Transconductor system for a power supply system
AssigneeTexas Instruments Incorporated
InventorRyan Erik Lind
Life of this patent
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Abstract
One example includes a transconductor system. The system includes a first transconductance amplifier that generates a control current in response to a first input voltage. The system also includes a second transconductance amplifier that generates an output signal in response to a second input voltage. The system further includes an intermediate amplifier that generates a control voltage in response to the control current and a third input voltage. The control voltage can be provided to the first and second transconductance amplifiers to set a transconductance of each of the first and second transconductance amplifiers to be approximately equal.
Claims34
A power supply circuit comprising:
- a first transconductance amplifier configured to generate a control current amplified from a first voltage and based on a first transconductance;
- a second transconductance amplifier configured to generate an output signal amplified from a second voltage and based on a second transconductance;
- an intermediate amplifier configured to generate a control voltage based on the control current and a third voltage, the control voltage is received by the first and second transconductance amplifiers to equalize the first transconductance and the second transconductance;
- and
- a buck converter having a voltage input terminal configured to receive the output signal, and a voltage output terminal configured to provide the first voltage.
A power supply circuit comprising:
- a first transconductance amplifier configured to generate a control current amplified from an output voltage and based on a first transconductance;
- a second transconductance amplifier configured to generate a regulation signal amplified from a sensed voltage proportional to an input current and based on a second transconductance;
- an intermediate amplifier configured to generate a control voltage based on the control current and an input voltage;
- and
- a buck converter having a voltage input terminal configured to receive the regulation signal, and a voltage output terminal configured to provide the output voltage,
- in which the first and second transconductance amplifiers are configured to adjust the first and second transconductance based on the control voltage.
A power supply circuit comprising:
- a first transconductance amplifier having a first controlled current source configured to adjust a first transconductance based on a control voltage, the first transconductance amplifier configured to generate a control current by amplifying an output voltage with the first transconductance;
- a second transconductance amplifier having a second controlled current source configured to adjust a second transconductance based on the control voltage, the second transconductance amplifier configured to generate a regulation signal by amplifying a sensed voltage proportional to an input current with the second transconductance;
- an intermediate amplifier configured to generate the control voltage based on the control current and an input voltage;
- and
- a buck converter having a voltage input terminal configured to receive the regulation signal, and a voltage output terminal configured to provide the output voltage.
A power supply circuit having a high voltage rail and a low voltage rail, comprising:
- a direct current voltage input;
- converter circuitry having a regulated voltage input and a voltage output;
- and
- a transconductor circuit including:
- a first transconductance amplifier having an input coupled to the voltage output, having a first control voltage input and having a control current output, the first transconductance amplifier having a first transconductance;
- a second transconductance amplifier having a reference voltage input, having a current monitor voltage input coupled to the direct current voltage input, having a second control voltage input, and having a regulated voltage output coupled to the regulated voltage input, the second transconductance amplifier having a second transconductance;
- and
- an intermediate amplifier having an input coupled to the direct current voltage input, having an input coupled to the control current output, and having a control voltage output coupled to the first control voltage input and the second control voltage input.
Dependencies are inferred from the claim text.