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| Number | Title | Issue Date |
| 8164389 | Overdrive protection circuit Embodiments of circuits, apparatuses, and systems for an overdrive protection circuit arranged at an input to a primary power transistor to protect against overdrive conditions, where the overdrive protection circuit includes a sensing resistor. Other embodiments ma... | 04/24/2012 |
| 8154346 | Short circuits and power limit protection circuits In one embodiment, a method includes: detecting one of a short-to-ground condition and a short-to-supply condition at an output node; selectively activating a feedback control transistor according to the detecting; detecting a first current passing through a first t... | 04/10/2012 |
| 8154345 | Apparatus and method for current sensing using a wire bond An apparatus for sensing power amplifier current includes a system voltage source that is used to develop a reference voltage, a wire bond structure connected between the system voltage source and a power amplifier, where a sense voltage developed across the wire bo... | 04/10/2012 |
| 8143950 | Power amplifier break down characteristic Disclosed herein is a power amplifier. The power amplifier includes a first common source transistor for amplifying an input signal into a predetermined level, a second common source transistor for compensating for input capacitance and performing auxiliary amplific... | 03/27/2012 |
| 8067986 | Closed loop surge protection technique for differential amplifiers A differential amplifier with surge protection is described. The differential amplifier includes a first output driver device, a second output driver device, a first replica device, a second replica device, a current comparator, and a clamp circuit. The first replic... | 11/29/2011 |
| 8018287 | RF power amplifier apparatus and power supply circuit for controlling power-supply voltage to RF power amplifier The RF power amplifier apparatus has an RF power amplifier and a power-supply circuit. The power-supply circuit controls the level of a source voltage supplied to the RF power amplifier in response to the level of a power-control signal. A sensing resistance produce... | 09/13/2011 |
| 7889011 | Output short circuit and load detection One embodiment of an apparatus for testing an amplifier includes an amplifier having a driver and a filter, the filter being connected between an output of the driver and an output of the amplifier. The filter is operable to produce a demodulated output signal from ... | 02/15/2011 |
| 7876161 | Amplifier circuit having first amplifying section and second amplifying section An amplifier circuit includes a first amplifying section for amplifying a signal, and a second amplifying section for amplifying the signal amplified by the first amplifying section. A capacitive element connects the output of the first amplifying section to the inp... | 01/25/2011 |
| 7859341 | Semiconductor device A current limiting circuit is connected to the gate (input terminal) of an amplifying transistor. The current limiting circuit includes a protecting transistor, a first protecting resistor connecting the drain to the gate of the protecting transistor, and a second p... | 12/28/2010 |
| 7859340 | Metal-oxide-semiconductor circuit designs and methods for operating same Complimentary Metal-Oxide-Semiconductor (CMOS) circuits made with core transistors are capable of reliable operation from an IO power supply with voltage that exceeds the reliability limit of the transistors. In embodiments, biasing of an operational amplifier is ch... | 12/28/2010 |
| 7855604 | Protection circuit and method for RF power amplifiers in WLAN transceivers A transmitter system includes a transmitter with a power amplifier. An antenna communicates with the power amplifier. A protection circuit generates a sensed signal that varies with an impedance of the antenna and reduces an output of the power amplifier in response... | 12/21/2010 |
| 7839218 | RF power amplifier apparatus and power supply circuit for controlling-power supply voltage to RF power amplifier The RF power amplifier apparatus has an RF power amplifier and a power-supply circuit. The power-supply circuit controls the level of a source voltage supplied to the RF power amplifier in response to the level of a power-control signal. A sensing resistance produce... | 11/23/2010 |
| 7825734 | Amplifier having an output protection, in particular operational amplifier for audio application An amplifier with an output protection having an input stage defining a feedback node, an output stage connected to the feedback node and defining an output node supplying an output voltage, and a feedback stage connected between the output and the feedback nodes. A... | 11/02/2010 |
| 7812674 | Common centroid electrostatic discharge protection for integrated circuit devices A method of protecting a circuit design implemented within an integrated circuit (IC) from electrostatic discharge (ESD) can include positioning a device array pair comprising first and second device arrays on the IC to share a common centroid, wherein the first and... | 10/12/2010 |
| 7795980 | Power amplifiers having improved protection against avalanche current A power amplifier for use in a radio frequency (RF) transmitter or other device exhibits improved protection from voltage standing wave ratio (VSWR) issues emanating from avalanche currents. The amplifier circuit includes a power transistor having a base terminal, a... | 09/14/2010 |
| 7760027 | Power amplifier output voltage reduction method An apparatus and method are provided for reducing the output voltage in a power amplifier. The power amplifier contains a power supply, an amplifier stage, an impedance matching circuit, and a voltage reduction unit connected between the power supply and the amplifi... | 07/20/2010 |
| 7755432 | Short circuit protection circuits and methods In one embodiment the present invention includes a circuit comprising an amplifier, a first monitor circuit, a second monitor circuit, a third monitor circuit, and a control circuit. The amplifier comprises a first transistor and a second transistor driven by first ... | 07/13/2010 |
| 7741915 | Power amplification apparatus in communication system Disclosed is a power amplification apparatus in a communication system. The apparatus includes a high power amplifier for amplifying an input signal; and a lattice panel, one surface of which is in contact with a ground plane of the high power amplifier, the one sur... | 06/22/2010 |
| 7719363 | Method and apparatus for output amplifier protection An amplifier circuit includes a first circuit and a second circuit connected in series. The first circuit has a first terminal coupled to a first power supply terminal, a second terminal coupled to an output node, and a control terminal for receiving a first signal ... | 05/18/2010 |
| 7710204 | Adaptive protection circuit for a power amplifier A radio frequency device comprises a radio frequency (RF) power amplifier (PA) operably coupled to a protection circuit for minimising voltage standing wave ratio effects, wherein the protection circuit comprises a current limiter indexed to a power supplied to the ... | 05/04/2010 |
| 7701295 | High-efficiency class-AB amplifier A high efficiency class-AB amplifier is disclosed. The amplifier comprises a first input stage and a second input stage, both coupled to a class-AB biasing mesh and an output stage, wherein the outputs of the first and second input stages are directly coupled to the... | 04/20/2010 |
| 7701296 | Semiconductor device A current limiting circuit is connected to the gate (input terminal) of an amplifying transistor. The current limiting circuit includes a protecting transistor, a first protecting resistor connecting the drain to the gate of the protecting transistor, and a second p... | 04/20/2010 |
| 7696827 | Power amplifier system provided with improved protection function A power amplifier system including a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal to which a control signal is supplied from outside, a power amplifier circuit connected between the power terminal and the ground termin... | 04/13/2010 |
| 7692491 | Radio-frequency power amplifier A radio-frequency power amplifier for preventing a final-stage HBT from being destroyed is provided. To this end, a radio-frequency multistage power amplifier of the present invention includes: a first amplification stage having a first hetero bipolar transistor of ... | 04/06/2010 |
| 7692492 | Operational amplifier An operational amplifier includes a differential amplifier circuit provided at an input stage and an amplifier circuit at a post stage. In the differential amplifier circuit, first and third bipolar transistors are PNP-type bipolar transistors and Darlington-connect... | 04/06/2010 |
| 7642856 | Amplifier capable of using a power supply voltage higher than its process voltages An amplifier can advantageously use a power supply voltage source that provides a voltage greater than all breakdown voltages of the process associated with transistors of the amplifier. Specifically, cascoded configurations can be used to reduce the gate-drain and ... | 01/05/2010 |
| 7642857 | Current limit circuit for compensating for output load mismatch of an RF power amplifier An apparatus and method is disclosed for providing control of current consumption of a power amplifier. The power amplifier comprises an output stage for amplifying a RF signal, and the output stage is operably coupled to an output load. The power amplifier further ... | 01/05/2010 |
| 7619481 | Circuit for inhibiting over-current in power amplifier A power amplifier drives a load connected to a first output terminal and a second output terminal. When generation of over-current is detected by the current detection section, the output amplifier control section is controlled to stop the operation of the output am... | 11/17/2009 |
| 7595696 | Power amplifier A power amplifier including an active device having at least one heterjunction bipolar transistor based on a compound semiconductor; a diode connected between the base and the emitter of the bipolar transistor in reverse direction with respect to the base-emitter di... | 09/29/2009 |
| 7570118 | Thermal overload protection circuit and method for protecting switching power amplifier circuits A thermal overload protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive load when the amplifier output is disabled in response to a thermal ov... | 08/04/2009 |
| 7557660 | Power amplification device A power amplification device includes a BTL amplification circuit including a first amplification circuit and a second amplification circuit, the first amplification circuit including a first output transistor, a first power detection circuit, a second output transi... | 07/07/2009 |
| 7554409 | Over-current protection circuit and method for protecting switching power amplifier circuits An over-current protection circuit protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive load when one or more transistors in the amplifier out... | 06/30/2009 |
| 7551034 | Saturation handling Saturation handling for preventing a power amplifier from going into a saturation condition is disclosed. ... | 06/23/2009 |
| 7535305 | Quiescent current detecting circuit for class AB amplifier An operational transconductance amplifier is configured with an asymmetric output current capability. When current sunk from the output exceeds a rated load, the normally equal input voltages diverge. A comparator coupled to the OTA inputs senses when the output cur... | 05/19/2009 |
| 7532076 | Operational amplifier An operational amplifier includes a differential amplifier circuit provided at an input stage and an amplifier circuit at a post stage. In the differential amplifier circuit, first and third bipolar transistors are PNP-type bipolar transistors and Darlington-connect... | 05/12/2009 |
| 7525389 | Signal amplifier circuit with a limiting voltage device A signal amplifier circuit includes a negative feedback amplifier circuit having an output terminal, a first voltage limiting device for limiting the output voltage from the negative feedback amplifier circuit, a second voltage limiting device for limiting the outpu... | 04/28/2009 |
| 7489199 | Saturation detector and warning circuit including clamp A saturation detection and warning circuit having an adaptive threshold voltage is disclosed. The disclosed circuit can also be used to detect the impending drop out of the low drop out linear voltage regulator. A clamp circuit that clamps the amplifier's output vol... | 02/10/2009 |
| 7486144 | RF power amplifier protection A circuit and method for protecting a radio frequency power amplifier against peak drain voltage. A detector circuit has an input connected to a drain of a power transistor of an amplification stage of the power amplifier to detect a peak drain voltage therefrom. Th... | 02/03/2009 |
| 7482877 | Power protecting apparatus and method for power amplifier A power protecting apparatus and method of a power amplifier for removing backward voltages and preventing a hard damage within a circuit by connecting an output terminal of a DC-DC converter with an input terminal of a filter using diodes when an excessive backward... | 01/27/2009 |
| 7482878 | Radio frequency power amplifier circuit A radio frequency power amplifier, having a first amplifying transistor 103-1 and a second amplifying transistor 103-2, comprises a detection circuit 101 that detects an output power and outputs a voltage according to the output po... | 01/27/2009 |
