Abstract: A broadband amplifier has a microcontroller having tables the entries of which correspond to desired variable slope and gain characteristics of the amplifier. The entries in the tables are derived from known temperature characteristics of a specific amplifier/cable combination; multiple tables are used to support multiple different configurations. The microcontroller retrieves values from the tables based on temperature data supplied thereto via a serial bus; these values are output to digital-to-analog converters which generate slope and gain control signals to control slope and gain compensation circuits in a PIN diode attenuator in the amplifier.

Abstract: The disclosure relates to improved filter networks for use in the microwave region employing TTL logic and capable of changing a network from a "bandpass state" to an "all-stop state", or an "all pass state", or from a "low-pass state" to an "all pass state". Provision is also made for the increase or decrease in the selectivity of a low-pass filter.