參數(shù)資料
型號(hào)： HFA3724IN
廠商： HARRIS SEMICONDUCTOR
元件分類： 衰減器
英文描述： 400MHz Quadrature IF Modulator/Demodulator
中文描述： MODEM
文件頁(yè)數(shù)： 19/24頁(yè)
文件大?。?/td> 186K
代理商： HFA3724IN
19
Because of the input comparators high gain, a small
overdrive of about
±
150mV from the reference level of 1.25V
is all what is needed to reliably switch and level shift the “I”
and “Q” digital signals. An external attenuator comprising of
R1 and R2 with termination in the available 1.25V reference
voltage pin (LPF BYP) can be calculated based on expected
V
IH
and V
IL
inputs from a digital interface. Capacitive
coupling must be avoided which could affect rise and fall
times needed for proper overdrive speed of the comparators.
Limiting the digital excursion on those pins greatly reduce
the possibility of signal corruption at the transmit chain.
Coupling Capacitors
Capacitor coupling is used to tie all HFA3724 blocks together.
Special bias is used to maintain the DC levels on both ends of
coupling pins (capacitors) when the device is changes from
Transmitter to a Receiver and vice versa. The capacitance
values must be chosen as a compromise to maintain proper
frequency response and settling times (when the device is
brought up from sleep mode or power down).
COMPARATOR
LEVEL
SHIFTER
TO
FROM BAND GAP
1.25V
LPF_TXI_IN
LPF TXQ_IN
LPF_BYP
11
12
13
1.25V
R2
680
TXI
TXQ
R1
R1
R2
0.1
V
IL
V
IH
V
IL
V
IH
I FILTER
COMPARATOR
LEVEL
SHIFTER
TO
Q FILTER
680
4.3K
4.3K
FIGURE 26. SIMPLIFIED BLOCK DIAGRAM OF THE
TRANSMIT DIGITAL INPUTS
HFA3724
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HFA3724IN96 制造商:Rochester Electronics LLC 功能描述:- Bulk
HFA3724INS2539 制造商:Rochester Electronics LLC 功能描述:- Bulk
HFA3725R3417 制造商:Harris Corporation 功能描述:
HFA3726 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:400MHz Quadrature IF Modulator/Demodulator
HFA3726/3728 WAF 制造商:Harris Corporation 功能描述:
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