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| Number | Title | Issue Date |
| 7058360 | Method and system for stabilizing the performance variation of a radio frequency device A method for stabilizing the performance variation of a primary radio frequency (RF) device is provided that includes providing a secondary RF device. An output signal is generated with the secondary RF device. The output signal is provided to a feedback circuit. A ... | 06/06/2006 |
| 6975848 | Method and apparatus for DC offset removal in a radio frequency communication channel A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differ... | 12/13/2005 |
| 6630866 | High beta output stage for high speed operational amplifier The present invention provides an high beta, high speed operational amplifier output stage (100). The advantages of the operational amplifier output stage over conventional methods disclosed is up to 댢 rather than a single beta. The pres... | 10/07/2003 |
| 6600371 | Low noise amplifier It is shown a low noise amplifier comprising a first circuit block suitable for converting a first amplifier input voltage signal into current, a second circuit block adapted to divide the current coming from said first block, said second block being cont... | 07/29/2003 |
| 6525602 | Input stage for a buffer with negative feed-back An amplifier stage for a buffer with negative feedback includes an input stage having an input terminal, an output terminal, a first and a second supply terminal, a biasing branch, a first and a second balancing branch each comprising an active transistor... | 02/25/2003 |
| 6127888 | Power amplification device There is disclosed a power amplification device for BTL-driving a load with a half-wave signal whose output direct current level is set close to an earth level, in which output signals of first and second output amplifiers (2) and (3) are added in an adde... | 10/03/2000 |
| 6111464 | Amplifier having bias circuit self-compensating for VGS process variation and IDS aging An LDMOS RF amplifier having a bias voltage generated through feedback around an LDMOS sense transistor has a sense transistor, a current sensing circuit that monitors current in the sense transistor, and a bias voltage generation circuit controlled by an... | 08/29/2000 |
| 5977829 | Low distortion current feedback amplifier with dynamic biasing A low distortion amplifier and method of reducing distortion in an amplifier at high output power in which energy dissipated while the amplifier is operating at low output power, is reduced. A bias circuit provides a quiescent bias current to the input st... | 11/02/1999 |
| 5825246 | Low voltage class AB amplifier The amplifier (200) includes an input stage (220) coupled to two output transistors (281, 282) having a common terminal at the output terminal (206) of the amplifier. Class AB operation of the output transistors (281, 282) is possible at a comparatively l... | 10/20/1998 |
| 5825247 | Electric power amplifier and method for its operation An improved power amplifier having complimentary power transistors connected in push-pull arrangement, and having a bias voltage source coupled to the transistors for generating a transverse idling current flowing through the complimentary pair of transis... | 10/20/1998 |
| 5537081 | No turn-on pop noise amplifier An audio amplifier with no turn-on pop noise is achieved by the following features: (i) an input stage which operates under zero common-mode input voltage, (ii) an output stage which provides the low voltage end of its voltage swing very close to ground v... | 07/16/1996 |
| 5495214 | Method and apparatus for controlling the operating point of an amplifier stage At high frequencies, a video amplifier draws a higher current and normally is biased to provide such current. However, since high frequencies are rarely encountered, the present circuit controls the operating point as a function of the frequency. More spe... | 02/27/1996 |
| 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 |
| 5229721 | Micropower amplifier/transducer driver with signal expansion An amplifier which combines the low quiescent current requirements of a Class B transistor amplifier with the minimal distortion qualities of a Class AB amplifier. In one disclosed embodiment the amplifier is utilized as a receiver amplifier and as a tran... | 07/20/1993 |
| 5202646 | Output stage for amplifiers An output stage for an amplifier includes first and second load current-carrying n-p-n output transistors disposed in different respective amplifier branches having different amplification properties. Negative feedback and limiting circuitry provides a ne... | 04/13/1993 |
| 5175749 | Apparatus and method for DC offset correction in a receiver An apparatus automatically corrects for DC offset in a multi-level packet-switched receiver. A reference carrier frequency is used during the receiver's idle mode to establish a DC offset exiting a discriminator (302). The DC offset is amplified by a vide... | 12/29/1992 |
| 5162752 | Working point adjusting circuit for a single power amplifier having multiple output channels An improved working point adjusting circuit for a single power amplifier having multiple output circuits. When this simple circuit is connected to a Class B transistor power amplifier to support two or more output channels or speakers, it adjusts the work... | 11/10/1992 |
| 5087890 | Amplifier circuit An amplifier circuit includes a negative feedback connected amplifier and a series circuit comprising a capacitor, one end of which is connected to an output terminal of the amplifier, and a resistor, one end of which is connectable to a reference potenti... | 02/11/1992 |
| 5070308 | Working point adjusting circuit for a power amplifier A working point adjusting circuit for a power amplifier. When this simple circuit is connected into a Class B transistor power amplifier it adjusts the working point of the transistors in the output circuit of the power amplifier to the linear portion of ... | 12/03/1991 |
| 4922208 | Output stage for an operational amplifier In an output stage of an operational amplifier comprising first and second NPN output transistors a circuit is coupled between the positive supply conductor and the collector of the first NPN transistor for providing a boosted base current drive thereto a... | 05/01/1990 |
| 4918400 | Amplifier circuit An amplifier circuit comprising an input amplifier stage, a push-pull output stage, a bias stage having the same construction as the input amplifier stage, a first resistor to be given a current flowing through the bias stage, second and third resistors c... | 04/17/1990 |
| 4888502 | Variable bandwidth filter A variable bandwidth filter comprises a transistor long-tailed pair. One of the transistors of the pair has a field effect transistor which is connected in the collector circuit of the transistor and which is used as a variable collector load resistor. Th... | 12/19/1989 |
| 4833423 | Apparatus and method for a wide-band direct-coupled transistor amplifier In a wide-band direct-coupled transistor amplifier, the current through the power output stage must be stabilized to prevent fluctuations in the amplifier output signal. To stabilize the output stage current, a negative feedback loop is established provid... | 05/23/1989 |
| 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 |
| 4531100 | Amplifier suitable for low supply voltage operation An amplifier which is particularly suitable for low supply voltage operation and which is relatively insensitive to power supply voltage variations includes a signal amplifying stage (11) and a control stage (10). The signal amplifying stage (11) includes... | 07/23/1985 |
| 4521740 | Bias current compensated amplifier An amplifier output circuit in which crossover distortion is largely eliminated, temperature compensation of idle current is obviated, and the idle current is maintained stable, independent of the magnitude of the input signal. In one embodiment in which ... | 06/04/1985 |
| 4499431 | Driver circuit configuration for the output stage of electronic power amplifiers An apparatus for improving the salient properties of the output stages of electronic power amplifiers v.s. varying load conditions. A novel circuit, based on current feedback sensing the instantaneous drive current of the output devices, is used to linear... | 02/12/1985 |
| 4491804 | Bias circuit which is independent of output device voltage characteristics for biasing an amplifier in class AB operation A Class AB amplifier circuit includes bias circuitry for biasing the output transistor into partial conduction independent of the base-to-emitter voltage of the transistor. The bias circuitry is a simple circuit loop including the output transistor and fo... | 01/01/1985 |
| 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 |
| 4370623 | Push-pull amplifier circuit An amplifier arrangement is provided which comprises first and second biasing power supply circuits, a push-pull amplifier comprising a pair of transistors, a DC amplifier having a non-inverting input terminal connected to a junction point at which one ha... | 01/25/1983 |
| 4356452 | Class A push-pull amplifier with bias controlling circuit A class A complementary push-pull amplifier comprising first amplification means and second amplification means complementary in type to the first amplification means; first and second current detection means for detecting each output current of the first... | 10/26/1982 |
| 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 |
| 4283683 | Audio bridge circuit A circuit responsive to applied audio signals for amplifying the same and providing the amplified signals across differential output terminals. The circuit comprising an audio amplifying section which is responsive to the audio input signals for amplifyin... | 08/11/1981 |
| 4237425 | Automatic bias adjusting circuit A bias adjusting circuit for a push-pull amplifier is disclosed, which automatically increases or decreases the bias in the amplifier circuit so that the desired bias level is maintained. The bias adjusting circuit measures the current consumption of both... | 12/02/1980 |
| 4220930 | Quasi-linear amplifier with feedback-controlled idling currents A quasi-linear amplifier, wherein each of first and second current dividers maintains a constant ratio between drive currents to respective output transistor means and dummy output transistor means, uses regulation of the quiescent drive currents to the d... | 09/02/1980 |
| 4095128 | Push-pull switching circuit with minority carrier storage delay A push-pull switching circuit including two grounded emitter transistors 5, 6 controlled by a pair of AND gates 3, 4. The collector output of each transistor is fed back to an input of the AND gate controlling the other transistor, the remaining AND gate ... | 06/13/1978 |
| 4090139 | Complementary symmetry FET mixer circuits Series-connected, field-effect transistors (FET's) of complementary conductivity types are employed to mix two or more input signals. The transistors are quiescently biased in their linear operating range. Each input signal is applied to the gate electrod... | 05/16/1978 |
| 4028630 | Push-pull amplifier arrangement A push-pull B-stage in IC is arranged with an additional transistor in such a manner that one transistor in the IC and the additional transistor together constitute a new push-pull amplifier while the transistor in the IC is loaded to a higher extent and ... | 06/07/1977 |
