Low differential loss, low phase shift, high integration five-bit stepping ultra-wideband digitally controlled attenuator

Abstract

A low-differential-loss low-phase-shift high-integration-level five-level marching type ultra-wide-band numerical control attenuator is formed by a single signal channel which comprises a transmission line TL0, an 8dB attenuation module of a pai-type structure, an inductor L1, a 0-7dB combined attenuation module of a T type-bridge T type combined structure, an inductor L2, a 16dB attenuation module of a pai-type structure and a transmission TL1 in a cascaded mode in sequence based on the RF CMOS technology. An MOS tube is used as a control switch, five independent control ends controls three attenuation modules to work, an inducting network is used for phase compensation, working frequency range is Ku wave band within the attenuation range of 0-31 dB with marching length of 1dB, and 32-state low-differential-loss low-phase-shift signal amplitude attenuation can be achieved. The attenuator has the advantages of being low in differential loss, low in additional phase shift, low in production cost, small in chip area and compatible with a digital processing module, and the attenuator can be used for single-chip ultra-wide-band communication system integration.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a five-bit stepping ultra-wideband numerical control attenuator with low differential loss, low phase shift and high integration in the technical field of radar, communication and guidance electronic components. The invention can be used for the attenuation function of low differential loss and low phase shift realized by signal amplitude in ultra-wideband communication systems, radio frequency radio systems, military communication systems, phased array systems, and space communication transceiver systems. Background technique [0002] At present, in the technical fields of radar, communication, and guidance electronic components, ultra-wideband numerical control attenuators are widely used in ultra-wideband communication systems, radio frequency radio systems, military communication systems, phased array systems, and space communication transceiver systems. The numer...

AI Technical Summary

Problems solved by technology

The disadvantage of the digitally controlled attenuator circuit disclosed in the patent application documents is that the reference state and the attenuation state of the attenuator are two signal paths respectively, which occupy a large chip area and reduce the integration level of the system chip integrated with this circuit The SPDT switch will not only increase the complexity of the circuit structure and occupy a large chip area, but also its large parasitic capacitance will introduce large insertion loss and additional phase shift in the signal path when the frequency is high

Although the numerically controlled attenuator disclosed in this patent application document has low insertion loss and additional phase shift, there are still shortcomings: the high electron mobility transistor of the GaAs process is used in the numerically controlled attenuator as the switch between different attenuation module states Control switch, high production cost, low yield; GaAs process is not compatible with the current silicon process used in VLSI manufacturing, which is not conducive to the realization of single-chip integrated ultra-wideband radio frequency microwave system

The disadvantages of the numerically controlled attenuator circuit disclosed in the patent application documents are: two signal channels with a numerically controlled attenuator structure are used for signal processing, which increases the complexity of the circuit structure and doubles the occupied chip area. greatly reduces the chip integration of the circuit

The numerically controlled attenuator also uses GaAs process field effect transistors as control switches. Although the attenuation range is large and the attenuation accuracy is high, there are still shortcomings: the overall numerically controlled attenuator is composed of multiple independent attenuation modules cascaded. , takes up a large chip area, and when used for ultra-wideband system integration, it will reduce the integration level of the system

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