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參數(shù)資料
| 型號： | PMB2208 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Mixer and IF Vector Modulator |
| 中文描述： | 混頻器和中頻矢量調(diào)制器 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大小： | 766K |
| 代理商： | PMB2208 |
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Functional Description
3 - 6
PMB 2208
preliminary
Wireless Components
Confidential
Specification, August 1999
3.5
Circuit Description
The modulator performs a direct quadrature modulation. The LO signal is con-
nected to an emitter-coupled transistor pair. The LO signal is split internally into
two orthogonal carriers at half of the LO/LOX input frequency. The accuracy of
the internal 90° phase shift requires a balanced input signal and depends on the
accuracy of the 50% duty cycle of the LO/LOX signal. The modulator has two
Gilbert cell mixers, in which the baseband modulation signals at the A/AX and
B/BX inputs are multiplied with the orthogonal carriers. The outputs of the two
Gilbert cells are added and amplified by a linear output stage. The modulated
transmit signal is available at the high-impedance, open-collector output E/EX.
It can be band-pass filtered and fed to the IF/IFX input of the mixer.
At the TREF output, a reference voltage is available, which should be capaci-
tively decoupled to ground. TREF can be used to set the DC bias of the base-
band inputs using external resistors. Alternatively, the DC level can be set
independently of TREF, provided it is within the specified operational range.
The up/down-conversion mixer is a fully-balanced Gilbert cell. The transfer
function from the low-impedance emitter input IF/IFX to the output is linear for
input levels below the 1dB compression point. For improved intermodulation,
the mixer current can be increased with external resistors to ground at IF/IFX.
The high-impedance input RF/RFX is directly connected to the bases of the
switching transistors. The input level should be high enough to ensure proper
switching. The output signal of the mixer is available at the high-impedance,
open-collector outputs MO/MOX.
The modulator and the mixer have separate supply and power-down pins:
VCC1, PD1 for the modulator and VCC2, PD2 for the mixer. Applying a logic
LOW to PD1 or PD2 powers down the corresponding part of the chip, including
its bias circuitry. Depending on the application, the power-down pins can be
combined or separately fixed to supply rails.
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