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5049653 |
Wideband buffer amplifier with high slew rate
A wideband buffer is described which has improved slew rate over prior buffers. In one embodiment the buffer includes (a) complementary buffer subcircuit, (b) first and second current mirrors to...
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5014017 |
Power-saving low-frequency power amplifier
A power saving low frequency power amplifier includes a first stage amplifier for receiving and amplifying data signal, a second stage amplifier for amplifying the output of the first stage...
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4991916 |
Method and apparatus for automatically biasing a push-pull amplifier
Method and apparatus are disclosed for automatically biasing a push-pull amplifier. Generally, the auto-biasing circuit of the present invention includes a resistor circuit for sensing the supply...
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4990863 |
Amplifier output stage
An amplifier output stage with minimum circuitry and optimum performance for providing a SAT-to-SAT output voltage signal at an output terminal. The amplifier output stage includes a first...
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4983927 |
Integrated audio amplifier with combined regulation of the "mute" and "standby" functions and the switching transients
An integrated audio amplifier with combined regulation of the "mute" and "standby" functions and the switching transients, is configured so that the "mute" and "standby" states are compulsory...
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4935703 |
Low bias, high slew rate operational amplifier
A bias current source for the output stage of an operational amplifier is controllable. The bias current generator senses the voltage differential on the differential operational amplifier inputs....
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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...
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4897616 |
Wide band amplifier with current mirror feedback to bias circuit
A wideband integrated circuit amplifier includes a pair of current mirror circuits sensing emitter currents of NPN and PNP transistors in the amplifier output stage. A pair of current mirror...
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4879522 |
Integrated complementary push-pull B final stage
To actuate a complementary push-pull class B final stage complementary driver transistors are provided whose emitters are electrically interconnected and connected to the collectors of the two...
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4878032 |
Amplifier stage with collector output
This amplifier stage has saturation control and high dynamics. The stage comprises a pair of input current sources connected in series between a pair of reference voltage lines, a pair of output...
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4868518 |
Quiescent current setting for an amplifier circuit
An amplifier circuit, for example, a class AB output stage, includes a series arrangment of a first transistor (T 1 ) and a second transistor (T 2 ), both arranged as diodes, a series arrangement...
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4837523 |
High slew rate linear amplifier
An improved linear amplifier circuit includes controlled current sources connected to supply additional current to the output stage during rapid change of applied signal. The current sources are...
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4833424 |
Linear amplifier with transient current boost
An improved linear amplifier circuit includes current mirror circuits that are cross connected in the collector circuits of input transistors for supplying proportional current to circuit nodes...
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4827223 |
Buffer amplifier
An improved direct-coupled amplifier includes a push-pull pair of transistors in an output stage that provides high output current on low quiescent current. Each such output transistor is driven by...
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4816773 |
Non-inverting repeater circuit for use in semiconductor circuit interconnections
A semiconductor non-inverting repeater circuit utilizes a pair of current mirrors operating in a balanced source/sink operation during non-input signal periods to provide quiescent biasing current...
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4814723 |
Integratable class AB output stage for low-frequency amplifiers
To obtain a constant quiescent current, high dynamics and high stability of a class AB output stage of low-frequency amplifiers, comprising an input transistor; a driving circuit comprising a...
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4799027 |
Low-frequency amplifier
The invention relates to a low-frequency amplifier with an integrated push-pull B final stage and a circuit for adjusting the quiescent current. The invention resides in the amplifier comprising...
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4780689 |
Amplifier input circuit
An improved amplifier input circuit for use as the input stage for a current feedback amplifier to reduce offset and limit overload currents. The circuit includes first and second bias current...
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4752745 |
Opto-isolated bias circuit for operating push-pull amplifiers in class A and class AB modes
A high fidelity audio amplifier of the push-pull complementary symmetry type, featuring a feedback circuit with a bias sensing element connected to the output terminals of the output transistors....
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4727336 |
Wide band low power loss video amplifier
Two cascode amplifiers are connected in parallel and include RC bypass circuits across their emitter and collector load resistors. The amplifiers are biased so that positive going transitions of an...
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4706035 |
High efficiency amplifier having a bootstrap capacitor
A high-efficiency class-G type amplifier comprises a first transistor (T 1 ), having its collector connected to a first supply voltage (V 1 ) via a first diode (D 1 ) and a second transistor (T 2...
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4706039 |
Amplifier arrangement
A class-G amplifier comprises first, second and third terminals connected to a load, first supply voltage (V 1 ) and second supply voltage (V 2 ), respectively, where V 2 >V 1 . First (T 1 )...
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4682059 |
Comparator input stage for interface with signal current
A current interface has an impedance buffering circuit which maintains a very low input impedance at an input node, while producing currents to two current outputs which increase and decrease,...
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4656435 |
Constant biasing circuit and operational amplifier using said circuit
A constant biasing circuit is made to maintain a fixed difference of potential between two circuit nodes A and B otherwise at floating potential levels. The biasing circuit is made of series...
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4651112 |
Audio amplifier system
An audio amplifier system is provided including a transformer having a first primary winding that is center-tapped, a second primary winding and a secondary winding. The amplifier system includes a...
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4649235 |
Telephone circuit with a class-B amplifier output stage
The telephone amplifier of an audio transmission circuit comprises a class-B output stage as a result of which the required supply current of this amplifier is considerably lower than with prior...
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4639685 |
Offset reduction in unity gain buffer amplifiers
Unity gain buffer amplifier circuits having a reduced input-to-output offset voltage characteristic are described. Compensation for the effects of base-to-emitter voltage variations and early...
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4607232 |
Low voltage amplifier circuit
An electronic circuit is provided comprising: a pair of transistors having collector electrodes connected together at an output terminal and emitter electrodes coupled to opposite potentials of a...
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4607233 |
Push-pull amplifier circuit with stable class AB operation
To obtain class AB operation of a push-pull amplifier which uses a preamplifier and an output amplifier having complementary output transistors, the base-emitter voltage of the first output...
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4594560 |
Precision setting of the bias point of an amplifying means
An amplifying stage and a biasing stage for the amplifying stage, each include the same number and same types of IGFETs. The biasing stage components are interconnected to produce a control voltage...
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4588961 |
Amplifier with extended output drive capability
An operational amplifier is provided with at least one output supplementary stage and current mirror amplifiers for coupling amplified signal current variations to drive supplementary output stage...
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4586002 |
Audio amplifying apparatus and method
An audio amplifier operatively connected to the secondary winding of a power transformer. The primary winding of the transformer is connected through a control circuit which has switch means that...
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4586001 |
Low voltage push-pull amplifier
A Class B push-pull amplifier designed for use at low supply voltages (e.g. 1 to 2 volts) wherein complementary push-pull output transistors T 3 , T 4 are biased by a biasing chain consisting of...
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4575686 |
Output stage for power amplifiers
The output stage for power amplifiers, in particular of the minimum drop, low tension type, is intended for use with apparatus which do not require a high output current, which output stage can...
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4570128 |
Class AB output circuit with large swing
An output stage is disclosed wherein class AB bias is employed. The stage is quiescently biased by means of current mirrors so that the bias is controlled mainly by ratioed geometric elements. The...
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4560946 |
Power amplifier
A power amplifier with a low distortion and a high power efficiency includes a first amplifier of the low distortion type for being powered by a first voltage source to amplify an input signal...
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4555674 |
Power audio-amplifier with automatic adjustment of the bias current absorbed by the final stage
A current control circuit coupled to the final stage of the amplifier automatically adjusts the bias current of the final stage so that it is low in the no-load state and higher in the load state....
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4549147 |
Load impedance detector for audio power amplifiers
Disclosed is a load impedance detector for detecting a variation of the load impedance of a single-ended push-pull amplifier having a pair of first and second transistors, the emitters of which are...
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4544895 |
Audio-amplifier arrangement
An asymmetrically driven audio amplifier arrangement comprises two amplifiers (1, 10) whose outputs (3, 12) are each connected to a common capacitor (18) via an associated loudspeaker (7, 16). The...
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4540950 |
Wideband linear amplifier
A linear amplifier circuit includes input and output signal ports and a pair of signal amplifying circuits. Each signal amplifying circuit couples an input signal from the input signal port to the...
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4540951 |
Amplifier circuit
A push-pull amplifer circuit using bipolar transistors in which non-linear distortion caused by the base-emitter voltages of the amplifying transistors of the circuit is eliminated without the use...
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4536662 |
Bidirectional constant current driving circuit
A bidirectional constant current driving circuit is connected between the positive and negative terminals of a power supply. This drive circuit has an input terminal and an output terminal with a...
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4531099 |
Amplifier
An amplifier includes a differential amplifier which is supplied with a small amplitude signal in a normal condition and a large amplitude signal in an abnormal condition. Resistors and diodes...
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4529948 |
Class AB amplifier
A class AB CMOS amplifier having a particular circuit configuration and useful in a variety of products such as operational amplifiers, chopper stabilized amplifiers, commutating autozero...
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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...
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4518928 |
Power supply circuit for amplifier
A power supply circuit for an amplifier is improved with respect to efficiency and lack of distortion by providing a circuit for supplying a voltage corresponding to the output signal level of the...
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4502020 |
Settling time reduction in wide-band direct-coupled transistor amplifiers
A wide-band direct-coupled transistor amplifier exhibits greatly improved settling time characteristics as the result of circuitry permitting the use of current feedback rather than voltage...
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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...
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RE31749 |
Class B FET amplifier circuit
A complementary inverter amplifier circuit comprising a complementary inverter including a p-channel MIS FET connected to a first source potential, an n-channel MIS FET connected to a second source...
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4476444 |
Power amplifier circuit
A power amplifier circuit comprises a class A amplifier having a pair of output amplifying devices responsive to an input for driving a load, a power supply connected between power supply terminals...
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