FM HIGH FREQUENCY TUNING CIRCUIT

FM HIGH FREQUENCY TUNING CIRCUIT

PURPOSE:To prevent cross modulation and intermodulation due to an interference wave, by using a varactor diode as an input coupling capacitance connected to a tuning circuit and controlling the capacitor with a voltage proportional to a received electric field strength. CONSTITUTION:An input applied...

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1. Verfasser: MATOBA TSUNEAKI
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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creator MATOBA TSUNEAKI
description PURPOSE:To prevent cross modulation and intermodulation due to an interference wave, by using a varactor diode as an input coupling capacitance connected to a tuning circuit and controlling the capacitor with a voltage proportional to a received electric field strength. CONSTITUTION:An input applied to an antenna input terminal 1 is given to a tuning coil 3 via a DC-cut capacitor 27 and a varactor diode 28. On the other hand, a broad band AGC voltage from a level detector 24 is applied to a connection point with the capacitor 27 as a control voltage for the level detector 24 via a resistor 18. As the output voltage of the level detector 24 increases, the capacitance of the varactoradiode 28 is reduced, the Q of the tuning circuit is increased and the pass band characteristics can be narrowed. Thus, the attenuation of the interference wave is increased to a desire signal, allowing to improve the cross modulation and intermodulation.
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CONSTITUTION:An input applied to an antenna input terminal 1 is given to a tuning coil 3 via a DC-cut capacitor 27 and a varactor diode 28. On the other hand, a broad band AGC voltage from a level detector 24 is applied to a connection point with the capacitor 27 as a control voltage for the level detector 24 via a resistor 18. As the output voltage of the level detector 24 increases, the capacitance of the varactoradiode 28 is reduced, the Q of the tuning circuit is increased and the pass band characteristics can be narrowed. 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CONSTITUTION:An input applied to an antenna input terminal 1 is given to a tuning coil 3 via a DC-cut capacitor 27 and a varactor diode 28. On the other hand, a broad band AGC voltage from a level detector 24 is applied to a connection point with the capacitor 27 as a control voltage for the level detector 24 via a resistor 18. As the output voltage of the level detector 24 increases, the capacitance of the varactoradiode 28 is reduced, the Q of the tuning circuit is increased and the pass band characteristics can be narrowed. Thus, the attenuation of the interference wave is increased to a desire signal, allowing to improve the cross modulation and intermodulation.</description><subject>BASIC ELECTRONIC CIRCUITRY</subject><subject>CONTROL OF AMPLIFICATION</subject><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>TRANSMISSION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1982</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZFBw81Xw8HT3UHALcg0MdfVzjlQICfXz9HNXcPYMcg71DOFhYE1LzClO5YXS3AyKbq4hzh66qQX58anFBYnJqXmpJfFeAcGm5oaWZmbGJo7GxKgBAPdhIj4</recordid><startdate>19821202</startdate><enddate>19821202</enddate><creator>MATOBA TSUNEAKI</creator><scope>EVB</scope></search><sort><creationdate>19821202</creationdate><title>FM HIGH FREQUENCY TUNING CIRCUIT</title><author>MATOBA TSUNEAKI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPS57196634A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1982</creationdate><topic>BASIC ELECTRONIC CIRCUITRY</topic><topic>CONTROL OF AMPLIFICATION</topic><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>TRANSMISSION</topic><toplevel>online_resources</toplevel><creatorcontrib>MATOBA TSUNEAKI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>MATOBA TSUNEAKI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>FM HIGH FREQUENCY TUNING CIRCUIT</title><date>1982-12-02</date><risdate>1982</risdate><abstract>PURPOSE:To prevent cross modulation and intermodulation due to an interference wave, by using a varactor diode as an input coupling capacitance connected to a tuning circuit and controlling the capacitor with a voltage proportional to a received electric field strength. CONSTITUTION:An input applied to an antenna input terminal 1 is given to a tuning coil 3 via a DC-cut capacitor 27 and a varactor diode 28. On the other hand, a broad band AGC voltage from a level detector 24 is applied to a connection point with the capacitor 27 as a control voltage for the level detector 24 via a resistor 18. As the output voltage of the level detector 24 increases, the capacitance of the varactoradiode 28 is reduced, the Q of the tuning circuit is increased and the pass band characteristics can be narrowed. Thus, the attenuation of the interference wave is increased to a desire signal, allowing to improve the cross modulation and intermodulation.</abstract><oa>free_for_read</oa></addata></record>
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subjects BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
title FM HIGH FREQUENCY TUNING CIRCUIT
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