Monolithic generation of RF for wireless transmission of video
AssigneeConexant Systems, Inc.
InventorJoshua I. Pine
Life of this patent
Estimating the term…
Abstract
A digital imaging system generates a composite video signal and the carrier frequency of a desired television channel is generated internal to the imager integrated circuit. The carrier frequency is then amplitude modulated with the composite video signal by either digital or analog means located on-chip. Thus, a radio frequency signal that can be picked up by conventional television receivers is directly synthesized on-chip to provide a wireless video link.
Claims12
An integrated circuit formed in a CMOS structure, comprising:
- an imager circuit formed in the CMOS structure for developing a composite video signal;
- clock circuitry formed in the CMOS structure for providing a clock signal set at a radio frequency;
- and
- a modulator formed in the CMOS structure for modulating the clock radio frequency signal with the composite video signal to generate a radio frequency signal for wireless transmission, where said modulator comprises a digital multiplier circuit, receiving as the composite video signal as a first input, and the radio frequency clock signal as a second input.
A method implemented in a CMOS structure for modulating a radio frequency signal with a composite video signal, the steps of the method comprising:
- generating a composite video signal on a CMOS chip;
- generating a carrier frequency signal on the CMOS chip;
- and
- modulating the carrier frequency signal with the composite video signal to thereby generate a radio frequency signal for wireless transmission, wherein the modulating step includes a digital multiplier circuit receiving the composite video signal as a first input and the carrier frequency signal as a second input.
A single chip integrated circuit, comprising:
- clock circuitry providing a radio frequency clock signal on the single chip integrated circuit;
- an imager circuit for developing a composite video signal on the single chip integrated circuit, the imager circuit using the radio frequency clock signal in generating the composite video signal;
- a first transistor having the radio frequency clock signal supplied to a first control terminal thereof on the single chip integrated circuit;
- and
- a second transistor having a signal supplied to a control terminal thereof which comprises the radio frequency clock signal shifted in phase by 180°, for modulating the composite video signal with the radio frequency clock signal to generate a radio frequency signal on the single chip integrated circuit for wireless transmission.
A single chip integrated circuit, comprising:
- clock circuitry providing a radio frequency clock signal on the single chip integrated circuit;
- an imager circuit for developing a composite video signal on the single chip integrated circuit, the imager circuit using the radio frequency clock signal to develop the composite video signal;
- and
- first and second transistors having the radio frequency clock signal supplied to respective control terminals thereof, and third and fourth transistors having the radio frequency clock signal shifted in phase by 180° supplied to respective control terminals thereof, for modulating the radio frequency clock signal with the composite video signal to generate a radio frequency signal on the single chip integrated circuit for wireless transmission.
A video communication system, comprising:
- an imager circuit formed on an integrated circuit operable to generate a composite video signal;
- clock circuitry formed on the integrated circuit operable to provide a radio frequency clock signal;
- a modulator formed on the integrated circuit operable to modulate the radio frequency clock signal with the composite video signal to generate a radio frequency video signal for wireless transmission;
- and
- a television receiver operable to receive the radio frequency video signal via an antenna and display the radio frequency video signal on a screen.
Dependencies are inferred from the claim text.