RF6001 datasheet(29/70 Pages) RFMD

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RF6001

Rev A3 DS050929

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Part of the POLARIS™ TOTAL RADIO™ Solution

The next diagram illustrates operation of the PA ramp control system for a GPRS transmit sequence. In this case, the

GPRS_TX1 bit should be programmed to one (1), and GPRS_TX2 is set to zero (0). As in the GSM burst case, the sequence is

initiated by taking the TXST pin high. The DAC1 pin will ramp to the output level set by the PAR and PAG settings. The new power

level for the next GPRS slot should then be programmed into the PAG register. When TXST is taken low and then high again, the

system will ramp to the new value in the PAG register, again using the waveform programmed into the PAR registers. (The

change is initiated on the rising edge of TXST.) This can continue indefinitely until a PAG value of zero is programmed. The sys-

tem will then ramp down to the minimum (DAC1V) value on the falling edge of TXST. The TXEN pin will then return low after a

delay set by TXEND after the ramp down has completed.

DAC

Output

DAC1V

TXENU

TXEND

TX_ST

TX_EN

Standard GSM Single Burst

(GPRS_TX1=0, GPRS_TX2=0)

PAR[15]+DAC1

PAG*

PAT

DAC

Output

DAC1V

PAG(1)*PAR[15]+DAC1V

TX_EN

TX_ST

GPRS Mode 1

(GPRS_TX1=1, GPRS_TX2=0)

PAG(2)*PAR[15]+DAC1V

PAG(3)*PAR[15]+DAC1V

PAG

(SDI)

PAG(1)

PAG(2)

PAG(3)

PAG(4)=0

TXENU

TXEND

PAT

RF6001 Datasheet(PDF) 29 Page - RF Micro Devices

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