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| Number | Title | Issue Date |
| 8054129 | Class D amplifier A class D amplifier includes: an amplifier that generates a digital signal for driving a load based on an input signal; an attenuator that attenuates the input signal according to an attenuation command signal; and a clip prevention controller that outputs the atten... | 11/08/2011 |
| 8022763 | Amplifier failure detection apparatus An amplifier failure detection apparatus for a radio transmitter that has a function for compensating for amplifier distortion of the radio transmitter and a function for determining amplifier failure has occurred by detecting that the gain of an amplifier has dropp... | 09/20/2011 |
| 7982535 | AMP output protective circuit for LCD panel source driver An AMP output protective circuit for an LCD panel source driver is disclosed. To solve a problem that internal diodes of PMOS/NMOS of an AMP output circuit are turned on, embodiments are characterized in making input and output voltages of the AMP in a charge sharin... | 07/19/2011 |
| 7924090 | Amplifying device An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided. An ECM is connected to an input terminal 21 and frequency characteristics become flat to a voice band by h... | 04/12/2011 |
| 7705673 | Over-current sensing during narrow gate drive operation of class D output stages Two transistors of a class D output stage are driven by complementary, variable duty cycle signals PWM+ and PWM−. When the pulse width of the PWM+ signal becomes too narrow for reliable operation of prior art over-current protection circuits sensing the drain to s... | 04/27/2010 |
| 7626456 | Overdrive control system An overdrive control system includes a voltage controlled current source to deliver a compensation current, and being between a first voltage reference and an internal node, which is connected to an output terminal. The voltage controlled current source has a contro... | 12/01/2009 |
| 7482870 | Class D amplifier A class D amplifier includes: an amplifier that generates a digital signal for driving a load based on an input signal; an attenuator that attenuates the input signal according to an attenuation command signal; and a clip prevention controller that outputs the atten... | 01/27/2009 |
| 7394312 | Re-configurable amplifier protection apparatus and method The present invention is directed to an amplifier, which is able to re-configure its internal protection circuits based on an output signal level. This allows the amplifier to apply the best protection level to the present operational condition. The protection level... | 07/01/2008 |
| 7391267 | Output circuit A patterning area of an output circuit is reduced while securing strong enough ESD tolerance. In the output circuit of this invention, an output of a first amplifier and an output of a second amplifier are connected to a common output pad. Each of the amplifiers is ... | 06/24/2008 |
| 7375589 | Power amplifier system provided with improved protection function The present invention provides a power amplifier system that includes a power terminal, a ground terminal, an output terminal, a ripple terminal, a control terminal, a power amplifier circuit connected between the power terminal and the ground terminal, a negative p... | 05/20/2008 |
| 7362871 | Audio amplifier circuit and audio IC having the same In the present invention, in parallel with a resistor which determines an amplification rate being fed back from an output to an input of an output stage OP amp in an audio amplifier circuit, providing a first diodes connected bi-directionally together with a first ... | 04/22/2008 |
| 7358807 | Protection of output stage transistor of an RF power amplifier A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanen... | 04/15/2008 |
| 7352240 | Method and apparatus for protecting devices in an RF power amplifier A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a peak voltage that exceeds a threshold voltage. In response to the detect... | 04/01/2008 |
| 7349679 | Integrated power amplifier A power amplifier develops a modulated high power signal by summing the outputs of multiple voltage controlled oscillators. A phase control circuit synchronizes the phase relationship of multiple voltage controlled oscillators. The voltage control oscillators provid... | 03/25/2008 |
| 7339424 | Apparatus and method for controlling temperature of electronic apparatus In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downwar... | 03/04/2008 |
| 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 |
| 7330072 | Circuit for power amplification A radio frequency (RF) power amplifier, including an external control loop and a protection circuit, which functions to maintain a constant output power during variations in impedance on the RF load. In the external control loop a collector current from an output tr... | 02/12/2008 |
| 7327187 | Method, circuit and power amplifier for detecting a fault, and method of protecting a circuit in a power amplifier from a fault occurrence In a method of detecting a fault in a class D amplifier, an amplifier output signal is generated based on inverting a pulse width modulation signal corresponding to received audio data. The amplifier output signal is low pass filtered and hysteretically filtered (Sc... | 02/05/2008 |
| 7315461 | Power supply device An object of this power supply device is to enable an overheat protection level and an overvoltage protection level to be set accurately. This power supply device includes a Schottky barrier diode (D52), which is placed as a temperature detection element at a... | 01/01/2008 |
| 7298852 | Dynamic power sharing in a multi-channel sound system A signal processing system for use in a multichannel audio system. The signal processing system includes a first channel having a first audio signal. A second channel is included that has at least a second audio signal. A processor is included that is responsive to ... | 11/20/2007 |
| 7282997 | Thermal coupling device A micro-electronic power amplifier that defines a uniform thermal impedance includes an output stage including a single transistor array including a plurality of emitter leads and a single thermal coupling device that thermally couples together each of the emitter l... | 10/16/2007 |
| 7276974 | Method and apparatus for protecting RF power amplifiers Method and apparatus are provided for protecting radio frequency (RF) power amplifiers. A circuit (10) is provided for limiting a supply current to a first stage (Q3) of the RF power amplifier having a second stage (Q2) coupled to the first stag... | 10/02/2007 |
| 7268621 | Digital amplifier A threshold value adjustment circuit for adjusting a predetermined threshold value is provided in a stage followed by a protection circuit which starts protection operation when a load current flowing into an MOSFET exceeds the threshold value. A voltage proportiona... | 09/11/2007 |
| 7262667 | Radio frequency power amplifier A radio frequency (RF) power amplification circuit including a power amplifier is provided for preventing breakdown of the power amplifier. The power amplifier includes an input for receiving RF signals and an output for providing amplified RF signals. The RF power ... | 08/28/2007 |
| 7259618 | Systems and methods for load detection and correction in a digital amplifier Systems and methods for detecting the impedance of an output load coupled to a digital amplifier and compensating for changes in the response of the amplifier. One embodiment of the invention is implemented in a Class D pulse width modulated (PWM) amplifier. In this... | 08/21/2007 |
| 7233199 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/19/2007 |
| 7205843 | Protection circuit for power amplifier A directional coupler is provided on the output side of a power amplifier. An increase in reflected wave power from a load is detected through the directional coupler by an electric power detector (wave detector). Then, a detection signal of an electric power detect... | 04/17/2007 |
| 7205840 | Wideband CMOS gain stage A CMOS gain stage includes biasing circuitry configured to insure saturation of a subsequent stage without a source follower circuit. The CMOS gain stage is optionally powered by a supply voltage that is greater than a permitted supply voltage for a processes techno... | 04/17/2007 |
| 7205834 | Power amplifier In a power amplifier driven by a pulse width modulation (PWM) signal, a first pair of drive pulses opposite in level to each other is formed from a first pulse width modulation signal whose quantization level corresponds to its pulse width and supplied to a first pu... | 04/17/2007 |
| 7193476 | Integrated circuit An integrated circuit includes a high-frequency power amplifier and a matching circuit. The high-frequency power amplifier has at least one stage of an amplifier element. The matching circuit has a MOSFET and a detector diode. The source of the MOSFET is connected t... | 03/20/2007 |
| 7190935 | Amplifier power detection circuitry The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input... | 03/13/2007 |
| 7164315 | Power detector for mismatched load A method for measuring the forward power output of an amplifier with improved accuracy with a mismatched load based on probing the amplitude of the AC voltage and current in the final amplifier stage. Amplitudes are combined resulting in a composite reading that is ... | 01/16/2007 |
| 7148748 | Active protection circuit for load mismatched power amplifier A peak detector detects an amplifier output overvoltage condition if the amplifier drives a mismatched load impedance. In response to the detected overvoltage condition, a clamping transistor lowers a reference DC bias voltage supplied by a bias circuit to the ampli... | 12/12/2006 |
| 7145397 | Output overvoltage protection circuit for power amplifier Disclosed is an output overvoltage protection circuit for a power amplifier having a plurality of stages, which comprises a monitor circuit for monitoring an output overvoltage of an output transistor in the final stage of the power amplifier and allowing a current ... | 12/05/2006 |
| 7145396 | Method and apparatus for protecting devices in an RF power amplifier A method and apparatus are provided for use with a power amplifier for protecting active devices on the power amplifier. A peak detector is used by control circuitry to detect the presence of a peak voltage that exceeds a threshold voltage. In response to the detect... | 12/05/2006 |
| 7138864 | Overcurrent protection in amplifier topologies employing DC isolation An amplifier having output switch circuitry is described. A sense resistor is operable to transmit an output current associated with the output switch circuitry. Low-voltage circuitry is operable to provide a drive signal to the output switch circuitry. Isolation ci... | 11/21/2006 |
| 7102445 | Power amplifier module An amplifier 2c amplifies a transmit signal and outputs the amplified transmit signal to an antenna 10. A drive current for driving the amplifier 2c is inputted to a drive current input terminal 7. A current divider circuit ... | 09/05/2006 |
| 7095988 | Apparatus for linear transmitter with improved loop gain stabilization A device for linear transmitter (150) with improved loop gain stabilization. The linear transmitter (150) includes a main amplifier loop (178) and an auxiliary loop (176). The device includes an adjustable device (159), connected w... | 08/22/2006 |
| 7092533 | BTL amplifier apparatus A BTL amplifying apparatus has two power amplifiers in an BTL configuration for amplifying a speaker. It includes detection means for detecting a differential voltage between outputs from the two power amplifiers while an input signal to be supplied to the power amp... | 08/15/2006 |
| 7088967 | Data-compensating power measurement A method and a device for compensating a data-dependency of a power measurement caused by linear modulation is described. The method comprises performing a first measurement (160) of a transmitted output power and performing a second measurement (160) ... | 08/08/2006 |
