ADS design amplifier example Using ADS to simulate and design a low-noise amplifier Abstract: This paper gives the design method and steps of using ADS to simulate and design a low-noise amplifier, and also gives the optimized simulation results of the circuit and the qualified rate of circuit performance in mass production. It can be seen from the design method that using ADS to simulate microwave circuits can not only easily obtain the best circuit design, but also simulate and analyze the tolerance characteristics of microwave circuits, which is a good tool for microwave product design. Keywords: S parameter simulation, noise figure, stability, YIELD, YIELD optimization simulation. 1. Introduction: ADS software is very convenient for simulation analysis and design of RF circuits. Usually, S parameter simulation can be performed for small signal characteristics, and the noise figure, input and output standing wave ratio, gain and stability of the circuit can be obtained. In the electrical principle analysis, the simulator YIELD can be used to analyze the qualified rate of the circuit, and the simulator YIELDOPTIM can be used to optimize the maximum qualified rate of the circuit, so as to obtain the best tolerance design of the circuit. Using ADS software to design a low-noise amplifier We will use the above tools to design and optimize the circuit, output a product design with a high pass rate, and lay a good foundation for the successful development of the final product. 2. Design goal In the field of wireless communication, in order to improve the sensitivity of the received signal, a low-noise amplifier is generally placed at the front end of the receiver. Since the noise factor of the low-noise amplifier is small, and after the reasonable gain distribution of the receiving system, the noise factor is mainly determined by the low-noise amplifier, therefore, reducing the noise factor of the low-noise amplifier is a key means to improve the receiving sensitivity. This article describes the design method of the first stage of the circuit using the PHEMT field effect tube ATF34143. For the second stage of the circuit and subsequent circuits, MMIC microwave monolithic amplifiers can be used. Therefore, the key design of the low-noise amplifier is the first stage of the circuit. The design goals of the first-stage low-noise amplifier we completed using ATF34143 are: Frequency: 1710MHZ~1980MHZ Gain: greater than 12dB Gain flatness: less than 0.2 dB in every 5MHZ band Input return loss: less than 1.5 ……
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