RECURSIVE FILTER CIRCUIT

RECURSIVE FILTER CIRCUIT

PROBLEM TO BE SOLVED: To provide a recursive filter circuit of which the size is small by reducing the number of emitter follower circuits in the recursive filter circuit.SOLUTION: The recursive filter circuit includes: a node B for adding a current Iin flowing in a bipolar transistor (Tr) 101 to a...

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1. Verfasser: KAMATA MIKIO
Format: Patent
Sprache:eng
Schlagworte:
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
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creator KAMATA MIKIO
description PROBLEM TO BE SOLVED: To provide a recursive filter circuit of which the size is small by reducing the number of emitter follower circuits in the recursive filter circuit.SOLUTION: The recursive filter circuit includes: a node B for adding a current Iin flowing in a bipolar transistor (Tr) 101 to a feedback current Ifb to generate a current I; a variable gain amplification unit that sets the current I to be a tail current, and includes a differential pair 100 including a bipolar Tr106 and a bipolar Tr103 into which a control signal for changing a gain is inputted and a resistive element 105 for converting a current flowing in the bipolar Tr106 to a voltage; an output unit 115 including a bipolar Tr113 for amplifying the converted voltage to generate an output signal; and a phase-shifting unit including a high-pass unit including a variable capacitance element 104, a circuit 114 for buffering a signal outputted from the high-pass unit, and a low-pass unit for performing frequency band restriction to the buffered signal via a variable capacitance element 109.
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a variable gain amplification unit that sets the current I to be a tail current, and includes a differential pair 100 including a bipolar Tr106 and a bipolar Tr103 into which a control signal for changing a gain is inputted and a resistive element 105 for converting a current flowing in the bipolar Tr106 to a voltage; an output unit 115 including a bipolar Tr113 for amplifying the converted voltage to generate an output signal; and a phase-shifting unit including a high-pass unit including a variable capacitance element 104, a circuit 114 for buffering a signal outputted from the high-pass unit, and a low-pass unit for performing frequency band restriction to the buffered signal via a variable capacitance element 109.</description><language>eng</language><subject>AMPLIFIERS ; BASIC ELECTRONIC CIRCUITRY ; CONTROL OF AMPLIFICATION ; ELECTRICITY ; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS ; RESONATORS</subject><creationdate>2011</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20111027&amp;DB=EPODOC&amp;CC=JP&amp;NR=2011217166A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=20111027&amp;DB=EPODOC&amp;CC=JP&amp;NR=2011217166A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KAMATA MIKIO</creatorcontrib><title>RECURSIVE FILTER CIRCUIT</title><description>PROBLEM TO BE SOLVED: To provide a recursive filter circuit of which the size is small by reducing the number of emitter follower circuits in the recursive filter circuit.SOLUTION: The recursive filter circuit includes: a node B for adding a current Iin flowing in a bipolar transistor (Tr) 101 to a feedback current Ifb to generate a current I; 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subjects AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CONTROL OF AMPLIFICATION
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
RESONATORS
title RECURSIVE FILTER CIRCUIT
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