Wireless transmitter using a wideband digital-to-analog converter for processing multiple channels in a digital radio-frequency signal
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsFranciscus Maria Leonardus Van der Goes, David Christopher Garrett, Jan Mulder
Life of this patent
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Abstract
A wireless transmitter processing chain includes digital radio frequency mixing circuitry to generate, in digital form, a representation of a transmit signal including multiple communication channels. From the digital representation, a wideband digital to analog converter creates the analog transmit signal that includes the communication channels. Individual mixers and filters follow, with mixing frequencies tuned to place the communication channels at the desired frequency centers.
Claims20
A system comprising:
- a digital transmit input operable to carry digital radio-frequency (RF) data including multiple communication channels spaced in frequency;
- an analog transmit output operable to carry an analog RF signal including multiple analog RF channels;
- a wideband digital-to-analog converter (WDAC) configured to receive the digital RF data on the digital transmit input and to output the analog RF signal on the analog transmit output, the WDAC configured to convert the multiple communication channels included in the digital RF data to the multiple analog RF channels included in the analog RF signal;
- and
- mixing circuitry configured to:
- receive the analog RF signal;
- and
- move each of the multiple analog RF channels included in the analog RF signal to a common center frequency on different mixed transmit outputs.
A system comprising:
- a digital transmit input operable to receive a digital radio-frequency (RF) signal including multiple communication channels;
- a wideband digital-to-analog converter (WDAC) coupled to the digital transmit input and comprising an analog transmit output, wherein:
- the WDAC is wideband by virtue of having a frequency range permitting simultaneous conversion of the multiple communication channels to analog form for transmission;
- and
- the WDAC is configured to convert the digital RF signal to an analog RF signal comprising the multiple communication channels on the analog transmit output;
- a first mixing path coupled to the analog transmit output and comprising:
- a first mixer;
- a first clock input to the first mixer and operable to deliver a first clock to the first mixer to place a first communication channel among the multiple communication channels at a first center frequency;
- and
- a second mixing path coupled to the analog transmit output and comprising:
- a second mixer;
- and
- a second clock input to the second mixer and operable to deliver a second clock to the second mixer to place a second communication channel among the multiple communication channels at a second center frequency that is different than the first center frequency.
A method comprising:
- receiving, on a digital transmit input, digital radio-frequency (RF) data representing multiple communication channels spaced in frequency;
- performing a digital to analog conversion using a wideband digital-to-analog converter (WDAC) to convert the multiple communication channels received in the digital RF data to analog RF channels in an analog RF signal on an analog transmit output;
- and
- mixing each of the analog RF channels to a common center frequency on different mixed transmit outputs.
Dependencies are inferred from the claim text.