SCA-3

The SCA-3 is a high performance Gallium Arsenide Heterojunction Bipolar Transistor MMIC Amplifier.A Darlington configuration is utilized for broadband performance up to 5GHz.The heterojunction increases breakdown voltage and minimizes leakage current betweenjunctions. Cancellation of emitter junction non-linearities results in higher suppression of intermodulation products.Typical IP3 at 850 MHz with 65mA is 32.8 dBm.

Features of the SCA-3 are:(1)high output IP3: 32.8 dBm@850 MHz; (2)cascadable 50 Ohm gain block; (3)patented GaAs HBT technology; (4)operates from single supply.These unconditionally stable amplifiers provide 13.7 dB of gain and 17.3 dBm of 1dB compressed power and require only a single positive voltage supply. Only 2 DC-blocking capacitors, a bias resistor and an optional inductor are needed for operation. This MMIC is an ideal choice for wireless applications such as cellular, PCS, CDPD, wireless data and SONET.

The absolute maximum ratings of the SCA-3 can be summarized as:(1)supply current:120mA;(2)storage temperature range:-40 to 150;(3)operating junction temperature range:175;(4)maximum input power:16 dBm;(5)operating temperature:-40 to 85.RF output and bias pin. Bias should be supplied to this pin through an external series resistor and RF choke inductor. Because DC biasing is present on this pin, a DC blocking capacitor should be used in most applications (see application schematic). The supply side of the bias network should be well bypassed.While the SCA-3 can be operated at different bias currents, 65 mA is the recommended bias for lower junction temperature and longer life.  This reflects typical operating conditions which we have found to be an optimal balance between high IP3 and MTTF.In general, MTTF is improved to more than 100,000 hours when biasing at 65 mA and operating up to 850C ambient temperature.

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