RFMD2081 Datasheet, PDF (15/18 Pages) RF Micro Devices – 45MHz TO 2700MHz IQ MODULATOR WITH SYNTHESIZER/VCO

RFMD2081
Typical Performance Characteristics: IQ Modulator
V_DD = +3V and T_A = +27°C unless stated otherwise, as measured on RFMD2081 evaluation board. I and Q input
level 1V_P-P differential with +1.3V DC bias.
Modulator Typical Performance
I & Q Unadjusted, Output Unmatched
0.0
0.0
Modulator Typical Performance
Linearity, Output Unmatched
20.0
-10.0
-20.0
-30.0
-40.0
Wanted Signal
Sideband Suppression
LO Suppression
IM3 Product
-10.0
-20.0
-30.0
-40.0
-50.0
-50.0
-60.0
-60.0
-70.0
0.0
500.0
-70.0
1000.0 1500.0 2000.0 2500.0 3000.0
Output Frequency (MHz)
Modulator Performance Vs Common Mode Bias Voltage
Output Frequency = 1250 MHz
20.0
165
10.0
160
0.0
155
-10.0
150
-20.0
145
Wanted Signal
-30.0
Output P1dB
140
Output IP3
-40.0
IM3 Product
135
Supply Current
-50.0
130
-60.0
125
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
0.0
160.0
150.0
140.0
130.0
Wanted Signal
Output P1dB
Output IP3
500.0 1000.0 1500.0 2000.0 2500.0 3000.0
Output Frequency (MHz)
Typical Total Supply Current
+3.0V Supply
1.0V Bias
1.1V Bias
1.2V Bias
1.3V Bias
1.4V Bias
1.5V Bias
120.0
110.0
-70.0
0.7
0.9
1.1
1.3
1.5
1.7
1.9
Input Common Mode Bias Voltage (Volts)
120
2.1
Modulator Output Frequency Response
Versus Shunt Matching Inductor Value
0.0
-10.0
-20.0
-30.0
-40.0
Unmatched
27nH Shunt
15nH Shunt
8.2nH Shunt
3.9nH Shunt
2.7nH Shunt
100.0
0.0
500.0 1000.0 1500.0 2000.0 2500.0 3000.0
Output Frequency (MHz)
The modulator output power can be improved
as output frequency increases by using a
shunt inductor (L1 on Application Schematic)
to resonate with the modulator output capaci-
tance, typically 1 pF.
The output transformer used for characteriza-
tion is the RFXF8553 (T1) which has 3 dB cut
off point at 2500MHz.
-50.0
0.0
500.0 1000.0 1500.0 2000.0 2500.0 3000.0
Output Frequency (MHz)
DS140110
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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