AMPLIFIER BYPASS SAMPLE KIT 数据手册
Bypass Capacitor Kit for
MMIC Amplifiers
High Performance MMIC Amplifiers
High frequency MMIC amplifiers with broadband gain need to be protected from RF noise on the
supply lines, particularly RF energy coupled back into the device from its output. Supply noise creates
challenges in RF systems where it can mix with RF signals, impacting signal/noise ratios and potentially
causing spurious output.
Avoiding this requires the use of a bypass capacitor that provides an efficient path to ground for RF energy on
the supply line before it enters a gain stage. See Figure 1 for example.
FIGURE 1
VDD
High performance
MMIC amplifiers
contain multiple
stages, each
requiring their own
bypassed supply.
Bypass Capacitor
RF In
RF Out
V-Series
Our V-Series capacitors feature X7R characteristics up to 200V DC voltage rating, with a frequency range up to 40GHz and operating
temperature of -55°C to 125°C.
Figure 2 shows that selecting the correct capacitor for this application involves finding a microwave capacitor that provides the required
isolation when tested on a board in shunt. Figure 3 shows the RF isolation of our V-Series capacitor tested in such a configuration.
FIGURE 2
FIGURE 3
Typical Insertion Loss (S21)
0
-10
-20
RF Out
Bypass Capacitor
Loss (dB)
RF In
-30
-40
-50
V30BZ102M6SX
-60
V30BZ222M8SX
V30BZ472M1SX
-70
V30BZ682M1SX
V30BZ103M1SX
-80
-90
0
5
10
15
20
25
Frequency (GHz)
www.knowlescapacitors.com
30
35
40
Contents of the Amplifier Bypass Kit
Vials with SLC - Border Cap®
SLC PART NUMBERS IN VIALS:
V SERIES KIT:
D25BN121M1EX
V30BZ102M6SX
D25BN101M1EX
V30BZ222M8SX
D20BN101M1EX
V30BZ472M1SX
D25BJ680M1EX
V30BZ682M1SX
D50BD680K1EX
V30BZ103M1SX
Key Factors
Isolation performance at microwave frequencies, CV density (capacitance and voltage capability in
a given footprint) and the quality of the wire bond and ground-facing surfaces of the device are key
factors to consider.
• Voltage handling to 200V
• Typical GaN application
requires x2 rated voltage
• X7R (-55°C to +125°C)
BORDER CAP ®:
V-SERIES:
Frequency range up to 80GHz
Frequency range up to 40GHz
0.02pF to 2.4nF
1nF to 10nF
Up to 100V
Up to 200V
Superior Microwave Performance
Wire Bond Optimized
Request a
sample kit to
get your project
off the ground.
www.knowlescapacitors.com
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