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US 4,063,187 AGranted
Equalizer circuit
AssigneeGTE Automatic Electric Laboratories Incorporated
InventorHenry John Orchard
Life of this patent
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Abstract
A Bode equalizer which has as one active element thereof a high-gain, differential-input amplifier and which has as a second active element a variable negative resistance, the equalizer circuit being controlled by a resistance arrangement which effectively comprises a series-connected, fixed resistor and the variable negative resistance.
Claims11
An active minimum-phase equalizer, which provides the special characteristics of a passive Bode equalizer circuit, said equalizer having input and output terminals and a common reference comprising:
- a differential input operational amplifier having an output connected to said output terminal, and having first and second inputs;
- a first impedance Z.sub.1 connected between said input terminal and said amplifier first input;
- a first resistor R.sub.1 connected between said input terminal and said amplifier second input, and a second resistor R.sub.2 connected between said amplifier output and said amplifier second input;
- and
- a fixed resistance and a variable negative resistance connected in series between said amplifier first input and said common reference.
2 more elements
Dependencies are inferred from the claim text.