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| Number | Title | Issue Date |
| 7368995 | Power amplifier with active bias circuit A power amplifier with an active bias circuit and operating method thereof are provided. The power amplifier comprises a power amplifier transistor and an active bias circuit. The active circuit receives input power and applies a bias voltage to the gate of the powe... | 05/06/2008 |
| 7368990 | Differential amplifier and data driver employing the differential amplifier Disclosed is a differential amplifier which includes first and second input terminals, an output terminal, first and second differential pairs, and first and second current sources for supplying currents to the first and second differential pairs. The first differen... | 05/06/2008 |
| 7233201 | Single-ended pseudo-differential output driver A differential pair of transistors includes a first transistor and a second transistor having their sources coupled together. Their sources are further coupled to ground via a pull-down network. A single-ended output is coupled to the drain of the second of the pair... | 06/19/2007 |
| 7199665 | Single to dual non-overlapping converter A converter includes an input circuit to receive a single-ended input signal to generate a number of control signals. The control signals have a delay different from one another relative to the single-ended input signal. The converter also includes a first output ci... | 04/03/2007 |
| 7145392 | Methods and apparatus for variable harmonic distortion Methods and apparatus for producing first and second drive signals from an input signal such that each drive signal is about 180 degrees out of phase with respect to the other; variably altering at least one of the first and second drive signals such that their resp... | 12/05/2006 |
| 7107025 | High gain, highly linear mixer A high gain, highly linear mixer includes an input section, mixing section, at least one tuning component, and at least one stand by current source. The input section is operably coupled to receive an input voltage signal and perform a linear transconductance thereo... | 09/12/2006 |
| 7088184 | High frequency amplifier in an integrated circuit The invention concerns an integrated circuit amplifier designed to supply an amplified signal at a power of a few hundreds of milliwatts at frequencies from one to several Gigahertz. The final stage of the amplifier comprises two signal amplification input points E ... | 08/08/2006 |
| 7088185 | Antenna diversity structure for use in a radio frequency integrated circuit A radio frequency integrated circuit includes a power amplifier, a low noise amplifier, a first transformer balun, and a second transformer balun. The power amplifier includes a first power amplifier section and a second power amplifier section. When enabled, the fi... | 08/08/2006 |
| 7015756 | Push-pull buffer/amplifier A differential circuit comprises first, second, third and fourth devices that have first, second, third and fourth control terminals, respectively. The second and fourth devices are arranged in series with the first and third devices, respectively. A first output co... | 03/21/2006 |
| 6958650 | Push-pull buffer/amplifier A differential circuit includes first, second, third, and fourth transistors each having a control terminal, a first terminal and a second terminal. A first input terminal communicates with the control terminals of the second and third transistors. A second input te... | 10/25/2005 |
| 6900705 | Balanced high-frequency device and balance-characteristics improving method and balanced high-frequency circuit using the same A balanced high-frequency device is constituted by a balanced device and a phase circuit. The input side of the balanced device is connected to an input terminal IN serving as an unbalanced input/output terminal and the output side of it is connected to output termi... | 05/31/2005 |
| 6891432 | Apparatus, methods and articles of manufacture for electromagnetic processing Apparatus, methods and articles of manufacture are shown for modifying electromagnetic waves. Through using various wave characteristics such as amplitude to regulate a current source, a current is output that may be used in any number of ways, such as driving an an... | 05/10/2005 |
| 6882228 | Radio frequency integrated circuit having an antenna diversity structure A radio frequency integrated circuit includes a power amplifier, a low noise amplifier, a first transformer balun, and a second transformer balun. The power amplifier includes a first power amplifier section and a second power amplifier section. When enabled, the fi... | 04/19/2005 |
| 6813486 | RF circuit An RF circuit configured to inteface a balanced port (1, 2, 11, 12) with an unbalanced port (4, 14) by emulating the function of a balun. Reactive components (20, 30, 120, 130) in both branches of a balanced circuit form two resonant circuits by... | 11/02/2004 |
| 6636116 | Fully differential current feedback amplifier A current feedback amplifier is disclosed for providing a differential output based on a single-ended or differential input signal, having first and second low impedance inputs to receive first and second input signals, and first and second phase shifting... | 10/21/2003 |
| 5844443 | Linear high-frequency amplifier with high input impedance and high power efficiency A high-frequency power amplifier circuit offers the advantages of high input impedance, good linearity, high power efficiency and accurate bias current control in a compact and economical circuit configuration. The amplifier includes a single-ended output... | 12/01/1998 |
| 5828269 | High-frequency amplifier with high input impedance and high power efficiency A high-frequency power amplifier circuit offers the advantages of high input impedance, high power efficiency and accurate bias current control in a compact and economical circuit configuration. The amplifier includes a single-ended output stage driven by... | 10/27/1998 |
| 5781072 | Dual push-pull amplifier circuit and method An amplifier circuit (30) has the capability for driving a large number of loads while still maintaining the desirable gain response. The amplifier circuit (30) includes two push-pull amplifier circuits (31 and 41). A first push-pull amplifier circuit (31... | 07/14/1998 |
| 5778303 | Multiplexed audio-video signal transmission system through pair-wire A multiplexed audio-video signal transmission system has a camera-equipped intercom which produces a balanced audio-video signal. A twisted pair-wire connected to the intercom transmits a multiplexed signal of audio signal, video signal modulated to a fre... | 07/07/1998 |
| 5684432 | Amplifier output stage having enhanced drive capability The invention is an operational amplifier having an output stage for enhancing the output driver capability near the negative source voltage. The output stage of the invention includes a voltage detector in combination with a current redirector or redirec... | 11/04/1997 |
| 5420536 | Linearized power amplifier A linearized power amplifier is provided which comprises a non-linear radio frequency (RF) power amplifier, a linearization circuit such as a Cartesian Feedback circuit, an RF feedback circuit; an IF feedback circuit; or a feedforward circuit, and a dynam... | 05/30/1995 |
| 5382919 | Wideband constant impedance amplifiers A family of wideband amplifier circuits using series and shunt feedback over two stages to achieve constant impedance, including single-ended, single-ended input/differential output and differential input/differential output forms.... | 01/17/1995 |
| 5285170 | Operational amplifier with all NPN transistor output stage An operational amplifier achieves higher operating speed by using an all NPN transistor output drive stage. A control circuit in output drive stage receives an input signal and providing first and second control signals. The first and second control signa... | 02/08/1994 |
| 5243623 | Switchable multi-mode transceiver interface device A transceiver interface device in accordance with the present invention includes features which allow the transceiver to be switched for operation in either a differential or a single-ended mode. First, the output levels of the transceiver's differential ... | 09/07/1993 |
| 5204880 | Differential line driver employing predistortion A two terminal line driver employing predistortion is disclosed, for driving data over a lossy transmission line such as a twisted pair cable at speeds on upwards of 10 Mbit/s. The driver is designed for voltage output operation wherein fullstep and halfs... | 04/20/1993 |
| 5107223 | Phase inverter and push-pull amplifier using the same A phase inverter includes first, second, third and fourth terminals, a first coupling circuit coupled between the first and second terminals, a second coupling circuit coupled between the second and third terminals, a third coupling circuit coupled betwee... | 04/21/1992 |
| 5061910 | Balun transformers A balun is formed by printed tracks (20,22) on a printed circuit board. A first conductor to one side of the board extends between ground (13) and single ended signal port 11. A second conductor to the other side of the board extends between ground 21 and... | 10/29/1991 |
| 5057719 | Passively forced current sharing among transistors This application concerns a simple passive circuit that improves current balance in paralleled power MOSFETs that are not precisely matched and that are operated in their active region from a common gate drive. A nonlinear circuit consisting of diodes and... | 10/15/1991 |
| 5053719 | Wide-band push-pull amplifier A radio frequency amplifier includes a first pair of quadrature couplers arranged to provide in response to an input signal first and second radio frequency signals having equal amplitudes and a first single-ended amplifier is fed by said first radio freq... | 10/01/1991 |
| 4994755 | Active balun A double balun circuit is provided by connecting two pairs of circut types. The first circuit, a distributed divider circuit, includes first and second pluralities of field effect transistors, a common input transmission line, and a first and second outpu... | 02/19/1991 |
| 4713838 | Amplifier with double rail output An amplifier with double rail output being a switchable to single rail output is provided by power pumping circuitry which is controllable by an error detector to deliver modulated power pulses from a d.c. power source to on-following current steering cir... | 12/15/1987 |
| 4705967 | Multifunction floating FET circuit A transistor circuit is provided with a symmetrical floating configuration for attaining multifunction operation of a transistor having symmetrical source and drain characteristics, preferably a GaAs MESFET. The circuit includes a balun which may be confi... | 11/10/1987 |
| 4633191 | Transformer isolated high voltage, high power amplifier system A transformer isolated high voltage, high power system is disclosed which is suitable for driving servo motors in servo loop control systems or the like. A D.C. current control loop is provided for preventing transformer saturation without gapping the tra... | 12/30/1986 |
| 4611178 | Push-pull output circuit A low voltage sixteen bit digital-to-analog converter operable between +5 and -5 volt power supplies and capable of providing output voltage levels to within about 1.4 volts of +VCC and -VCC includes a push-pull output stage with onl... | 09/09/1986 |
| 4587494 | Quasi-complementary class B IC output stage A class B IC transistor output stage, using a pair of NPN transistors, is described. A quasi-complementary transistor is employed to establish the stage quiescent bias. An NPN bias transistor is coupled to the output sink transistor and is driven from the... | 05/06/1986 |
| 4553073 | Deflection control circuit with level conversion A deflection control circuit for a plural-tube color television camera adjusts the deflection sawtooth waves furnished to the red and blue image pickup tubes to register the images thereof with the image of the green pickup tube, and eliminate any centeri... | 11/12/1985 |
| 4538116 | Output stage for an operational amplifier An operational amplifier includes an input stage, an output stage including first, second and third NPN output transistors, and an intermediate stage. The first NPN output transistor sources load current to an output terminal while the second and third ou... | 08/27/1985 |
| 4453134 | High voltage operational amplifier An operational amplifier is disclosed which is capable of handling input voltages in excess of 200 volts, comprising at least in the input stage thereof a plurality of low voltage transistors including at least a pair of low voltage lateral PNP transistor... | 06/05/1984 |
| 4405902 | Push-pull output stage The invention provides an improved class-B push-pull output stage comprising a first and a second output transistor of a first conductivity type, which stage is provided with a control loop for driving the second transistor in phase opposition as a functi... | 09/20/1983 |
| 4355287 | Bridge amplifiers employing complementary field-effect transistors A bridge amplifier is provided wherein one end of a load device is driven by a first amplifier and the other end of the load device is driven by a second amplifier. The second amplifier is an inverting amplifier comprising P and N-channel field-effect tra... | 10/19/1982 |
