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US 2011/0085616 A1Published application
Digital to analog converter comprising mixer
AssigneeInfineon Technologies AG
InventorFranz KUTTNER
Life of this patent
Estimating the term…
Abstract
In some embodiments, digital to analog converters are provided which comprise a plurality of cells. Each cell comprises a mixer and coupling circuitry to selectively couple a local oscillator signal to said mixer.
Claims25
A digital to analog converter comprising:
- a digital signal input,
- a plurality of cells, each cell comprising a mixer, and coupling circuitry configured to selectively couple a local oscillator signal to each of said mixers based on a signal at said digital signal input.
A digital to analog converter comprising:
- a plurality of current sources,
- a plurality of mixers, each of said mixers being coupled with one of said current sources,
- a plurality of coupling circuitries, each coupling circuitry being associated with one of said mixers, and input of said coupling circuitry being coupled with a local oscillator signal, an output of said coupling circuitry being coupled with the respective associated mixer and a control input of said coupling circuitry being coupled with a digital signal input of said digital to analog converter.
A digital to analog converter cell, comprising:
- a control input,
- a local oscillator input,
- an inverted local oscillator input,
- a current source,
- a first transistor, wherein a first terminal of said transistor is coupled with said current source, wherein a second terminal of said first transistor is coupled with an output node of said cell, and wherein a control input of said first transistor is coupled with an output of a first coupling circuit, wherein a first input of said first coupling circuit is coupled with said local oscillator input and wherein a second input of said first coupling circuit is coupled with said control input of said cell, and
- a second transistor, wherein a first terminal of said transistor is coupled with said current source, wherein a second terminal of said second transistor is coupled with an output node of said cell, and wherein a control input of said second transistor is coupled with an output of a second coupling circuit, wherein a first input of said second coupling circuit is coupled with said inverted oscillator input and wherein a second input of said second coupling circuit is coupled with said control input of said cell.
3 more elements
A transmitter, comprising:
- digital signal processing circuitry to generate a digital transmit signal,
- a digital to analog converter to convert said digital transmit signal to an analog transmit signal, wherein said digital to analog converter comprises a plurality of cells, each cell comprising a mixer configured to generate a portion of said analog transmit signal mixed with a local oscillator signal, and
- an antenna to receive said analog transmit signal.
A method, comprising:
- receiving a digital input signal, and
- selectively coupling a local oscillator signal to a plurality of mixers based on said digital input signal.
Dependencies are inferred from the claim text.