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Multiple conversion tuner

A tuner and frequency converter technology, applied in multi-frequency modulation conversion, multiple resonant circuits tuned to different frequencies, demodulation and other directions, can solve the problems of interference and recovered channel signal degradation, and achieve simplified manufacturing. Effect

Inactive Publication Date: 2005-02-02
INTEL CORP
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AI Technical Summary

Problems solved by technology

The resulting tone generated on output 15 may be of sufficiently high level to cause perceptible interference and degradation of the recovered channel signal

Method used

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  • Multiple conversion tuner
  • Multiple conversion tuner
  • Multiple conversion tuner

Examples

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Embodiment Construction

[0032] The tuner of Figure 2 is similar to figure 1 The tuner, and including input 1, can be connected to receive signals from, for example, a cable distribution network or a terrestrial or satellite dish. The input 1 is connected to a first mixer 5 of the first frequency converter, the second input of which is connected to the output of a local oscillator 6 controlled by a phase locked loop (PLL) synthesizer 7 . The local oscillator 6 is tuneable so that the desired input channel is selected by translating the desired input channel to the first intermediate frequency. Specifically, a first frequency converter comprising a first mixer 5 and a first local oscillator 6 is arranged to perform up-conversion, thereby converting the selected channel to an intermediate frequency, which is higher than the frequency of the selected channel. frequency. In the illustrated tuner, the first intermediate frequency is 1.22GHz.

[0033] The output of the first mixer 5 is provided to the in...

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Abstract

A multiple conversion tuner comprises a plurality of cascade-connected frequency changers, each of which comprises a mixer and a local oscillator. The tuner also comprises a local oscillator frequency selecting circuit which controls the frequencies of the local oscillators. The frequencies are controlled so that the final mixer (10) converts a desired signal to the final intermediate frequency and so that the frequency band occupied by the desired signal at the output of each mixer is within the passband of the following intermediate frequency part of the tuner. The local oscillator frequencies are also chosen so that there is no signal of unacceptably large level in the frequency band of the desired signal at the final intermediate frequency resulting from mixing of an undesired signal with harmonics higher than the first harmonic of the local oscillator signals.

Description

technical field [0001] The invention relates to a multi-conversion tuner. Such a tuner may be used, for example, in a receiver for receiving broadcast signals over a cable distribution network or from a satellite or terrestrial antenna. Background technique [0002] Multi-conversion tuners are known for receiving radio signals. Such a tuner includes a plurality of cascaded frequency translators, each frequency translator translating the frequency of the input signal to an intermediate frequency. in the attached picture figure 1 A typical double conversion tuner is shown having an antenna input 1 for receiving a broadband radio frequency input comprising a plurality of channels spaced at frequencies eg in the range of 50 to 850 MHz. The input 1 is connected to an automatic gain control (AGC) stage 3 which controls the signal level supplied to the first frequency converter 4 so as to maximize the signal versus intermodulation plus noise performance. [0003] A first freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16H03J1/00H03J3/28
CPCH03J1/0066H03D7/161H03J1/005H03J3/28H03J2200/02
Inventor 尼古拉斯·P·考利艾伦·伊金斯
Owner INTEL CORP
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