77GHz power amplifier applied to automotive radar system
A power amplifier and automotive radar technology, applied in power amplifiers, DC-coupled DC amplifiers, amplifiers, etc., can solve problems such as low linearity, low integration, and large volume, achieve good consistency, save chip area, and volume small effect
Pending Publication Date: 2017-06-13
CHENGDU AIJIELONG INFORMATION TECH
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Problems solved by technology
[0008] The purpose of the present invention is: in order to solve the technical problems of low linearity, large volume, high power consumption, high cost, and low integration due to the combination of multiple chips in the power amplifier of the 77GHz automotive millimeter-wave radar system, the present invention provides A fully integrated 77GHz power amplifier for automotive radar systems, which improves system stability and eliminates the impact of external environments on antennas and automotive anti-collision radars
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[0025] like figure 1 , 2 As shown, a 77GHz power amplifier used in automotive radar systems is designed using SiGe BiCMOS technology. At 77GHz, the substrate attenuates the signal greatly, and the gain and output power of the power amplifier are severely limited. Therefore, in The power amplifier in the present invention adopts a four-stage cascaded common-emitter amplification structure to improve the voltage gain and output power of the power amplifier circuit.
[0026] The circuit is composed of four-stage gain amplifier, input matching network, interstage matching network and output matching network. The power amplifier circuit adopts a class AB differential power amplifier structure, and the output of the class AB differential power amplifier is directly connected to the differential antenna, without on-chip balun switching, thereby saving chip area. The class AB differential power amplifier is realized by two identical single-ended amplifier circuits. The schematic dia...
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The invention discloses a 77GHz power amplifier applied to an automotive radar system. The circuit of the 77GHz power amplifier applied to an automotive radar system mainly comprises four stages of gain amplifiers and the matching networks; the matching networks comprise an input matching network connected to the input end of the gain amplifier, an inter-stage matching network between the adjacent stages of the four stages of gain amplifiers and an output matching network connected with the output of the gain amplifier; all of the four stages of gain amplifiers are class AB differential power amplifiers, and the output of each power amplifier is directly connected with the differential antenna without the transfer of the on-chip balun so as to save the chip area; and the matching mode of the matching networks is that the transmission line matches the MIM capacitor. According to the invention, the class AB differential power amplifier structure is adopted by the power amplifier circuit, the chip area is saved, the return loss is less than -15dB, the total gain of the circuit is 15dB, the 1dB compression power is 15dBm, and the PAE reaches 15%; therefore, the 77GHz power amplifier applied to an automotive radar system is a power amplifier with full integration, high linearity, low cost, small size and good consistency.
Description
technical field [0001] The invention relates to a radar power amplifier, in particular to a 77GHz power amplifier used in an automotive radar system, and belongs to the technical field of wireless electronic communication. Background technique [0002] With the development of the automobile industry, automobile safety performance has been paid more and more attention by manufacturers and consumers. Automobile traffic accidents occur frequently, causing significant loss of life and property. The safety of automobiles has also received widespread attention from the society. my country is a country with many natural disasters. There are often long-term foggy weather in a certain area, especially in Vehicles traveling on the expressway run into foggy or rainy days, and traffic accidents caused by rear-end collisions of automobiles are very likely to occur. People continue to put forward new requirements for functions such as car anti-collision, adaptive cruise, blind spot monito...
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IPC IPC(8): H03F3/45H03F3/24
CPCH03F3/24H03F3/4508H03F2200/451
Inventor 万佳谢军伟赵新强谢李萍杨宗帅
Owner CHENGDU AIJIELONG INFORMATION TECH