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| Number | Title | Issue Date |
| 6320890 | Laser driving circuit capable of stably controlling laser output An input signal is supplied to an adder circuit via a gain control amplifier and integrating amplifier and output signals of the gain control amplifier and the integrating circuit are added together by the adder circuit. An output signal of the adder circ... | 11/20/2001 |
| 6304142 | Variable transconductance amplifier A variable transconductance amplifier comprises transistors and whose emitters are connected via resistors and to a constant current source to form a differential or long tail pair. A feedback amplifier whose transconductance is controllable has inputs co... | 10/16/2001 |
| 6300833 | DC gain enhancement for operational amplifiers A self compensating operational amplifier (10) including a differential amplifier input stage (18) and a current mirror (24) having an input and an output coupled to the respective outputs (20, 22) of the differential amplifier input stage is provided tha... | 10/09/2001 |
| 6278321 | Method and apparatus for an improved variable gain amplifier A method and apparatus for a variable gain amplifier has a well-regulated common mode output. The invention has particular applications to CMOS integrated circuits and has other applications. In a specific embodiment, the invention is used with a regulate... | 08/21/2001 |
| 6268734 | Operational amplifier input offset voltage and input bias current test circuit A precision op amp test circuit employs latching relays, the contacts of which are latched open or closed as necessary to make test measurements. The relays' metal contacts ensure low resistance conductive paths, and because the coil of a latching relay n... | 07/31/2001 |
| 6259322 | Current efficient, ultra low noise differential gain amplifier architecture A low noise, low current, high bandwidth differential amplifier circuit (30), including a first amplifier (44) driving a first transistor X1 and having a first current source I2 coupled to an input of the first amplifier (44). A firs... | 07/10/2001 |
| 6222416 | Signal amplifier circuit with symmetrical inputs and outputs The invention concerns an amplifier circuit for an IC whereby continuous symmetrical signal routing can be provided from the inputs to the outputs, without branches and crossovers and at low cost. The IC can be used as amplifier, buffer, line driver and l... | 04/24/2001 |
| 6215333 | Comparator for a wide supply voltage range A comparator is operable within a wide supply voltage range. A source follower is connected at the output side of a differential amplifier stage, and a switch closes a feedback loop from the source follower to the differential amplifier stage. A diode, wh... | 04/10/2001 |
| 6211730 | Pre-amplifier circuit A pre-amplifier circuit comprises an operation amplifier having a noninverting input terminal connected to a voice input terminal, a negative feedback circuit having a first resistor which is connected between an output terminal of the operation amplifier... | 04/03/2001 |
| 6208199 | Pulse amplifier with low duty cycle errors A low power pulse amplifier with low duty cycle errors. The amplifier provides several differential amplifier stages with a biasing and canceling network. To minimize duty cycle errors for large input signals, cascode transistors are added between the dra... | 03/27/2001 |
| 6188280 | Differential amplifier with gain linearization through transconductance compensation Disclosed is a differential amplifier including an emitter follower pair, a first differential pair, and a main differential amplifier. The emitter follower pair is operative to receive an input differential voltage signal for shifting the input different... | 02/13/2001 |
| 6188282 | Differential amplifier with reduced even order non-linearity and associated methods A differential amplifier having reduced even-order non-linearity is provided that comprises a differential amplifier and an analog voltage compensation circuit that is coupled to one of the input ports to the differential amplifier so as to provide an ana... | 02/13/2001 |
| 6181207 | Current amplifier having a low input impedance A current amplifier A1 includes two transistors Q1 and Q2 whose emitters are interconnected via a resistor R1. The input of the current amplifier is constituted by the emitter of the first transistor Q1, whose collector is connected to the output terminal... | 01/30/2001 |
| 6175276 | Indirect emitter-coupling preamplifier for magneto-resistive heads with single-ended feedback A preamplifier amplifies a differential signal from a magneto-resistive read head. The preamplifier is designed to maximize gain and minimize introduction of noise, while maintaining wide bandwidths and common mode rejection performance. The emitters of t... | 01/16/2001 |
| 6169453 | Error amplifier with a high common mode rejection A differential amplifier provides a high common mode rejection while maintaining substantially unchanged the input dynamic range. The differential amplifier includes a comparator having inputs to which are applied the two input signals, which are also app... | 01/02/2001 |
| 6163217 | Operational amplifier A current charged into or discharged from a phase-compensating capacitor C1 in an output circuit is controlled by a level shift circuit so that the current is kept constant for input signals inputted to the input terminals IN+ and IN- of a differential am... | 12/19/2000 |
| 6160450 | Self-biased, phantom-powered and feedback-stabilized amplifier for electret microphone A self-biased electret microphone amplifier with phantom powering which avoids the need for JFETs and depletion mode devices, both of which are not standard devices when using BiCMOS fabrication processes. Feedback is included to provide enhanced gain, dy... | 12/12/2000 |
| 6150885 | Transconductance amplifier with wideband noise filtering There is disclosed a transconductance amplifier receives a voltage input and provides a current output. The transconductance amplifier includes a current mirror having a lowpass filter between transistors implementing the current mirror.... | 11/21/2000 |
| 6141169 | System and method for control of low frequency input levels to an amplifier and compensation of input offsets of the amplifier A system and method for an amplifier control circuit is provided which does not require the use of a large off-chip or on-chip capacitor for achieving a low frequency coupling corner, while still effectively allowing AC coupling the data detection circuit... | 10/31/2000 |
| 6137359 | Low-distortion high-frequency amplifier The invention is an amplifier configuration which provides signal gain at very low levels of distortion. The inventive amplifier configuration consists of two amplifiers whose outputs are added to give the total amplified signal. A first amplifier functio... | 10/24/2000 |
| 6121818 | Mixer using replica voltage-current converter The present invention discloses a mixer using a replica voltage-current converter, and more particularly a mixer using the replica voltage-current (V-I) converter of the present invention, which feedbacks the output current of the replica voltage-current ... | 09/19/2000 |
| 6118340 | Low noise differential input, differential output amplifier and method A low noise differential amplifier includes a differential stage and first and second unbalanced differential feedback amplifiers. The differential stage includes first (13) and second (14) load devices coupled to first (11) and second (12) conductors, re... | 09/12/2000 |
| 6114908 | Bipolar impedance converter circuit The present invention describes a bipolar impedance converter circuit, which comprises a differential amplifier that has a closed-loop control circuit in its negative feedback loop. This closed-loop control circuit comprises npn transistors, which because... | 09/05/2000 |
| 6107888 | Method to equalize input currents to differential-to-single-ended amplifier configuration The present invention is a dual-input-to-single-output amplifier circuit having a processing amplifier, first and second coupling regions, first and second input impedance circuits, first and second feedback impedance circuits, first and second shunting i... | 08/22/2000 |
| 6069523 | Differential data driver A digital data driver includes a differential amplifier having transistors which operate as a push-pull amplifier in class C mode. The transistors are conductive or non-conductive and controlled in response to a differential data input signal. The driver ... | 05/30/2000 |
| 6052027 | Wideband operational amplifier having a plurality of feedback loops An amplifier having error correction and including an output stage containing output transistors being connected to the amplifier output, and an output error correction stage containing a first high open loop gain amplifier which includes one or more tran... | 04/18/2000 |
| 6052026 | Linear gain controlled amplifier A linear gain controlled amplifier comprising a differential transistor pair having an input and an output. The input is connected to a current supply which includes both AC and DC components. A voltage is derived which is proportional to the DC current c... | 04/18/2000 |
| 6046875 | Linear transconductance circuit having a large linear range A method for generating a response in a transconductance circuit includes receiving a circuit differential voltage input and providing a differential voltage input to each of a plurality of differential pairs to control, in part, a differential current ge... | 04/04/2000 |
| 6037759 | Voltage regulator capable of improving system response A voltage regulator capable of improving system response. The voltage regulator includes a feedback circuit and an operational amplifier. The input terminal of the feedback circuit is coupled to an output voltage terminal for attenuating signals coming ou... | 03/14/2000 |
| 6037834 | Method and apparatus for automatic gain control with improved response time and stability The AGC circuit and method especially applicable in circuits where fast response and stability of the system is necessary, such as where input signals are speech patterns. A gain feedback loop repeatedly adapts the gain and a long term average energy E | 03/14/2000 |
| 6031424 | Differential amplifier with improved voltage gain using operational amplifiers to eliminate diode voltage drops The present invention is a differential amplifier with circuitry to eliminate the effect of transistor impedance other than an actual load impedance on voltage gain. The circuitry includes a pair of transistors 400 and 402, each with a base connected to a... | 02/29/2000 |
| 6014054 | Differential amplifier circuit and load driving circuit incorporating the differential amplifier circuit A differential amplifier circuit has a differential amplifier circuit section for amplifying a difference voltage between an inverting input node and a non-inverting input node, and an output buffer circuit for outputting, to an output node, the amplified... | 01/11/2000 |
| 6011435 | Transmission-line loss equalizing circuit A transmission-line loss equalizing circuit includes an equalizer, a gain control circuit for controlling the gain of the equalizer based upon the peak value of an equalized output, a slicer for slicing the equalized output and outputting a data pulse, a ... | 01/04/2000 |
| 6008695 | Input amplifier for input signals with steep edges An input amplifier for input signals with steep edges has a MOS transistor, whose source or drain is connected to a node connected to an output stage. The output signal is fed back into the amplifier which prevents the MOS transistor from being turned off... | 12/28/1999 |
| 6008696 | Low noise amplifier with actively terminated input An impedance matching circuit includes a differential amplifier providing a differential output signal across two output terminals. The differential amplifier receives the input signal whose input impedance is to be matched at one of the differential inpu... | 12/28/1999 |
| 5999054 | Differential amplifier circuit A differential amplifier circuit including a differential input circuit which receives first and second input signals. The differential input circuit amplifies a potential difference between the input signals and outputs first and second voltage signals r... | 12/07/1999 |
| 5986502 | Multi-stage high-performance amplifier A two-stage switched-capacitor CMOS Miller-compensated amplifier uses only n-channel transistors in its signal path to reduce the deleterious effects of parasitic capacitances in the signal path while still obtaining a high transconductance in both stages... | 11/16/1999 |
| 5978240 | Fully differential voltage-current converter A fully differential voltage-current converter, comprising a differential operational amplifier which is supplied with a differential voltage to be converted into a current, a first transistor being fedback to a noninverting input of the amplifier, a seco... | 11/02/1999 |
| 5977571 | Low loss connecting arrangement for photodiodes Each of a plurality of photodiodes forming a photodetector is mounted on a respective metal pad on the surface of a semiconductor integrated circuit chip including a corresponding number of amplifier circuits for detecting the photocurrent from respective... | 11/02/1999 |
| 5969573 | Amplifier circuit with small offset voltage influence An amplifier circuit influenced less by an offset voltage and capable of permitting an as broad as possible dynamic range is provided. This amplifier circuit includes first and second MOS transistors M1, M2; a first operational amplifier OP1 having an inv... | 10/19/1999 |
