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| Number | Title | Issue Date |
| 6384685 | Complementary metal oxide semiconductor class AB amplifier A CMOS class AB amplifier has an adaptive level shift circuit, a compensated capacitor, and an output transistor pair. The adaptive level shift circuit includes a current mirror circuit, a diode transistor, a switch transistor, and a current source transi... | 05/07/2002 |
| 6384683 | High performance intermediate stage circuit for a rail-to-rail input/output CMOS operational amplifier An intermediate stage for a rail-to-rail input/output CMOS opamp includes a floating current source separating two current mirrors (151-154,155-158), where the ideal current source includes a floating current mirror (500,501,502,503,504,505) enabling an o... | 05/07/2002 |
| 6380801 | Operational amplifier An operational amplifier having two differential input stages. A first one of the stages comprises a pair of first input transistors and another one of such stages comprises a pair of second input transistors. The second input transistors are complementar... | 04/30/2002 |
| 6373337 | Differential amplifier An integrated circuit (IC) differential amplifier is disclosed. The differential amplifier comprises two amplifier stages each containing a transistor amplifier stage connected to one of the inputs of a push-pull input (RFin, RFXin) ... | 04/16/2002 |
| 6366169 | Fast rail-to-rail class AB output stage having stable output bias current and linear performance A class AB output stage includes an amplifying stage adapted to produce first (9) and second (10) output signals which incrementally increase and decrease in response to an incremental increase and decrease, respectively, of a first input signal (Iin... | 04/02/2002 |
| 6362605 | Method and apparatus for providing power to an integrated circuit A method and apparatus for efficiently powering an integrated circuit include processing that begins by generating a representation of a battery voltage. The processing then continues by producing a regulated bias current based on the representation of th... | 03/26/2002 |
| 6362686 | Fast saturation recovery operational amplifier input stage An operational amplifier input stage includes a first differential input transistor and a second differential input transistor receiving a differential input voltage. A first translinear loop is coupled to the first differential input transistor and a sec... | 03/26/2002 |
| 6359512 | Slew rate boost circuitry and method An operational amplifier includes a differential input stage (30) having first (2) and second (3) input conductors, a class AB output stage (20) coupled to an output of the differential input stage (30) and including a pull-up transistor (M11) having a so... | 03/19/2002 |
| 6356153 | Rail-to-rail input/output operational amplifier and method A rail-to-rail differential amplifier includes first and second input terminals, and an output terminal and an input stage including differentially connected N-channel first and second input transistors, and differentially connected P-channel third and fo... | 03/12/2002 |
| 6351186 | Operational amplifier with enhanced-gain output stages The invention relates to a Class AB operational amplifier providing both output gain enhancement and adaptative output bias. The operational amplifier includes first and second output terminals; a main differential stage having first and second differenti... | 02/26/2002 |
| 6351187 | Structure of operational amplifier An operational amplifier including a differential amplifier circuit, and a reverse output buffer. The reverse output buffer has a first forward switch, a second forward switch, a first reverse switch, and a second reverse switch. The first forward switch ... | 02/26/2002 |
| 6342814 | Operational amplifier An operational amplifier includes: a differential input section for generating a first signal corresponding to a differential voltage between two input signals; an amplifying section for amplifying the first signal in voltage to generate second and third ... | 01/29/2002 |
| 6329878 | Method and apparatus for improving power supply rejection in amplifier rail to rail output stages Apparatus and methods to provide high supply rejection and rail-to-rail output swing at the output of an amplifier circuit. A power source supplies power to a low noise regulator and to a differential amplifier output stage. The low noise regulator suppli... | 12/11/2001 |
| 6326847 | High gain, high speed, rail-to-rail amplifier A high gain, high speed rail-to-rail amplifier that comprises two symmetrical input stages: an n-input stage responsive to middle and high range input voltages and a p-input stage responsive to low and middle range input voltages. A gain stage, in electri... | 12/04/2001 |
| 6317000 | Overload recovery circuit and method An operational amplifier includes an input stage (13) receiving an input signal (Vin) and having first (14) and second (16) output terminals, and also includes an output stage (10) having a pull-up transistor (M11) and a pull-down transistor (M2). The pul... | 11/13/2001 |
| 6316998 | Differential amplifier and a method of compensation In a differential amplifier that is formed by a first differential amplifier formed by a first FET (MP1), to which a first input is applied, and a second FET (MP2), to which a second input is applied, a second differential amplifier formed by a third FET ... | 11/13/2001 |
| 6316999 | Operational amplifier An operational amplifier comprising output stages K2 and K3 for outputting an output signal So in response to an input signal Si, wherein; said output stages perform a push-pull operation respectively in response to a plurality of specific signals generated on... | 11/13/2001 |
| 6307438 | Multistage operational amplifier with stability control A multistage operational amplifier includes a transconductor input stage, an output stage, and an intermediate stage. A first Miller capacitor is connected between the input and the output of the intermediate stage. A second Miller capacitor is connected ... | 10/23/2001 |
| 6304143 | Amplifier slew rate boosting scheme An amplifier slew rate boosting scheme for use with an amplifier having a closed-loop gain equal to or very near unity has one plate of a compensation capacitor conventionally coupled to an internal high impedance gain node, but has the other plate of the... | 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 |
| 6285256 | Low-power CMOS voltage follower using dual differential amplifiers driving high-current constant-voltage push-pull output buffer An amplifier designed from CMOS transistors provides a high current output, despite having a unity-gain configuration. A push-pull output stage drives the output using a p-channel pull-up transistor and an n-channel pull-down transistor. The pull-down tra... | 09/04/2001 |
| 6281751 | Frequency compensation for single-ended class AB operational amplifiers with fully-differential input stages A class AB operational amplifier has first and second intermediate differential nodes respectively driving intermediate stage inverting and non-inverting amplifiers to produce a single-ended output voltage, which are provided with a frequency compensating... | 08/28/2001 |
| 6281752 | Amplifier with improved, high precision, high speed and low power consumption architecture In an amplifier with improved, high precision, high speed and low power consumption architecture, comprising an input stage (1), an intermediate stage (2) and an output stage (3), the intermediate stage (2) is provided by combining two complementary class... | 08/28/2001 |
| 6278322 | Transconductance amplifier and automatic gain control device using it A first output stage outputs current to an output terminal via current-mirror circuits based on a voltage difference input to non-inverting and inverting terminals. A second output stage comprises current providing transistors connected with the current-m... | 08/21/2001 |
| 6275108 | Circuit and method for control of amplifier operating angle A method and apparatus for controlling amplifier operating angle provides a corresponding increase in amplifier efficiency through a continual adjustment of operating angle from Class A, through Class AB, to Class B, an improved bandwidth in the output st... | 08/14/2001 |
| 6268769 | Operational amplifier An operational amplifier includes a differential amplifier stage having positive and negative input terminals formed by a pair of differential amplifier circuits, a current mirror stage having a pair of current mirror circuits coupled to the differential ... | 07/31/2001 |
| 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 |
| 6259901 | Radio-frequency power amplifier of mobile communication equipment A radio-frequency power amplifier of mobile communication equipment includes a differential amplifier arranged to balanced-input and amplify a radio-frequency signal delivered from a frequency converter of a transmission system of the mobile communication... | 07/10/2001 |
| 6259280 | Class AB amplifier for use in semiconductor memory devices A class AB amplifier (400) is disclosed, having a first input node (402), a second input node (404), and an output node (406). A push-pull input stage (412) includes cross-coupled pairs of transistors, which form a charge current path and a discharge curr... | 07/10/2001 |
| 6249184 | Rail-to-rail input stage A rail-to-rail input stage (20) for an operational amplifier having a constant transconductance (Gm) over a common mode range. The input stage has a cross-coupled quad circuit (Q9, Q10, Q15, Q16) having an essentially infinite transconductance, and pair o... | 06/19/2001 |
| 6246288 | Operational amplifier In order to reduce power consumption and prevent crossover distortion, the difference between a negative phase input voltage and a positive phase input voltage is amplified at a differential stage and a differential output voltage is output. The state of ... | 06/12/2001 |
| 6236270 | Operational amplifier circuit including folded cascode circuit The operational amplifier circuit of the present invention includes a first pair of NMOS which receives a first and a second input voltages to respective gate electrodes and has the source electrodes connected in common, a first pair of PMOS whose gate el... | 05/22/2001 |
| 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 |
| 6218900 | Operational amplifier phase reversal protection An integrated circuit operational amplifier (op amp) is protected from input voltage levels which may cause output phase reversal of the op amp. Voltage comparators monitor the input voltages to the op amp differential input transistor pair. The op amp an... | 04/17/2001 |
| 6215357 | Operational amplifier An operational amplifier provided with input and output stages comprises detecting means for detecting a differential voltage between a normal input signal terminal and an inverted input signal terminal of aforesaid input stage; and current varying means ... | 04/10/2001 |
| 6208208 | Operationally amplifying method and operational amplifier An operational amplifier circuit including a differential amplifier circuit and a current mirror circuit. The differential amplifier circuit amplifies a signal which enters a non-inverted input terminal and an inverted input terminal. The differential amp... | 03/27/2001 |
| 6194966 | Cmos class ab operational amplifier operating from a single 1.5v cell A method and circuits are disclosed for an operational amplifier operating from a single cell 1.5 Volt supply which consumes very little power, and which can handle rail-to-rail input common mode and output signal swings. Low voltage and low power operati... | 02/27/2001 |
| 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 |
| 6169454 | Receive amplifier for high speed data A receive amplifier for high-speed data has a differential input stage with a very wide common-mode rejection range and low offset voltage. This input stage interfaces the differential data signals to be received. The input stage is a dual complementary d... | 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 |
