PMB2208 查看數據表（PDF） - Infineon Technologies

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产品描述 (功能)

比赛名单

PMB2208

Mixer and IF Vector Modulator

Infineon Technologies 

Confidential

PMB 2208

preliminary

Reference

1) The mixer current decreases when no external resistors to ground are

connected at IF and IFX. In this case the typical value of ,MO+,MOX is 1mA.

2) Design hint. The settling time is determined by the time required to charge

the external capacitors.

3) Note: There are external resistors (82 Ohms) at IF and IFX to ground.

4) Application hint

5) Design hint

6) The carrier suppression can be optimized for a particular application using

offset voltages at the baseband inputs A/AX and B/BX. The optimum

values can be found iteratively by adjusting the A/AX and B/BX offsets

alternately until the carrier disappears into the noise floor. If the actual

offset voltages differ from their optimum values by ∆926$ and ∆926%, the

carrier suppression in dB is given by

ac

=

20 ⋅ log10

---------------------------V-----m-----------------------------

(∆VOSA)2 + (∆VOSB)2

where 9P is the peak value of the signal voltage at A/AX and B/BX.

7) DIM3 can be increased by reducing the amplitude of the modulator inputs

VA-AX and VB-BX.

Wireless Components

5-6

Specification, August 1999

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