Cosmic Microwave Technology, Inc.

Description

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• The CMTBA1S, a single stage SiGe low noise amplifier, is intended for extremely low noise cryogenic applications where lower gain and lower power dissipation is required. The amplifier uses resistive feedback to achieve good input match (S11) and high gain stability. Typlical input return loss is -20 dB. The amplifier is optimum for the frequency range of 0.005 GHz to 1.0 GHz.  The amplifier has good noise performance up to 3 GHz

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• It is powered from a single positive DC power supply which is optimum at 3.0 V.

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• The amplifier is available in a miniature configuration, with or without integrated resistive bias tees.

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Optional Input Bias Tee

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As an option, the amplifier can be supplied with a DC bias tee for an external device connected to the amplifier input. The bias tee is formed by two (2) resistors connected to the input; as shown in Figure 1. One (1) resistor can be used as a source of current and the other senses the voltage across the external device. Voltages applied to the bias tee have a small effect on amplifier operation. At 12 K, 20 KΩ resistors increase noise by 0.5 K.

 

To order an amplifier with internal bias resistors, add the resistance to the part #. For instance, CMT-BA1-20K.

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Optional Input Protection Diodes

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As an option, the amplifier can be supplied with ESD protection & voltage spike protection at the RF input to the amplifier. There will be a slight degradation of the amplifier performance. Please note that the optional input protection diodes cannot be used if DC voltages are applied to the RF line using input bias tees.

 

To order an amplifier with internal bias resistors, add the resistance to the part #. For instance, CMT-BA1-12D-PD.