Bias control circuit and control method of a radio frequency power amplifier
A power amplifier and radio frequency power technology, which is applied in the direction of radio frequency amplifiers, power amplifiers, high frequency amplifiers, etc., can solve the problems of reducing amplifier efficiency and achieve the effect of improving efficiency
Active Publication Date: 2019-11-15
RDA MICROELECTRONICS SHANGHAICO LTD
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AI Technical Summary
Problems solved by technology
[0008] figure 2 The existing bias control method of the radio frequency power amplifier of the dynamic switch shown, the existing problem is that it is difficult to strike a balance between the efficiency and the dynamic error vector magnitude
The disadvantage of this scheme is that each turn-on requires an additional smoothing current, thus reducing the efficiency of the amplifier
Method used
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Embodiment Construction
[0024] see image 3 , which is the first embodiment of the bias control circuit of the RF power amplifier with dynamic switching provided by the present application, which is mainly composed of a controller and a delay detection circuit.
[0025] The controller includes a control circuit M1 and a plurality of low dropout regulators, image 3 Four low dropout voltage regulators LDO1 to LDO4 are schematically shown in . One input terminal of the control circuit M1 is the opening and closing control port PAEN of the power amplifier, and the other input terminals are the output terminals of each voltage comparator in the delay detection circuit, and each output terminal of the control circuit M1 determines whether each low dropout voltage regulator is open. When the ON / OFF control port PAEN of the power amplifier receives an ON signal (such as a high level), the control circuit M1 works, and determines which LDO voltage regulator according to the output levels of each voltage co...
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The invention discloses a bias control circuit for a radio frequency power amplifier. The bias control circuit comprises a controller and a time-delay detection circuit. The controller comprises a control circuit and a plurality of low-dropout voltage stabilizers, when at work, the control circuit decides which low-dropout voltage stabilizer is to be opened in dependence on output of each voltage comparator in the time-delay detection circuit. The time-delay detection circuit comprises a demodulation circuit, a series connecting branch circuit and at least one comparator. The demodulation circuit comprises a first diode, a fifth resistor and a first capacitor. The series connecting branch circuit provides at least one reference voltage value by means of a plurality of resistors connected in series. Each comparator comprises two input terminals and an output terminal, one input terminal receives the output voltage of the demodulation circuit, the other input terminal receives one reference voltage value of the series connecting branch circuit, and the output terminal is connected with the control circuit in the controller. On the premise that relatively-low dynamic error vector amplitude is always ensured, the efficiency of the radio frequency power amplifier is improved as much as possible.
Description
technical field [0001] The present application relates to a bias control circuit of a radio frequency power amplifier, in particular to a bias control circuit of a dynamic switch radio frequency power amplifier. Background technique [0002] Wireless local area network (wireless local area network, WLAN) adopts time-division duplexing (time-division duplexing, TDD) mode, the most common standard is the 802.11 series standards defined by IEEE, and the wireless local area network technology conforming to this series of standards is called WiFi. The WLAN communication device usually includes a radio frequency power amplifier at the end of the transmission channel, which is used to amplify the power of the transmission signal to meet the transmission requirements and then send it to the antenna for external transmission. In order to save power, the RF power amplifier is turned on when it needs to send a signal, and turned off when it does not need to send a signal. Therefore, t...
Claims
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IPC IPC(8): H03F1/02H03F3/19H03F3/21
CPCH03F1/0261H03F3/19H03F3/21H03F2200/451
Inventor 孙凯曲广文柯庆福郑新年
Owner RDA MICROELECTRONICS SHANGHAICO LTD