Description

​

• The CMT-BA1 is a cryogenic SiGe low noise amplifier ideal for Radio Astronomy and Low Frequency Physics applications. The CMT-BA1 is an upgrade from our LF1 amplifier. This amplifier covers the frequency range of 0.005 to 1.5 GHz. The typical noise temperature is less than 2.0 K from 5 to 500 MHz and less than 4.7 K up to 1.5 GHz. The gain of the amplifier is typically 32 dB with a gain flatness of +/- 1 dB.
   

• DC power is supplied from s single DC power source. Optimum performance is obtained with a supply voltage of 2.0 V. The supply current is 13 mA at this voltage. The supply voltage can be reduced to 1.5 V @ 6.5 mA for low power applications.
   

• 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.

​

Optional Input Bias Tee

​

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.

​

Optional Input Protection Diodes

​

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.