Variable radio frequency signal phase-shifting circuit and its phase-shifting method

Abstract

The present invention discloses a variable radio frequency signal phase shift circuit, which comprises a 3dB electric bridge. Wherein, the 3dB electric bridge is connected with two resonance circuits. The resonance circuit is composed of a variable capacitance. One end of the variable capacitance is connected with the 3dB electrical bridge through a 50 Omega micro-strip line. In addition, the other end of the variable capacitance is grounded through a 50 Omega micro-strip line. The present invention also discloses a radio frequency signal phase shift method. The radio frequency signal enters into the 3dB electric bridge and then is divided into two totally symmetric paths, which respectively enter into two resonance circuits to adjust the variable capacitance and the 50 Omega micro-strip line of two resonance circuits, accordingly changing two paths of signals transmitting through a first and a second resonance circuit. And then, two paths of signals are reflected to the 3dB electric bridge for secondary synthesis and are output from one isolation terminal of the 3dB electric bridge. The present invention has the advantages of simple structure, easy execution, lower cost, large adjusting range, lower insertion loss and control over phase shift range of a phase shifter and stepping voltage.

Description

technical field [0001] The invention relates to a signal phase shifting circuit, in particular to a variable radio frequency signal phase shifting circuit. The invention also relates to a radio frequency signal phase shifting method. Background technique [0002] RF power amplifiers are widely used in the field of wireless communication. In recent years, with the increase of signal modulation methods, the efficiency and linearity requirements of power amplifiers are increasing, so feedforward technology is widely used in power amplifier design, and signal phase shifting is one of the core conditions for realizing this technology . [0003] In the past RF circuit phase shifter design, although the circuit shape is various, the principle is usually to use the signal to pass through the capacitor to generate phase shift, and only derive different circuits according to the application of the phase shifter in different environments. Design form and features. [0004] For exam...

AI Technical Summary

Problems solved by technology

At present, the phase shift range of the general-purpose variable phase shifter is about 100 degrees. If a larger range of phase shift range is to be obtained, 3 to 4 phase shifter circuits need to be cascaded, as shown in Figure 1, which increases the The complexity and cost of implementing the phase shifter function

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