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| Number | Title | Issue Date |
| 7368992 | Load-invariant amplifier A push-pull amplifier having low output impedance and low crossover distortion is provided. A least one of a current through a sourcing current path of an output stage and a current through a sinking current path of the output stage is determinative of a quiescent c... | 05/06/2008 |
| 7271655 | Power amplifier end stage In a push-pull power amplifier having an end stage (10) in which two power transistors (ML, MH) are connected in series, a dead time is normally used to ensure that the power transistors do not conduct simultaneously. The invention provides an end stage in wh... | 09/18/2007 |
| 6943629 | Transient protection circuit of Darlington amplifier A protection circuit for Darlington amplifiers prevents destructive voltage overshoot conditions from occurring. The Darlington amplifier has a pair of transistors connected in a Darlington configuration. A biasing network is coupled to the transistors for supplying... | 09/13/2005 |
| 6693490 | Adjustable gain control system and method thereof An adjustable gain control (AGC) system with improved gain control accuracy and method thereof is disclosed. The system includes an offset circuit for providing an offset signal that is selectable; a gain setting source for providing a gain set signal tha... | 02/17/2004 |
| 6630865 | Push-pull amplifiers A push pull amplifier is disclosed having upper and lower output devices operating in a mode in which the devices drive a load alternately. The amplifier includes bias means for providing a bias current to the output devices at all times. The bias means i... | 10/07/2003 |
| 6417733 | High output voltage swing class AB operational amplifier output stage An output stage (10) is provided having transistors of the same polarity type, which function to amplify the input signal at a wide range of frequencies, with low power consumption and low crossover distortion. By biasing the output transistors to remain ... | 07/09/2002 |
| 6369653 | Apparatus and methods for improved control of quiescent state of output transistors in a class AB amplifier A class AB amplifier biasing circuit is provided for controlling the quiescent state of a pull-up output device and a complimentary pull-down output device. The biasing circuit includes first and second current sources, each having a floating resistor con... | 04/09/2002 |
| 6353298 | Low distortion audio range class-AB full H-bridge pre-driver amplifier A circuit (40) and method for applying drive voltages to a voice coil motor (VCM) (22) of a mass data storage device (10) has two driver sets, each having a high side driver (HSD) (42,46) and a low side driver (LSD) (44,48) connected to the VCM (22). Each... | 03/05/2002 |
| 6292057 | Output stage of an operational amplifier and method having a latchup-free sourcing current booster for driving low impedance loads Responsive to an external load, an output stage (201) of an amplifier (200) in accordance with the present invention provides a current boosting scheme capable of generating a large output current while maintaining a low quiescent current. The output stag... | 09/18/2001 |
| 5952881 | Power stage, particularly for an operational amplifier A power stage for an operational amplifier includes an output stage, a current source stage, and a gain stage. The output stage is formed by first and second NPN output transistors arranged in a Totem-Pole configuration, each having respective resistors c... | 09/14/1999 |
| 5889433 | Amplifier having a high current efficiency While no signals are being supplied to first and second drive circuits, the drive circuits keep supplying idling currents to the bases of first and second transistors which constitute a push-pull amplifier. A first control circuit is provided in the base-... | 03/30/1999 |
| 5751555 | Electronic component having reduced capacitance An electronic component with reduced capacitance includes a substrate (12) with an interconnect line (14), an additional substrate (11) with an interconnect line (13) wherein the substrate (12) overlies the additional substrate (11), an electronic device ... | 05/12/1998 |
| 5500625 | Controlled current output stage amplifier circuit and method An amplifier circuit (10) is provided. The amplifier (10) includes an amplifier stage (14) coupled to an output stage (18). Output stage (18) comprises a sourcing circuit (20) and a sinking circuit (22). The current in sinking circuit (22) is approximatel... | 03/19/1996 |
| 5361041 | Push-pull amplifier An improved push-pull amplifier having a driver circuit for driving a source follower output transistor. The driver circuit includes a replicating transistor having electrical characteristics substantially similar to those of the source follower transisto... | 11/01/1994 |
| 5160897 | Push-pull power amplifying circuit The present invention provides a B class push-pull amplifying circuit suitable for use in a headphone type tape recorder and the like. The amplifying circuit utilizes a current mirror circuit system in its output transistors to provide an idling current f... | 11/03/1992 |
| 5019789 | Adaptive bias circuit for preventing turnoff in a push-pull stage A push-pull amplifier circuit includes an NPN pullup transistor and an pulldown transistor, an emitter of the pullup transistor being coupled to a collector of the pulldown transistor. A first resistor is coupled between an output conductor and the emitte... | 05/28/1991 |
| 4803442 | Low power buffer amplifier A current amplifier is provided with three active transistors of the same polarity type, which function to amplify the input signal at a wide range of frequencies, with low power consumption and low or no output crossover distortion. One transistor, in co... | 02/07/1989 |
| 4647866 | Audio amplifier output stage Apparatus and method for driving a non-centertapped load such as a loudspeaker from a low voltage supply such as a single dry cell, with increased efficiency. A push-pull signal having similar polarity voltage excursions is applied to opposite terminals o... | 03/03/1987 |
| 4587491 | IC class AB amplifier output stage A class AB monolithic silicon IC output stage is shown wherein the main output transistors are NPN structures. The current sourcing transistor is provided with an additional scaled down reference emitter and the two emitters connected to the inputs of an ... | 05/06/1986 |
| 4558288 | Emitter-follower type SEPP circuit An emitter-follower type SEPP circuit in which, by detecting idle currents and distortion components and feeding such signals back to an error amplifier in a real time mode, a very stable circuit with little crossover distortion is provided. The input sig... | 12/10/1985 |
| 4509020 | Push-pull amplifier For a satisfactory cross-over behavior of the transistors T1 and T2 of push-pull amplifier comprising an input 2 and an output 3, it is necessary that the sum of the base-emitter voltages of the transistors T1 and T2 | 04/02/1985 |
| 4482868 | Output stage for a driver circuit having low quiescent output current An output stage having a small quiescent current is provided. A current source portion provides an output current via an output terminal in proportion to a drive current. A current sink portion sinks output current in proportion to an input control voltag... | 11/13/1984 |
| 4442409 | Push-pull non-complementary transistor amplifier A push-pull amplifier having like conductivity output transistors is driven by a phase-splitter transistor amplifier. The collector load of the phase-splitter includes a diode bridge for establishing the amplifier idling current. One arm of the bridge inc... | 04/10/1984 |
| 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 |
| 4366448 | Power-amplifying circuit A power-amplifying circuit embodying this invention includes a pre-amplifier stage which comprises two emitter-connected transitors, one of whose bases is supplied with an input signal and an output stage comprising complementary pair of a first transisto... | 12/28/1982 |
| 4342966 | Power amplifier circuitry In a single-ended push-pull power amplifier circuit having a first transistor of a first driver stage, a second transistor of a first output stage where the first and second transistors are Darlington connected, a third transistor of a second driver stage... | 08/03/1982 |
| 4336504 | Push-pull output circuit A push-pull output circuit which is capable of producing a relatively-high maximum output voltage without the use of a bootstrap capacitor provides positive and negative half cycle output circuits which are constructed as inverted Darlington output circui... | 06/22/1982 |
| 4316149 | Power amplifier A power amplifier being controlled by a feedback signal which is related to a product of currents each flowing through power transistors in an SEPP configuration. Current detecting transistors are connected in parallel at their base-emitter paths to the b... | 02/16/1982 |
| 4306199 | Push-pull amplifier A push-pull amplifier comprises first and second output circuits each comprising at least one transistor which circuits are mutually connected in push-pull configuration, first and second detection circuits for respectively detecting the differences betwe... | 12/15/1981 |
| 4300103 | Push-pull amplifier A push-pull amplifier, having a first and a second transistor of the same conductivity type, whose collector-emitter paths are included in series between two power-supply terminals, the emitter electrode of the first transistor being connected to the coll... | 11/10/1981 |
| 4266199 | Linear alternating-current amplifier A linear alternating-current amplifier with push-pull-connected first and second output transistors Q1, Q2 includes a pilot transistor Q4 and a control transistor Q3 which drives the first output transistor Q | 05/05/1981 |
| 4217556 | Output amplifying circuit An output amplifying circuit which comprises a Push Pull amplifier section, a power supply circuit section and an amplifier section for amplifying a power source. The circuit eliminates an occurrence of switching distortion and minimizes heat loss therein... | 08/12/1980 |
| 4215318 | Push-pull amplifier A push-pull amplifier having a pair of output transistors and a pair of emitter coupled resistors, one terminal of each resistor coupled to an emitter of a respective transistor and the other terminals being commonly connected to an output point. A compar... | 07/29/1980 |
| 4035737 | Low noise amplifier A low noise amplifier for amplifying a signal from a moving coil phono cartridge which comprises a plurality of pairs of complimentary first and second transistors in push-pull and each pair in parallel, with a resistance of relatively low-value in the em... | 07/12/1977 |
