Class 455/169.2 - With varactor diode

Subclass of Class 455 - Telecommunications
Definition: Subject matter wherein the particular variable voltage or
No. of patents: 22
Last issue date: 06/10/2008

Number	Title	Issue Date
7386065	Voltage controlled oscillator (VCO) suitable for use in frequency shift keying (FSK) system A voltage controlled oscillator (VCO), suitable for use in a frequency shift keying (FSK) system. The VCO device comprises a switching varactor unit, having a first terminal and a second terminal, wherein the switching varactor unit produces a capacitance, according...	06/10/2008
7295822	Radio wave receiver, radio-controlled timepiece and tuning capacitance setting method A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which determines an optimum capacitance of the variable capacitor with whi...	11/13/2007
7245895	Attenuator with switch function and mobile telephone terminal device using the same A high frequency part, which amplifies a high frequency signal outputted from an intermediate frequency part and supplies to an antenna, is equipped with a gain controller with switch function. The gain controller with switch function comprises an attenuator with sw...	07/17/2007
7095989	Frequency translating devices and frequency translating measurement systems with DC bias added to a mixer diode A frequency translating device (FTD) includes at least one mixer diode connected to down-convert a radio frequency (RF) to an intermediate frequency (IF) and to up-convert an IF to an RF and a source of direct current (DC) bias that is connected to the mixer diode. ...	08/22/2006
6973288	Linearizer for a PIN diode attenuator Linearizer circuitry is disclosed for providing control signal outputs to operate a controllable attenuator throughout a relatively large dynamic range while maintaining a relatively consistent return loss. Preferred embodiment linearizer circuitry provides a series...	12/06/2005
6968220	RF receiver with power off control An RF receiver or another type of electronic circuit contains circuit elements a setting of which is controlled by at least one control voltage. Furthermore, a control unit is provided for switching off the circuit elements during power-off periods. While the circui...	11/22/2005
4580285	Scanning AM radio with discriminator-driven-scan-stop-circuit An integrated circuit AM radio receiver includes a scan-tuner comprised of a frequency synthesizer with micro-processor controller. The tuner stops scanning when an AGC derived signal increases beyond a predetermined level indicating a strong station and ...	04/01/1986
4466126	Tuner apparatus A television tuner comprises a tuning circuit including a voltage controlled variable capacitance diode. The tuning circuit is housed within a shield casing. The shield casing is provided with a terminal for electrical connection to the variable capacitan...	08/14/1984
4264976	Tuning control apparatus for digital tuner A tuning control apparatus for a digital automatic scanning tuner or a digital preset tuner employing a voltage controlled variable capacitance diode as a tuning element, wherein a tuning state detecting circuit is provided for detecting a tuning state re...	04/28/1981
4253195	FM-Receiver comprising a search tuning system FM-receiver comprising a search tuning arrangement, a control device for making the search tuning arrangement operative, a frequency discriminator and a stop-pulse generator having a threshold and being connected to an output of the frequency discriminato...	02/24/1981
4053838	Radio receiver The tuning circuit of an automatically tuned radio receiver comprises a semiconductor variable capacitance element and is supplied with control voltage from a voltage memory element. The voltage memory element is controlled in the polarity of input voltag...	10/11/1977
4041399	Semiconductor varactor device and electronic tuner using same A varactor device comprised of plural varactor elements disposed in a semiconductor body, each varactor element includes first and second semiconductor regions defining a PN junction therebetween. Any two of the varactor elements in the semiconductor body...	08/09/1977
4011514	Memory circuit for tuning of an electronically tuned receiver to a preselected station A circuit for storing of tuning-in to preselected stations for receivers provided with electronic tuning, in which the voltage supplied from a charged capacitor onto variable reactance elements, such as capacitance diodes, included in tuned resonant circu...	03/08/1977
4011515	Tunable scanning radio receiver A scanning radio receiver that is electronically tuned for station selectivity over a given band of frequencies. Varactor diodes contained in the RF and local oscillator stages of the scanning receiver circuitry are voltage controlled to select a finite n...	03/08/1977
4009438	Superheterodyne receiver with a digitally adjustable tuning arrangement The invention provides a superheterodyne receiver having a digitally adjustable tuning arrangement which permits wide adjustable frequency ranges and in which nearly no deviation from the adjusted frequency occurs over the entire adjustable frequency rang...	02/22/1977
3996540	Indicating device for tuning apparatus An apparatus for indicating a tuned frequency of a tuner of a radio or television receiver, said tuner comprising a tank circuit employing a voltage controlled variable capacitance diode as a circuit element, which diode is supplied in a reverse direction...	12/07/1976
3987400	Multiband scanning radio receiver There is disclosed a signal-seeking, scanning superheterodyne radio receiver operable on all four bands comprising the public service radio frequencies. The receiver uses a single oscillator and appropriately controlled frequency multipliers to generate t...	10/19/1976
3986154	Automatic tuning apparatus An automatic tuning apparatus comprising a tuner having a tank circuit employing a voltage controlled variable capacitance diode as a circuit element, which diode is supplied in the reverse direction with a scanning control voltage from a solid state pote...	10/12/1976
3978411	Sweep output generator having a frequency modulated local oscillator for the station selector of a television receiver A sweep output generator in which an a-c voltage of small amplitude is superimposed upon a sweep voltage applied to a variable reactance element of a local sweep voltage controlled oscillator for sweeping the local oscillator frequency and also for freque...	08/31/1976
3967057	Automatic tuning apparatus An automatic tuning apparatus, such as an automatic channel selector as incorporated in a television receiver, comprising a tuner using a voltage controlled variable capacitance diode such that the variable capacitance thereof constitutes a portion of a t...	06/29/1976
3965336	Radio or television receiver with an automatic station finding arrangement In a radio or television receiver containing an automatic station finder with a digital counter, a clock generator, and a digital-to-analog converter forming the tuning voltage for the varactors, a recall memory consisting of two series-connected parallel...	06/22/1976
3961267	Channel selecting control system for television tuner including unused channel skip system In a television receiver, a tuning voltage for a varactor tuner is generated by the actuated stage of a plural step neon lamp memory in which each memory stage corresponds to a different television channel. The memory stages are connected as a ring counte...	06/01/1976

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Class 455/169.2 - With varactor diode