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ACPM-7833 Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPM-7833 Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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11 / 20 page  11 Power Mode PA_ON Vcntl Power Range Shut Down LOW 0V — High Power HIGH 2.5V - 28.5 dBm To Duplexer Battery Vcntl PA TxIC Switch Circuit for PA Baseband IC PA_ON Enable Vdd1 Vdd2 Vbias Vcntl PMIC or LDO Note: PMIC: Power Management IC LDO: Low Drop Output (Regulator) Design Tips to use Vcntl pin Power Amplifier Control Using Vcntl Pin on ACPM-7833 Power amplifier control scheme in CDMA systems is one of the important and challenging aspects of CDMA- based handset design. Handset designers must balance maintaining adequate linearity while optimizing efficiency at high, medium and low output power levels. The primary method to achieve these goals is to adjust the bias of the PA as a function of output power. Theoretically, the best efficiency would be achieved when the bias of the PA is continually adjusted based on the output power requirement of the PA. However, implementing this type of circuit can be complex and costly. Therefore several different approaches have been developed to provide an acceptable trade-off between optimum efficiency and optimum manufacturability. This application section reviews four methods of controlling the bias of a CDMA power amplifier: fixed, step, logical and dynamic. 1. Fixed Bias Control Using a fixed bias point on the PA is the traditional method, and it is the simplest. For example, the recommended value of the fixed control voltage on the Vcntl pin for the ACPM-7833 is 2.5V. The Vcntl pin on the PA is controlled by PA_ON pin of the baseband IC. When PA_ON is HIGH, the output RF signal of the PA is enabled, enabling the subscriber unit to transmit the required data. The switch circuit also controls the on/off state of the PA. Below is an example of how to control the the output of the PA using PA_ON and Vcntl pins. |
Similar Part No. - ACPM-7833 |
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Similar Description - ACPM-7833 |
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