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| Number | Title | Issue Date |
| 7583148 | Transconductance control circuit, method of controlling transconductance, and a power amplifier A transconductance control circuit, comprising: a test transconductance circuit for providing an output current from a reference voltage; apparatus for deriving a bias current for the test transconductance circuit from the output current, the bias current including ... | 09/01/2009 |
| 7369816 | Highly accurate temperature sensor employing mixed-signal components A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 05/06/2008 |
| 7332969 | Output offset protection for power amplifier A output offset protection circuit provides protection of the load and the power amplifier through monitoring the temperature of the power transistor in the operational amplifier to detect fault conditions of an output block. In the output offset protection circuit,... | 02/19/2008 |
| 7304539 | High frequency power amplifier circuit and electronic component for high frequency power amplifier In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the ... | 12/04/2007 |
| 7250818 | RF power amplifier circuit and RF transmitter and terminal including it A RFPA (radio frequency power amplifier) circuit (150) which includes a RFPA (101), a supply voltage source (104), means (155) for applying to the RFPA a gain control bias voltage and a feedback control loop (156) for adjusting a v... | 07/31/2007 |
| 7248113 | Methods and systems for stabilizing an amplifier The invention generally relates to stabilizing an amplifier. In one aspect, a stabilization module that is in electrical communication with the amplifier is provided. The stabilization module includes both an open loop control system and a closed loop control system... | 07/24/2007 |
| 7157974 | Power amplifier and method for power amplification The invention provides a method for reducing power dissipation in a power amplifier used in wireless communication systems, said power amplifier having transistors showing a quiescent current, wherein the quiescent current of the power amplifier is adaptively change... | 01/02/2007 |
| 7158633 | Method and apparatus for monitoring subscriber loop interface circuitry power dissipation Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a subscriber loop linefeed driver control signal in response to the sensed ... | 01/02/2007 |
| 7135921 | Differential circuit, amplifier circuit, driver circuit and display device using those circuits A differential circuit and an amplifier circuit for reducing an amplitude difference deviation, performing a full-range drive, and consuming less power are disclosed. The circuit includes a first pair of p-type transistors and a second pair of n-type transistors. A ... | 11/14/2006 |
| 7113041 | Operational amplifier An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to a high potential power supply. A second output transistor is connect... | 09/26/2006 |
| 7075366 | Methods and systems for stabilizing an amplifier The invention generally relates to stabilizing an amplifier. In one aspect, a stabilization module that is in electrical communication with the amplifier is provided. The stabilization module includes both an open loop control system and a closed loop control system... | 07/11/2006 |
| 7058375 | Low noise block down-converter having temperature characteristic compensating circuit In a mixer of a converter, a bipolar transistor is connected between the base of a bipolar transistor and a positive power-supply node within a driving circuit, as a temperature characteristic compensating circuit. When the ambient temperature of the driving circuit... | 06/06/2006 |
| 7042290 | Output stage circuit for an operational amplifier An output stage circuit is configured for enabling an output of an amplifier circuit to be pulled upwards and/or downwards to or beyond an upper power supply or below a lower power supply. The exemplary output stage circuit comprises a pair of output transistors con... | 05/09/2006 |
| 6939736 | Ideal operational amplifier layout techniques for reducing package stress and configurations therefor A method of reducing package stress includes placing matched components of an op-amp substantially in a region of a die having the least stress gradients. The region is located in the center of the die. Further, the center is the common centroid of the die. The matc... | 09/06/2005 |
| 6903609 | Operational amplifier An operational amplifier that decreases idling current, widens a voltage output range, and increases load driving capacity. The operational amplifier includes a first output transistor connected to a high potential power supply. A second output transistor is connect... | 06/07/2005 |
| 6693467 | Circuit of substantially constant transconductance What is involved is a transconductance circuit is discussed, having at least one transconductance subcircuit (100) that is connected between two supply terminals (20, 21) and includes at least one MOS transistor (M1, M1'). It comprises means (200) for bia... | 02/17/2004 |
| 6614306 | Bias circuit for class AB high frequency amplifiers A high-speed cascode amplifier includes a cascode input stage. The cascode input stage sinks a cascode current in proportion to an input signal. The cascode current is sourced through two conduction paths. A first conduction path corresponds to the operat... | 09/02/2003 |
| 6459245 | Voltage supply for a sensor unit and acceleration sensor unit with such a voltage supply A voltage supply unit which operates at an internal switching frequency and has a capacitor connected in parallel with its output is connected to the input of a sensor unit operating at an internal switching frequency. The connecting line contains a resis... | 10/01/2002 |
| 6054898 | Semiconductor device having SEPP connected NPN and PNP transistors A semiconductor device capable of maintaining good temperature compensation and reducing manufacture costs of SEPP connecting NPN and PNP power transistors and temperature compensating and biasing circuits. A first semiconductor device has an ordinary bia... | 04/25/2000 |
| 5818301 | Power amplifier arrangenment of a plural power supply switching type A power amplifier arrangement for amplifying audio signals to be applied to a number of speakers has a plurality of power amplifiers. A level detector detects a level of a peak value of outputs from the power amplifiers, and produces a control signal when... | 10/06/1998 |
| 5814953 | Power amplifier predriver stage A power amplifier circuit drives a load with a convergence correction current which is proportional to a convergence correction voltage waveform that is applied to the power amplifier circuit. A predriver stage of the power amplifier circuit comprises fir... | 09/29/1998 |
| 5689211 | Quiescent current control for the output stage of an amplifier The invention is an amplifier such as an operational amplifier having an output stage with a reduced quiescent current control transistor device area that provides sufficient quiescent current control for proper operation thereof. The output stage include... | 11/18/1997 |
| 5627495 | Topography for integrated circuit operational amplifier A high speed integrated circuit operational amplifier chip having first, second, third and fourth successive edges includes a thermal centerline parallel to the second and fourth edges. An output driver circuit is located adjacent to an output bonding pad... | 05/06/1997 |
| 5623232 | Topography for integrated circuit operational amplifier having low impedance input for current feedback A high speed integrated circuit operational amplifier chip first, second, third and fourth successive edges includes a thermal centerline parallel to the second and fourth edges. An output driver circuit is located adjacent to an output bonding pad along ... | 04/22/1997 |
| 5537080 | Gain stability arrangement for HV MOSFET power amplifier A high power radio frequency amplifier employs a power stage in which a bank of push-pull stages are connected in parallel. These power stages employ relatively low-cost high voltage MOSFETs. Because the devices are operated in their active regions, these... | 07/16/1996 |
| 5444419 | Power amplifier having a temperature compensation circuit First and second power transistors collectors of which are connected with each other, other first and second loss sharing transistors connected to bases of the first and second power transistors at collectors thereof, respectively. A first driver transist... | 08/22/1995 |
| 5337012 | Amplifier having temperature compensated bias control An amplifier arrangement which includes a first and a second output transistor each having a base, a collector and an emitter. A bias stage generates a bias voltage between the bases of the first and the second output transistor. The emitters of the first... | 08/09/1994 |
| 5159288 | Receiver circuit having first and second amplifiers A receiver circuit includes a first amplifier for amplifying an input signal and for outputting a first amplified signal, a first bias circuit coupled to the first amplifier for supplying a first bias current to the first amplifier, where the first amplif... | 10/27/1992 |
| 4935704 | Low distortion linear amplifier with high-level output An improved direct-coupled transistor amplifier circuit includes a pair of complementary conductivity type output transistors that are quiescently biased to slightly conductive state to provide low distortion amplification and temperature stabilized opera... | 06/19/1990 |
| 4800339 | Amplifier circuit An amplifier circuit has a voltage-amplifying stage, an output stage including a push-pull circuit comprising at least one complementary pair of output transistors, and a drive stage for driving the output transistors of the output stage in response to th... | 01/24/1989 |
| 4757271 | Composite audio amplifier Audio amplifier comprising symmetrical, dual polarity power supply and class AB audio amplifier circuit, said supply comprising first positive (86) and negative (85) and second positive (83) and negative (84) unregulated DC inputs; positive and negative r... | 07/12/1988 |
| 4728903 | Class A high-fidelity amplifier The disclosed amplifier comprises a MOSFET output stage biased for Class A operation and a bipolar current amplification stage biased for Class C operation. The latter stage is normally cut off, and at low power output levels the entire output signal curr... | 03/01/1988 |
| 4555672 | High-fidelity audio frequency amplifier A high frequency audio amplifier in which the positive and negative bias ports of an operational amplifier are employed to drive two oppositely phased current mirror circuits. Additionally, the outputs of the current mirror circuits are current regulated ... | 11/26/1985 |
| 4523154 | Enhanced-accuracy semiconductor power amplifier A DC amplifier uses complementary npn and pnp output transistors on n-type and p-type substrates, respectively. The output transistors are in an emitter-follower configuration with no emitter resistor to prevent thermal runaway. Instead, emitter-follower ... | 06/11/1985 |
| 4489283 | Power amplifier A power amplifier comprises a power amplifying element for driving a load wherein a forward bias voltage applied between an input terminal and an output terminal of said power amplifying element which varies depending upon an output current of said power ... | 12/18/1984 |
| 4475103 | Integrated-circuit thermocouple signal conditioner An integrated-circuit thermocouple signal conditioner having on a single chip an amplifier and a transistor circuit responsive to the chip temperature for developing a cold-junction compensation signal referred to 0° Celsius. The amplifier includes two m... | 10/02/1984 |
| 4313082 | Positive temperature coefficient current source and applications A circuit for providing a current having a positive temperature coefficient including a first circuit for producing a first current having substantially a constant temperature coefficient (or a negative temperature coefficient) of a first predetermined va... | 01/26/1982 |
| 4302727 | Power amplifier having bias circuit with temperature compensation In a single-ended push-pull power amplifier, a transistor is provided which detects the collector power dissipation of one of complementary power transistors. The power dissipation detecting transistor is thermally coupled with a temperature compensation ... | 11/24/1981 |
| 4274059 | Single ended push-pull amplifier Two closed loops including a base bias controlling circuit are provided in a single ended push-pull amplifier. The base bias controlling circuit controls base bias voltages of respective transistors constituting the final stage of the push-pull operation ... | 06/16/1981 |
| 4243946 | Class-B current source amplifier A highly efficient class-B current source audio amplifier with little heat generation having one amplifier half fixedly biased with the other amplifier half slave biased to the first. Each amplifier half contains a tandem chain of unmatched transistors. T... | 01/06/1981 |
