US Patent No: 6,034,566

Number of patents in Portfolio can not be more than 2000

Tuning amplifier

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

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, TAKESHITOKYO4
TAKESHI IKEDATOKYO5

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ohe, Tadataka 10-7-203, Higashiohmiya2-chome, Ohmiya-shi Saitama 330, JP 4 80

Cited Art

Patent Info (Count) # Cites Year
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
5,886,580 Tuned amplifier 9 1997

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
PARKERVISION, INC. (56)
7,515,896 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 31 2000
8,295,406 Universal platform module for a plurality of communication protocols 3 2000
7,321,735 Optical down-converter using universal frequency translation technology 43 2000
7,379,515 Phased array antenna applications of universal frequency translation 45 2001
7,236,754 Method and system for frequency up-conversion 53 2002
7,460,584 Networking methods and systems 31 2002
7,379,883 Networking methods and systems 41 2002
7,321,751 Method and apparatus for improving dynamic range in a communication system 44 2002
7,272,164 Reducing DC offsets using spectral spreading 48 2002
7,389,100 Method and circuit for down-converting a signal 40 2003
7,321,640 Active polyphase inverter filter for quadrature signal generation 42 2003
7,454,453 Methods, systems, and computer program products for parallel correlation and applications thereof 32 2003
7,308,242 Method and system for down-converting and up-converting an electromagnetic signal, and transforms for same 44 2004
7,822,401 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 19 2004
7,218,899 Apparatus, system, and method for up-converting electromagnetic signals 53 2004
7,496,342 Down-converting electromagnetic signals, including controlled discharge of capacitors 32 2004
7,386,292 Apparatus, system, and method for down-converting and up-converting electromagnetic signals 42 2004
7,483,686 Universal platform module and methods and apparatuses relating thereto enabled by universal frequency translation technology 30 2004
7,773,688 Method, system, and apparatus for balanced frequency up-conversion, including circuitry to directly couple the outputs of multiple transistors 21 2004
7,194,246 Methods and systems for down-converting a signal using a complementary transistor structure 51 2004
7,653,145 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations 24 2005
7,245,886 Method and system for frequency up-conversion with modulation embodiments 49 2005
7,539,474 DC offset, re-radiation, and I/Q solutions using universal frequency translation technology 30 2005
7,433,910 Method and apparatus for the parallel correlator and applications thereof 35 2005
7,233,969 Method and apparatus for a parallel correlator and applications thereof 85 2005
7,218,907 Method and circuit for down-converting a signal 51 2005
7,697,916 Applications of universal frequency translation 22 2005
7,376,410 Methods and systems for down-converting a signal using a complementary transistor structure 40 2006
7,653,158 Gain control in a communication channel 25 2006
7,693,230 Apparatus and method of differential IQ frequency up-conversion 22 2006
7,724,845 Method and system for down-converting and electromagnetic signal, and transforms for same 23 2006
7,599,421 Spread spectrum applications of universal frequency translation 28 2006
7,529,522 Apparatus and method for communicating an input signal in polar representation 30 2006
8,160,196 Networking methods and systems 7 2006
7,546,096 Frequency up-conversion using a harmonic generation and extraction module 32 2007
7,936,022 Method and circuit for down-converting a signal 14 2008
7,554,508 Phased array antenna applications on universal frequency translation 32 2008
7,991,815 Methods, systems, and computer program products for parallel correlation and applications thereof 13 2008
7,937,059 Converting an electromagnetic signal via sub-sampling 14 2008
7,693,502 Method and system for down-converting an electromagnetic signal, transforms for same, and aperture relationships 21 2008
7,865,177 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 16 2009
7,826,817 Applications of universal frequency translation 20 2009
7,894,789 Down-conversion of an electromagnetic signal with feedback control 15 2009
8,019,291 Method and system for frequency down-conversion and frequency up-conversion 13 2009
8,233,855 Up-conversion based on gated information signal 4 2009
7,929,638 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 15 2010
8,036,304 Apparatus and method of differential IQ frequency up-conversion 13 2010
8,223,898 Method and system for down-converting an electromagnetic signal, and transforms for same 4 2010
8,077,797 Method, system, and apparatus for balanced frequency up-conversion of a baseband signal 13 2010
8,295,800 Apparatus and method for down-converting electromagnetic signals by controlled charging and discharging of a capacitor 3 2010
8,160,534 Applications of universal frequency translation 7 2010
8,340,618 Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships 4 2010
8,224,281 Down-conversion of an electromagnetic signal with feedback control 4 2010
8,190,116 Methods and systems for down-converting a signal using a complementary transistor structure 5 2011
8,229,023 Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments 4 2011
8,190,108 Method and system for frequency up-conversion 5 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 14 2001
 
UNIVERSITAT BERN (1)
7,620,378 Method and system for frequency up-conversion with modulation embodiments 25 2007
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (2)
8,407,061 Networking methods and systems 0 2008
8,446,994 Gain control in a communication channel 0 2009