Class 334/56 - Inductor only modified or substituted by switching

Subclass of Class 334 - Tuners
Definition: Subject matter in which the element or elements substituted
No. of patents: 32
Last issue date: 04/03/2007

Number	Title	Issue Date
7200370	Power amplifier having enhanced swing cascode architecture A Radio Frequency (RF) power amplifier includes a transconductance stage, an AC coupling element, and a cascode stage. The transconductance stage is adapted to receive an input RF voltage signal and to produce an output RF current signal. The cascode stage is adapte...	04/03/2007
7173505	Tuning RF circuits using switched inductors provided in a monolithic integrated circuit A Radio Frequency (RF) circuit includes an active portion and a tuned portion. The active portion receives an RF signal and that operates upon the RF signal. The tuned portion couples to the active portion and includes a first inductor, a second inductor, and a swit...	02/06/2007
7071799	High performance switch for switched inductor tuned RF circuit A Radio Frequency (RF) circuit includes an active portion and a tuned portion. The active portion receives an RF signal and that operates upon the RF signal. The tuned portion couples to the active portion and includes a first inductor, a second inductor, and an NMO...	07/04/2006
6703920	Device and method for contactless transmission of power or data A device and a method for contactless transmission of data or power include an impedance which is connected into an LC resonant circuit only in a phasewise manner, in order to match a resonant frequency of the resonant circuit to an excitation frequency. ...	03/09/2004
6549096	Switched inductor/varactor tuning circuit having a variable integrated inductor The magnetic field of an inductor is decreased by the presence of one or more single loop windings positioned in proximity to the inductor. The single loop windings have open circuits that are selectively closed to magnetically couple the single loop wind...	04/15/2003
6420939	Oscillator having a tunable resonant circuit The oscillator having a tunable resonant circuit has a switch for expanding the tuning range, which is connected in series with two coils jointly determining the oscillation frequency of the resonant circuit. A further coil, which is coupled to the resona...	07/16/2002
6232847	Trimmable singleband and tunable multiband integrated oscillator using micro-electromechanical system (MEMS) technology A high-Q precision integrated reversibly trimmable singleband oscillator and tunable multiband oscillator are presented that overcome the problems laser trimming and solid state switches. This is accomplished using micro-electromechanical system (MEMS) te...	05/15/2001
6163238	Fast variable RF network inductor A variable RF inductor network having a plurality of coaxial cables with their respective outer conductors in electrical contact with each other, thereby forming a common outer conductor. This common outer conductor is connected to an RF ground and an RF ...	12/19/2000
6127900	Dual frequency synthesis system The present invention includes a Voltage Controlled Oscillator (VCO) having a resonant circuit capable of being quickly switched between two resonant frequencies in order to generate two different LO frequencies. In a preferred embodiment, the present inv...	10/03/2000
5872489	Integrated tunable inductance network and method An integrated, tunable inductance network features a number of fixed inductors fabricated on a common substrate along with a switching network made up of a number of micro-electromechanical (MEM) switches. The switches selectably interconnect the inductor...	02/16/1999
5808531	Voltage-controlled variable tuning circuit A tuning circuit is formed of inductors connected in series, voltage-controlled variable capacitance means connected in parallel to the inductors, switch means connected in parallel to one of the inductors and capacitance means connected in parallel to an...	09/15/1998
5473291	Solid state plasma chamber tuner A solid state automatic tuner is used in a plasma processing system for measuring and adjusting a voltage standing wave ratio of the system. The tuner has a switched variable inductor circuit controlled by an automatic control system coupled to an impedan...	12/05/1995
5461353	Printed circuit board inductor A multilayer printed circuit board (100) includes a plurality of layers (101, 102, 104, 106, 108 and 110). Located within intermediate layer (106) is an inductor (200) which is shielded by top layer ground plane (202) and bottom layer ground plane (204). ...	10/24/1995
5412310	Switchable inductor for strong currents Switchable inductors for strong currents are used especially in antenna tuning circuits. The value of the inductance between the terminals of the primary winding of an air-core static transformer is different depending on whether the secondary winding of ...	05/02/1995
5065121	Switchable resonator device A switchable resonator device having a selectable center frequency over a wide radio frequency range comprising a radio frequency signal input and output means, a resonator structure connected between the signal input and output means for respectively rec...	11/12/1991
5021758	Circuit arrangement comprising MESFET switched spiral inductor A circuit arrangement which includes a switched inductor comprises a spiral inductor and a MESFET coupled in parallel for switching the spiral inductor in and out of a circuit. The MESFET has at least two gates, at least one of which and at least one sect...	06/04/1991
4972509	Band switching circuit of a tuner In a tuner circuit in which a plurality of band signals are received by a single common high frequency amplifier stage, a band switching circuit switches a resonant circuit to λ/2 type when the amplifier stage receives the highest band signals and to λ/...	11/20/1990
4756024	RF-input circuit arrangement for a television tuner A circuit arrangement of input stages for a television tuner for the UHF, VHF and hyperband frequency bands in a continuous frequency range having primary bandpass filters for the UHF and VHF bands arranged in parallel, and connected to a signal input aer...	07/05/1988
4749974	Double-tuned circuit A double-tuned circuit is provided of the type comprising a primary tuning circuit including first and second resonance coils connected in series and a first switching diode interposed between the connection point of the first and second resonance coils a...	06/07/1988
4710973	Varactor diode tuner with band switched coils and lines A tuner in which a band switching signal corresponding to a channel selected from a plurality of UHF and VHF bands is generated to enable the formation of a suitable resonant circuit for receiving television signals of the selected channel. It includes a ...	12/01/1987
4710737	Band switching circuit tuner A band switching circuit of a tuner comprises a tuning circuit, a switching diode connected to the tuning circuit, a pair of band switching terminals coupled across the switching diode. A novel transistor is inserted between one of the band switching term...	12/01/1987
4701732	Fast tuning RF network inductor A variable inductor usable in a fast tuning RF network comprises a plurality of inductor switching circuits connected in series. Each inductor switching circuit includes an input terminal connected to a discrete inductor and to a PIN diode, and includes a...	10/20/1987
4607391	VHF/UHF band switching tuner including a second diode in band switch loop A band switching circuit for a tuner for receiving VHF and UHF channels comprises a tuning circuit including a switching diode having an anode and a cathode for band switching, a plurality of resistors connected to the anode and cathode of the switching d...	08/19/1986
4573211	Two-circuit resonant bandpass filter for television tuners The invention relates to a two-circuit resonant bandpass filter for television tuners for switching a first frequency band to a second frequency band. The bandpass filter has a common primary circuit to which two secondary circuits are coupled, a first of...	02/25/1986
4564843	Antenna with P.I.N. diode switched tuning inductors A tuned radio antenna for a frequency agile communication system has a plurality of tuning inductors in series with a short-circuiting switch for each inductor, each switch being formed by a pair or a plurality of pairs of P.I.N. diodes, control means bei...	01/14/1986
4502025	High speed PIN diode switched antenna coupler and method A high speed antenna coupler and method for rapidly switching binary weighted values of inductance and capacitance into and out of the circuit between an antenna and a utilization circuit without unacceptably degrading the coupler or slowing the switching...	02/26/1985
4379269	RF Amplifier having automatic gate bias switching in response to band selection Herein disclosed is an RF amplifier which is equipped with a high-frequency amplifying element such as a dual gate MOS FET having its first gate fed with a bias voltage and its second gate fed with an AGC voltage, in which a switching diode is fed with a ...	04/05/1983
4155060	Rotary preset tuner A rotary preset tuner comprising a plurality of adjustable memory slugs, a single tuning member capable of being rotated in any direction, a sliding member connected to variable condenser elements and arranged so as to enable reciprocating movement thereo...	05/15/1979
4153887	Electrically tunable bandpass filter A bandpass filter is described for filtering a television signal. The filter has a passband which may be selectively centered for filtering signals in one of two channels of the television receiver. The television channel at which the filter passband is c...	05/08/1979
4025857	Television tuner circuit In a VHF-UHF tuner, the signal from the VHF antenna is fed to a resonant circuit comprising a plurality of coils which are selectably shorted out by a channel selection switch to select the various channels. The output of the resonant circuit and the UHF ...	05/24/1977
3943471	Digital tuning device A digital tuning device for accurate selectable tuning of a resonant circuit. The inductive and capacitive elements of the resonant circuit are connected by a transformer device whose turns ratio is variable in accurate digital increments. Since the refle...	03/09/1976
3932824	Signal selective circuit In one aspect, the circuit has a first impedance element which preferably is in the form of a tapped inductor with a plurality of taps thereon, and a second impedance element which preferably is in the form of a capacitor. One terminal of the capacitor is...	01/13/1976

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Class 334/56 - Inductor only modified or substituted by switching