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| Number | Title | Issue Date |
| 7369819 | Digital amplitude modulation transmitter with pulse width modulating RF drive A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-... | 05/06/2008 |
| 7343138 | Compensating for load pull in electromagentic signal propagation using adaptive impedance matching The invention relates to for processing an electromagnetic input signal, wherein the signal is passed through an input to be modified across a plurality of modifying segments using a characteristic of the signal, and wherein the plurality of segments have a pluralit... | 03/11/2008 |
| 7333778 | System and method for current-mode amplitude modulation An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from th... | 02/19/2008 |
| 7327184 | Low-power multi-level pulse amplitude modulation driver and semiconductor device having the driver A low-power multi-level pulse amplitude modulation (PAM) driver, and a semiconductor device having the same, in which the multi (M)-level PAM driver includes a load unit, first and second current sources, a pair of first input transistors, a pair of second input tra... | 02/05/2008 |
| 7310382 | Linearized switch-based power amplifier A power amplifier comprises a level-discretization modulator (210) and a mixing and amplifying stage (225), in combination with a properly designed negative feedback path. The feedback path forms an error compensation loop together with a properly sele... | 12/18/2007 |
| 7254195 | Apparatus, methods and articles of manufacture for dynamic differential delay correction The invention is directed to a system for dynamically correcting an electromagnetic wave by processing two or more aspects of the electromagnetic wave along two or more separate signal paths; comparing an expected value for at least one of the aspects of the electro... | 08/07/2007 |
| 7245183 | Apparatus, methods and articles of manufacture for processing an electromagnetic wave A method of processing an electromagnetic wave comprises regulating at least two independently controllable current sources with a signal determined from at least one characteristic of the electromagnetic wave to generate a processed electromagnetic wave from at lea... | 07/17/2007 |
| 7183958 | Sub-ranging digital to analog converter for radiofrequency amplification An apparatus and method for amplifying a radiofrequency signal using a main Digital to Analog Converter (RFDAC) and a subordinate Digital to Analog Converter (Sub-DAC). The main RFDAC provides a first portion of a N-bit digital output, which specifies the amplificat... | 02/27/2007 |
| 7154329 | Method and apparatus for compensating amplifier output for temperature and process variations An amplifier circuit includes a calibration circuit with a controllable circuit element such as a digital resistor. One or more properties of the controllable circuit element (e.g., the resistance in a digital resistor) is varied by a digital calibration word such t... | 12/26/2006 |
| 7119939 | Phase modulation circuit, test apparatus, and communication system A phase modulation circuit for outputting a modulated signal of an input signal which has been modulated to a desired phase. The circuit includes a light emitting element for emitting light according to an input signal and outputting a modulated signal, a bias curre... | 10/10/2006 |
| 7098719 | Multiplexer with clock suppression At least two inputs, at least one output and a clock source for the inputs are provided in a multiplexer. Each input balances an input signal and is coupled to a transistor circuit having two transistors with collectors commonly connected to a power potential. The t... | 08/29/2006 |
| 7092682 | Electronic circuit, modulation method, information processing device, and information processing method A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that th... | 08/15/2006 |
| 7041096 | Electrosurgical generator apparatus An electrosurgical generator apparatus controls a variable output signal to electrodes. The generator apparatus operates in a cut mode, a coagulation mode or a stimulate mode. The generator apparatus comprises a DC power supply that provides regulated low voltage an... | 05/09/2006 |
| 7035604 | Communications signal amplifiers having independent power control and amplitude modulation The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelop... | 04/25/2006 |
| 7023292 | Polar modulation using amplitude modulated quadrature signals Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component signals that are 90 degrees out of phase with each other. The controller g... | 04/04/2006 |
| 6930627 | Radio-frequency digital/analog converter system and method A radio frequency (RF) converter system and associated method are provided for generating and/or receiving RF signals. Included is a signal conversion circuit for digital signal processing (DSP) or converting between digital signals and analog signals. Further provi... | 08/16/2005 |
| 6208217 | Ask modulator with frequency dependent voltage divider An ASK modulator including a switching diode connected in series to a carrier signal transmitting path, a first resistor connected between one end of the switching diode and a digital signal input end and a second resistor connected between one end of the... | 03/27/2001 |
| 5982446 | Video modulator arrangement In a single-chip multistandard video modulator arrangement in which audio signals for transmission with video signals are first modulated onto a subcarrier and then combined with the video signals for modulation onto a VHF or UHF main carrier, the modulat... | 11/09/1999 |
| 5949296 | Power supply modulator circuit for transmitter The present invention relates to a power supply modulator for a radio transmitter having apportioned input impedance and buffered switching of power modules. A series arrangement of power supply modules, conventionally disposed in a diode cascade, include... | 09/07/1999 |
| 5736906 | Power supply modulator circuit for transmitter The present invention relates to a power supply modulator for a radio transmitter having apportioned input impedance and buffered switching of power modules. A series arrangement of power supply modules, conventionally disposed in a diode cascade, include... | 04/07/1998 |
| 5469126 | I/Q-modulator and I/Q-demodulator An I/Q-modulator or I/Q demodulator circuit in which the modulating signals (2, 3) are input through the output phase transfer branches of the circuit. In relation to the RF-characteristics, a series resistor (16) and a series inductance (20) in the phase... | 11/21/1995 |
| 5434546 | Circuit for simultaneous amplitude modulation of a number of signals A method for simultaneously imposing a single modulating signal on a number of constant frequency carriers includes applying the single modulating signal and all of the carriers to a doubly-balanced mixer circuit that produces sideband signals that are un... | 07/18/1995 |
| 5398008 | Circuit arrangement for amplitude-modulating the drive signal of a laser The universally-applicable circuit arrangement of the invention makes possible an adjustment procedure for holding emitted optical power of a laser constant independent of temperature and aging. This circuit arrangement may be carried out as a three-stage... | 03/14/1995 |
| 5345198 | Power supply modulator circuit for transmitter The present invention relates to a power supply modulator for a radio transmitter having apportioned input impedance and buffered switching of power modules. A series arrangement of power supply modules, conventionally disposed in a diode cascade, include... | 09/06/1994 |
| 5239275 | Amplitude modulator circuit having multiple power supplies An amplitude modulator circuit, having an input for receiving an input information signal and an output for providing an output signal, which is proportional to the input signal. The amplitude modulator circuit comprises at least two pass devices for ampl... | 08/24/1993 |
| 5214397 | Modulator using low-pass filter as delay element A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately 180°. The phase delay element has the form of a low pass fil... | 05/25/1993 |
| 5159295 | Microwave vector modulator and device for matching a microwave load A microwave vector modulator (4) of the reflective type is used to match a microwave load. The adjustable reflection of the vector modulator is obtained by semiconducting surfaces (18, 19, 20, 21), illuminated by light-emitting means (24, 25, 26, 27).... | 10/27/1992 |
| 5155455 | AM/FM modulator in which AM can be converted to FM by vector addition A modulator circuit comprises an input for receiving an audio frequency (AF) signal, an oscillator circuit for providing a carrier wave signal, a mixer circuit for mixing the AF input signal with the carrier wave signal to provide an AM modulated signal, ... | 10/13/1992 |
| 5153536 | Suppressed carrier modulator formed from two partial modulators each including a phase delay path A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator (1) has two partial modulators (1',1") forming a bridge. E... | 10/06/1992 |
| 5095290 | Amplitude modulator having negative feedback circuit for reducing distortion Modulator circuit (MOD) with a modulator proper and a correction signal generator. The modulator proper comprises the cascade connection of an amplifier (T11, T21, CS11, T12, T22, CS12) and a first switching circuit (R11, T31, T51, R12, T32, T52), while t... | 03/10/1992 |
| 5006811 | Dual quadrature frequency converter A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal are each phase shifted -90 degrees by the couplers. The RF a... | 04/09/1991 |
| 4952890 | Phase modulation compensated amplitude modulator using digitally selected amplifiers An RF amplitude modulated amplifier system is presented incorporating a plurality of RF amplifiers which are compensated for unwanted phase modulation. The system includes a common RF driver for supplying a common RF driver signal. A plurality of actuatab... | 08/28/1990 |
| 4635003 | Oscillator mixer circuit with reaction-tree coupling An oscillator and mixer circuit of an integrated UHF/VHF modulator circuit includes a single active oscillator circuit to be connected to frequency-determining passive circuits for UHF and multichannel VHF operation, a single mixer part mixing an oscillat... | 01/06/1987 |
| 4580111 | Amplitude modulation using digitally selected carrier amplifiers An amplitude modulator (10) is disclosed which generates an amplitude modulated carrier signal by selectively combining varying numbers of other carrier signals. A circuit (20) is included which provides plural carrier signals of like frequency and phase ... | 04/01/1986 |
| 4481490 | Modulator utilizing high and low frequency carriers To minimize carrier leak in the modulation of voice frequencies to the desired line frequency for a carrier system, a first balanced modulator is operated at a low frequency where low carrier-leak modulators may be constructed and a second balanced modula... | 11/06/1984 |
| 4399558 | Cascaded digital broadcast transmitter A digital AM broadcast transmitter features a plurality of stages that are controlled by a digital signal representing an audio modulating signal. At least some of the stages are cascade coupled together using transformers. This reduces the need for high ... | 08/16/1983 |
| 4346354 | Amplitude modulator using variable width rectangular pulse generator A method and apparatus for amplitude modulating a carrier signal with an audio or information input signal utilizes an arcsine generator to cause the envelope of the carrier to follow the input signal. The invention stems from the realization that if rect... | 08/24/1982 |
| 4336615 | Linear loading for PWM filter An AM broadcast transmitter uses a PWM modulator that requires a pulse width filter. It has been found that the filter load varies over the modulation cycle resulting in distortion. To overcome this problem, a varying voltage is applied to an RF driver st... | 06/22/1982 |
| 4319359 | Radio transmitter energy recovery system An AM transmitter includes an RF signal generator and a switching-type RF signal amplifier. The RF amplifier output depends upon the energizing voltage applied thereacross, so it acts as a modulator. The energizing voltage is produced by a high-power audi... | 03/09/1982 |
| 4300019 | Method and apparatus for multiplying an electrical signal A multiplier circuitry which multiplies an electrical signal by a multiplier signal comprises an oscillator which oscillates at a frequency having a predetermined relationship with respect to the multiplier signal, a first signal generator for producing a... | 11/10/1981 |
