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UPC8120T Fiches technique(PDF) 8 Page - NEC

No de pièce UPC8120T
Description  -15 dBm INPUT, VARIABLE GAIN AMPLIFIER SILICON MMIC FOR TRANSMITTER AGC OF DIGITAL CELLULAR TELEPHONE
PDF  40 Pages
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
Logo NEC - NEC

UPC8120T Fiches technique(HTML) 8 Page - NEC

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8
µµµµPC8130TA, µµµµPC8131TA
APPLICATION EXPLANATION
The
µPC8130TA and µPC8131TA has difference in internal circuit in order to reduce the number of external
component with
µPC8119T and µPC8120T. For this reason, they have difference in mechanism for determing
minimum gain and external suitable constant.
Determing Minimum Gain
External Feedback Capacitor of
VCC to VAGC Pin
Optimize Choke Inductance of
π
Type Circuit on VCC Line
µPC8119T
µPC8120T
High frequency negative feed back
between OUT, VCC and VAGC pin
optimized by external choke
inductance.
Necessary
The impedance of inductance
should be very low at high
frequency region.
µPC8130TA
µPC8131TA
Isolation of VCC to OUT pin
optimized by external choke
inductance.
Unnecessary
The impedance of inductance
should be very high at high
frequency region.



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