RF to baseband converters (STM...

RF to Baseband ConvertersRF to Baseband Converters
Angelo Nagari



ACLK AEN ADI ADO

10 Bit DAC 10 Bit DAC ASI 11 Bit DAC

AUXDAC1

AUXDAC2

AUXDAC3 ADCTRIG

10 Bit ADC

M U X

AUXADC1 AUXADC2 AUXADC3 ITXP ITXN

TxON BDI BIEN BICLK BOCLK BOEN BDO RxON
RX Offset Calibration

10 Bit DAC GMSK MOD 10 Bit DAC BSI Decimation Filter Decimation Filter

LP
TX Offset Calibration

Typical implementation for a Baseband Codec + Auxiliary Converters

LP

QTXP QTXN

14 Bit Σ ADC 14 Bit Σ ADC

IRXP IRXN QRXP QRXN

Baseband Codec Auxiliary DACs



n

AUX DACs requirements:
èMonotonicity èHigh speed (AGC, PA) èLow Pass Filtering (AGC,PA)
RF Filter PA

10 Bit DAC 11 Bit DAC

Power Control AGC PLL

Baseband

RF

n

AFC DAC requirements:
èResolution: 11 bits èMonotonicity: <1 LSB of DNL èLow speed → Low current consumption èOutpu