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US 7,069,042 B2Granted
Quadrature direct synthesis discrete time multi-tone generator
AssigneeIntel Corporation
InventorLuiz Franca-Neto
Life of this patent
Estimating the term…
Abstract
A tone generator in a transceiver of a communications device may generate an arbitrary signal using two shift registers to generate the time intervals. During each time interval, a different capacitor is switched onto the node to change the voltage potential on that node. The amplitude of the waveform during each time interval is changed to provide the desired tone.
Claims17
A communication device comprising:
- first and second shift registers, where the first shift register is clocked by a first clock signal and the second shift register is clocked by a second clock signal, wherein output signals from the first shift register gate the tone generator in even time intervals and output signals from the second shift register gate the tone generator in odd time intervals;
- and
- a tone generator coupled to receive signals from the first and second shift registers that are used to switch capacitance onto a node from which a tone signal is supplied.
A communication device having a transceiver and comprising:
- first and second shift registers, where the first shift register is clocked by a first clock signal and the second shift register is clocked by a second clock signal;
- a tone generator coupled to receive signals from the first and second shift registers at input terminals of respective first and second switch-capacitor pairs having output terminals that selectively switch capacitance onto a node from which a tone signal is generated;
- and
- a mixer coupled to receive a modulated signal and the tone signal and convert a carrier frequency of the modulated signal.
1 more element
A wireless communication device, comprising:
- a mixer coupled to receive a modulated signal and a tone;
- a first shift register to receive a clock signal;
- a second shift register to receive an inverted clock signal;
- and
- a tone generator to use signals from the first and second shift registers to sequentially couple one terminal of first and second capacitors to a ground potential, the other terminal of the first and second capacitors being connected to a node to supply the tone.
2 more elements
A method, comprising:
- receiving a modulated signal and a tone at a mixer;
- clocking a first shift register with a clock signal;
- clocking a second shift register with an inverted clock signal;
- and
- using signals from the first and second shift registers to change a potential on first terminals of first and second capacitors, the second terminals of the first and second capacitors being connected to a node to supply the tone.
2 more elements
The method of claim 16, further including:
- shifting a one through a field of zeros in the second shift register.
Dependencies are inferred from the claim text.