Back to results
US 6,809,589 B2Granted
Low voltage large swing/high linearity analog buffer with servo amplifier and feedback loop
AssigneeEngim, Inc.
InventorGabriele Manganaro
Life of this patent
Estimating the term…
Abstract
An analog buffer with low harmonic distortion and low power supply voltage buffers a signal with wide voltage swing. The lower output voltage swing is increased, by adding a voltage level shifter to the feedback path of a servo. The upper output voltage swing is increased by coupling the output load to Vdd.
Claims27
An analog buffer comprising:
- a servo amplifier which receives an input signal at first input;
- a bipolar transistor at the output of the servo amplifier, the emitter of the bipolar transistor coupled through a feedback loop to a second input of the servo amplifier;
- a voltage level shifter coupled in the feedback loop;
- and
- a current source providing current to the voltage level shifter to cause a voltage shift at the emitter of the bipolar transistor to increase output voltage swing.
2 more elements
A method for buffering an input signal comprising:
- receiving an input signal at first input of a servo amplifier;
- coupling the emitter of a bipolar transistor through a feedback loop to a second input of the servo amplifier;
- coupling a diode in the feedback loop;
- and
- pushing current into the diode to cause a voltage shift at the emitter of the bipolar transistor to increase output voltage swing.
2 more elements
A analog buffer comprising:
- means for receiving an input signal at first input of a servo amplifier;
- means for coupling the emitter of a bipolar transistor through a feedback loop to a second input of the servo amplifier;
- means for coupling a diode in the feedback loop;
- and
- means for pushing current into the diode to cause a voltage shift at the emitter of the bipolar transistor to increase output voltage swing.
2 more elements
Dependencies are inferred from the claim text.