Wideband wireless communications receiver
AssigneeMotorola, Inc.
InventorDonald H. Wong
Life of this patent
Estimating the term…
Abstract
A wideband transceiver using contiguous overlapping frequency range local oscillators (32, 34) for a high side or a low side local oscillator and an intermediate frequency approaching, within commercialy practical limits, but not exceeding one half of the total limited oscillator frequency range (71).
Claims9
A wireless communications receiver having the capability of receiving radio signals throughout a contiguous range of frequencies formed by overlapping predetermined high-side and low-side frequency bands, comprising:
- a) input means for receiving the radio signals to provide a radio signal at a desired receive frequency;
- b) oscillator means for generating a local oscillator signal frequency that
- i) is greater than said desired frequency when said desired frequency is less than a first threshold frequency, and
- ii) is less than said desired frequency when said desired frequency is greater than a second threshold frequency wherein said second threshold frequency is greater than said first threshold frequency, and
- iii) is within a total limited oscillator frequency range;
- and
- c) mixer means, responsive to said input means and said oscillator means, for producing a signal at a selected intermediate frequency that
- i) corresponds to a magnitude of a frequency difference between said desired frequency and said local oscillator signal frequency, and
- ii) is less than one half of said total limited oscillator frequency range.
A wireless communications transceiver having the capability of transmitting and receiving radio signals throughout a range of frequencies including overlapping predetermined high-side and low-side frequency bands, comprising:
- a) input means for receiving the radio signals to provide a radio signal at a desired receive frequency;
- b) oscillator means for generating a local oscillator signal frequency that
- i) is greater than said desired frequency when said desired frequency is less than a first threshold frequency, and
- ii) is less than said desired frequency when said desired frequency is greater than a second threshold frequency wherein said second threshold frequency is greater than said first threshold frequency, and
- iii) is within a total limited oscillator frequency range;
- and
- c) mixer means, responsive to said input means and said oscillator means, for producing a signal at a selected intermediate frequency that
- i) corresponds to a magnitude of a frequency difference between said desired receive frequency and said local oscillator signal frequency, and
- ii) is less than one half of said total limited oscillator frequency range;
- and
- d) transmitter means, responsive to said oscillator means, for transmitting a radio signal at a desired transmit frequency within the range of frequencies.
Dependencies are inferred from the claim text.