Radio frequency front-end circuit broadband compensation method based on conjugate double poles

Abstract

The invention relates to a radio frequency front-end circuit broadband compensation method based on conjugate double poles, and belongs to the technical field of electronic circuits. The method comprises the following steps: step 1, establishing an active radio frequency front-end circuit with a broadband compensation structure; 2, establishing a compensation circuit which comprises a resistor R1,a resistor R2, a resistor R3, a capacitor C1, a capacitor C2 and a capacitor C3; 3, establishing a transmission function H (S) of the active radio frequency front-end circuit; 4, calculating two poles generated by the compensation network according to the transfer function H (S); 5, adjusting the numerical value of each component in the compensation circuit to enable the first pole P1 and the second pole P2 to form a pair of conjugate poles, and generating amplitude-frequency gain at the pole frequency so as to compensate the radio frequency gain attenuation of the whole circuit. According tothe invention, the effect of expanding the input bandwidth of the system can be achieved, the dependence of the radio frequency front-end circuit on the performance of the device is reduced, and therealization of a generalized digital processing system of a software radio architecture is facilitated.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to a broadband compensation method for radio frequency front-end circuits based on conjugate double poles. Background technique [0002] Due to the pursuit of payload performance and cost, the concept of software radio, which can provide a single platform solution for multi-mode and multi-band wireless terminals of different communication standards, has received widespread attention in spacecraft products. Digital Intermediate Frequency Receiver (DIFR), as a key technology to realize software radio communication, has become a research hotspot of on-board wireless communication because of its good protocol compatibility and application flexibility. However, the software-definable advantages of DIFR are largely limited by the performance of its radio frequency front-end (RFE) circuit. At present, the design methods of RFE circuits include two types: active and passive. Amo...

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Problems solved by technology

Among them, the active RFE circuit mainly uses the operational amplifier to complete the single-ended / differential conversion, and provides a certain gain amplification. In order to obtain a high output swing and harmonic suppression capability, the active front-end drive circuit of the general radio frequency section uses a fully differential operational amplifier. Structure; the passive RFE circuit mainly uses Balun to complete the single-ended / differential conversion, which has the characteristics of high harmonic suppression and excellent noise figure. At present, the common limitation of these two types of circuits is that the input bandwidth of the circuit is determined by the frequency band range of the device itself

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