Voltage control attenuator, method for realizing voltage control attenuator and application circuit
A voltage-controlled attenuation and control circuit technology, applied in electrical components, transmission control/equalization, impedance network, etc., can solve problems such as inability to apply high power, poor linearity, etc., to facilitate device replacement and debugging, and good versatility , good linear effect
Inactive Publication Date: 2010-05-26
SHENZHEN GRENTECH CO LTD
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Problems solved by technology
[0009] The purpose of the present invention is to propose a voltage-controlled attenuator and its implementation method, and the automatic potential control circuit realized by using the voltage-controlled attenuator, so as to solve the problem of voltage-controlled attenuation in the communication radio frequency module currently used by the integrated variable gain amplifier tube. There are technical problems such as poor linearity and inability to apply to high-power situations when using
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[0033] See figure 2 Shown is a schematic diagram of the circuit structure of a preferred specific implementation example of the voltage-controlled attenuator of the present invention. The present invention proposes a voltage-controlled attenuator based on a four-port network, which changes the internal impedance of the network through the magnitude of the voltage, and correspondingly realizes changing the attenuation of the attenuator.
[0034] The voltage-controlled attenuator of the present invention specifically includes:
[0035] The transmission matching network 210 has a radio frequency signal input terminal (port1), a radio frequency signal output terminal (port2), a coupling output terminal (port3) and a through output terminal (port4), and the coupling output terminal and the through output terminal are respectively connected to the first and the second The RF signal input terminals of the two attenuation matching networks 220 and 230 are connected, and the coupled ...
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The disclosed voltage control attenuator includes following parts: transmission - matching network (TMN) with the input end of RF signal, the output end of RF signal, coupling out end, and straight through output end; first and second attenuation - matching network (AMN), and its input ends of RF signal connected to the coupling out end and straight through output end of TMN; the coupling out endand straight through output end of first and second AMN are connected to loads with resistance values varied following offset voltage respectively. Changing offset voltage of load, the method changestransmission attenuation characteristic of TMN controllably as resistance of load changes. The voltage control attenuator possesses good linear performances of indexes, simple structure, and good versatility.
Description
technical field [0001] The invention relates to radio frequency technology in the field of wireless communication, in particular to a broadband high-linear voltage-controlled attenuator and a realization method thereof, and an automatic level control circuit realized by using the voltage-controlled attenuator. Background technique [0002] With the continuous development of the modulation technology of the third generation mobile communication system, the mobile communication has higher and higher indicators for the linearity of the automatic level control circuit (Automatic Level Control, ALC) in the radio frequency system under the condition of deep control. Require. In modern wireless communication systems, the wireless environment becomes very harsh with the reduction of available spectrum resources, and the interference between different systems and the same system becomes more and more. Strong interference signals will cause the system to fail to work normally. Seriou...
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IPC IPC(8): H04B7/005H03H7/00
Inventor 杨磊
Owner SHENZHEN GRENTECH CO LTD