RFUV1002 Datasheet, PDF (13/17 Pages) RF Micro Devices – 9GHz TO 14GHz GaAs MMIC IQ UP-CONVERTER

RFUV1002
Typical Bias Sequence and Gain Control
Optimum performance is achieved using sequential bias. At maximum gain (VC1 ,VC4), VC2 and VC3 are set at -3V. (VC1 ,VC4),
VC2 and VC3 are biased in sequence. The first dynamic range is achieved by setting VC2 and VC3 at -3V and varying (VC1
,VC4) over the (-3 to 0V) range as shown in the table below. Similarly second dynamic range is achieved by setting (VC1 ,VC4)
at 0V, VC3 at -3 and varying VC2 over the (-3 to 0V) range. Finally third dynamic range is achieved by setting (VC1 ,VC4) and
VC2 at 0V and varying VC3 over the (-3 to 0V) range.
Bias Sequence 1 (Typical)
Gmax
Gmin
VC1, VC4 -3 -2 -1 0
0
0
0
0
0
0
VC2
-3 -3 -3 -3 -2 -1 0
0
0
0
VC3
-3 -3 -3 -3 -3 -3 -3 -2 -1 0
Better NF at minimum gain is achieved using bias sequence 2.
Bias Sequence 2
Gmax
Gmin
VC1, VC4 -3 -2.5 -2 -1.5 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
VC2
-3 -3 -3 -3 -3 -2.5 -2 -1.5 -1 -0.5 -0.5 -0.5 -0.5 -0.5 -0.5 -0.5
VC3
-3 -3 -3 -3 -3 -3 -3 -3 -3 -3 -2.5 -2 -1.5 -1 -0.5 0
DS110908
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
13 of 17