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| Number | Title | Issue Date |
| 7786804 | Driving amplifier circuit with digital control and DC offset equalization A driving amplifier circuit includes: a first driver for sourcing a load current to a load; a second driver for sinking the load current from the load; a first operational amplifier (op-amp) for driving the first driver; a second operational amplifier for driving th... | 08/31/2010 |
| 7629849 | Driving amplifier circuit with digital control A driving amplifier circuit includes: a first driver for souring a load current to a load; a second driver for sinking the load current from the load; a first operational amplifier (op-amp) coupled to a differential input signal for driving the first driver; a secon... | 12/08/2009 |
| 7382174 | A-AB transconductor A transconductor including circuitry for automatically selecting a non-linear class A operation or a linear class AB operation based on an input signal to be processed to generate an output signal, and for automatically adjusting current from a power supply to a lev... | 06/03/2008 |
| 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 |
| 7145393 | Operational amplifier with class-AB+B output stage An operational amplifier is provided that includes a Class-AB stage and a Class-B stage coupled in parallel with each other to form an output stage. The Class-AB stage is operable to drive an output load. The Class-B stage is also operable to drive the output load a... | 12/05/2006 |
| 7093054 | Method of transferring signals between a TTL microcontroller and a RS232 device A switching transistor is placed between a serial port of a RS232 device and a parallel port of a TTL microcontroller. Selective activation of the switching transistor permits a high voltage signal to be transmitted from the power supply rail of the TTL microcontrol... | 08/15/2006 |
| 7061740 | System and method for protecting an audio amplifier output stage power transistor A system and method for protecting an output transistor in an audio amplifier output stage includes a protection circuit that protects the output transistor from excessive currents and voltages, and does not interfere with the normal operation of the output transist... | 06/13/2006 |
| 6975172 | Smart voltage rail reduction audio amplifier An audio amplifier is provided that adjusts the supply voltage rails communicated to a power amplifier circuit according to the circuit's output. The amplifier compares the output voltage from the power amplifier to a predetermined voltage range to determine if the ... | 12/13/2005 |
| 6903610 | Operational amplifying circuit and push-pull circuit In an operational amplifying circuit, the first transistor is configured to turn on and off according to an output signal outputted from the operational amplifier through the output terminal thereof. The second transistor is connected to the first transistor in seri... | 06/07/2005 |
| 6794943 | Ultra linear high speed operational amplifier output stage The present invention provides an ultra linear, high speed operational amplifier output stage (100). The advantages of the operational amplifier output stage disclosed is significantly higher linearity for the same supply current, or equivalent linearity usin... | 09/21/2004 |
| 6784738 | Method and apparatus for gain control in a CMOS low noise amplifier An amplifier comprising a Low Noise Amplifier (LNA) to amplify a Radio Frequency (RF) signal. The LNA having a transconductance and including an input stage to receive the RF signal. The LNA again varying as a function of changes in conditions. A bias assembly to ge... | 08/31/2004 |
| 6636117 | Input/output buffer incorporating filter for powerline communications line An improvement in a buffer for driving a signal onto a power line is described. The buffer includes a second order filter. With the improvement, the collector-to-emitter potential of an emitter follower is maintained constant to substantially reduce the d... | 10/21/2003 |
| 6535064 | Current-feedback amplifier exhibiting reduced distortion The disclosure describes a current feedback amplifier that contains an additional pair of emitter follower transistors connected between inputs of current mirrors, with a capacitor connected to the common emitters of the emitter follower transistors to re... | 03/18/2003 |
| 6535063 | Drive method for a cross-connected class AB output stage with shared base current in pre-driver The present invention provides technical advantages as a class AB output driver (400) with minimal cross-over distortion. If the differential input to the driver is I+δI/2 and I-δI/2, then the current gain is the average of ଲn and ... | 03/18/2003 |
| 6529078 | Low-distortion transimpedance amplifier structures and methods Transimpedance amplifiers are provided that generate low-distortion output voltage signals with simple, inexpensive structures that are compatible with integrated-circuit fabrication processes. The amplifiers include a current processor and a complementar... | 03/04/2003 |
| 6501334 | Actively biased class AB output stage with low quiescent power, high output current drive and wide output voltage swing A class `AB` amplifier output stage has an active current bias source that provides base drive current to the output transistors that is proportional to the signal input voltage level. The output transistor currents are modulated with the input signal suc... | 12/31/2002 |
| 6452451 | Method for adjusting a bipolar output stage for improved frequency response A method for adjusting the output response of a complementary bipolar operational amplifier includes: providing a first bipolar transistor 14; providing a second bipolar transistor 16 coupled to the first bipolar transistor 14; providing a first current s... | 09/17/2002 |
| 6429744 | Method for bias rail buffering A bias rail buffer circuit and method in accordance with the present invention overcomes many shortcomings of the prior art. A bias rail buffer circuit for providing a reference signal is suitably configured to absorb external disturbances appearing on an... | 08/06/2002 |
| 6411145 | Feedback control of clock duty cycle A circuit configured to correct a duty cycle error or vary the duty cycle of a clock signal. The circuit includes a differential amplifier or control circuit that receives differential signal inputs. At least one differential pair of transistors is connec... | 06/25/2002 |
| 6384684 | Amplifier A class AB amplifier having an output stage comprising complementary common source transistors (T1, T2) has means for setting the quiescent current. These comprise a bias resistor (R1) through which a bias current is passed and which is connected between ... | 05/07/2002 |
| 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 |
| 6353363 | Low voltage rail-to-rail CMOS output stage An output stage suitable for low voltage operation and capable of providing an essentially symmetrical rail-to-rail output voltage is disclosed. The output stage includes a first field effect device having a first drain, a first gate, and a first source c... | 03/05/2002 |
| 6297699 | Bias rail buffer circuit and method A bias rail buffer circuit and method in accordance with the present invention overcomes many shortcomings of the prior art. A bias rail buffer circuit for providing a reference signal is suitably configured to absorb external disturbances appearing on an... | 10/02/2001 |
| 6294958 | Apparatus and method for a class AB output stage having a stable quiescent current and improved cross over behavior An electronic circuit for a Class AB output stage that has a differential input and a single ended output. A pair of clamp transistors are coupled between the bases of a pair of output transistors so that cross-over distortion is reduced and the output tr... | 09/25/2001 |
| 6262633 | High output current operational amplifier output stage A rail-to-rail op amp output stage is configured to provide one or more additional base drive paths for each of its output transistors, reducing the stage's distortion and increasing its maximum output current without substantially increasing quiescent cu... | 07/17/2001 |
| 6184750 | Control circuit driven by a differential input voltage and method for controlling same The present invention teaches a variety of output stages for amplifying high speed signals while keeping distortion low and using a low supply voltage. The invention includes the use of dual complementary signal paths that include a complementary push-pul... | 02/06/2001 |
| 6175277 | Bias network for CMOS power devices An improved bias network for reducing cross-over distortion in a device having complementary p-MOS and n-MOS power transistors includes complementary helper transistors coupled to power transistors for discharging currents while the power transistors are ... | 01/16/2001 |
| 6100763 | Circuit for RF buffer and method of operation An RF buffer (10) supplies a single ended output signal and differential output signals. An average voltage of the differential output signals is compared to a reference voltage (VR) by an amplifier (40). The amplifier (40) provides a feedback signal for ... | 08/08/2000 |
| 6078220 | Complementary class AB current amplifier A complementary class AB current mirror circuit with a constant current gain which, when driven by a transconductance amplifier, provides a constant overall voltage gain over a wide range of output current. Such current mirror circuit includes cross-coupl... | 06/20/2000 |
| 5973563 | High power output stage with temperature stable precisely controlled quiescent current and inherent short circuit protection An output stage driver circuit comprising two parallel class AB stages running at slightly different quiescent currents, the difference of which is scaled up through a current mirror is disclosed which provides a temperature stable precisely controlled qu... | 10/26/1999 |
| 5963065 | Low offset push-pull amplifier A low offset amplifier has an output stage constituted by an npn transistor and a pnp transistor in a push-pull arrangement, and a driver stage. The latter includes a current-mirror circuit having, in its input branch, a pnp transistor in series with a fi... | 10/05/1999 |
| 5955924 | Differential metal-oxide semiconductor (CMOS) push-pull buffer A differential cMOS push-pull buffer includes a pair of push-pull sections, a cMOS current source transistor connected to the push-pull sections for providing current thereto, and two cMOS trickle current transistors, each connected to an output node of a... | 09/21/1999 |
| 5955923 | Amplifier with reduced cross-over distortion An amplifier arrangement having a first and a second output transistor, which are drain-connected to the output terminal. A driver stage (100), prevents the output transistors from becoming non-conductive, thereby reducing cross-over distortion. This is a... | 09/21/1999 |
| 5892399 | Current boost circuit for reducing crossover distortion in an operational amplifier A current boost circuit includes: a first transistor M10 having a gate coupled to an input node; a second transistor M11 ; a first capacitance CC3 coupled between a gate of the second transistor M11 and a drain ... | 04/06/1999 |
| 5869989 | Amplifying electronic circuit with stable idling current The semiconductor types of first and second semiconductor type transistors are different from one another and the two transistors are connected in series. An input signal is supplied to each of the bases of the first and second transistors. Each of the co... | 02/09/1999 |
| 5754078 | Operational amplifier for class B amplification A first current mirror circuit 6 inversion amplifies the output voltage of an operational amplifier 10 with high potential power supply potential VDD to a voltage with a ground potential as a reference, thus driving a p-MOS transistor QP3 | 05/19/1998 |
| 5673000 | Dynamically invariant AB linear operation amplifier An amplifier providing the linear output of a Class A amplifier and the expanded peak current output and efficiency of a Class AB amplifier. The amplifier includes an input amplifier, a voltage regulator network, a cascode stage, and an output amplifier. ... | 09/30/1997 |
| 5513389 | Push pull buffer with noise cancelling symmetry A buffer (200) having output devices (101 and 102) exhibiting complementary symmetry and configured as voltage-followers in push pull is biased for class AB operation by a bias network including two substantially equal resistors (201 and 202) arranged and... | 04/30/1996 |
| 5452208 | Display device A device for optically providing information pertaining to the value of the quotient of the rates of revolution of two axles contains converters connected to the axles, which converters generate electrical signals which are a measure for the rate of revol... | 09/19/1995 |
| 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 |
