Dual band transceiver
First Claim
1. A dual band transmitter for transmitting a data signal in a first lower frequency band or a second higher frequency band, the dual band transmitter comprising:
- a first oscillating means for generating a local oscillator (LO) signal;
a second oscillating means for generating an offset frequency (OF) signal;
a first mixing means for combining said LO signal with said OF signal to produce a first transmit signal;
modulation means for modulating said first transmit signal with said data signal to produce a first data modulated transmit signal;
a second mixing means for combining said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal;
means for programming said first oscillating means and said second oscillating means such that said first data modulated transmit signal is in said first band and said second data modulated transmit signal is in said second band; and
means for transmitting said first data modulated transmit signal when transmitting in said first band, and for transmitting said second data modulated transmit signal when transmitting in said second band.
1 Assignment
0 Petitions
Accused Products
Abstract
A dual band transceiver for operating in a first lower frequency band such as the band allocated to cellular systems, and in a second higher frequency band such as the band allocated to personal communication services (PCS) systems. In a representative embodiment, the dual band transceiver comprises a main voltage controlled oscillator (VCO) for generating a local oscillator (LO) signal; an offset VCO for generating an offset frequency (OF) signal; a first mixer for combining the LO signal with the OF signal to produce a first transmit signal; a modulator for modulating the first transmit signal with the data signal to produce a first data modulated transmit signal; and a second mixer for combining the first data modulated transmit signal with the LO signal to produce a second data modulated signal. The main VCO and the offset VCO can be programmed such that the first data modulated transmit signal is in the first band and the second data modulated transmit signal is in the second band.
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Citations
30 Claims
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1. A dual band transmitter for transmitting a data signal in a first lower frequency band or a second higher frequency band, the dual band transmitter comprising:
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a first oscillating means for generating a local oscillator (LO) signal; a second oscillating means for generating an offset frequency (OF) signal; a first mixing means for combining said LO signal with said OF signal to produce a first transmit signal; modulation means for modulating said first transmit signal with said data signal to produce a first data modulated transmit signal; a second mixing means for combining said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal; means for programming said first oscillating means and said second oscillating means such that said first data modulated transmit signal is in said first band and said second data modulated transmit signal is in said second band; and means for transmitting said first data modulated transmit signal when transmitting in said first band, and for transmitting said second data modulated transmit signal when transmitting in said second band. - View Dependent Claims (2, 3, 4, 5)
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6. A dual band transmitter for transmitting a data signal in a first lower frequency band or a second higher frequency band, the dual band transmitter comprising:
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a first oscillating means for generating a local oscillator (LO) signal; a second oscillating means for generating an offset frequency (OF) signal; modulation means for modulating one of said LO signal and said OF signal with said data signal to produce a data modulated signal; a first mixing means for combining the other of said LO signal and said OF signal with said data modulated signal to produce a first data modulated transmit signal; a second mixing means for combining said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal; means for programming said first oscillating means and said second oscillating means such that said first data modulated transmit signal is in said first band and said second data modulated transmit signal is in said second band; and means for transmitting said first data modulated transmit signal when transmitting in said first band, and for transmitting said second data modulated transmit signal when transmitting in said second band. - View Dependent Claims (7, 8, 9, 10)
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11. A dual band mobile station capable of operating in a first lower frequency band or a second higher frequency band, and comprising:
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means for detecting an analog voice signal; means for processing said analog voice signal into a digital baseband data signal; and dual band transmitting means for transmitting said baseband data signal in said first band or said second band, the dual band transmitting means including; a first oscillating means for generating a local oscillator (LO) signal; a second oscillating means for generating an offset frequency (OF) signal; a first mixing means for combining said LO signal with said OF signal to produce a first transmit signal; modulation means for modulating said first transmit signal with said baseband data signal to produce a first data modulated transmit signal; a second mixing means for combining said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal; means for programming said first oscillating means and said second oscillating means such that said first data modulated transmit signal is in said first band and said second data modulated transmit signal is in said second band; and means for transmitting said first data modulated transmit signal when transmitting in said first band, and for transmitting said second data modulated transmit signal when transmitting in said second band. - View Dependent Claims (12, 13, 14, 15)
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16. A dual band mobile station capable of operating in a first lower frequency band or a second higher frequency band, and comprising:
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means for detecting an analog voice signal; means for processing said analog voice signal into a digital baseband data signal; and dual band transmitting means for transmitting said baseband data signal in said first band or said second band, the dual band transmitting means including; a first oscillating means for generating a local oscillator (LO) signal; a second oscillating means for generating an offset frequency (OF) signal; modulation means for modulating one of said LO signal and said OF signal with said baseband data signal to produce a data modulated signal; a first mixing means for combining the other of said LO signal and said OF signal with said data modulated signal to produce a first data modulated transmit signal; a second mixing means for combining said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal; means for programming said first oscillating means and said second oscillating means such that said first data modulated transmit signal is in said first band and said second data modulated transmit signal is in said second band; and means for transmitting said first data modulated transmit signal when transmitting in said first band, and for transmitting said second data modulated transmit signal when transmitting in said second band. - View Dependent Claims (17, 18, 19, 20)
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21. A method for transmitting a data signal in a first lower frequency band or a second higher frequency band, the method comprising the steps of:
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generating a local oscillator (LO) signal; generating an offset frequency (OF) signal; mixing said LO signal with said OF signal to produce a first transmit signal; modulating said first transmit signal with said data signal to produce a first data modulated signal; if said data signal is to be transmitted in said first band, selecting said LO signal and said OF signal such that said first data modulated transmit signal is in said first band, and transmitting said data modulated first band signal; and if said data signal is to be transmitted in said second band, mixing said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal, selecting said LO signal and said OF signal such that said second data modulated transmit signal is in said second band, and transmitting said second data modulated transmit signal. - View Dependent Claims (22, 23, 24, 25)
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26. A method for transmitting a data modulated signal in a first lower frequency band or a second higher frequency band, the method comprising the steps of:
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generating a local oscillator (LO) signal; generating an offset frequency (OF) signal; modulating one of said LO signal and said OF signal with said data signal to produce a data modulated signal; mixing the other of said LO signal and said OF signal with said data modulated signal to produce a first data modulated transmit signal; if said data signal is to be transmitted in said first band, selecting said LO signal and said OF signal such that said first data modulated transmit signal is in said first band, and transmitting said data modulated first band signal; and if said data signal is to be transmitted in said second band, mixing said first data modulated transmit signal with said LO signal to produce a second data modulated transmit signal, selecting said LO signal and said OF signal such that said second data modulated transmit signal is in said second band, and transmitting said second data modulated transmit signal. - View Dependent Claims (27, 28, 29, 30)
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Specification