Common mode transient reduction circuit for improving transient response of an operational transconductance amplifier
AssigneeInternational Business Machines Corporation
InventorKevin B. Ohlson
Life of this patent
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Abstract
A common mode transient reduction circuit for use with an operational transconductance amplifier having a main amplifier and a common mode feedback amplifier coupled to a common bias voltage is disclosed. The common mode transient reduction circuit includes a delay circuit, coupled between the common bias voltage and the main amplifier, that reduces a magnitude of the main amplifier's common mode voltage output transient when the common bias voltage is changed. In an advantageous embodiment, the delay circuit includes a resistance and a capacitance.
Claims20
A common mode transient reduction circuit for use with a operational transconductance amplifier having a main amplifier and a common mode feedback amplifier coupled to a common bias voltage, comprising:
- a delay circuit, coupled between said common bias voltage and said main amplifier, that reduces a magnitude of said main amplifier's common mode voltage output transient when said common bias voltage is changed.
5.6 A method for decreasing a transition period of a transconductance continuous-time filter from a low frequency operation to a high frequency operation, wherein said transconductance continuous-time filter includes at least one operational transconductance amplifier having a main amplifier and a common mode feedback amplifier, comprising:
- utilizing a common bias voltage to bias said main and common mode feedback amplifiers;
- and
- introducing a delay between said common bias voltage and said main amplifier that reduces a magnitude of said main amplifier's common mode voltage output transient when said common bias voltage is changed thereby decreasing said transition period.
A transconductance continuous-time filter, comprising:
- a biasing circuit that provides a common bias voltage;
- and
- at least one operational transconductance amplifier coupled to said biasing circuit, said operational transconductance amplifier including:
- a main amplifier;
- a common mode feedback amplifier;
- and
- a delay circuit, coupled between said main amplifier and said biasing circuit, that reduces a magnitude of said main amplifier's common mode voltage output transient when said common bias voltage is changed.
A data storage system, comprising:
- a controller;
- a recording medium having a plurality of disk platters, wherein each of said plurality of disk platters having at least one magnetic surface;
- a plurality of transducer head assemblies, wherein each of said plurality of transducer head assemblies is associated with a corresponding magnetic surface of said plurality of disks;
- and
- a read/write channel, coupled to said plurality of transducer head assemblies, wherein said read/write channel includes a transconductance continuous-time filter circuit, said transconductance continuous-time filter circuit including:
- a biasing circuit that provides a common bias voltage;
- and
- at least one operational transconductance amplifier coupled to said biasing circuit, said operational transconductance amplifier comprising:
- a main amplifier;
- a common mode feedback amplifier;
- and
- a delay circuit, coupled between said main amplifier and said biasing circuit, that reduces a magnitude of said main amplifier's common mode voltage output transient when said common bias voltage is changed.
Dependencies are inferred from the claim text.