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Data Sheets
Description
The HMMC-5200 is a DC to 20 GHz, 9.5 dB gain, feedback amplifier designed to be used as a cascadable gain block for a variety of applications. The device consists of a modified Darlington feedback pair which reduces the sensitivity to process variations and provides 50 ohm input/output port matches. Furthermore, this amplifier is fabricated using WPTC’s Heterojunction Bipolar Transistor (HBT) process which provides excellent process uniformity, reliability and 1/f noise performance. The device requires a single positive supply voltage and generally operates Class-A for good distortion performance.
Applications
The HMMC-5200 can be used for a variety of applications requiring moderate amounts of gain and low power dissipation in a 50 Ωsystem.
Biasing and Operation
The HMMC-5200 can be operated from a single positive supply. This supply must be connected to two points on the chip, namely the VCC pad and the output pad. The supply voltage may be directly connected to the VCC pad as long as the voltage is between +4.75 to +7 volts; however, if the supply is higher than +7 volts, a series resistor (RCC) should be used to reduce the voltage to the VCC pad. See the bonding diagram for the equation used to select RCC. In the case of the output pad, the supply voltage must be connected to the output transmission line through a resistor and an inductor. The required value of the resistor is given by the equation:
Rout = 35.7 Vsupply – 114.3 Ω
where Vsupply is in volts. If Rout is greater than 300 Ω, the inductor may be omitted, however, the amplifier’s gain may be reduced by ~0.5 dB. Figure 4 shows a recommended bonding strategy.
The chip contains a backside via to provide a low inductance ground path; therefore, the ground pads on the IC should not be bonded.
The voltage at the IN and OUT pads of the IC will be approximately 3.2 volts; therefore, DC blocking caps should be used at these ports.
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