Patent
Circuit for automatically switching operating modes of feedback-controlled systems
TLDR
In this paper, an automatic switching control circuit (ASCCC) is proposed to change the operating modes of a feedback-controlled system such as automatic frequency control circuit, and includes a first impedance element, an inverting amplifier and a second impedance element in a series circuit between an input terminal to which an error signal from the feedback controlled signal is applied and an output terminal from which a compensation signal is applying to a modulating element of the feedback control system.Abstract:
An automatic switching control circuit is responsive to a command signal as derived from manual tuning operation to change the operating modes of a feedback-controlled system such as automatic frequency control circuit, and includes a first impedance element, an inverting amplifier and a second impedance element in a series circuit between an input terminal to which an error signal from the feedback-controlled signal is applied and an output terminal from which a compensation signal is applied to a modulating element of the feedback-controlled system. A third impedance element is connected between the output terminal and a reference terminal. A switch is provided to establish a short circuit path between the input of the inverting amplifier and the output terminal. The voltage across the third impedance element automatically reduces to substantially zero voltage level in response to the presence of the short circuit path so that the feedback control is suspended. The voltage across the second impedance may be utilized to indicate the signal level of the error signal during the open and closed loop control modes.read more
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References
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Patent
Electronic automatic frequency tuning system
Fred W. Caspari,Wayne C. Johnson +1 more
TL;DR: In this article, the frequency of an output signal of the local oscillator is electronically varied across a frequency region which includes the preselected frequency, and a change in the oscillator signal frequency is corrected by means of an automatic frequency control feedback loop containing a discriminator circuit.
Patent
AFT summing circuit for varactor-type tuning systems
TL;DR: In this article, an AFT summing circuit for a varactor-type tuning system and in particular for such a tuning system including a UHF tuner and a VHF Tuner is disclosed.