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US 8,941,438 B2Granted
Bandwidth limiting for amplifiers
AssigneeAnalog Devices, Inc.
InventorsRonald A. Kapusta, Youn-Jae Kook
Life of this patent
Estimating the term…
Abstract
An apparatus for limiting the bandwidth of an amplifier provides for the design of an input impedance, a feedback impedance, and a load impedance such that the load impedance is proportional to the sum of the input impedance and feedback impedance. A sampling circuit has a load impedance including a resistor and capacitor in series to reduce the effective amplifier transconductance, which decreases bandwidth without increasing noise density or making this circuit more difficult to drive than a conventional circuit.
Claims13
A circuit comprising:
- an amplifier including an input and an output;
- an input impedance coupled to the input of the amplifier;
- a feedback impedance coupled to the input of the amplifier and the output of the amplifier;
- and
- a load impedance, including a first resistor and a first capacitor, coupled to the output of the amplifier;
- wherein a ratio of the load impedance to a sum of the feedback impedance and the input impedance is at least substantially constant for all input frequencies.
3 more elements
A circuit comprising:
- an amplifier including an input and an output;
- an input impedance coupled to the input of the amplifier;
- a feedback impedance coupled to the input of the amplifier and the output of the amplifier;
- a load impedance, including a first resistor and a first capacitor connected in series, wherein the load impedance is coupled to the output of the amplifier;
- and
- a third capacitor connected in parallel with the first resistor of the load impedance;
- wherein a ratio of the load impedance to a sum of the feedback impedance and the input impedance is at least substantially constant for all input frequencies.
4 more elements
A circuit comprising:
- an amplifier including an input and an output;
- an input impedance coupled to the input of the amplifier;
- a feedback impedance coupled to the input of the amplifier and the output of the amplifier;
- and
- a load impedance, including a first resistor and a first capacitor, coupled to the output of the amplifier;
- a second switch connected in series with the second resistor of the feedback impedance;
- wherein the load impedance is less than a sum of the feedback impedance and the input impedance for all input frequencies.
4 more elements
Dependencies are inferred from the claim text.