Broadband working differential active inductor

Abstract

The invention discloses a broadband working differential active inductor, and relates to the field of radio frequency integrated circuits. The broadband working differential active inductor comprisesa first N-type MOS transistor (M1), a second N-type MOS transistor (M2), a third N-type MOS transistor (M3), a fourth N-type MOS transistor (M4), a fifth P-type MOS transistor (M5), a sixth P-type MOStransistor (M6), a seventh N-type MOS transistor (M7), an eighth N-type MOS transistor (M8), and an LC resonance circuit formed by connecting a passive inductor L and an MOS varactor in parallel. Thetransistors M1, M3, M2 and M4 form a differential active inductance framework, the transistors M5, M6, M7 and M8 form an active inductance bias current source, and the LC resonance circuit is added between the drain electrodes of the transistors M3 and M4 and between the grid electrodes of the transistors M1 and M2, so that a wide working band of the active inductance is realized, and a high Q value and a large inductance value can be tuned under broadband and high frequency.

Description

technical field [0001] The invention relates to the field of radio frequency devices and radio frequency integrated circuits, in particular to a radio frequency inductive element maintaining high Q value and large inductance value in a wide operating frequency band. Background technique [0002] Inductors are fundamental components in the design of radio frequency integrated circuits (RFICs) such as voltage-controlled oscillators, frequency dividers, and amplifiers. Although the on-chip passive spiral inductors that are often used at present have the characteristics of simple structure and no DC power consumption, they often have large area and large parasitic resistance and capacitance, resulting in low quality factor (Q value), small operating frequency and low inductance. The disadvantages such as non-adjustable value and Q value are more and more inconsistent with the trend of CMOS RFICs developing towards small area and high performance. [0003] The equivalent inducta...

AI Technical Summary

Problems solved by technology

For example, the widely used feedback resistor technology is effective for improving the Q value and inductance value of active inductors, but it is only limited to the lower frequency range, and cannot improve the working bandwidth and high frequency performance, making it difficult to obtain excellent active inductors. comprehensive performance

Images