參數(shù)資料
型號(hào)： TUA6100B6
廠商： INFINEON TECHNOLOGIES AG
英文描述： Components for Satellite Receiver Units
中文描述： 元件衛(wèi)星接收單元
文件頁數(shù)： 10/46頁
文件大?。?/td> 819K
代理商： TUA6100B6
Preliminary Specification
TUA6100B6
High-Frequency-Products
5
26.1.01
8
Circuit Description
The main function of the chip is split into bipolar analog signal processing, bipolar digital signal
generation of 0 / 90 LO-signal and a CMOS synthesizer.
Extremely symmetrical layout with matched structures promises best phase and gain balance of the
inphase and quadraturephase signals.
8.1
Input Mixer
Parameter
see RF input (950-2150MHz) symm. balanced signal on page 23
Main function is the conversion of a preselected satellite 1. IF band into the inphase and
quadraturephase baseband signals.
The input stage of the mixer is directly combined with a new patented differential input gain control of
30 dB control range and a double balanced mixer with additional gain control of 15 dB in the output.
The integration of the gain control into the mixer cell results in high compression point / IP3 at full
attenuation and requires low chip area .
The differential input has low impedance and is designed for 50
Due to the built in gain control the mixer conversion gain varies between -10 and +35 dB.
The output is internal DC-coupled to the first base band amplifier.
For best performance the 0 / 90 LO-signal is fed to the mixer via open collector stages with well
defined output impedance and levels.
The
AGC voltage input
is positive DC-controlled, that means 0.5V - min. gain, 3V - max. gain,
with MOS high impedance input.
The characteristic of the
RF gain control range
is mainly non linear .
systems with a certain mismatch.
8.2
Baseband Amplifier
Parameter
see Base band I / Q output, on page 23
and
Base band I / Q output filtered, on page 24
The 4 base band amplifiers are of wide-band operational type with high overshoot margin.
The DC reference voltage is internal set to 2.15 V dc .
All the amplifiers have a fixed gain of 16 dB and 30 MHz
-0dB
bandwidth.
The distribution of the whole DC-gain into two AC-coupled 16 dB amplifiers ensures that the
base band amplifiers are not overdriven by a large DC-voltage that may be caused by mixer offset or
mixer LO feedback to the input.
All 4 outputs can be disabled by bus control. (
Register 02
,D14)
In this state the outputs switch to low voltage and low impedance.
8.3
Output Ports
Parameter
see Port outputs, P0, P1, P2 on page 26
The output ports are designed with open collector transistor for high current pull down and slow
switching application.
8.4
Reference Voltage
Parameter
see Power supply on page 23
The central reference voltage is a low noise high PSSR bandgap with approx. 2.4 V DC and
low temperature drift.
8.5
Reference Oscillator
Parameter
see Reference oscillator input / Crystal on page 24
The reference oscillator input is the low impedance feedback of a cascode amplifier and uses the
low series resonance of a crystal to generate an oscillation condition.
For a wide characteristic range the reference oscillator can use crystals from 1 - 16 MHz and may be
used as external AC-coupled reference input if no crystal is present.
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