User's Guide

FUJITSU COMPONENT LIMITED
7
3-4. Implementation of external amplifier (example)
Terminals of IF(I) and IF(Q) output can be connected to the eternal amplifier directory(DC
connection). Maximum output is 3.3Vp-p (Bias voltage = 1.65Vdc).
Fig. 5 Connection of external amplifier (example)
Relation between noise level at IF output and detectable distance
The detectable distance depend on the signal to noise ratio at IF output terminal.
External amplifier may be necessary as amplitude of IF output is small.
IF noise level inside this module(S/N) shall be well considered when the external amplifier is
added since the external amplifier amplify not only the desired wave but also the noise.
Noise at IF1/2(I/Q) output arise from RF circuitry block and IF amplifier block.
P
mix_noise
is the noise power at output of 50 ohm mixer.
V
if_noise
is the effective value of the voltage of the converted input noise of IF amplifier, and
calculated by the formula (3) and (4) below.



[W] ………………………………… (3)




󰇛
󰇜
[Vrms] …… (4)
Physical Constants
Boltzmann constant  

Absolute temp.(room temp. 25) 󰇟󰇠 
FWM7RAZ01 eigenvalue
Noise factor(positive number) 
RF power gain

 
IF-amp voltage gain

 
IF band width [Hz]
IF-amp input conversion noise
󰇟󰇠  

(at B=1Hz - 1kHz)
  

(at B=1Hz - 10kHz)
  

(at B=1Hz -100kHz)
Application dependent parameter
IF band width 󰇟󰇠 with consideration for object max. speed
V
if2
V
if2
G
ext
f1
G
ext
f1
External Amps
H-SFT
L-SFT
IF1
IF2
V
if
V
if
Vcc
/CE
LDO
MCU
EEPROM
DAC
Band
Control
LPF
I
Q
IF-AMP
VCO
Transceiver
Tx
Rx
PA
LNA
90°
FWM7RAZ01