PMB2208 データシートの表示（PDF） - Infineon Technologies

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PMB2208

Mixer and IF Vector Modulator

Infineon Technologies 

Confidential

PMB 2208

preliminary

Product Description

2.1 Overview

The PMB 2208 contains a direct quadrature modulator and an up/down-conver-

sion mixer with corresponding bias circuitry.

The modulator splits the signal at the LO/LOX input into two orthogonal carri-

ers. The frequency of these carriers is half of the LO/LOX input frequency. The

carriers are multiplied with the baseband modulation signals at the A/AX and

B/BX inputs. The outputs of the multipliers are added and amplified by a linear

output stage. The modulated signal is available at the E/EX output. A reference

voltage is available at the TREF output, which can be used to bias the base-

band inputs.

The mixer combines the signals at the RF/RFX and IF/IFX inputs; the resulting

signal is available at the MO/MOX output. The IF/IFX input is suitable for the

lower-frequency signal because of its linear transfer function to the output. The

higher-frequency signal is applied to the RF/RFX input, which operates in

switched mode. In a typical application, the output signal of the modulator is

band-pass filtered and then fed to the IF/IFX input of the mixer.

The modulator and mixer have separate power supplies, and can be powered

down independently. The power-down concept enables the modulator to be

used with or without the mixer.

2.2 Features

s Direct quadrature modulator and up/down-conversion mixer on one chip

s Modulator:

- LO input frequency range from 200MHz to 550MHz corresponds to an out-

put frequency range from 100MHz to 275MHz

- Generation of orthogonal carriers without external elements and without

trimming

- typ. 48dB carrier suppression with 1Vpp baseband level

- typ. 49dB SSB suppression with 1Vpp baseband level

- typ. 51dB rejection of third-order intermodulation products with 1Vpp base-

band level

- Low output noise floor

s Mixer:

- Double-balanced Gilbert cell

- RF and IF frequency range from DC to 2.5GHz

- typ 39dB carrier suppression

- Low noise

Wireless Components

2-2

Specification, August 1999

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