Product/Service

AMF Series - Temperature Compensated Amplifiers

Source: L3 Harris Technologies, Inc.
amf
Features:
  • Moderate to broadband to 50 GHz
  • Gain windows from as low as ±1 dB over -54 to +85°C

Features:
  • Moderate to broadband to 50 GHz
  • Gain windows from as low as ±1 dB over -54 to +85°C

Applications:

  • Military systems
  • Stringent environmental industrial applications
  • High performance commercial applications

For applications where normal amplifier gain variations as a function of temperature range exceed the allowable specification limits, MITEQ offers amplifier designs whose gain variations have been decreased by 2-3 times (in dB) over uncompensated designs. Since gain variations over temperature are not constant over the entire frequency range, MITEQ has adopted a gain window specification. Please reference the Specification Definitions section for a detailed description of this specification.

There are two techniques used for compensating for gain variations: Integrating a PIN diode attenuator and FET bias current compensation. In the first approach, the control current of a PIN diode attenuator is automatically decreased by means of a thermistor so that at high temperatures there is less attenuation. This compensates for the decreased gain due to an increase in ambient temperature. The attenuator is placed between the gain stages of the amplifier so that noise figure and output power performance are minimally degraded. In the second approach, the FET itself is compensated. In regions of low bias current, the FET gain is proportional to the current. The FET bias current is automatically increased by means of a thermistor at high temperatures to increase the gain, in order to compensate for a decrease in gain as a result of the increase in ambient temperature.

For specifications, outline drawings, and more, download the Product Catalog