Radio tranceiver for data communications
First Claim
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1. A radio frequency (RF) transceiver comprising:
- an RF transmitter section;
an RF receiver section;
an antenna terminal;
a transmit/receive (T/R) switching section comprising a first and a second switch, said T/R switching section having an RF transmit input terminal for receiving an RF transmit signal, a receiver input terminal coupled to said antenna terminal, a receiver output terminal coupled to said RF receiver section, an RF output terminal coupled to said antenna terminal, and control signal input terminals, said first switch of said T/R switching section being operable to selectively connect said receiver input terminal to said receiver output terminal, and said second switch of said T/R switching section being operable to selectively connect said RF transmit input terminal to said RF output terminal;
a transmit/local oscillator (T/LO) switching section comprising a first and a second switch, said T/LO switching section having an RF transmit input terminal for receiving RF transmit signals from the RF transmitter section, a local oscillator input terminal for receiving a local oscillator signal, an RF transmit output terminal, a local oscillator output terminal for providing a local oscillator signal to said RF receiver section, and control signal input terminals, said first switch of said T/LO switching section being operable to selectively connect said RF transmit input terminal to said RF transmit output terminal, and said second switch of said T/LO switching section being operable to selectively connect said local oscillator input terminal to said local oscillator output terminal;
means coupling said RF transmit output terminal of said T/LO switching section to said RF transmit input terminal of said T/R switching section; and
a control circuit coupled to said control input terminals of said T/R switching section and said T/LO switching section, said control circuit including means for providing transmit mode control signals to said T/R switching section and said T/LO switching section, wherein in response to receipt of transmit mode control signals said first switch of said T/LO switching section is closed and said second switch of said T/LO switching section is opened, and further wherein said first switch of said T/R switching section is opened and said second switch of said T/R switching section is closed.
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Abstract
A compact low-power radio frequency (RF) transceiver with a built-in antenna provides wireless communication between a computer and another device. A direct conversion receiver together with a voltage controlled oscillator, phase lock loop circuits, digitally controlled divider circuits and a patch antenna are packaged into a compact enclosure, having dimensions within the PCMCIA format. In some embodiments, the transceiver enters a sleep mode whenever it is idle in order to further conserve power. In other embodiments, a signature detector enables the transceiver to distinguish between noise and valid messages by recognizing a signature word embedded in the data packet.
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Citations
3 Claims
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1. A radio frequency (RF) transceiver comprising:
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an RF transmitter section;
an RF receiver section;
an antenna terminal;
a transmit/receive (T/R) switching section comprising a first and a second switch, said T/R switching section having an RF transmit input terminal for receiving an RF transmit signal, a receiver input terminal coupled to said antenna terminal, a receiver output terminal coupled to said RF receiver section, an RF output terminal coupled to said antenna terminal, and control signal input terminals, said first switch of said T/R switching section being operable to selectively connect said receiver input terminal to said receiver output terminal, and said second switch of said T/R switching section being operable to selectively connect said RF transmit input terminal to said RF output terminal;
a transmit/local oscillator (T/LO) switching section comprising a first and a second switch, said T/LO switching section having an RF transmit input terminal for receiving RF transmit signals from the RF transmitter section, a local oscillator input terminal for receiving a local oscillator signal, an RF transmit output terminal, a local oscillator output terminal for providing a local oscillator signal to said RF receiver section, and control signal input terminals, said first switch of said T/LO switching section being operable to selectively connect said RF transmit input terminal to said RF transmit output terminal, and said second switch of said T/LO switching section being operable to selectively connect said local oscillator input terminal to said local oscillator output terminal;
means coupling said RF transmit output terminal of said T/LO switching section to said RF transmit input terminal of said T/R switching section; and
a control circuit coupled to said control input terminals of said T/R switching section and said T/LO switching section, said control circuit including means for providing transmit mode control signals to said T/R switching section and said T/LO switching section, wherein in response to receipt of transmit mode control signals said first switch of said T/LO switching section is closed and said second switch of said T/LO switching section is opened, and further wherein said first switch of said T/R switching section is opened and said second switch of said T/R switching section is closed. - View Dependent Claims (2, 3)
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Specification