High-gain intermediate-frequency amplifier with body leakage cross coupling technology

Abstract

The invention belongs to the technical field of wireless communication, and particularly provides a high-gain intermediate-frequency amplifier with a body leakage cross coupling technology, which is used for solving the problem that the high-frequency gain of the existing intermediate-frequency amplifier needs to be improved. The circuit is composed of two parts, wherein one part is a common-source differential amplifier composed of MOS tubes M1 and M2, loads Load1 and Load2 and load capacitors CL1 and CL2, and the other part is a body-drain cross coupling structure composed of coupling capacitors C1 and C2 and bias resistors R1 and R2. On the basis of a traditional common-source amplifier structure, a body-drain cross coupling technology is introduced, a drain electrode of an MOS tube on one side of a differential pair is connected to a body electrode of an MOS tube on the other side through a coupling capacitor, static bias is provided for the body electrode through a bias resistor, the high-frequency gain of the amplifier is effectively improved, and the high-frequency gain of the amplifier is improved. The problem that the gain is reduced along with the frequency due to large load capacitance is solved; in addition, output voltage swing and power consumption do not need to be sacrificed while the high-frequency gain is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a core module in a radio frequency receiving link: an intermediate frequency amplifier, and specifically provides a high-gain intermediate frequency amplifier with body leakage cross-coupling technology. Background technique [0002] As a key module in the radio frequency receiving chain, the intermediate frequency amplifier needs to amplify the voltage amplitude of the intermediate frequency signal obtained by down-conversion; in the radio frequency receiving chain, the gain of the intermediate frequency amplifier is high, which can not only suppress the noise of the subsequent stage, but also control the overall The noise figure of the link can also drive the ADC and other modules behind the link even when the input signal is small, improving the overall performance of the digital-to-analog link. In recent years, with the rapid development of wireless communication tec...

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a high-gain intermediate frequency amplifier with body leakage cross-coupling technology for the problem that the high frequency gain of the existing intermediate frequency amplifier needs to be improved; the novel structure proposed by the invention adopts the body leakage cross coupling technology, without sacrificing Under the premise of output voltage swing and DC power consumption, the voltage gain of the intermediate frequency amplifier when processing MHz-level signals is effectively improved, and the high-frequency attenuation of the amplifier gain is effectively suppressed

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