Broadband switch control attenuation unit and broadband switch type attenuator
A switch control and switch-type technology, which is applied to frequency-independent attenuators, electrical components, networks using active components, etc., can solve the problem of limiting the frequency characteristics and bandwidth of the comprehensive attenuation degree, and achieve the expansion of frequency characteristics and bandwidth , Turn off the effect of parasitic capacitance improvement
Pending Publication Date: 2022-04-22
SHANGHAI HUAHONG GRACE SEMICON MFG CORP
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Problems solved by technology
T-type and π-type attenuation units are due to the off parasitic capacitance effect of the switch. In the reference state, the parallel switch off parasitic capacitance is a low-pass filter characteristic, and in the attenuation state, the series switch off parasitic capacitance is a high-pass filter characteristic, which limits its Frequency characteristics and bandwidth of comprehensive attenuation
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[0042] The specific embodiments of the present invention are given below in conjunction with the accompanying drawings, and the technical solutions in the present invention are clearly and completely described, but the present invention is not limited to the following embodiments. Apparently, the described embodiments are some, not all, embodiments of the present invention. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in very simplified form and use imprecise ratios, which are only used for the purpose of conveniently and clearly assisting in describing the embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0043] It should be understood that the invention can be embodied in different forms and should not be construed as limite...
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The invention discloses a T-shaped broadband switch control attenuation unit, a pi-shaped broadband switch control attenuation unit and an attenuator composed of the T-shaped attenuation unit and the pi-shaped attenuation unit. According to the invention, in order to solve the bandwidth problem of switching off a parasitic capacitor of a switch-type attenuator, parallel switch topology design of T-type and pi-type switch-type attenuation units is carried out, and a parallel switch compensation capacitor is added; the reference state turn-off stray capacitance is reduced, the low-pass filtering transmission characteristic is improved, the parallel compensation capacitor is used for compensating the series switch turn-off stray capacitance in the attenuation state, and the high-pass filtering transmission characteristic is converted into the low-pass filtering transmission characteristic, so that the frequency characteristic and the bandwidth are comprehensively and effectively expanded.
Description
technical field [0001] The invention relates to the field of semiconductor device design, in particular to a broadband switch control attenuation unit and a broadband switch attenuator designed for radio frequency front-end circuits. Background technique [0002] An attenuator is an electronic component that provides attenuation and is widely used in electronic equipment. Its main purpose is: (1) to adjust the size of the signal in the circuit; (2) in the comparison method measurement circuit, it can be used for direct reading The attenuation value of the network under test; (3) Improving impedance matching. If some circuits require a relatively stable load impedance, an attenuator can be inserted between this circuit and the actual load impedance to buffer impedance changes. An attenuator is a circuit used to introduce a predetermined attenuation within a specified frequency range. It is generally indicated by the decibel number of the attenuation introduced and the ohm nu...
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IPC IPC(8): H03H11/24
CPCH03H11/245
Inventor 戴若凡
Owner SHANGHAI HUAHONG GRACE SEMICON MFG CORP