| Patent Number |
Title Of Patent |
Date Issued |
| 5369794 |
Adaptive oscillator frequency feedthrough cancellation in mixer circuit |
November 29, 1994 |
| The disclosure relates to the changing of frequencies. The mixing of a signal at a frequency Fe and of the signal of a local oscillator gives a resultant signal that comprises a first component at the useful frequency, a second component at the frequency of the oscillator and a third |
| 5361039 |
Power amplifier device for a composite signal |
November 1, 1994 |
| 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 filtering and symmetry effec |
| 5357213 |
High-frequency wide band amplifier having reduced impedance |
October 18, 1994 |
| A high-frequency wideband power amplifier, of the type comprising an amplifier stage with at least two transistors mounted as a differential stage, coupled at input and at output to a matching circuit further comprises, in order to convey each bias voltage to the amplifier stage, at |
| 5309167 |
Multifocal receiving antenna with a single aiming direction for several satellites |
May 3, 1994 |
| The receiving antenna comprises at least two sectors or sections of paraboloids focusing the radiation onto their axes at points F.sub.1 and F.sub.2 respectively offset by a whole number of wavelengths of the received radiation. Each sector or section is associated with a helicoidal |
| 5276904 |
System for receiving TV signals retransmitted by satellites |
January 4, 1994 |
| A system intended for the simultaneous reception of several TV channels retransmitted by satellites. This system comprises a multi-frequency microwave frequency head, installed in an external unit, whose inputs are connected to the satellite antennas. Wide band demodulation is made p |
| 5270814 |
Method and apparatus for measuring the linearity of a transmission system by detecting the stren |
December 14, 1993 |
| A method and apparatus for measuring and correcting nonlinearities in a transmission system which transmits a modulated wave having a maximum peak level N.sub.C and with a frequency band [F.sub.1, F.sub.2 ]. The system transmits a composite signal having a carrier frequency proximate to |
| 5204688 |
Omnidirectional antenna notably for the emission of radio or television broadcasting signals in |
April 20, 1993 |
| The disclosed antenna is designed notably for the emission of television and radio broadcast signals in the decimetrical wavebands. It comprises:a vertical, central supporting tube,a plurality of identical radiating networks evenly distributed around the central tube, each consisting of a ve |
| 5194835 |
Energy coupling device |
March 16, 1993 |
| Disclosed is an energy coupling device which can be used with metrical and decimetrical waves. To distribute, equipotentially and in equiphase, towards n users, the energy coming from m equipotential sources in equiphase, a 90-degree of 3 dB hybrid circuit is connected at the output |
| 5025207 |
Method for the measurement of a steady level in a noise-infested signal and automatic measuring |
June 18, 1991 |
| The disclosure concerns automatic measuring stands. The automatic measurement of the amplitude of an intermodulation line at the output of a TV transmitter is difficult to achieve because this line is often drowned in a cloud of noise formed by the spectra of lines due to the numerous |
| 4767952 |
High speed control circuit for power field effect transistors |
August 30, 1988 |
| A circuit for high speed control a field effect power transistors. This circuit has a transformer with a primary winding and a secondary winding. The secondary winding transmits control signals to gates of the field effect power transistors. An energy storage structure is coupled to the |
| 4751628 |
Automatic symmetry correction circuit for a symmetrical current chopper |
June 14, 1988 |
| An automatic symmetry correction circuit is provided for a symmetrical current chopper. This structure includes two current channels controlled alternately by two signals of frequency f.A resonant LC circuit is tuned to the frequency f and energized by the currents passing through each o |
| 4672452 |
Device for the automatic precorrection of non-linearities in a power amplification chain for a t |
June 9, 1987 |
| A device for the automatic precorrection of non-linearities of a power amplification chain in a common channel television transmitter. The device has a first circuit for detecting the component to be corrected prior to amplification and addition of the components to be simultaneously |
