Patent
Signal attenuator circuit for TV tuner
TLDR
In this article, an attenuator circuit coupling a signal input to a signal output network includes a series connected controllable impedance and amplifier stage connected to a source of AGC potential.Abstract:
In a tuner for a television receiver, an attenuator circuit coupling a signal input to a signal output network includes a series connected controllable impedance and amplifier stage connected to a source of AGC potential whereby increased signal strength causes an increased AGC potential which reduces current flow through and increases the impedance of the controllable impedance while reducing the gain, and consequently the noise, of the amplifier stage coupled to the signal output network. In another aspect of the invention, a second attenuator circuit includes a second controllable impedance series coupling a signal input to the attenuator circuit and a third controllable impedance coupling the junction of the first and second controllable impedances to circuit ground for effecting an additional increased attenuation of a received signal.read more
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References
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Patent
Broadband aperiodic attenuator apparatus
TL;DR: In this article, a broad band aperiodic attenuator using networks of nonlinear direct-current-energy controllable variable impedance elements with critical relationships between signal source and load to eliminate third order distortion effects and the like despite the presence of such nonlinear elements.
Patent
Input circuit for a television tuner
TL;DR: In this article, an AGC controlled PIN-diode attenuator between the aerial terminals and the first transistor is formed in such a manner that its output impedance deviates to an increasing extent from the transistor input impedance so that a considerable improvement of the signal-to-noise ratio is obtained.
Patent
Gain controlled high-frequency input stage having a pin-diode network
Backwinkel J,Greyer E +1 more
TL;DR: In this article, a PIN-diode network is connected with the d-c circuit of a pre-amplifier transistor in such a way that the reference voltage is stabilized by the transistor itself, derived from the emitter of the high-frequency, highcurrent transistor.