Baseband processing circuitry
AssigneeQUALCOMM Incorporated
InventorsLi-Chung Chang, Bindu Gupta, Timothy Donald Gathman, Ibrahim Ramez Chamas
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Abstract
Techniques for designing baseband processing circuitry for radio IC's. In an aspect, techniques for differential-to-single-ended conversion in a baseband portion of the IC are disclosed to reduce the pin count and package size for RF IC's. In another aspect, the converter includes selectable narrowband and wideband amplifiers, wherein the wideband amplifiers may be implemented using transistor devices having smaller area than corresponding transistor devices of narrowband amplifiers. Further techniques for bypassing one or more elements, and for implementing a low-pass filter of the converter using an R-C filter network, are described.
Claims25
An apparatus comprising:
- a baseband amplifier configured to convert a differential current signal into a single-ended output voltage, the baseband amplifier comprising a trans-impedance amplifier configured to generate a first differential voltage from the differential current signal, the trans-impedance amplifier having a bandwidth selectable from a first band and a second band;
- and
- an output pin coupled to the single-ended output voltage.
An apparatus comprising:
- a low-pass filter configured to filter a differential signal to generate a first differential voltage;
- an amplifier configured to generate a single-ended output voltage from the first differential voltage;
- and
- a plurality of switches to selectively bypass the amplifier that is configured to generate the single-ended output voltage from the first differential voltage.
An apparatus comprising:
- means for converting a baseband differential current signal into a single-ended output voltage, the means for converting comprising means for generating a first differential voltage from the differential current signal, the means for generating the first differential voltage having a bandwidth selectable from a first band and a second band;
- and
- means for coupling the single-ended output voltage to an output pin.
An apparatus comprising:
- means for filtering a differential signal to generate a first differential voltage;
- means for generating a single-ended output voltage from the first differential voltage;
- and
- means for selectively bypassing the means for generating the single-ended output voltage.
Dependencies are inferred from the claim text.