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ACPM-7392-TR1 Datasheet(PDF) 8 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPM-7392-TR1 Datasheet(HTML) 8 Page - AVAGO TECHNOLOGIES LIMITED |
8 / 18 page 8 PDF and Current Icc Comparison of CP5 to CP4 (Avago CoolPAM) The 5th generation of CoolPAM technology, ACPM-7392 can dramatically reduce Icc down to 3mA at bypass mode, which improves overall talk time and battery usage time of handset more compared with the CP4. Average current & Talk time Average current consumed by PA can be calculated by summing up current at each output power weighted with probability. So it is expressed with integration of multipli- cation of current and probability at each output power. CoolPAM Avago Technologies’CoolPAM is stage-bypass PA technol- ogy which saves more power compared with convention- al PA. With this technology, the ACPM-7392 has very low quiescent current, and efficiencies at low and medium output power ranges are high. Incorporation of bias circuit The ACPM-7392 has internal bias circuit, which removes the need for external constant voltage source (LDO). PA on/off is controlled by Ven. This is digitally control pin. 3-mode power control with two mode control pins The ACPM-7392 supports three power modes ( bypass power mode/mid power mode/high power mode) with two mode control pins (Vmode and Vbp). This control scheme enables the ACPM-7392 to save power consump- tion more, which accordingly gives extended talk time. PDF (probability density function) showing distribution of output power of mobile in real field gives motivation for stage-bypass PA. Output power is less than 16dBm for most of operating time (during talking), so it is important to save power consumption at low and medium output power ranges. 0 50 100 150 200 250 300 350 400 450 -10 0 10 20 30 Pout(dBm) CP5 CP4 0 10 20 30 40 50 60 70 -10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 16 Pout(dBm) CP5 CP4 Talk time is extended more as average current consump- tion is lowered. Mode control pins Vmode and Vbp are digitally controlled by baseband and they control the operating mode of the PA. The operating logic table is summarized on the page 2. These pins do not require constant voltage for interface. . UMTS PA performance comparison – CoolPAM 4 and CoolPAM 5 |
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