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US 2003/0112078 A1Published application
Dynamic matching in cascode circuits
AssigneeAnadigics, Inc.
InventorsHamid Reza Rategh, Payman Hosseinzadeh Shanjani, Ngar Loong Alan Chan, Mehdi Frederik Soltan
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Abstract
A method and apparatus for a variable gain cascode amplifier (or attenuator) is disclosed. Embodiments provide for a compensated input impedance. A gain/impedance controller compensates input impedance corresponding to gain adjustments.
Claims20
A method for improving an input match in a circuit comprising:
- operating a cascode having an input signal port with an input signal impedance and further having a stage gain controlled by a level setting gain control voltage;
- and
- operating an impedance compensating circuit for changing a compensating impedance presented at the input signal port,
- wherein the impedance compensating circuit is controlled by the level setting gain control voltage and wherein the impedance compensating circuit is operable to counteract changes in the input signal impedance correlated with changes in the stage gain.
1 more element
A circuit for processing a signal comprising:
- a cascode having
- a first transistor connected in a configuration selected from a group consisting of a common gate configuration and a common base configuration and
- a second transistor connected in a configuration selected from a group consisting of a common source configuration, a common drain configuration, a common emitter configuration and a common collector configuration;
- a gain controller operable to adjust a gain of the cascode in response to a control signal;
- and
- an impedance controller operable to adjust an input impedance of the cascode with a loading impedance in response to the control signal;
- whereby the circuit operates with input impedance compensation.
4 more elements
A circuit for processing a signal comprising:
- a cascode having
- a first transistor connected in a configuration selected from a group consisting of a common gate configuration and a common base configuration and
- a second transistor connected in a configuration selected from a group consisting of a common source configuration, a common drain configuration, a common emitter configuration and a common collector configuration;
- a controller operable to adjust a gain of the cascode in response to a control signal and further operable to adjust an input impedance of the cascode with a loading impedance in response to the control signal;
- whereby the circuit operates with input impedance compensation.
2 more elements
Dependencies are inferred from the claim text.