Abstract: An automatic quadrature network with amplitude and phase detection produces quadrature signals for an input oscillator signal, the quadrature signals being equal in amplitude and having ideal quadrature phase between them. An RC circuit provides one quadrature path, and a CR circuit provides another quadrature path. The outputs from the RC/CR circuits are amplitude detected to produce an amplitude control signal. The outputs also are amplitude limited, and the phase between the limiter outputs is detected to produce a phase control signal. The amplitude and phase control signals are combined to generate respective control signals for the RC/CR circuits to automatically align them so that the quadrature signals are of equal amplitude and ideal quadrature phase.

Abstract: An integrated calibrator provides for magnitude and phase response calibration of RF receivers to produce amplitude flatness and phase linearity across the frequency range of the RF receiver by using a simple square law diode detector and a frequency-stepped two-tone source. A two-tone source generator provides two sinusoidal signals separated by a specified frequency delta about a center frequency. The center frequency is stepped across the bandwidth of the RF receiver. At each center frequency the two sinusoidal signals are input to the RF receiver and to the diode detector. The two sinusoidal signals are processed by both the receiver path and the calibrator path, and the results are used by the calibrator to generate coefficients for a correction filter in the receiver path at each of the stepped center frequencies.

Abstract: An automatic quadrature network with amplitude and phase detection produces quadrature signals for an input oscillator signal, the quadrature signals being equal in amplitude and having ideal quadrature phase between them. An RC circuit provides one quadrature path, and a CR circuit provides another quadrature path. The outputs from the RC/CR circuits are amplitude detected to produce an amplitude control signal. The outputs also are amplitude limited, and the phase between the limiter outputs is detected to produce a phase control signal. The amplitude and phase control signals are combined to generate respective control signals for the RC/CR circuits to automatically align them so that the quadrature signals are of equal amplitude and ideal quadrature phase.

Abstract: A radio system includes a radio frequency (RF) integrated circuit (IC), a baseband digital signal processing (DSP) IC, and a serial digital interface coupling data there-between. In one embodiment of the invention, the RF IC has an input receiver to receive a serial digital transmission bit stream from a digital signal processing integrated circuit; a data recoverer coupled to the input receiver to recover digital data bits from the serial digital transmission bit stream; a low pass filter coupled to the data recoverer convert the digital data bits into an analog transmission signal; a mixer coupled to the low pass filter to up-convert the analog transmission signal from a baseband frequency to a second selectable carrier frequency as a transmit radio frequency signal; and an amplifier coupled to the mixer and an antenna, the amplifier to amplify the transmit radio frequency signal for broadcast over the antenna.

Abstract: An interactive control system for an image display device includes a case with an opening, a luminous source image display, a focusing element, and an interactive device. The luminous source image display displays a first image and the source image display is positioned within the case. The focusing element receives light and focuses the light to form a second image that is viewable through the opening, and the focusing element is positioned within the case. The interactive device controls the behavior of the system in response of input from a user. The interactive device includes a sensor system which detects a motion of the user. The focusing element includes a concave mirror with a black coating on the reflecting surface. The sensor system detects three-dimensionally a location and motion of a given object in a space in the opening of the case in front of the focusing element.

Abstract: An olfactory advertising system combined with image display device includes a case, a luminous source image display displaying a first image, a focusing element receiving light from the source image display and focusing the light to form a second image that is viewable through the opening of the case, an interactive devices for controlling the behavior of the system, and a scent generating device. The scent generating device releases a predetermined scent according to the electronic signal from the interactive devices. The focusing element includes a concave mirror with a black coating on the reflecting surface. The scent generating device comprises a sensor system, and the sensor system detects a motion in a sensitive space in the opening of the case in front of the focusing element and produces an electronic signal.

Abstract: A radio system includes a radio frequency (RF) integrated circuit (IC), a baseband digital signal processing (DSP) IC, and a serial digital interface coupling data there-between. In one embodiment of the invention, the RF IC has an input receiver to receive a serial digital transmission bit stream from a digital signal processing integrated circuit; a data recoverer coupled to the input receiver to recover digital data bits from the serial digital transmission bit stream; a low pass filter coupled to the data recoverer convert the digital data bits into an analog transmission signal; a mixer coupled to the low pass filter to up-convert the analog transmission signal from a baseband frequency to a second selectable carrier frequency as a transmit radio frequency signal; and an amplifier coupled to the mixer and an antenna, the amplifier to amplify the transmit radio frequency signal for broadcast over the antenna.

Abstract: An image display device includes a case with an opening, a luminous source image display displaying a first image, and a focusing element. The focusing element is positioned within the case, and includes a concave mirror and a mirror supporter that supports the concave mirror. The mirror supporter includes a mirror cradle. The mirror screen is mounted on the arms of the mirror cradle. The mirror cradle includes a buffering pad at the tip of each arm, and the buffering pad includes adhesive parts on both surfaces. The tip of the arms of the mirror cradle is attached to the back of the mirror screen, and the attachment is achieved with a surface contact. The mounting holes on the top and bottom plates are oblong. The oblong mounting holes are adapted to adjust the mounting position of the mirror screen of the image display device.

Abstract: An image display device includes a case having an opening, a luminous source image display displaying a first image, a focusing element receiving light from the source image display and focusing the light to form a second image that is viewable through the opening of the case, and an image source providing image information to the source image display so that the source image display displays the first image. The focusing element has a concave mirror and a mirror supporter that supports the concave mirror. The perimeter of the concave mirror has at least one straight-cut portion that has a line contact with the mirror supporter. The image information provided by the image source is changed with user interaction.

Abstract: A down-converting circuit for a multiple-band wireless communications device needs only one voltage-controlled (VCO) with a relatively narrow tuning range, and down-converts multiple different received RF signals to produce intermediate frequency (IF) signals having a common frequency. The VCO output signal serves as a first LO signal. The circuit also has up to two frequency translators, the first of which (e.g., a divide-by-2 translator) receives the VCO output signal and produces a second LO signal. The second frequency translator (e.g., a divide-by-1.5 frequency translator) also receives the VCO output signal and produces a third LO signal. The received RF signals are down-converted using the LO signals and mixers. One of the received RF signal types is a GPS signal, which is down-converted using an LO produced at the output of a divide-by-1.5 frequency translator.

Abstract: The present invention teaches a power amplifier having two or more output power devices and a combining network for switching the output path between these several power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. Either the first or second output power device is enabled depending on the output power level. A combining network is used to transform the output impedance, as required, for the proper operation of the enabled power device. By switching between a range of power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two output power devices and a mechanism for switching the output path between these two power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. By switching between the two power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two or more output power devices and a combining network for switching the output path between these several power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. Either the first or second output power device is enabled depending on the output power level. A combining network is used to transform the output impedance, as required, for the proper operation of the enabled power device. By switching between a range of power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two output power devices and a mechanism for switching the output path between these two power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. By switching between the two power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.