Simplified High Frequency Tuner and Tuning Method
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0 Petitions
Accused Products
Abstract
A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.
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Citations
148 Claims
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1-36. -36. (canceled)
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37. A tuning method comprising, with a tuning device:
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(a) receiving a channel of interest from a channelized spectrum having a predetermined channel spacing; (b) frequency translating the channel of interest to a passband that is near-baseband and the lower edge of which is spaced from DC by at least about the channel spacing, by mixing the channel of interest with approximately phase-quadrature local oscillator signals, thereby creating I and Q signals; (c) sensing the operating temperature of the tuning device; and (d) using the sensed temperature to correct errors between the I and Q signals. - View Dependent Claims (139)
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38-39. -39. (canceled)
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40. A tuning method comprising:
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(a) receiving a channel of interest from a channelized spectrum having a predetermined channel spacing; (b) frequency translating the channel of interest to a passband that is near baseband and the lower edge of which is spaced from DC by at least about the channel spacing, by mixing the channel of interest with approximately phase-quadrature local oscillator signals, thereby creating I and Q signals; and (c) using information characterizing errors between the I and Q channels of the individual tuning device, which information has been stored within the device upon completion of device manufacture, to correct errors between the I and Q channels. - View Dependent Claims (140)
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41-42. -42. (canceled)
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43. A method of tuning comprising:
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(a) receiving a channel of interest from a channelized spectrum having a predetermined channel spacing; (b) frequency translating the channel of interest to a passband that is near-baseband and the lower edge of which is spaced from DC by at least about the channel spacing, by mixing the channel of interest with approximately phase-quadrature local oscillator signals thereby creating I and Q signals; and (c) continuously detecting and correcting errors between the I and Q channels. - View Dependent Claims (141)
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44. (canceled)
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45. An apparatus for tuning a channel of interest from a channelized spectrum having a predetermined channel spacing, the apparatus comprising:
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(a) a local oscillator configured to generate approximately phase-quadrature local oscillator signals; (b) a filter configured to define a near-baseband passband; (c) mixers, each responsive to one of the phase-quadrature local oscillator signals and the signal of interest, that frequency-translate the signal of interest creating I and Q signals that fall within the near-baseband passband; and (d) an operating-temperature sensor coupled to correct errors between the I and Q signals. - View Dependent Claims (46, 142, 143)
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47-49. -49. (canceled)
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50. A method of tuning comprising:
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(a) receiving a channel of interest from a channelized spectrum having a predetermined channel spacing; (b) mixing the channel of interest with approximately phase-quadrature local oscillator signals, thereby creating I and Q signals; (c) frequency translating the channel of interest to a near-baseband passband that has a width equal to about the channel spacing plus a fine tuning adjustment; (d) fine tuning the channel of interest by passing a selected range of passband; (e) sensing the operating temperature of the tuning device; and (f) using the sensed temperature to correct errors between the I and Q channels. - View Dependent Claims (52, 144, 145)
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51. (canceled)
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53. (canceled)
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54. A tuning method comprising, with a tuning device:
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(a) receiving a channel of interest from a channelized spectrum having a predetermined channel spacing; (b) mixing the channel of interest with approximately phase-quadrature local oscillator signals, thereby creating I and Q channels; (c) frequency translating the channel of interest to a near-baseband passband that has a width equal to about the channel spacing; (d) dynamically varying the passband bandwidth; (e) further translating the frequency-translated channel of interest to baseband by mixing the frequency-translated channel of interest with a second local oscillator signal; and (f) sensing the operating temperature of the tuning device and using the sensed temperature information to correct errors between the I and Q channels. - View Dependent Claims (55, 146, 147)
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56-138. -138. (canceled)
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148-166. -166. (canceled)
Specification