RF6001_1 RFMD [RF Micro Devices], RF6001_1 Datasheet - Page 29

• Manufacturer Part Number: RF6001_1
• Description: FRACTIONAL-N RF SYNTHESIZER WITH MODULATOR AND DIGITAL IF FILTER
• Manufacturer: RFMD [RF Micro Devices]

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.
Rev A3 DS050929
TX_EN
TX_ST
Output
DAC
(SDI)
PAG
DAC1V
TXENU
TX_EN
TX_ST
Output
PAT
DAC
PAG(1)
DAC1V
TXENU
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PAT
PAG(1)*PAR[15]+DAC1V
PAG(2)
(GPRS_TX1=0, GPRS_TX2=0)
Standard GSM Single Burst
(GPRS_TX1=1, GPRS_TX2=0)
GPRS Mode 1
PAG*
PAR[15]+DAC1
PAG(2)*PAR[15]+DAC1V
Part of the POLARIS™ TOTAL RADIO™ Solution
PAG(3)
PAG(3)*PAR[15]+DAC1V
TXEND
PAG(4)=0
RF6001
TXEND
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