Data Sheet HMC7543
Rev. A | Page 13 of 16
TYPICAL APPLICATION CIRCUIT
A typical application circuit for the HMC7543 is shown in
Figure 40. Combine supply lines as shown in the application
circuit schematic to minimize external component count and
simplify power supply routing (see Figure 40).
The HMC7543 uses several amplifier, detector, and attenuator
stages. All stages use depletion mode pHEMT transistors. It is
important to follow the following power-up bias sequence to
avoid transistor damage.
1. Apply a −2 V bias to the V
GG1
to V
GG4
pads.
2. Apply 4 V to the V
DD1
to V
DD4
pads.
3. Adjust V
GG1
to V
GG4
between −2 V and 0 V to achieve a
total amplifier drain current of 450 mA.
To power down the HMC7543, follow the reverse procedure.
For additional guidance on general bias sequencing, see the
MMIC Amplifier Biasing Procedure application note.
Figure 40. Typical Application Circuit
4
6
8
10
5
7
9
11
12
13
14
3
1
2
25
22
23
24
21
1819
20
1516
17
V
DD1
, V
DD2
, V
DD3
, V
DD4
V
GG1
, V
GG2
, V
GG3
, V
GG4
V
OUT
= V
REF
– V
DET
V
DD1
V
GG1
V
GG2
V
GG3
V
GG4
V
REF
V
DET
V
DD2
V
DD3
V
DD4
120pF
RFIN
RFIN RFOUT
RFOUT
120pF 120pF 120pF
4.7µF 0.01µF
120pF 120pF 120pF 120pF
+5V
+5V
–5V
4.7µF 0.01µF
100kΩ 100kΩ
10kΩ
10kΩ
SUGGESTED INTERFACE CIRCUIT
10kΩ
10kΩ
13423-040
