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| Number | Title | Issue Date |
| 7376400 | System and method for digital radio receiver A communications system comprising a processor, a variable oscillator, a radio frequency (RF) quadrature demodulator, a variable capacitor, a continuous-time, sigma-delta analog-to-digital converter (ADC), and a frequency divider, all integrated on a single semicond... | 05/20/2008 |
| 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 |
| 7263339 | Tuner comprising a voltage converter The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer associated with an oscillator which is voltage-controlled by said control si... | 08/28/2007 |
| 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 |
| 7209188 | Intermediate-frequency circuit having flat group delay characteristic An intermediate-frequency circuit includes a mixer for converting a received TV signal to an intermediate-frequency signal; an intermediate-frequency amplifier for amplifying the intermediate-frequency signal; an intermediate-frequency tuning circuit for tuning to t... | 04/24/2007 |
| 7155195 | Input and output filtering system for a direct conversion receiver A direct conversion receiver including a filtering system for improving signal reception in the receiver is disclosed. In one embodiment, the direct conversion receiver comprises a first filter adapted to receive a plurality of receive signals comprising a receive b... | 12/26/2006 |
| 7031683 | Apparatus and methods for calibrating signal-processing circuitry A calibration circuitry includes an adjustable capacitor, a voltage generator, a reference voltage generator, and a controller. The reference voltage generator provides a reference voltage. The voltage generator provides a measurement voltage that depends on the cap... | 04/18/2006 |
| 6940358 | Method and apparatus for tuning RF integrated LC filters Using low impedance switches and coupling to a virtual ground, one or more capacitors are selectively switched into or out of an inductive-capacitive resonant circuit portion of an integrated circuit filter to alter the resonant frequency based on a phase difference... | 09/06/2005 |
| 6747522 | Digitally controlled crystal oscillator with integrated coarse and fine control A method of tuning a DCXO includes the step of providing a coarse tuning array and a fine tuning array of capacitors fabricated on the same integrated circuit die. The coarse array is adjusted until the difference between a desired frequency and the output frequency... | 06/08/2004 |
| 6181218 | High-linearity, low-spread variable capacitance array The invention provides a unique apparatus and method which varies the capacitance coupled to a circuit. In one embodiment, the variable capacitance comprises a unique variable capacitance array with multiple capacitance modules which can be selectively en... | 01/30/2001 |
| 5797086 | Method for tuning channels in a voltage synthesizer tuning circuit A method for tuning to channels in a voltage synthesizer tuning circuit. Pulse width modulation data corresponding to an average error value of a variable capacitance diode is set to cope with an error of a tuning voltage varying with an error of the vari... | 08/18/1998 |
| 5732111 | Frequency error compensation for direct sequence spread spectrum systems A frequency error calibration, estimation and compensation device and method for direct sequence spread spectrum systems, such as digital cordless telephones having a handset and a base station. Initial frequency calibration occurs when the handset is phy... | 03/24/1998 |
| 5678211 | Television tuning apparatus The invention concerns an arrangement including a microprocessor controller, PROM memory, and a digital to analog converter (DAC) arrangement for generating a plurality of control voltages for trimming respective ones of a plurality of varactor controlled... | 10/14/1997 |
| 5564100 | Frequency modulator having a modulation varactor coupled to output of a VCO A frequency modulator (100) is provided which includes a VCO (200) having a modulation varactor (122) coupled to its output (128). The VCO (200) includes a resonator stage (112) coupled to an amplifier stage comprising a transistor (118). Coupling of the ... | 10/08/1996 |
| 5535443 | Negative feedback control circuit having a common line for input and output signal A television receiver having an electronically controlled tuner is presented. A controlled local oscillator provides a local oscillator signal for the mixer. The controlled local oscillator includes an first input terminal for receiving a control signal f... | 07/09/1996 |
| 5493715 | Multi-range voltage controlled resonant circuit A voltage controlled tunable resonant circuit (100) has at least two resonant frequency ranges and reduced self modulation, and includes a resonant element (120), a variable reactance element (130), and a first voltage variable capacitor (VVC) (150). The ... | 02/20/1996 |
| 5349700 | Antenna tuning system for operation over a predetermined frequency range A tunable antenna system operates over a predetermined frequency range with an antenna having a length and width each significantly less than a quarter wavelength within the predetermined frequency range. A controllable reactive element is coupled to the ... | 09/20/1994 |
| 5020146 | Lossy constant bandwidth tuned circuit An amplifier loaded with a constant bandwidth tuned circuit is provided with an output series coil, and with a resistance in series with the output coil and a subsequent load to provide attenuation at high frequencies for maintaining the total overall gai... | 05/28/1991 |
| 4996599 | Television tuner oscillator with three point tracking The present invention concerns apparatus for changing the effective tuning inductance with a change of frequency of a multi-band oscillator, said frequency being controlled in response to the magnitude of a tuning voltage for tuned signal amplifiers so th... | 02/26/1991 |
| 4835608 | Image trap filter circuit A varactor diode tuner includes a tunable image frequency trap in its input circuit. The trap is part of a tunable bandpass filter and forms a tapped capacitance matching network for UHF television signal carrier frequencies and a low impedance shunt at i... | 05/30/1989 |
| 4361909 | Pre-tuner tracking traps responsive to a tuning voltage In a television receiver, two tunable traps are incorporated between the RF input and the tuner to attenuate undesired signals symmetrically located in frequency below and above respective desired RF carriers. In one embodiment, the tunable traps are resp... | 11/30/1982 |
| 4205274 | Power amplifier circuit A power amplifier circuit is mainly composed of an amplifier including an input transistor, a driving transistor and a power amplifying transistor. This power amplifying transistor is connected at its output end to an output transformer the secondary wind... | 05/27/1980 |
