifier, which will affect the normal operation of other devices and reduce the performance of the entire communication system. [0003] refer to figure 1 , gives a schematic structural diagram of an existing load circuit at the input end of a power amplifier, including a variable current source and a load resistor R 1 . The output current of the variable cu...
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IPC IPC(8): H03F3/20H03F3/189H04B1/02
Inventor 刘瑞金张旭潘松张晓诗
Owner SHANGHAI EASTSOFT MICROELECTRONICS