US Patent No: 6,034,566

Number of patents in Portfolio can not be more than 2000

Tuning amplifier

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
IKEDA, TAKESHITOKYO4
TAKESHI IKEDATOKYO5

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ohe, Tadataka 10-7-203, Higashiohmiya2-chome, Ohmiya-shi Saitama 330, JP 4 81

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Other [Check patent profile for assignment information] (1)
5,886,580 Tuned amplifier 9 1997

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (59)
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7,379,515 Phased array antenna applications of universal frequency translation 46 2001
7,236,754 Method and system for frequency up-conversion 54 2002
7,460,584 Networking methods and systems 32 2002
7,379,883 Networking methods and systems 42 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 45 2002
7,272,164 Reducing DC offsets using spectral spreading 49 2002
7,389,100 Method and circuit for down-converting a signal 41 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 44 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 33 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 45 2004
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 20 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 54 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 35 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 44 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 32 2004
7,773,688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 26 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 52 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 25 2005
7,245,886 Method and system for frequency up-conversion with modulation embodiments 52 2005
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 32 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 36 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 90 2005
7,218,907 Method and circuit for down-converting a signal 52 2005
7,697,916 Applications of universal frequency translation 23 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 41 2006
7,653,158 Gain control in a communication channel 27 2006
7,693,230 Apparatus and method of differential IQ frequency up-conversion 30 2006
7,724,845 Method and system for down-converting and electromagnetic signal, and transforms for same 24 2006
7,599,421 Spread spectrum applications of universal frequency translation 30 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 31 2006
8,160,196 Networking methods and systems 10 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 33 2007
7,936,022 Method and circuit for down-converting a signal 16 2008
7,554,508 Phased array antenna applications on universal frequency translation 33 2008
7,991,815 Methods, systems, and computer program products for parallel correlation and applications thereof 15 2008
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7,693,502 Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships 23 2008
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7,865,177 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 17 2009
7,826,817 Applications of universal frequency translation 21 2009
7,894,789 Down-conversion of an electromagnetic signal with feedback control 17 2009
8,019,291 Method and system for frequency down-conversion and frequency up-conversion 15 2009
8,233,855 Up-conversion based on gated information signal 9 2009
8,446,994 Gain control in a communication channel 7 2009
7,929,638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 16 2010
8,036,304 Apparatus and method of differential IQ frequency up-conversion 15 2010
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 9 2010
8,077,797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 16 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 8 2010
8,160,534 Applications of universal frequency translation 10 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 10 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 9 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 9 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 10 2011
8,190,108 Method and system for frequency up-conversion 9 2011
8,594,228 Apparatus and method of differential IQ frequency up-conversion 1 2011
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
7,116,163 Buffer circuit 6 2004
 
MICRO-EPSILON MESSTECHNIK GMBH & CO. KG (1)
7,808,314 Circuit for adjusting an impedance 0 2007
 
NATIONAL SEMICONDUCTOR CORPORATION (1)
6,492,876 Low power analog equalizer with variable op-amp gain 16 2001
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 26 2007