Radio signal receiving apparatus and demodulating circuit
First Claim
1. A wireless signal receiving device, comprising:
- signal receiving means for receiving multiple received signals having different received signal frequencies;
fixed frequency signal generating means for generating fixed frequency signals having fixed frequencies;
standard frequency signal generating means for generating standard frequency signals for receiving having standard frequencies for receiving corresponding respectively to each of said received signals;
local oscillation signal generating means for generating local oscillation signals having local oscillation frequencies equal to said received signal frequencies of said received signals from said fixed frequency signals and said standard frequency signals for receiving and to be used in common in each of said received signals; and
multiple demodulation means for demodulating said received signals by using said corresponding local oscillation signals.
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Abstract
The object of this invention is to demodulate received signals having different received signal frequencies with the simple circuit configuration. With the present invention, the fixed frequency signals are generated at the fixed PLL unit 310, and simultaneously, the standard frequency signals corresponding respectively to GSM/DCS received RF signals are generated at the channel PLL unit 330. And using the image removal mixer 370 jointly to received RF signals, local oscillation signals having local oscillation frequencies equal to the received signal frequencies of the received RF signals respectively are formed from the fixed frequency signals and the standard frequency signals for receiving. And since the quadrature demodulators 254 and 264 demodulate the received RF signals using corresponding local oscillation signals respectively, the circuit configuration can be simplified by sharing the image removal mixer 370. Thereby, receiving signals having different received signal frequencies can be demodulated with the simple circuit configuration.
21 Citations
6 Claims
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1. A wireless signal receiving device, comprising:
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signal receiving means for receiving multiple received signals having different received signal frequencies;
fixed frequency signal generating means for generating fixed frequency signals having fixed frequencies;
standard frequency signal generating means for generating standard frequency signals for receiving having standard frequencies for receiving corresponding respectively to each of said received signals;
local oscillation signal generating means for generating local oscillation signals having local oscillation frequencies equal to said received signal frequencies of said received signals from said fixed frequency signals and said standard frequency signals for receiving and to be used in common in each of said received signals; and
multiple demodulation means for demodulating said received signals by using said corresponding local oscillation signals. - View Dependent Claims (2, 3)
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4. A demodulation processing circuit, comprising:
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fixed frequency signal generating means for generating fixed frequency signals having fixed frequencies;
standard frequency signal generating means for generating standard frequency signals for receiving having standard frequencies for receiving corresponding respectively to multiple received signals having different received signal frequencies;
local oscillation signal generating means for generating local oscillation signals having local oscillation frequencies equal to said received signal frequencies of said received signals from said fixed frequency signals and said standard frequency signals for receiving and to be used in common-in each of said received signals; and
multiple demodulation means for demodulating said received signals by using said corresponding local oscillation signals. - View Dependent Claims (5, 6)
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Specification