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| Number | Title | Issue Date |
| 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 |
| 5453717 | H-bridge type power amplifier and its blocking means The invention concerns H-bridge type power amplifiers and their blocking means. The memory effect of the capacitive impedance of control inputs of each of the two blocking transistors-in the H-bridge is used to block and unblock the amplifier synchronousl... | 09/26/1995 |
| 5343171 | Circuit for improving carrier rejection in a balanced modulator A carrier rejection circuit for improving carrier rejection in a balanced modulator includes balun transformers, connected to the carrier signal port and the modulated signal port, which reduces parasitic carrier leakage by reducing the average voltages a... | 08/30/1994 |
| 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 |
| 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 |
| 4954790 | Enhanced coupled, even mode terminated baluns, and mixers and modulators constructed therefrom A balun section formed of a pair of transmission lines connected between separate pairs of corresponding input and output terminals with a pair of capacitors connected in series between the output terminals and another transmission line connected in serie... | 09/04/1990 |
| 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 |
| 4868528 | Ring-mounted microwave device An microwave device of the diode-operated amplitude modulator or switch type is disclosed. The ring is formed by a source of symmetrical currents which powers the diodes connected to a load. When the diodes are off, they show a capacitance which gives a r... | 09/19/1989 |
| 4637069 | Doubly balanced diode mixer comprising a ring modulator each leg of which comprises a high speed conventional diode in series with at least one diode of the "varactor" kind A doubly balanced mixer comprising a ring modulator each leg of which is formed by the series connection of a high speed switching diode and one or more diodes with low intrinsic resistance and with high accumulated charges, preferably of the "varactor" o... | 01/13/1987 |
| 4534062 | Adjustable double balanced mixer A DC current injectable double balanced diode ring mixer circuit for radio frequency (RF) application. The diode ring includes eight diode elements and defines eight terminals including four symmetrical DC injection ports in conjugate pairs interleaved wi... | 08/06/1985 |
| 4509202 | Full-wave rectification of signals generated by radio frequency transmitting circuits A rectifier, preferably a bridge rectifier, is connected in series between a radio frequency (RF) signal generator and audio signal generator, and an antenna included in an RF signal transmitting circuit for rectifying the signal generated by the transmit... | 04/02/1985 |
| 4418319 | Signal processing product circuitry Signal processing circuitry, preferably for use in multiplying two input signals, one at RF frequency and one at baseband frequency, which includes at least a basic four branch bridge circuit having a diode connected in each branch in a generally symmetri... | 11/29/1983 |
