# US 2009/0268643 A1 · Radio transceiver on a chip > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2009/0268643 A1 - Document ID: US20090268643A1 - Status: Published application - Kind: A1 - Application number: 12/501,616 - Filed: 2009-07-13 - Published: 2009-10-29 - Earliest claimed: 1997-02-20 - Assignees: Telefonaktiebolaget L M Ericssson (Publ) - Inventors: Karl Håkan Torbjörn Gärdenfors; Sven Mattisson; Jacobus Cornelis Haartsen - Web page: https://patentgrep.com/patent/US20090268643A1 ## CPC - H04B 1/44: Transmit/receive switching - H04B 1/3833: {Hand-held transceivers} - H04B 1/408: the transmitter oscillator frequency being identical to the receiver local oscillator frequency - H04B 1/715: Interference-related aspects - H04B 15/00: Suppression or limitation of noise or interference (by means associated with receiver H04B1/10) - H04J 3/10: Arrangements for reducing cross-talk between channels - H04L 5/1461: {Suppression of signals in the return path, i.e. bidirectional control circuits} - H04L 27/122: {using digital generation of carrier signals (digital function generators G06F1/02, H04L17/10; generating pulses having stepped portions using digital techniques H03K4/026)} - H04B 2001/7152: {with means for suppressing interference} - H04B: TRANSMISSION - H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An entire radio transceiver can be completely integrated into one IC chip. In order to integrate the IF filters on the chip, a heterodyne architecture with a low IF is used. A single, directly modulated VCO is used for both up-conversion during transmission, and down-conversion during reception. Bond-wires are used as resonators in the oscillator tank for the VCO. A TDD scheme is used in the air interface to eliminate cross-talk or leakage. A Gaussian-shaped binary FSK modulation scheme is used to provide a number of other implementation advantages. ## Claims ### Claim 1 A radio for receiving and transmitting high frequency signals, the radio comprising: a down-conversion section arranged to down-convert a received first high frequency signal; an up-conversion section arranged to up-convert an information signal, to be transmitted, to a second high frequency signal; a variable voltage controlled oscillator connected to the up-conversion section and the down-conversion section for down-converting the first high frequency signal during a receive cycle and up-converting the information signal during a transmit cycle in a time division duplex mode; and wherein the up-conversion section, the down-conversion section, and the variable controlled oscillator are integrated on a single IC chip, and the variable controlled oscillator is modulated by the information signal during the transmit cycle. ### Claim 2 (depends on 1) The radio according to claim 1, wherein the down-conversion section is arranged to down-convert the received first high frequency signal to an intermediate frequency signal having a lower frequency than the first high frequency signal. ### Claim 3 (depends on 1) The radio according to claim 1, further comprising a filter for filtering the intermediate frequency signal. ### Claim 4 (depends on 1) The radio according to claim 1, further comprising a detector for information recovery. ### Claim 5 (depends on 1) The radio according to claim 1, further comprising a shaping filter, for shaping the information signal, which shaping filter is connected to an input terminal of the IC chip. ### Claim 6 (depends on 5) The radio according to claim 5, wherein the shaping filter comprises a Gaussian shaping filter. ### Claim 7 (depends on 1) The radio according to claim 1, comprising a phase locked loop including the variable controlled oscillator. ### Claim 8 (depends on 1) The radio according to claim 1, wherein the variable controlled oscillator comprises a portion of a frequency synthesizer. ### Claim 9 (depends on 1) The radio according to claim 1, wherein the variable controlled oscillator has bond-wires as resonators. ### Claim 10 (depends on 1) The radio according to claim 1, wherein: all active components for the radio are integrated on the single IC chip; and at least one of a passive loop filter and a passive VCO resonator is located external to the single IC chip. ### Claim 11 (depends on 1) The radio according to claim 1, wherein the intermediate frequency signal has a low intermediate frequency. ### Claim 12 (depends on 11) The radio according to claim 11, wherein the low intermediate frequency is about 3 MHz. ### Claim 13 (depends on 1) The radio according to claim 1, further comprising automatic re-transmission request error correction means for data transfer. ### Claim 14 (depends on 1) The radio according to claim 1, further comprising continuous variable slope delta modulation means for voice transfer. ### Claim 15 (depends on 1) The radio according to claim 1, further comprising frequency hopping means for providing frequency hop spreading. ### Claim 16 (depends on 1) The radio according to claim 1, wherein the detector is a discriminator, for information recovery. ### Claim 17 (depends on 16) The radio according to claim 16, wherein the discriminator comprises a frequency modulation discriminator. ### Claim 18 (depends on 1) The radio according to claim 1, further comprising a binary frequency shift keying modulation means. ### Claim 19 (depends on 1) The radio according to claim 1, wherein an output of the variable controlled oscillator is connected to a power amplifier. ### Claim 20 (depends on 1) The radio according to claim 1, further comprising an image rejection device. ### Claim 21 (depends on 20) The radio according to claim 20, wherein the image rejection device is an image rejection mixer stage of the down-conversion section. ### Claim 22 (depends on 1) The radio according to claim 1, further comprising autotuning means for autotuning a plurality of filters and an FM discriminator. ### Claim 23 (depends on 1) The radio according to claim 1, wherein the radio is arranged to transmit and receive high frequency signals using a frequency-division duplex scheme. ### Claim 24 (depends on 1) The radio according to claim 1, wherein the variable controlled oscillator during the receive cycle generates a local oscillator carrier to be mixed with the first high frequency signal. ### Claim 25 (depends on 1) The radio according to claim 1, wherein the filter for filtering the intermediate frequency signal is a bandpass filter connected to the down-conversion section and tuned to pass the intermediate frequency signal. ### Claim 26 (depends on 1) The radio according to claim 1, wherein the filter is a channel filter. ### Claim 27 (depends on 1) The radio according to claim 1, wherein only one variable controlled oscillator is integrated on the single IC chip. ### Claim 28 (depends on 1) The radio according to claim 1, comprising an antenna section for transmitting and receiving a plurality of high frequency signals. ### Claim 29 A method of operating a radio transceiver, the method comprising: modulating the radio transceiver in a time division duplex mode; down-converting a received radio frequency signal during a receive cycle by means of a variable controlled oscillator; up-converting a first information signal to a high frequency signal by means of the variable controlled oscillator; wherein the variable controlled oscillator is integrated into a single IC chip; and wherein the step of up-converting comprises up-converting the first information signal to the high frequency signal during a transmit cycle by modulating the variable controlled oscillator by means of the first information signal. ### Claim 30 (depends on 29) The method of claim 29, wherein the down-converting step comprises down-converting the received radio frequency signal to an intermediate frequency signal having a lower frequency than the received radio frequency signal. ### Claim 31 (depends on 30) The method of claim 30, further comprising filtering the intermediate frequency signal. ### Claim 32 (depends on 31) The method of claim 31, further comprising detecting a second information signal from the filtered intermediate frequency signal; ### Claim 33 (depends on 29) The method according to claim 29, further comprising shaping the second information signal by means of a shaping filter.