Data Sheet HMC1132
Rev. 0 | Page 11 of 14
APPLICATIONS INFORMATION
The HMC1132 is a GaAs, pHEMT, MMIC power amplifier.
Capacitive bypassing is required for VDD1 and VDD2 as well as for
VGG (see Figure 33). Drain bias voltage must be applied to both
VDD1 and VDD2, and gate bias voltage must be applied to VGG.
Though the RFIN and RFOUT ports ac couple the signal, dc
paths to GND are provided to increase the ESD robustness of
the device. External dc blocking of RFIN and/or RFOUT is
desirable when appreciable levels of dc are expected to be
present.
All measurements for this device were taken using the typical
application circuit shown in Figure 33, configured as shown on
the evaluation printed circuit board (PCB).
The following is the recommended bias sequence during
power-up:
1. Connect the evaluation board to ground.
2. Set the gate bias voltage to −2 V.
3. Set the drain bias voltages to 6 V.
4. Increase the gate bias voltage to achieve a quiescent IDD =
600 mA.
5. Apply the RF signal.
The following is the recommended bias sequence during
power-down:
1. Turn off the RF signal.
2. Decrease the gate bias voltage to −2 V to achieve an IDD =
0 mA (approximately).
3. Decrease the drain bias voltages to 0 V.
4. Increase the gate bias voltage to 0 V.
The VDD = 6 V and IDD = 600 mA bias conditions are the
operating points recommended to optimize the overall
performance of the device. Unless otherwise noted, the data
shown was obtained using the recommended bias condition.
Operation of the HMC1132 at different bias conditions may
provide performance that differs from what is shown in the
Typical Performance Characteristics section. Biasing the
HMC1132 for higher drain current typically results in higher
P1dB, PSAT, and gain, though at the expense of increased power
consumption.
APPLICATION CIRCUIT
C23
4.7µF
V
DD1
V
GG
J1
RFIN J2
RFOUT
V
DD2
C13
10nF C3
100pF
C25
4.7µF C15
10nF C5
100pF
C30
4.7µF C20
10nF C10
100pF
17
1
3
4
2
9
5
6
7
818
19
20
21
22
23
24
12
11
10
13
14
15
16 25
26
27
28
29
30
31
32
HMC1132
13528-032
Figure 33. Typical Application Circuit