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| Number | Title | Issue Date |
| 7928807 | Frequency synthesizer architecture for multi-band ultra-wideband system The present invention provides a frequency synthesizer for a wireless communication system. The synthesizer includes an oscillator that generates an electronic signal as well as frequency dividers, frequency selectors and mixers. The signal generated by the oscillat... | 04/19/2011 |
| 7545224 | Cost effective low noise single loop synthesizer A low cost, low phase noise microwave synthesizer includes a DDS modulation circuit and a phase-locked loop. The DDS modulation circuit modulates the output of a DDS to a high frequency. The phase-locked loop downconverts the DDS output and locks the downconverted s... | 06/09/2009 |
| 7277683 | Regenerative divider for up and down conversion of radio frequency (RF) signals The present invention relates generally to communications, and more specifically to a method and apparatus for generating local oscillator signals used for up- and down-conversion of RF (radio frequency) signals. A major problem in the design of modulators and demod... | 10/02/2007 |
| 7251465 | Method and apparatus for producing mobile radio signals A method and device are provided for producing mobile radio signals, which utilize a direct conversion receiver, at least one first and one second local oscillator and one regenerative divider for processing signals according to different mobile radio standards. For... | 07/31/2007 |
| 7130599 | Quadrature generator with image reject mixer In an exemplary application, an apparatus according to a disclosed embodiment receives a radio frequency signal and outputs an intermediate frequency signal. Rejection of image components in the intermediate frequency signal is obtained without the need to preproces... | 10/31/2006 |
| 7130603 | Radio equipment communicatable in two frequency bands and method for generating local oscillator signal in radio equipment Radio equipment enabling radio communication with frequency conversion corresponding to signals of different frequency bands is disclosed. A local oscillator signal generator included in this radio equipment having a first signal generator, a second signal generator... | 10/31/2006 |
| 7005925 | Low noise synthesizer and method employing first tunable source and first and second reference sources A low noise sinusoidal signal at a desired output frequency is synchronised using a first variable frequency oscillator (1) and providing a feedback control loop around the first oscillator (1) to generate a feedback control signal in successive frequ ... | 02/28/2006 |
| 6725463 | Dual mode tuner for co-existing digital and analog television signals A dual mode tuner/receiver is disclosed in which both analog and digital signals can be received and processed. A low pass filter allows all channels below a selected frequency enter the circuit. A precisely controlled dual conversion circuit creates an intermediate... | 04/20/2004 |
| 6366146 | Phase-locked loop based clock phasing implementing a virtual delay The invention relates to reference handover in clock signal generation systems and similar applications. The idea according to the invention is to introduce a so-called "virtual" delay in the control loop of a PLL for the purpose of forcing the control lo... | 04/02/2002 |
| 6198354 | System for limiting if variation in phase locked loops An apparatus for limiting intermediate frequency variation in a multiple conversion phase locked loop includes a reference oscillator and a voltage controlled oscillator (VCO). The reference oscillator generates a first reference frequency, while the VCO ... | 03/06/2001 |
| 5812591 | Dual conversion GPS frequency converter and frequency plan for same A GPS frequency converter is provided, according to the present invention, to down-convert the frequency of an incoming GPS signal. The converter includes first and second mixers, the former of which receives the incoming RF signal and a signal from a loc... | 09/22/1998 |
| 5717730 | Multiple monolithic phase locked loops A monolithic device is shown having a number of phase locked loops (PLLs) constructed thereon. At least one of the PLLs is constructed as a multiple loop having an output of one PLL loop tied back to the feedback path of the other loop of the pair. In thi... | 02/10/1998 |
| 5642039 | Handheld vector network analyzer A handheld vector network analyzer (VNA) providing a wide bandwidth test signal FO utilizing a narrowband test signal synthesizer which provides the test signal through a frequency divider or harmonic generator. With a 550-1100 MHz narrowband t... | 06/24/1997 |
| 5603097 | Digital radio system capable of high-speed frequency changing at low power consumption The output frequency of a PLL frequency synthesizer and the output frequency of a fixed oscillator are mixed together in a mixer to produce sum and difference frequencies. The sum frequency is used as a local frequency, and the difference frequency is fed... | 02/11/1997 |
| 5455541 | Frequency synthesizer having a frequency generator with N multipliers A frequency synthesizer device which comprises a combination of: an oscillator, a phase comparator, a frequency generator having an input receiving the reference frequency of value OF and N outputs, with N being a whole number between 1 and N, each output... | 10/03/1995 |
| 5260671 | Receiving circuit for demodulating an angle modulated signal A receiving circuit is designed for an MSK (Minimum Shift Keying) receiver and a QPSK (Quadrature Phase Shift Keying) receiver. The circuit provides a synchronous state determining device and a control voltage sweeping device for sweeping the output of a ... | 11/09/1993 |
| 5108334 | Dual down conversion GPS receiver with single local oscillator An antenna is employed to receive a (1540 f0) L1 GPS-satellite signal. In addition, a filter, an (RF) amplifier, a harmonic mixer, and a (sole) local oscillator are employed, the combination configured to mix the seventh harmonic of a 192 f0 local oscilla... | 04/28/1992 |
| 5107272 | Radar system employing injection locked transmitter stage A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source transmit frequency. This alignment is maintained by allowi... | 04/21/1992 |
| 4856085 | FM receiver with improved adjacent-channel rejection An FM receiver having a phase-locked loop demodulator and a control voltage correction circuit for the local tuning oscillator. The correction circuit includes a comparator for comparing the output frequency of the phase-locked loop demodulator with the o... | 08/08/1989 |
| 4839603 | Multiple-loop microwave frequency synthesizer using two phase lockloops A multiple-loop microwave frequency synthesizer is provided with an upper and a lower phased-lock loop. The phased-lock loops are mutually connected to a novel sampling mixer and their outputs are connected to an up-converter for providing microwave frequ... | 06/13/1989 |
| 4823399 | Refined tuning of RF receiver with frequency-locked loop In an RF receiver having a phase-locked loop demodulator and FLL tuning in its RF converter, the frequency of the VCO output signal in the phase-locked loop (PLL) demodulator is controlled indirectly by the FLL in the RF converter in response to a measure... | 04/18/1989 |
| 4742566 | AM receiver AM receiver comprising a tuning oscillator (T0), a first phase detector (PD1) and a first loop filter (LP1) successively arranged in a first phase control loop. The tuning oscillator (T0) is synchronized with a reference oscillator (VCX0) coupled to the f... | 05/03/1988 |
| 4696056 | Frequency converting circuit A frequency converting circuit converts an input frequency into a desired frequency. To obtain the desired frequency, a first frequency converter converts the input frequency, by using an output frequency of a first local oscillator, into an intermediate ... | 09/22/1987 |
| 4673891 | Frequency synthesizer having first phase locked loop frequency multiplied by near unity in second phase locked loop A Frequency synthesis stage comprises two phase locked loops. The first (O1, D1, M, CP1, D2) divides the frequency Fo+Ɗ derived from preceding stages by N/Q, N being a variable integer, and adds to the result a... | 06/16/1987 |
| 4631499 | Phase-locked loop for a directly mixing synchronous AM-receiver A phase-locked loop is constituted by a controllable oscillator coupled through a phase detection arrangement and a low-pass filter to receive an input carrier applied to a signal input of the phase detection arrangement. In order to decrease the phase sy... | 12/23/1986 |
| 4626787 | Application of the phaselock loop to frequency synthesis A frequency synthesizer is disclosed having n identical digital module stages, each of which stages generates one digit of the final frequency number of the synthesized frequency output signal. Each digit module stage comprises a series arrangement of a p... | 12/02/1986 |
| 4603304 | Reference frequency generation for split-comb frequency synthesizer A frequency synthesizing apparatus of the closed-loop design employing a first frequency mixing means to provide a continuous constant increment frequency coverage over a given output signal frequency range. The first frequency mixing means is responsive ... | 07/29/1986 |
| 4521916 | Frequency synthesis tuning control system for a double-conversion tuner The tuning control system of a double-conversion tuner includes a phase locked loop type of frequency synthesizer for controlling the frequency of a controllable oscillator comprising the first local oscillator of the double-conversion tuner according to ... | 06/04/1985 |
| 4518929 | Frequency synthesizer having overtone crystal oscillator A frequency synthesizer which is capable of providing very high output frequencies of the order of 500 MHz is designed to produce a very pure signal having very low noise. An overtone crystal oscillator which is constrained to oscillate at a harmonic freq... | 05/21/1985 |
| 4475088 | Gain imbalance corrected quadrature phase detector Quadrature detectors are subject to errors due to both phase and amplitude mismatches. The disclosed invention comprises a system for sampling the I and Q channel output signals of a quadrature detector and processing these signals to generate a signal wh... | 10/02/1984 |
| 4464638 | Universal digital frequency synthesizer using single side band techniques An improvement in a digital frequency synthesizer comprising a voltage-controlled oscillator (VCO) for producing a signal SVCO having a frequency fVCO, a first signal generator for generating a plurality of signals SAS hav... | 08/07/1984 |
| 4394626 | Phase synchronizing circuit A phase synchronizing circuit, wherein two phase detectors are used in quadrature to detect the phase of an input signal and to avoid hang-up when the phase of the input signal changes abruptly by 180°. The two detected phase signals are then multiplied ... | 07/19/1983 |
| 4368437 | Wide frequency range signal generator including plural phase locked loops A wide band oscillator with phase lock loop is controlled by signals from an 40 MHz harmonics generator combined with the output of another phase lock loop controlled oscillator whose selectible outputs vary in MHz steps with a total range of 39 MHz. The ... | 01/11/1983 |
| 4340974 | Local oscillator frequency drift compensation circuit The invention provides a double superheterodyne receiver having the usual first and second frequency changers associated with first and second local oscillators. The second local oscillator is provided as a voltage controlled oscillator and means are prov... | 07/20/1982 |
| 4339826 | Radio receiver having phase locked loop frequency synthesizer A radio receiver comprises a frequency conversion circuit connected between a frequency-variable local oscillator and a divide-by-N programmable counter incorporated in a phase locked loop frequency synthesizer and adapted to continuously change the frequ... | 07/13/1982 |
| 4303893 | Frequency synthesizer incorporating digital frequency translator The use of a digital frequency translator, using pulse snatching techniques, for multiplying the output frequency of a precise and accurate frequency synthesizer by a preselected certain numerical fraction permits the frequency synthesizer to be referred ... | 12/01/1981 |
| 4272730 | Microwave frequency synthesizer utilizing a combination of a phase locked loop and frequency translation techniques A microwave frequency synthesizer utilizing a phase locked loop for generating a wide range of microwave frequencies in response to a control signal, in combination with a network including a plurality of distinct frequency local oscillators that are appr... | 06/09/1981 |
| 4259644 | Local oscillator for multi-band reception having single crystal reference oscillator A local oscillator having a variable frequency oscillator and a carrier frequency oscillator for use in communication systems that transmit and/or receive signals on multiple frequency bands, one crystal reference oscillator; a converter circuit for mixin... | 03/31/1981 |
| 4246546 | Apparatus and method for locking a PLL onto a selected offset frequency sideband The output of a VCO, a referenced frequency signal and an offset frequency signal are mixed to provide a control signal for the VCO and a double offset frequency signal which is mixed with an output of the offset frequency source to provide a DC component... | 01/20/1981 |
| 4198604 | Heterodyne phase lock system A heterodyne phase lock system is disclosed having a plurality of oscillator circuits, a similar plurality of heterodyne (mixer-filter) circuits representing an input circuit, and a similar plurality of heterodyne circuits representing a control circuit, ... | 04/15/1980 |
