Class 327/491 - With emitter follower

Subclass of Class 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
Definition: Subject matter wherein the control circuit has a transistor
No. of patents: 28
Last issue date: 08/31/2004

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Number	Title	Issue Date
6784743	High frequency amplifier and frequency mixer A high frequency amplifier in which a common emitter bipolar transistor is used, and in that a constant current source and a constant voltage source are switched to apply a DC bias to a base terminal of the bipolar transistor in accordance with a power level of a hi...	08/31/2004
6593798	Voltage follower and related method of regulation A voltage follower includes a follower stage including first and second bipolar junction transistors connected in cascade, and a first current generator connected to the follower stage for biasing the first and second bipolar junction transistors. A casco...	07/15/2003
6300669	Semiconductor integrated circuit device and method of designing same A semiconductor integrated circuit device comprises a multiple-stage amplifier including a plurality of transistors. The multiple-stage amplifier has a first stage comprising a plurality of bipolar transistors each having a single emitter structure. The b...	10/09/2001
6225839	Buffer circuit To provide a buffer circuit that is able to achieve a reduction of the input current and a high input impedance by compensating the base current of a transistor, and to avoid a lowering of the input dynamic range by means of a current compensation circuit...	05/01/2001
6100726	High input impedance buffer circuit having a high-side current source circuit with RCB cancellation A buffer circuit having a high input impedance. The buffer circuit comprises an input lead, a first stage having a first emitter follower transistor and a first level shifter transistor, a second stage having a second emitter follower transistor and a sec...	08/08/2000
6037891	Low power serial analog-to-digital converter A low power serial A/D converter cascades multiple stages (20) of a novel track-and-hold circuit (22) to implement a pipelined A/D converter. The track-and-hold circuit (22) is implemented using a differential structure to cancel out signal droop. This al...	03/14/2000
5952736	Pulse output circuit A pulse output circuit which has an output stage connected to a capacitive load capable of improving a through-rate of an input pulse signal with reduced power consumption is provided. A circuit having a first transistor which is supplied with a base curr...	09/14/1999
5880610	Current-to-voltage converting device and light receiver A device for converting a current pulse signal into a voltage pulse signal through a conversion from a current to a voltage includes a converting unit converting the current pulse signal into a first voltage signal, a voltage reducing unit generating a se...	03/09/1999
5841312	Gating circuit having current measuring and regulating elements and a temperature measuring transistor The gating circuit has a power transistor (T1, T2, T3) and a current measuring resistor (R5) connected with the power transistor so that a voltage drop at the measuring resistor is a measure of a current flow in the power transistor. This voltage drop is ...	11/24/1998
5546045	Rail to rail operational amplifier output stage An integrated circuit output stage is intended for use with an operational amplifier. The output is capable of driving capacitive load to within a VSAT of the power supply rails. The complementary output transistors are driven by way of a combi...	08/13/1996
5539350	Common mode logic line driver switching stage A line driver switching stage includes a terminal for a reference potential, a terminal for a supply potential, and an output terminal of the line driver switching stage. A differential amplifier has a first and a second amplifier branch. The first amplif...	07/23/1996
5485110	ECL differential multiplexing circuit An ECL multiplexing circuit (20) includes two differential pairs (21 and 22) for receiving first and second ECL level input signals, emitter-follower output transistors (27 and 28), and a differential pair (31 and 32) for receiving differential clock sign...	01/16/1996
5469104	Active folded cascode An active folded cascode includes an amplifier transistor and a source follower transistor configured as a folded cascode with the drain of the amplifier transistor and the source of the follower transistor connected to form a gain node. A feedback transi...	11/21/1995
5463345	Circuit for converting unipolar input to bipolar output The circuit for converting unipolar input to bipolar output includes a differential amplifier, first and second feedback resistors; and a peak detector. The negative output of the differential amplifier is fed back to the positive input of the differentia...	10/31/1995
4958094	Emitter follower circuit with MOSFET In an emitter follower circuit including an emitter follower transistor (Q3, Q4), and a series-connected circuit connected to the emitter of the emitter follower transistor and including a current source (Q3, Q4) and a current source resistor, the current...	09/18/1990
4937478	Circuit configuration for low-distortion signal switching A circuit configuration for low-distortion switching of signals to a given operating potential includes a countercoupled operational amplifier having an output, a push-pull end stage connected to the output, a differential amplifier stage connected to the...	06/26/1990
4751404	Multi-level ECL series gating with temperature-stabilized source current In a multi-level ECL series gating circuit with three levels of gating which operates over specified operating circuit voltage and operating circuit temperature ranges, provision is made for stabilizing the magnitude of the circuit source current over the...	06/14/1988
4716305	Switching device having a feedback means for rendering a control circuit inoperative in response to a current supply circuit being inoperative A switching device includes a current supply circuit, a control circuit, and means for feedback from the current supply circuit to the control circuit. The current supply circuit supplies current to a load. The control circuit controls operating and non-o...	12/29/1987
4581541	Switch device equipped with muting function In a switch device comprising a plurality of analog switches for switchingly selecting a desired signal out of a plurality of input signals, means is provided for preventing pop noise from occurring when the switching operation is performed....	04/08/1986
4449067	Low power, process and temperature insensitive FET bias circuit A bias circuit for an FET switch in which a pinch-off voltage is generated and sets up a current through a first resistor. The current is reflected through a second resistor to establish a voltage differential across the second resistor which is then impo...	05/15/1984
4367419	Analog switch An analog switch having a first feedback amplifier supplied with a signal superposed with a bias voltage and a second feedback amplifier supplied with the bias voltage. Each amplifier has a differential amplifier formed of two symmetrically connected tran...	01/04/1983
4287435	Complementary transistor inverting emitter follower circuit A complementary bipolar transistor circuit characterized by the same output impedance for positive and negative input voltage transitions, only a single collector path delay between input and output for both senses of input voltage transitions and very lo...	09/01/1981
4284912	Switching circuits for differential amplifiers In a differential amplifier comprising first and second transistors of one conductivity type and having emitter electrodes commonly connected, a switching circuit is provided which includes third and fourth transistors of the opposite conductivity type. A...	08/18/1981
4262218	Signal switch circuit for plural analog signals A signal switch circuit which comprises a first emitter follower transistor supplied with an input signal of a first channel, and a second emitter follower transistor supplied an input signal of a second channel. The collectors of the first and second emi...	04/14/1981
4258274	Double balance type switching circuit There is provided a double balance type switching circuit including a switching control signal generator; a first differential amplifier formed of first and second transistors; a second differential amplifier connected between the collector of the first t...	03/24/1981
4236088	Noise-free switching circuit for and method of electronically selecting audio input signals in audio systems A noise-free electronic switching circuit selects one of a pair of audio input signals in an audio system. Each input signal is connected by separate conductors to a single output terminal. The output terminals of two transistors are respectively connecte...	11/25/1980
4096399	Crosspoint bias circuit arrangement A semiconductor transmission circuit arrangement which utilizes symmetrical transmission transistors and bias circuitry which exhibits a high output impedance and is arranged to maintain equal d.c. bias currents in the base and the emitter/collectors of t...	06/20/1978
3986051	Signal switching apparatus Signal switching apparatus is disclosed whereby a selected one of a plurality of supplied input signals is switched to an output terminal, including a switching circuit having plural input terminals for receiving the input signals and an output terminal t...	10/12/1976

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Class 327/491 - With emitter follower