The CITLF2, a SiGe low noise amplifier, is intended for extremely low noise cryogenic applications. The amplifier uses resistive feedback to achieve good input match (S11) and high gain stability. The amplifier is optimum for the frequency range of 0.01 GHz to 1.5 GHz. High gain and low noise is also achieved up to 5 GHz.
It is powered from a single positive DC power supply which is optimum at 2.0 V, but can be reduced to as low as 1.1 V for low power dissipation. Application of up to 5 V will not damage the amplifier. It is recommended that the power supply for the amplifier to be current limited to 100 mA.
The standard chassis is 27.1 X 15.9 X 8.7 mm excluding connectors. The amplifier is also available in our NEW miniature version which is 21.3 X 10.4 X 8.5 mm without bias tees and 23.0 X 13.2 X 8.5 mm with bias tees.
CMT is also producing a Quad amp version which contains four independent amplifiers in a single package with the size of 25.3 X 32.2 X 8.3 mm.

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. 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, CITLF2-20K.

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.

New! Miniaturized and Multi-Channel

Cosmic Microwave Technology, Inc.