Mobile phone transceiver
First Claim
Patent Images
1. A transceiver comprising:
- circuitry for receiving an input signal in one of a plurality of frequency bands;
circuitry for tuning the input signal to an intermediate frequency signal;
a single frequency oscillator generating a reference signal at a known frequency;
circuitry for demodulating said intermediate frequency signal controlled by said reference signal;
circuitry for transmitting data at a frequency controlled directly by a submultiple frequency of said reference signal.
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Abstract
A multiple band transceiver (10) uses a fixed frequency oscillator (34) to generate a reference signal in both receive, mode and transmit mode for each frequency band. A dual-band variable oscillator (26) is used to tune signals in receive and transmit mode. The use of the fixed frequency oscillator in both modes and in each band reduces the number of oscillating components, simplifying the circuit and reducing power requirements.
27 Citations
16 Claims
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1. A transceiver comprising:
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circuitry for receiving an input signal in one of a plurality of frequency bands;
circuitry for tuning the input signal to an intermediate frequency signal;
a single frequency oscillator generating a reference signal at a known frequency;
circuitry for demodulating said intermediate frequency signal controlled by said reference signal;
circuitry for transmitting data at a frequency controlled directly by a submultiple frequency of said reference signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for transmitting and receiving signals, comprising the steps of:
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receiving an input signal in one of a plurality of frequency bands;
tuning the input signal to an intermediate frequency signal;
generating a reference signal at a known frequency with a single fixed frequency oscillator;
demodulating said intermediate frequency signal responsive to said reference signal;
transmitting data at a frequency directly responsive to a submultiple frequency of said reference signal. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A transceiver comprising:
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circuitry for receiving an input signal in one of a plurality of frequency bands;
a voltage controlled oscillator to produce a signal having a desired frequency response to a selected channel;
a mixer coupled to said voltage controlled oscillator and said input signal to generate an intermediate frequency signal;
a single fixed frequency oscillator generating a reference signal at a known frequency;
circuitry for demodulating said intermediate frequency signal controlled by said reference signal;
circuitry for transmitting data at a frequency controlled by said reference signal;
first frequency division circuitry for dividing said reference signal by a first known factor;
circuitry for modulating data on a signal of a predetermined frequency;
second frequency division circuitry for dividing said signal of said predetermined frequency by a second known factor; and
difference circuitry for generating an output response to phase and frequency differences between output of said first frequency division circuitry and said second frequency division circuitry. - View Dependent Claims (14, 15, 16)
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Specification