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| Number | Title | Issue Date |
| 7388446 | Directly modulated CMOS VCO A variable capacitor modulator for use in a voltage controlled oscillator, includes a differential varactor block, coupling capacitors for connecting nodes of the varactor block to a tank circuit, and an element connected between the respective nodes and ground to t... | 06/17/2008 |
| 7321253 | Multiplier A conventional multiplier which uses a MOS transistor has a subject that, in order to compensate for a variation of a bias voltage or the like, it is necessary to add a complicated correcting circuit to an outputting section or the like, and the circuit scale become... | 01/22/2008 |
| 6545557 | FM signal oscillator circuit and modulation level control method An FM signal oscillator circuit includes a resonator having a graded- or abrupt-junction variable capacitance diode that is producible through standard IC manufacturing processes but causes an inconstant modulation level. The FM signal oscillator circuit,... | 04/08/2003 |
| 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 |
| 5926072 | FM modulator using a monostable multivibrator A frequency modulation circuit includes an emitter-follower connection transistor (2), having a base supplied with a modulation signal, for generating an emitter voltage which is in proportion to a modulation signal level; and an integrated mono-stable mu... | 07/20/1999 |
| 5767752 | Frequency modulator with center frequency and modulation controlled by an input signal A frequency modulator controls the center frequency and modulation factor at the same time with one control signal. The frequency modulator includes a voltage-to-current converter that receives an input voltage signal to be modulated, a reference voltage ... | 06/16/1998 |
| 5731745 | High frequency oscillator circuits operable as frequency modulators and demodulators The high frequency circuit includes an oscillator connected in a Colpitts configuration. Negative feedback to the oscillator is applied through an amplifier, both to stabilize the circuit and to permit frequency modulation of the carrier signal generated ... | 03/24/1998 |
| 5717364 | Mixer A small and inexpensive mixer that does not require a choke inductor and a large-capacitance capacitor. The mixer has a FET. The FET's source is grounded via a capacitor and is also connected to a power-supply terminal. The FET's gate is coupled to a bias... | 02/10/1998 |
| 5654677 | Relaxation oscillator of reduced complexity using CMOS equivalent of a four-layer diode A relaxation oscillator of reduced complexity is described which can be constructed as part of a silicon integrated circuit. The current controlled oscillator includes complementary field effect transistors operating in enhancement mode. The drain of one ... | 08/05/1997 |
| 5585751 | Frequency control circuit of FM modulator A frequency control circuit of an FM modulator with a small number of external parts and a low number of IC pins, including a non-linear D/A converter, a current generator circuit and an emitter-coupled multivibrator. The non-linear D/A converter for givi... | 12/17/1996 |
| 5515014 | Interface between SAW filter and Gilbert cell mixer The invention concerns multipliers used to modulate a carrier by a signal. The signal is delivered by a Surface Acoustic Wave (SAW) filter, which requires a load impedance of low value, in the range of tens of ohms, and almost certainly less than 200 ohms... | 05/07/1996 |
| 5506547 | Frequency modulator having LC oscillator with switchable frequencies A frequency modulation circuit which varies the resonance frequency of an LC resonance circuit, and which corresponds to the frequency modulation conversions of all TV methods with a simple constitution. Each of a plurality of passive element series circu... | 04/09/1996 |
| 5502420 | Cascode VCO frequency modulator A voltage controlled oscillator apparatus for generating a desired frequency, set by a tuning voltage, toward modulating a transmission signal on the desired frequency. The voltage controlled oscillator apparatus includes an oscillator transistor the base... | 03/26/1996 |
| 5498885 | Modulation circuit An integrated circuit is provided with particular application for high frequency modulation circuits, such as a mixer circuit, with reduced noise and gain. The circuit provides a novel application of a single device comprising a 4 or 5 terminal, gate cont... | 03/12/1996 |
| 5428226 | Relativistic semiconductor plasma wave frequency up-converter with energized portion A device that frequency up-shifts an impinging electromagnetic wave, facilitating signal pulse compression, consisting of a semiconductor block or waveguide containing an optically induced relativistic plasma wave which interacts with an applied or self g... | 06/27/1995 |
| 5323024 | Relativistic semiconductor plasma wave frequency up-converter A device that frequency up-shifts an impinging electromagnetic wave, facilitating signal pulse compression, consisting of a semiconductor block or waveguide with an optically-induced relativistic plasma wave which interacts with an applied or self generat... | 06/21/1994 |
| 5198784 | Frequency modulated oscillator having controllable current sources A frequency modulation oscillator circuit includes an oscillator stage having two emitter-coupled transistor pairs, each being fed from at least one controllable current source, and at least one trigger stage for triggering the controllable current source... | 03/30/1993 |
| 5168248 | Ferri-magnetic film frequency modulator For realizing a highly sensitive and favorably linear frequency modulator stably operating with a small-sized and readily manufactured arrangement, input and output strip electrodes are disposed in face on both ends of a ferri-magnetic film deposited on a... | 12/01/1992 |
| 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 |
| 5130674 | Voltage controlled oscilator having controlled bias voltage, AGC and output amplifier A voltage controlled oscillator circuit including an oscillator circuit having first and second terminals to which an external inductance is connected. A frequency control voltage (VF) is applied through a bias circuit to the second terminal fo... | 07/14/1992 |
| 5087897 | Oscillator tunable by varying current in spiral inductor on ferrite substrate An oscillator circuit is tunable by a tuning circuit which includes a spiral inductor disposed on a ferrite substrate. The oscillator circuit is tuned or modulated by varying a current through the spiral inductor.... | 02/11/1992 |
| 5075643 | Frequency modulator An improved frequency modulation apparatus (100) is provided comprising a generator (102), a biasing voltage line (116), and an interface circuit (110). The generator (102) is utilized to generate a carrier signal. A control line input (104) on the genera... | 12/24/1991 |
| 5045818 | PLL frequency modulator having bias voltage applied to filter capacitor A frequency modulation circuit includes a VCO which constitutes a PLL along with a loop filter which is operated by a current source. Such a frequency modulation circuit is formed in monolithic IC. When a power source of the IC is turned-on, a capacitor i... | 09/03/1991 |
| 4988960 | FM demodulation device and FM modulation device employing a CMOS signal delay device A signal delay device comprises a CMOS gate circuit having an input terminal to which a binary input signal to be delayed is applied, an output terminal from which a delayed signal is derived and power voltage supply terminals to which operation power vol... | 01/29/1991 |
| 4959625 | Wide bond balanced output frequency modulator using a video signal as a modulation signal A frequency modulator is provided, in which, for instance, a video signal is used as a modulation signal. A differential amplifier is formed by first and second transistors. First and second load resistors are connected between respective collectors of th... | 09/25/1990 |
| 4675618 | Linearizer circuit for frequency modulation oscillator A system for frequency modulation by a signal, the system including an oscillator having a known linearity distortion, a circuit for selecting one from a plurality of predetermined constants, a circuit for operating on the signal with the selected constan... | 06/23/1987 |
| 4635296 | Wide bandwidth ultra high stability FM telemetry transmitter An FM transmitter especially for physiological signal telemetry includes a transistor oscillator having a collector-to-base capacitance that is part of its tuned circuit. Means are disclosed for controllably varying the collector-to-base capacitance only ... | 01/06/1987 |
| 4631502 | Transistor modulator for converting video game signals into antenna input signals for a television receiver A transistor modulator for use in a circuit for processing video and sound signals of a video game so as to produce a composite output signal for application to the antenna input of a television receiver to produce a display of such video game. The modula... | 12/23/1986 |
| 4602224 | Variable capacitance reactance circuit A circuit having an effective output capacitance the value of which can be varied over a predetermined range of values includes first and second differential amplifiers. The differential inputs of the second differential amplifier are connected to the dif... | 07/22/1986 |
| 4584542 | Frequency modulator having parallel-connected phase adder and oscillator amplification elements A frequency modulator comprises an oscillator circuit, and a phase adder circuit receiving a signal derived by phase-shifting an oscillation output of the oscillator circuit by 90° and multiplying the phase-shifted signal by a modulating signal, and addi... | 04/22/1986 |
| 4571557 | Wide band transistor oscillator An oscillator includes two transistors or like devices having their emitters connected to a common of a power source. The two transistors or like devices are interconnected with the base of the first connected to the collector of the second and the base o... | 02/18/1986 |
| 4565978 | Integrable oscillator circuit An integrable bipolar oscillator circuit, includes four transistors of the same conductivity type, four resistors, three constant current sources having base points and outputs, a reference potential terminal connected to the base points of each of the co... | 01/21/1986 |
| 4533882 | Frequency modulator wherein modulation takes place in a feedback loop of an oscillator A frequency modulator comprises an oscillator circuit, a phase shift circuit for phase-shifting an oscillation output of said oscillator circuit by 90 degrees, a multiplier circuit for multiplying an output of the phase shift circuit by a modulating signa... | 08/06/1985 |
| 4481546 | Modulator-demodulator for obtaining and demodulating frequency-modulated signal A modulator-demodulator suited to record an audio signal in a recording medium in the form of a frequency-modulated signal and to demodulate the frequency-modulated signal is disclosed. It includes a voltage-controlled oscillator, a switching circuit for ... | 11/06/1984 |
| 4475244 | Time-period modulation transmission system A system for time-period modulating (TPM) a subcarrier in accordance with the amplitude of an input signal includes generating a ramp signal of constant slope, comparing the ramp signal with the input signal, and resetting the ramp signal when the ramp si... | 10/02/1984 |
| 4303894 | FM Modulator using variable transistor capacitance In an FM modulation circuit, a variable capacitance circuit employs a transistor as a variable capacitance element. The transistor has resistors connected between the emitter and base thereof and between the collector and base thereof, respectively, and i... | 12/01/1981 |
| 4091342 | Time delay modulator A time delay modulator is disclosed in which the instantaneous time base of a carrier signal is varied in accordance with a modulating signal. In one embodiment, modulation is achieved through the use of charge transfer delay lines and variable frequency ... | 05/23/1978 |
| 4059814 | Controllable semiconductor element Controllable semiconductor element with an active semiconductor path controlled by means of conductivity modulation. The structure corresponds to a semiconductor arrangement with applied conductive strips. On the lower side of a semiconductor layer (1), a meta... | 11/22/1977 |
| 4052673 | Combined controlled oscillator and frequency multiplier A voltage controlled oscillator which, for example, may be utilized in a phase locked loop, includes an odd number (n) of cascaded COS-MOS inverter stages with a feedback path coupling the output of the last stage to the input of the first stage to form a... | 10/04/1977 |
| 4021737 | System for processing and transmitting audio signals received from a television set for reproduction by a high fidelity FM receiver An audio signal coupling and processing system utilizes the electronics and speakers of a high fidelity system for reproduction of TV audio without direct connection between the television set and the high fidelity system. Partially processed FM signals o... | 05/03/1977 |
