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| Number | Title | Issue Date |
| 7395034 | Clipping circuit and radio transmitter using the same A clipping circuit to limit amplitude of an orthogonal baseband signal includes a 16-gonal clipping circuit almost equivalent to a circular clipping circuit. The 16-gonal clipping circuit includes plural stages of series-connected units each including a rectangular ... | 07/01/2008 |
| 7353010 | Techniques for fast automatic gain control An automatic gain control (AGC) technique can quickly sense signal size over a large dynamic range by using a peak detector block in the analog portion of the receiver. The peak detector block can compare a received signal to predetermined thresholds (chosen to divi... | 04/01/2008 |
| 7289575 | Signal processing means A non-linearity generator operates on a signal between a frequency converter and an amplifier and acts as a postdistorter for the component it follows and as a predistorter for the component it precedes, thus linearizing the overall input-output characteristic of th... | 10/30/2007 |
| 7176910 | Driving circuit for display device A driving circuit for driving a capacitive load promptly to a target voltage is to have a broad dynamic range and achieve a high accuracy output and saving in the surface area with low power dissipation. A first period and a second period are provided in one data dr... | 02/13/2007 |
| 7123072 | High-accuracy capacitor digital-to-analog converter A capacitor digital-to-analog converter for N-bit digital-to-analog conversion comprises a converter capacitor network comprising 2N capacitors and 2N+1 MOS switches and an output buffer. The MOS switches are connected in a series chain at thei... | 10/17/2006 |
| 7106132 | Feed-forward operational amplifiers and methods of using the same A feed-forward operational amplifier including a dedicated summer circuit for summing a signal generated by a first amplifier stage of a feed-forward amplifier and a signal received from an external source to generate a sum signal and a second amplifier stage couple... | 09/12/2006 |
| 7053717 | Method and apparatus for realizing a low noise amplifier A multi-stage amplifier including a first amplifier stage including a first transistor, the first transistor selected to provide an optimum noise characteristic, and a second amplifier stage including a second transistor, the second transistor selected to provide an... | 05/30/2006 |
| 6927628 | Gain-control method and device for cascaded amplifiers A gain-control method and device that enable high-speed gain switching of cascaded programmable gain amplifiers (PGA) without a high-resolution A/D converter is provided. In one example, the gain-control method for cascaded PGAs detects all the input levels of the P... | 08/09/2005 |
| 6873703 | Precision, low-power current-sense transmission channel for subscriber line interface circuit, programmable with single ended impedances and capable of exhibiting a voltage sense response A transmission channel for a subscriber line interface circuit comprises a front end, tip/ring current-sensing transimpedance stage, containing relatively low valued tip and ring sense resistors coupled in circuit with tip and ring paths of a telecommunication wirel... | 03/29/2005 |
| 6861910 | Multistage amplifier and integrated circuit An initial-stage amplifier 1 that deals with microsignals and other amplifiers 2 and 3 separate a power source line, and both separated power source lines 4 and 8 are commonly connected to a power source pad 6. This enables ... | 03/01/2005 |
| 6753727 | Sequential DC offset correction for amplifier chain An amplifier chain with sequential DC offset correction for use in a radio receiver is provided. The amplifier chain has at least first and second amplifier stages connected in series. The first and second stages include an amplifier and a track and hold circuit con... | 06/22/2004 |
| 6750724 | Multistage amplifier A bias condition of at least one amplifier among amplifiers other than a last-stage amplifier is set in consideration of the relation between an idle current and a saturation current. ... | 06/15/2004 |
| 6680647 | Low noise amplifier circuit with phase matched switch topology An amplifier and bypass switch circuit includes a circuit input, a circuit output, an amplifier and a switching circuit. The amplifier has an amplifier control input, and a first amplifier output. The amplifier control input is connected to the circuit in... | 01/20/2004 |
| 6577187 | Powered transducer preamplifier with DC level shifting circuit A powered transducer preamplifier includes a preamplifier circuit that DC couples the preamplifier input with the preamplifier output. A biasing circuit is coupled to the preamplifier input to apply a bias voltage to power the transducer, and a DC level s... | 06/10/2003 |
| 6573787 | Elimination of noise during power supply switching in an audio amplifier circuit An audio amplifier circuit comprises a voltage-gain amplifier and a current-gain amplifier in series between an input node and an output node. Power supply lines are provided for providing power to the audio amplifier circuit. An outer negative feedback l... | 06/03/2003 |
| 6566942 | Multistage amplifier circuit A coupler/isolator alternatively couples and isolates unit amplifiers of a multiple stage chopper amplifier to shift gradually and slightly reset timing and amplification timing of the chopper amplifiers. In this way, a first-stage chopper amplifier to an... | 05/20/2003 |
| 6556077 | Instrumentation amplifier with improved AC common mode rejection performance A method and apparatus for improving the AC common mode rejection performance of monolithic two op-amp instrumentation amplifiers is disclosed. A new approach to designing the first op-amp of an instrumentation amplifier is provided wherein the frequency ... | 04/29/2003 |
| 6532357 | Radio communication device and transmission power control method for radio communication device A radio communication device has a first variable power amplifier 19 and a second variable power amplifier 20 and performs gain control of the variable power amplifiers 19 and 20 by a variable power amplifier control section 27 for controlling transmissio... | 03/11/2003 |
| 6480062 | Reflection amplifier circuit An amplifier circuit for amplifying an input signal to generate an amplifier output signal incorporates a cascaded series of reflection amplifiers arranged along a signal path and operative to amplify signals propagating in a forward direction along the s... | 11/12/2002 |
| 6466091 | High order multi-path operational amplifier with reduced input referred offset Disclosed in this application is the placement of an additional integrator between the first stage integrator output and the input to the attenuator/low pass filter. This approach reduces the input referred offset by a factor equal to the gain of the addi... | 10/15/2002 |
| 6380804 | Method and apparatus for switching stages of a multistage amplifier quickly between operational modes The stages of a multistage amplifier are quickly switched between operational modes, e.g., from a standby mode to an active mode. The delivery of a control signal to each individual stage is delayed so that the modes of the stages are switched, in a desir... | 04/30/2002 |
| 6342810 | Predistortion amplifier system with separately controllable amplifiers A wideband predistortion system compensates for a nonlinear amplifier's frequency and time dependent AM--AM and AM-PM distortion characteristics. The system comprises a data structure in which each element stores a set of compensation parameters (preferab... | 01/29/2002 |
| 6342811 | Integrated power amplifier which allows parallel connections An integrated power operational amplifier can alternatively be operated in a master or a slave mode, such that a master amplifier can be connected in parallel with one or more slave amplifiers. This arrangement allows very low impedance loads to be driven... | 01/29/2002 |
| 6333673 | Electronic circuit A switched capacitor anplifier circuit is provided with two independent reference voltages, one which provides an appropriate bias level for the amplifiers, and one which sets a common mode input level for the amplifiers, thereby allowing the dynamic rang... | 12/25/2001 |
| 6271784 | Capacitor-based digital-to-analog converter with continuous time output A digital-to-analog converter (DAC) including an array of switched input capacitors which store samples of charge proportional to a digital input signal, and an analog output circuit which integrates the samples of charge to generate an output analog sign... | 08/07/2001 |
| 6236265 | Radio station preamplifier circuit with interior and exterior preamplifiers A method and circuit for preamplifying reception signals for a radio station. A first preamplifier is connected between an antenna unit and to the radio station. A second preamplifier is provided in the radio station, the second preamplifier being bridged... | 05/22/2001 |
| 6232836 | In-line, unbalanced amplifier, predistortion circuit A plurality of amplifiers are connected in cascade to form an in-line predistortion circuit. The amplifiers are unbalanced in that each amplifier stage in the circuit has two DC voltage rails which are independently controlled to provide different, i.e. o... | 05/15/2001 |
| 6140870 | Hybrid thermionic valve and solid state audio amplifier A hybrid thermionic valve and solid state audio amplifier. A complete tube amplifier is scaled to produce a relatively low power yet also retain its small and large signal distortion characteristics. The output of the scaled amplifier is amplified by a re... | 10/31/2000 |
| 6043721 | Dual band amplifier An amplifier (104) for a dual band device includes multiple amplifier stages coupled between an input (103) and output (105). The amplifier stages include a first amplifier stage (200) having a first amplifier (206), a second amplifier stage (202) having ... | 03/28/2000 |
| 5912585 | Vacuum tube audio amplifying circuit In a direct coupled type vacuum tube amplifying circuit, to stabilize the operation and simplify the feedback loop, a plate power source EB5 is connected to a plate of a vacuum tube V5 of a first stage through a constant current source 1. A grid of a vacu... | 06/15/1999 |
| 5361039 | Power amplifier device for a composite signal The disclosure relates to the linear power amplification, in a single channel, of a composite signal formed by two independent signals. In a single channel formed by correction means followed by a linear preamplifier followed by a saturated amplifier, the... | 11/01/1994 |
| 5006814 | Current amplifier A current amplifier including two stages. A first stage is formed by a primary operational amplifier (IC1) connected in a virtual earth feedback configuration and having a feedback loop formed by a resistor (R1) and capacitor (C1) connected in parallel so... | 04/09/1991 |
| 4338530 | Low-pass filter for low-frequency signals A low pass-filter for low frequency signals having first portions situated above on one side and second portions situated on the other side of an average value. The filter comprises at least two integrators, each comprising a capacitor, included between t... | 07/06/1982 |
