TSH690 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TSH690' PDF : 14 Pages View PDF
TSH690
DETERMINING VBIAS AND R1 AT 450 MHz
Using the 450 MHz curves, you can easily deter-
mine VBIAS voltage and R1 to obtain the desired
power gain S21.
For a given gain S21 and a given supply voltage
VCC, you can determine the corresponding
VBIAS.using the curve ’Gain vs VBIAS’ in the ’450
MHz operation’ section.
It’s generally more convenient to supply the Vbias
from VCC than generate a separate voltage. You
just need to add the R1 resistor beetween the
VBIAS pin and VCC.
Using the curve ’Supply current vs Bias voltage’
you can determine the current IBIAS corresponding
to a VBIAS . R1 can calculated by:
R1 = (VCC - VBIAS ) / IBIAS.
One the same curve, you will find the total current
supply Icc versus the biasing conditions.
Figure 5 : Demo board silk screen (not to scale)
Figure 6 : Demo board top side (not to scale )
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