Tuning amplifier

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6034566
SERIAL NO

09051932

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A tuning amplifier 1 is provided with two cascade connected phase shifting circuits 10C and 30C and an adding circuit composed of a feedback resistor 70 and input resistor 74. The circuit 10C is constituted of an operational amplifier 12, a resistor 18 one end of which is connected to the inverting input terminal of the amplifier 18, a resistor 20 connected between the inverting input terminal and the output terminal of the amplifier 12, a series circuit which comprises a capacitor 14 and a variable resistor 16 and one end of which is connected to the other end of the resistor 18. The fluctuation of the output amplitude of the circuit 10C is suppressed when the tuning frequency of the circuit 10C is changed because the resistance of the resistors 18 and 20 are equal to each other. When the signal inputted to a voltage dividing circuit composed of resistors 21 and 23 is taken out as an output, the tuning amplifier 1 itself has a gain and the amplitude of the signal is amplified simultaneously with the tuning operation. The phase shifting circuit 30C has the same structure as that of the circuit 10C, and total phase shift by the circuits 10C and 30C is 360.degree. at a prescribed frequency. Therefore, the tuning amplifier 1 outputs only a signal having a prescribed frequency as a tuned signal.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
IKEDA, TAKESHITOKYO1
Takeshi IkedaTOKYO2

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ohe, Tadataka Saitama, JP 4 84

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
* 5886580 Tuned amplifier 10 1997
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
MICRO-EPSILON MESSTECHNIK GMBH & CO. KG (1)
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7236754 Method and system for frequency up-conversion 54 2002
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7379883 Networking methods and systems 42 2002
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7272164 Reducing DC offsets using spectral spreading 49 2002
* 2003/0181,186 Reducing DC offsets using spectral spreading 2 2002
7389100 Method and circuit for down-converting a signal 41 2003
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7454453 Methods, systems, and computer program products for parallel correlation and applications thereof 34 2003
7308242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 46 2004
* 2005/0009,494 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 3 2004
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* 7218899 Apparatus, system, and method for up-converting electromagnetic signals 62 2004
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7386292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 49 2004
7483686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 32 2004
7773688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 33 2004
7194246 Methods and systems for down-converting a signal using a complementary transistor structure 53 2004
7653145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 25 2005
7245886 Method and system for frequency up-conversion with modulation embodiments 52 2005
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* 2005/0143,042 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 5 2005
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7233969 Method and apparatus for a parallel correlator and applications thereof 90 2005
* 2005/0185,741 Method and apparatus for a parallel correlator and applications thereof 0 2005
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* 2006/0014,501 Applications of universal frequency translation 0 2005
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7599421 Spread spectrum applications of universal frequency translation 33 2006
* 2006/0280,231 Spread spectrum applications of universal frequency translation 5 2006
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8160196 Networking methods and systems 10 2006
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7826817 Applications of universal frequency translation 22 2009
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8019291 Method and system for frequency down-conversion and frequency up-conversion 15 2009
8233855 Up-conversion based on gated information signal 9 2009
8446994 Gain control in a communication channel 10 2009
7929638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 16 2010
8036304 Apparatus and method of differential IQ frequency up-conversion 17 2010
8223898 Method and system for down-converting an electromagnetic signal, and transforms for same 9 2010
8077797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 18 2010
8295800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 8 2010
8160534 Applications of universal frequency translation 10 2010
8340618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 11 2010
8224281 Down-conversion of an electromagnetic signal with feedback control 10 2010
8190116 Methods and systems for down-converting a signal using a complementary transistor structure 10 2011
8229023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 11 2011
8190108 Method and system for frequency up-conversion 9 2011
8594228 Apparatus and method of differential IQ frequency up-conversion 7 2011
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
* 6492876 Low power analog equalizer with variable op-amp gain 18 2001
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (2)
* 7116163 Buffer circuit 6 2004
* 2006/0022,754 Buffer circuit 0 2004
 
ESS TECHNOLOGY, INC. (1)
* 9595931 Two differential amplifier configuration 0 2014
 
UNIVERSITAT BERN (1)
7620378 Method and system for frequency up-conversion with modulation embodiments 27 2007
* Cited By Examiner