Rfstream Corporation

Rohm Co., Ltd.

Ukom, Inc.

Kimitake Utsunomiya

Takatsugu Kamata

Yoshihiro Ikefuji

Akihiro Okui

In a non-contact power feeding system which is formed with a power transmission device having a power transmission-side resonant circuit including a power transmission-side coil and a power reception device having a power reception-side resonant circuit including a power reception-side coil and which can transmit and receive power by a magnetic field resonance method, when the power is transmitted, the power transmission device monitors the amplitude of a current flowing through the power transmission-side coil. Then, when a current amplitude detection value (V) falls outside a predetermined normal range, it is determined that a foreign object is present, and thus the power transmission is stopped.

Power transmission device non-contact power feeding system with detection circuit to detect current amplitude in transmission-side coil

A television tuner is fully implemented on a monolithic integrated circuit. The television tuner includes a baseband SAWF function fully integrated in silicon. The SAWF function includes trap and bandpass filters. A video demodulation circuit includes an I, Q demodulation and a post Nyquist filter.

Quadratic video demodulation with baseband nyquist filter

A monolithic integrated circuit includes a tuner and a SAW filter function. The tuner receives a radio frequency (RF) television signal that has a range of fundamental frequencies from 55 mega hertz (Mhz) to 880 Mhz. The tuner down converts the RF television signal to an intermediate frequency (IF) television signal that has a low fundamental frequency. In one embodiment, the SAWF filter performs the SAW filter function on the IF television signal. In another embodiment, the SAWF filter performs the SAW filter function at baseband. An IF processor for processing the IF television signal to generate a video television signal and an audio television signal is disclosed.

Methods and apparatus for implementing a receiver on a monolithic integrated circuit

A television demodulator circuit, for use in a television receiver, generates baseband video and audio outputs from a television signal, such as an intermediate frequency television signal. The I, Q demodulator circuit mixes the television signal with an in-phase ('I') local oscillator signal and a quadrature phase ('Q') local oscillator signal at the tuned frequency to generate baseband I and Q signals. The baseband I and Q signals are input to low pass filters and a Nyquist slope filter. The Nyquist slope filter generates, for the baseband I and Q signals, a Nyquist slope response and attenuates channels adjacent to the tuned television channel. The Nyquist slope filter comprises a transfer function with at least two zero crossings, so as to provide a notch filter response for attenuation of a television channel adjacent to the tuned television channel. For example, the transfer function may have three zero crossings to attenuate a sound carrier frequency, a color carrier frequency, and a picture frequency for the television channel adjacent to the tuned television channel. The transfer function, expressed in the S domain, comprises an all-pass fractional transfer function with a real number in the numerator and a complex number in the denominator. A television receiver that incorporates the I, Q demodulator circuit is disclosed.

Quadratic nyquist slope filter

An image rejection quadratic filter is tunable to filter image frequencies over a wide band. In one embodiment, the image rejection filter includes in-phase and quadrature phase mixers. The image rejection has a fractional transfer function. The image rejection filter has two sub-circuits, wherein the first sub-circuit produces the imaginary component of the transfer function, and the second sub-circuit produces the real component of the transfer function. The first sub-circuit receives the Q signal, and the second sub-circuit receives the I signal. In one embodiment, to create the fractional transfer function, a multi-feedback looped integrator is used.

Image rejection quadratic filter

An inductive ('L')-capacitive ('C') filter bank has application for use in a television receiver. The LC filter includes inductors configured in at least one inductive (&#x201c;L&#x201d;) bank, and capacitors configured in at least one capacitive (&#x201c;C&#x201d;) bank. The inductors and capacitors are selectively enabled so as to configure an LC filter with at least one inductor from the L bank and at least one capacitor from the C bank. A combination of inductors and capacitors are selected through the semiconductor switches so as to maximize a Q factor for the LC filter.

Frequency discrete LC filter bank

A receiver, such as a television receiver, tunes an inductive (&ldquo;L&rdquo;) and capacitive (&ldquo;C&rdquo;) filter based on a desired frequency. The LC filter includes a plurality of inductors, configured in at least one inductive (&ldquo;L&rdquo;) bank, and a plurality of capacitors configured in at least one capacitive (&ldquo;C&rdquo;) bank. The inductors are selectively enabled for the LC filter by an N code, and the capacitors are selectively enabled for the LC filter by an M code. The receiver uses a functional comparator to compare offset, capacitive, inductive and frequency values to tune the LC filter. Techniques for tuning the LC filter for operation in the VHF and UHF bands are disclosed.

Growing community of inventors

Sunnyvale, CA, United States of America

Kimitake Utsunomiya