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| Number | Title | Issue Date |
| 7342467 | Variable power coupling device An apparatus and method for providing adaptive control of the output of a radio frequency coupler. A plurality of input signals is provided to a multi-prong divider/combiner, the divider/combiner having a first and a second input terminals communicating a first and ... | 03/11/2008 |
| 7282982 | Mixer-system with gain-blocks and switches Mixer-systems comprising gain-blocks (1-4) and switches (5-8) have a flexibility depending upon their configuration (insight) and are made more flexible (basic idea) by supplying data input signals to the gain-blocks (1-4) a... | 10/16/2007 |
| 7257497 | Sequential frequency band acquisition apparatus for test and measurement instruments An acquisition apparatus for a test and measurement instrument includes an input to receive an input signal, a digitizer to digitize a selected signal, a bypass path to selectively couple the input to the digitizer, a frequency shift path to frequency shift the inpu... | 08/14/2007 |
| 7245655 | Dual antenna receiver Structures and techniques for implementing multiple-antenna configurations within a radio frequency receiver are provided. In one aspect, a modularized multi-antenna receiver is provided having multiple independent microelectronic dice mounted on a common module sub... | 07/17/2007 |
| 7095274 | System for demodulation of phase shift keying signals The invention particularly relates to a system for demodulation of PSK signals which takes advantage from the effects that the locking of resonant circuits by superharmonic injection produce, together with the interference phenomena, and more particularly it relates... | 08/22/2006 |
| 7012343 | Resistance multiplier circuit and compact gain attenuator A resistance multiplier circuit coupled to a first node of a first circuit for providing a high-value resistance at the first node includes a first transistor, a second transistor being N times larger than the first transistor, and a resistor. In one embodiment, the... | 03/14/2006 |
| 6975165 | Method and system for the conversion of phase shift keying signals (PSK) into amplitude shift keying signals (ASK) A system for the conversion of digital phase shift keying (PSK) signals into digital amplitude shift keying (ASK) signals. The system consists of a power divider, PDIV, with an input, into which a PSK signal at a frequency of 2f is injected, where f is... | 12/13/2005 |
| 6839389 | Digital quadrature demodulation and decimation without multipliers One embodiment of the present invention includes a gating circuit, a demultiplexer, and an integrator. The gating circuit gates an input sample with a first clock, the input sample being clocked by a sampling clock N times faster than the first clock. The demultiple... | 01/04/2005 |
| 6466086 | Quadrature demodulator with phase-locked loop A quadrature demodulator applicable to digital communication and digital broadcast is provided, which simplifies the circuit configuration of a quadrature demodulator section and which reduces the labor or man-hours and the time required for adjusting the... | 10/15/2002 |
| 6341146 | Phase-shift-keying demodulator and demodulation method using a period-width windowing technique A demodulator demodulates a PSK communications signal using a synchronizer, a period window detector, and a logic device. The synchronizer provides a transition signal representing reference edges of the communication signal. The period window detector, c... | 01/22/2002 |
| 5790032 | Method of and apparatus for detecting living bodies An apparatus detects living bodies, in particular human living bodies, by ectromagnetic signals. The apparatus has a receiver device for electromagnetic signals that includes a device for obtaining frequency components that are characteristic in respect t... | 08/04/1998 |
| 5790600 | Method of compensating differences in group propagation times between the analog filters of a transmitter and between those of a receiver for signals in phase quadrature corresponding compensation apparatus and a corresponding transmission system The invention relates in particular to a method of compensating differences in group propagation times between first and second analog filters of a transmitter of signals in phase quadrature, and between third and fourth analog filters of a receiver of si... | 08/04/1998 |
| 5734295 | Quadrature demodulator having active filters formed with emitter follower output stages The invention provides a quadrature demodulator which removes unnecessary higher harmonic signals included in a demodulation output without giving rise to increase in number of externally connected parts and increase in current consumption. The quadrature... | 03/31/1998 |
| 5521938 | Apparatus for performing frequency conversion in a communication system An efficient apparatus for performing frequency conversion from a final IF frequency to a baseband frequency is described. A counter (401) generates two logical signals G1 (402) and G2 (403) which are passed to an exclusive-OR gate (404) and a multiplexer... | 05/28/1996 |
| 5473280 | Modulation/demodulation method and system for realizing quadrature modulation/demodulation technique used in digital mobile radio system with complex signal processing In a complex modulation/demodulation method and system, the data frequency fC1 of data signals I and Q inputted to a constellation mapping circuit is converted by a digital interpolation circuit into a sampling frequency fC2 equal to... | 12/05/1995 |
| 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 |
| 5412351 | Quadrature local oscillator network A compact local oscillator network for use in a quadrature modulator and/or demodulator is presented. Single side band circuitry is configured to produce quadrature signals with a high degree of accuracy such that two equal amplitude signals are generated... | 05/02/1995 |
| 5311151 | I/Q modulator and demodulator having a single bridge An IQ modulator/demodulator wherein the 90° phase quadrature branches of an input signal are connected to different terminals of a common bridge, from which also the quivalents I and Q signals are obtained. To the bridge is also connected a local oscilla... | 05/10/1994 |
| 5307021 | Phase-error detecting circuit for QDPSK demodulator A phase-error detecting circuit for detecting a phase error of an output signal of the VCO in a QDPSK demodulating circuit in accordance with the Costas loop method is disclosed. The phase-error detecting circuit comprises a first circuit which generates ... | 04/26/1994 |
| 5122765 | Direct microwave modulation and demodulation device A microwave circuit intended for either direct modulation or direct demodulation of a microwave link communications signal is characterized in that a local oscillator (8) is incorporated in the circuit. The local oscillator supplies two signals that are i... | 06/16/1992 |
| 5014316 | Compatible quadrature amplitude modulation detector system An audio detector circuit forms L+R and L-R audio signals from an intermediate frequency compatible quadrature amplitude modulated signal in the form (1+L+R)cos(fct+$c;) where $c; contains phase modulated L+R and L-R signals. An envelope detector ge... | 05/07/1991 |
| 5001723 | Sinusoidal M-ary orthogonal keyed decoding A spread spectrum communications system is described for recovering data from a signal having a first carrier frequency modulated by one of at least four phase modulations, each phase modulation orthogonal to one another and the signal further modulated b... | 03/19/1991 |
| 4870382 | High frequency lock detecting circuit The present invention provides a high frequency lock detecting circuit for generating a signal indicative of a locked or a not locked phase tracking condition in a phase locked loop circuit. The lock detector comprises a plurality of high speed function g... | 09/26/1989 |
| 4628272 | Tuned inductorless active phase shift demodulator An inductorless quadrature demodulator for frequency modulated signals is disclosed. A limited FM signal is passed through an active filter (26) and a phase shift network (30) to produce a quadrature signal. The limited FM signal is compared with the quad... | 12/09/1986 |
| 4594555 | Frequency selective sampling detector A signal receiver having a frequency selective sampling detector which accepts a bandlimited analog signal and outputs uniformly spaced, digital samples of the signal's quadrature and in-phase components. The center frequency, phase reference and sample i... | 06/10/1986 |
| 4484143 | CCD Demodulator circuit A semiconductor integrated circuit using charged coupled device (CCD) technology for performing demodulation of time-varying signals which have been phase or amplitude modulated. The CCD circuit performs a sampling of the time-varying signal at a suitable... | 11/20/1984 |
| 4471313 | Demodulator for phase difference demodulated signals In a demodulator for demodulating a phase difference modulated microwave frequency signal, which demodulator includes a time delay element, a phase shifting unit connected in series with the time delay element, the series arrangement of the time delay ele... | 09/11/1984 |
| 4389615 | CCD Demodulator circuit A semiconductor integrated circuit using charged coupled device (CCD) technology for performing demodulation of time-varying signals which have been phase or amplitude modulated. The CCD circuit performs a sampling of the time-varying signal at a suitable... | 06/21/1983 |
| 4377728 | Phase locked loop with improved lock-in The circuit determines whether an incoming frequency is within the normal "lock-in" range of a phase locked loop VCO or not, and whether it is higher or lower than the VCO frequency. If not within normal range, the beats are rectified and gated to provide... | 03/22/1983 |
| 4361817 | Bi-phase modulator/demodulator A bi-phase modulator/demodulator circuit for converting uni-polar to bi-polar signals. The circuit can be used to bi-phase modulate a continuous wave (CW) input signal or to demodulate a bi-phase coded input signal by use of transistor-transistor logic (T... | 11/30/1982 |
| 4352071 | Planar QPSK demodulator A microwave integrated circuit (MIC) quadrature phase shift keying (QPSK) modulator uses a novel arrangement of couplers to permit the IF ports to be adjacent one another so that, in mixer applications, it is unnecessary for the circuitry to leave the pla... | 09/28/1982 |
| 4281293 | Planar QPSK demodulator A microwave integrated circuit (MIC) quadrature phase shift keying (QPSK) demodulator uses a novel arrangement of couplers to permit the IF ports to be adjacent one another so that, in mixer applications, it is unnecessary for the circuitry to leave the p... | 07/28/1981 |
| 4021743 | Phase logic demodulator A demodulator for a biphase or quadriphase shift-keying system. The demodulator includes two AND gates for biphase demodulation. The AND gate is one which will provide an output signal if and only if the two input signals are in phase. Each of the AND gat... | 05/03/1977 |
