 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ACPM-7311-BLK Datasheet(PDF) 9 Page - AVAGO TECHNOLOGIES LIMITED |
|
||||||||||||||||||||||||||||||
ACPM-7311-BLK Datasheet(HTML) 9 Page - AVAGO TECHNOLOGIES LIMITED |
|
|
9 / 18 page  9 CoolPAM Avago Technologies’ CoolPAM is stage-bypass PA tech- nology which saves more power compared with conven- tional PA. With this technology, the ACPM-7311 has very low quiescent current and efficiencies at low and medium output power ranges are very high. Incorporation of bias circuit The ACPM-7311 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-7311 supports three power modes (low power mode/mid power mode/high power mode) with two mode control pins (Vmode0 and Vmode1). This control scheme enables the ACPM-7311 to save more power, which accordingly gives extended talk time. PDF (probability density function) in Figure 15 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 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 multiplication of current and probability at each output power. Average current = ∫ (PDF x Current)dp Talk time is extended more as average current consump- tion is lowered. Mode control pins Vmode0 and Vmode1 are digitally controlled pins and they control operating mode of PA and truth table is sum- marized in table 3. These pins do not require constant voltage for interface, but high voltage input range is 1.9 though 2.9V Application on mobile board Figure 16 shows one application example on mobile board. C4 and C5 should be placed nearby pin5 and pin6. Transmission line length after PA output should be minimized to reduce conduction loss. C7 C8 BB C3 L1 output matching circuit ACPM-7311 PA_R1 PA_R0 PA_ON Ven Vmoce0 Vmode1 IN Vc1 GND GND OUT GND Vcc2 C2 TX filter RF In Coupler RF Out C1 C9 C6 V BATT C4 C5 Figure 15. PDF and Current Figure 16. Peripheral Circuits Load Insensitivity With the trend to remove the isolator from the Tx chain in UMTS handsets, the performance demands of Load Insensitivity become dependent on the combined per- formance of the remaining elements in the TX chain: the power amplifier, coupler, antenna as well as the physical layout on the phone board. The ACPM-7311, as part of optimized design, meets the necessary linearity require- ments over a 4:1 VSWR mismatch at the antenna plane. In the case of the ACPM-7311, the output stage has been designed for slightly higher Pout to provide the necessary margin to meet linearity under the mismatch experienced at the PA output port resulting from the forced antenna mismatch. Documentation is available that provides a more complete description of the system considerations and measurement considerations. To illustrate the system performance using the ACPM- 7311, Figure 17 shows measurement of TX chain with VSWR fixed at 4:1. ACLR1 is kept higher than -38dBc over all phases and gain variance is about 2dB. |
Similar Part No. - ACPM-7311-BLK |
|
Similar Description - ACPM-7311-BLK |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
