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US 10,447,220 B2Granted
Variable gain amplifier
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorsKathiravan Krishnamurthi, Gregory M. Flewelling
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Abstract
A variable gain amplifier circuit including a first amplifier, a second amplifier, and a variable capacitor connected in series between the first amplifier and the second amplifier is disclosed. As a gain of the variable gain amplifier circuit varies, the input impedance, output impedance, noise figure and third-order output intercept point (OIP3) of the variable gain amplifier circuit remain unchanged.
Claims17
A variable gain amplifier circuit comprising:
- a first amplifier;
- a second amplifier;
- a variable capacitor connected in series between the first amplifier and the second amplifier;
- a shunt feedback resistor;
- and
- an emitter degeneration resistor,
- wherein the shunt feedback resistor and the emitter degeneration resistor set at least one of an input impedance and a gain of the first amplifier.
4 more elements
A variable gain differential amplifier circuit comprising:
- a first amplifier connected to a first input terminal;
- a second amplifier connected to a first output terminal;
- a first voltage buffer amplifier connected between the first amplifier and the second amplifier;
- a third amplifier connected to a second input terminal;
- a fourth amplifier connected to a second output terminal;
- a second voltage buffer amplifier connected between the third amplifier and the fourth amplifier;
- a first variable capacitor connected in series between the first amplifier and the second amplifier;
- a second variable capacitor connected in series between the third amplifier and the fourth amplifier;
- a first mutually coupled tapped shunt peaking inductor;
- and
- a second mutually coupled tapped shunt peaking inductor;
- wherein the first shunt peaking inductor and the second shunt peaking inductor reject common mode signals.
9 more elements
Dependencies are inferred from the claim text.