Automatic gain control circuitry and filter专利检索-LC滤波器信号处理专利检索查询-专利查询网

Automatic gain control circuitry and filter

阅读：361发布：2022-11-19

专利汇可以提供Automatic gain control circuitry and filter专利检索，专利查询，专利分析的服务。并且Circuitry for filtering and amplifying automatic gain control (AGC) pilot signals from a broadband signal is disclosed. Filters, each including a tapped winding with a series LC circuit connected to the tap, are tuned to the center frequencies of the pilot signals. The pilot signals are amplified, filtered again, and detected for use as AGC signals for a broadband amplifier.，下面是Automatic gain control circuitry and filter专利的具体信息内容。

权利要求

1. In a broadband signal amplifier system having automatic gain control circuitry for automatically controllng the gain of an amplifier for amplifying a signal containing at least two frequency separated pilot signals, improved automatic gain control circuitry comprising: a first filter having a passband including the frequency of a first one of said pilot signals; a second filter having a passband including the freuqency of a second one of said pilot signals; means connected to the output of said amplifier and to the input of each of said first and second filters for coupling at least a portion of the signal from said amplifier including at least said first and second ones of said pilot signals to said first and second filters; a second amplifier connected to the outputs of said first and second filters for amplifying at least said first and second ones of said pilot signals; a third filter connected to the output of said second amplifier and having a passband including the frequency of said first one of said pilot signals; a fourth filter connected to the output of said second amplifier and having a passband including the frequency of said second one of said pilot signals; and means connected between the outputs of said third and fourth filters and said first-named amplifier for developing at least first and second control signals from said first and second ones of said pilot signals for controlling the gain of said first-named amplifier.

2. Improved automatic gain control circuitry as defined in claim 1 wherein said first, second, third, and fourth filters each include a tapped winding connected between an input terminal and an output terminal, and a capacitor and an inductor connected in series between the tap of said winding and a reference terminal.

3. Improved automatic gain control circuitry as defined in claim 2 wherein each of said first, second, third, and fourth filters includes a ferrite core associated with said tapped winding.

4. Improved automatic gain control circuitry as defined in claim 3 wherein each of said first, second, third, and fourth filters includes a variable capacitor connected in parallel with said inductor for tuning the center frequency of the passband of the associated filter.

5. Improved automatic gain control circuitry as defined in claim 3 wherein at least said third and fourth filters include a second capacitor connected in parallel with said tapped winding to compensate for signal leakage through said tapped winding.

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