HMC7229CHIPS Datasheet, PDF (12/16 Pages) Analog Devices – Point to point radios

HMC7229CHIPS
Data Sheet
THEORY OF OPERATION
The HMC7229CHIPS is a GaAs, pHEMT, MMIC, 1 W power
amplifier consisting of four gain stages in series. Figure 34
shows a simplified functional block diagram of the
HMC7229CHIPS.
The input signal of the HMC7229CHIPS is evenly divided into
two paths and each path is amplified through the four independent
gain stages. The amplified signals are then combined at the RF
output.
The HMC7229CHIPS has single-ended input and output ports
with impedances nominally matched to 50 Ω internally over the
frequency range from 33 GHz to 40 GHz. Consequently, the
HMC7229CHIPS can be directly inserted into a 50 Ω system
with no impedance matching circuitry required.
Impedences nominally matched to a 50 Ω system also means
that multiple HMC7229CHIPS amplifiers can be cascaded back
to back without external matching circuitry.
Similarly, multiple HMC7229CHIPS can be used with power
dividers at the RF input and power combiners at the RF output
to obtain higher output power levels.
The input and output impedances are sufficiently stable compared
to the variations in temperature and supply voltage that no
impedance matching compensation is required.
It is critical to supply very low inductance ground connections
to the backside of the HMC7229CHIPS, ensuring stable
operation. Guidance on mounting the HMC7229CHIPS is given
in the Mounting and Bonding Techniques for Millimeter Wave
GaAs MMICs section.
To achieve the best performance from the HMC7229CHIPS
and not to damage the device, do not exceed the absolute
maximum ratings.
V_GG1
OR
V_GG2 ^VDD1
V_GG1
OR
V_GG2 ^VDD2
V_GG1
OR
V_GG2 ^VDD3
V_GG1
OR
V_GG2 ^VDD4
RFIN
RFOUT
V_GG1 V_DD5
OR
V_GG2
V_GG1 V_DD6
OR
V_GG2
V_GG1 V_DD7
OR
V_GG2
V_GG1 V_DD8
OR
V_GG2
Figure 34. Simplified Functional Block Diagram
Rev. 0 | Page 12 of 16