PMB2333 查看數據表（PDF） - Siemens AG

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PMB2333

ICs for Communications Mixer/Amplifier

Siemens AG 

PMB 2333

1.6 Circuit Description

MIXER

The mixer used in this design is a general purpose up-/down conversion gilbert cell

mixer. Via the pins MI/MIX the RF enters the IC. Using an external supplied local

oscillator at LO/LOX a converted output signal is created at the open collector output

pins MO/MOX. The open collector pins need to be connected to an external voltage

supply. The RF connection to the mixer inputs can be single ended on balanced,

capacitive or inductive. To improve the mixer performance external resistors at MI/MIX

make it possible to adjust the mixer current. Voltage supply for the mixer has to be

connected to the pin VCC and to GND2.

AMPLIFIER

The amplifier may be used as a low noise amplifier LNA or as a driver. At pin AI the RF

signal enters the IC, at the open collector output AO, which need to be connected to

supply voltage, the amplified signal is external available for further use. Matching

networks at in-/and output can be used for improving the gain and the noise

performance. To reduce the series feedback of the emitter line the amplifier is connected

to ground via three GND1 pins. At AREF a internal supplied reference voltage is

available for the DC biasing of AI. This dc output should be implemented in an input

matching network. The voltage supply for the amplifier is also VCC. The dc-level at the

pin GC allows to adjust the amplifier current.

Lower current is recommended for using the amplifier as an LNA, high current for using

it as a driver.

COMMON

Differential signals and symmetrical circuits are used throughout the mixer part of the IC.

An internal bias driver generates supply voltage and temperature compensated

reference voltages. The STB pin allows the mixer and bandgap part of the IC to be

switched in a low power mode.

All pins with the exception of GND1,2 and AI/AO are ESD protected.

Semiconductor Group

9

09.97

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